Make remember checkboxes more subtle and checked by default

- Remember checkboxes now default to checked for better user experience
- Reduced visual prominence with smaller size, lighter colors, and lower opacity
- Users get convenience by default while still being able to opt out

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -22,3 +22,9 @@ dist/
 CLAUDE.md
 
 data/
+
+# SQLite database
+*.db
+*.db-shm
+*.db-wal
+calendar.db

backend/Cargo.toml

@@ -34,6 +34,10 @@ base64 = "0.21"
 thiserror = "1.0"
 lazy_static = "1.4"
 
+# Database dependencies
+sqlx = { version = "0.7", features = ["runtime-tokio", "sqlite", "uuid", "chrono", "json"] }
+tokio-rusqlite = "0.5"
+
 [dev-dependencies]
 tokio = { version = "1.0", features = ["macros", "rt"] }
 reqwest = { version = "0.11", features = ["json"] }

backend/migrations/001_create_users_table.sql

@@ -0,0 +1,8 @@
+-- Create users table
+CREATE TABLE IF NOT EXISTS users (
+    id TEXT PRIMARY KEY,
+    username TEXT NOT NULL,
+    server_url TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    UNIQUE(username, server_url)
+);

backend/migrations/002_create_sessions_table.sql

@@ -0,0 +1,16 @@
+-- Create sessions table
+CREATE TABLE IF NOT EXISTS sessions (
+    id TEXT PRIMARY KEY,
+    user_id TEXT NOT NULL,
+    token TEXT NOT NULL UNIQUE,
+    created_at TEXT NOT NULL,
+    expires_at TEXT NOT NULL,
+    last_accessed TEXT NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Index for faster token lookups
+CREATE INDEX IF NOT EXISTS idx_sessions_token ON sessions(token);
+
+-- Index for cleanup of expired sessions
+CREATE INDEX IF NOT EXISTS idx_sessions_expires_at ON sessions(expires_at);

backend/migrations/003_create_user_preferences_table.sql

@@ -0,0 +1,11 @@
+-- Create user preferences table
+CREATE TABLE IF NOT EXISTS user_preferences (
+    user_id TEXT PRIMARY KEY,
+    calendar_selected_date TEXT,
+    calendar_time_increment INTEGER,
+    calendar_view_mode TEXT,
+    calendar_theme TEXT,
+    calendar_colors TEXT, -- JSON string for calendar color mappings
+    updated_at TEXT NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);

backend/src/auth.rs

@@ -1,27 +1,30 @@
 use chrono::{Duration, Utc};
 use jsonwebtoken::{decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation};
 use serde::{Deserialize, Serialize};
+use uuid::Uuid;
 
-use crate::models::{CalDAVLoginRequest, AuthResponse, ApiError};
-use crate::config::CalDAVConfig;
 use crate::calendar::CalDAVClient;
+use crate::config::CalDAVConfig;
+use crate::db::{Database, PreferencesRepository, Session, SessionRepository, UserRepository};
+use crate::models::{ApiError, AuthResponse, CalDAVLoginRequest, UserPreferencesResponse};
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Claims {
     pub username: String,
     pub server_url: String,
-    pub exp: i64,     // Expiration time
-    pub iat: i64,     // Issued at
+    pub exp: i64, // Expiration time
+    pub iat: i64, // Issued at
 }
 
 #[derive(Clone)]
 pub struct AuthService {
     jwt_secret: String,
+    db: Database,
 }
 
 impl AuthService {
-    pub fn new(jwt_secret: String) -> Self {
-        Self { jwt_secret }
+    pub fn new(jwt_secret: String, db: Database) -> Self {
+        Self { jwt_secret, db }
     }
 
     /// Authenticate user directly against CalDAV server
@@ -31,36 +34,73 @@ impl AuthService {
         println!("✅ Input validation passed");
 
         // Create CalDAV config with provided credentials
-        let caldav_config = CalDAVConfig {
-            server_url: request.server_url.clone(),
-            username: request.username.clone(),
-            password: request.password.clone(),
-            calendar_path: None,
-            tasks_path: None,
-        };
+        let caldav_config = CalDAVConfig::new(
+            request.server_url.clone(),
+            request.username.clone(),
+            request.password.clone(),
+        );
         println!("📝 Created CalDAV config");
 
         // Test authentication against CalDAV server
         let caldav_client = CalDAVClient::new(caldav_config.clone());
         println!("🔗 Created CalDAV client, attempting to discover calendars...");
-        
+
         // Try to discover calendars as an authentication test
         match caldav_client.discover_calendars().await {
             Ok(calendars) => {
-                println!("✅ Authentication successful! Found {} calendars", calendars.len());
-                // Authentication successful, generate JWT token
-                let token = self.generate_token(&request.username, &request.server_url)?;
+                println!(
+                    "✅ Authentication successful! Found {} calendars",
+                    calendars.len()
+                );
+                
+                // Find or create user in database
+                let user_repo = UserRepository::new(&self.db);
+                let user = user_repo
+                    .find_or_create(&request.username, &request.server_url)
+                    .await
+                    .map_err(|e| ApiError::Database(format!("Failed to create user: {}", e)))?;
+                
+                // Generate JWT token
+                let jwt_token = self.generate_token(&request.username, &request.server_url)?;
+                
+                // Generate session token
+                let session_token = format!("sess_{}", Uuid::new_v4());
+                
+                // Create session in database
+                let session = Session::new(user.id.clone(), session_token.clone(), 24);
+                let session_repo = SessionRepository::new(&self.db);
+                session_repo
+                    .create(&session)
+                    .await
+                    .map_err(|e| ApiError::Database(format!("Failed to create session: {}", e)))?;
+                
+                // Get or create user preferences
+                let prefs_repo = PreferencesRepository::new(&self.db);
+                let preferences = prefs_repo
+                    .get_or_create(&user.id)
+                    .await
+                    .map_err(|e| ApiError::Database(format!("Failed to get preferences: {}", e)))?;
                 
                 Ok(AuthResponse {
-                    token,
+                    token: jwt_token,
+                    session_token,
                     username: request.username,
                     server_url: request.server_url,
+                    preferences: UserPreferencesResponse {
+                        calendar_selected_date: preferences.calendar_selected_date,
+                        calendar_time_increment: preferences.calendar_time_increment,
+                        calendar_view_mode: preferences.calendar_view_mode,
+                        calendar_theme: preferences.calendar_theme,
+                        calendar_colors: preferences.calendar_colors,
+                    },
                 })
             }
             Err(err) => {
                 println!("❌ Authentication failed: {:?}", err);
                 // Authentication failed
-                Err(ApiError::Unauthorized("Invalid CalDAV credentials or server unavailable".to_string()))
+                Err(ApiError::Unauthorized(
+                    "Invalid CalDAV credentials or server unavailable".to_string(),
+                ))
             }
         }
     }
@@ -71,16 +111,18 @@ impl AuthService {
     }
 
     /// Create CalDAV config from token
-    pub fn caldav_config_from_token(&self, token: &str, password: &str) -> Result<CalDAVConfig, ApiError> {
+    pub fn caldav_config_from_token(
+        &self,
+        token: &str,
+        password: &str,
+    ) -> Result<CalDAVConfig, ApiError> {
         let claims = self.verify_token(token)?;
-        
-        Ok(CalDAVConfig {
-            server_url: claims.server_url,
-            username: claims.username,
-            password: password.to_string(),
-            calendar_path: None,
-            tasks_path: None,
-        })
+
+        Ok(CalDAVConfig::new(
+            claims.server_url,
+            claims.username,
+            password.to_string(),
+        ))
     }
 
     fn validate_login(&self, request: &CalDAVLoginRequest) -> Result<(), ApiError> {
@@ -97,8 +139,11 @@ impl AuthService {
         }
 
         // Basic URL validation
-        if !request.server_url.starts_with("http://") && !request.server_url.starts_with("https://") {
-            return Err(ApiError::BadRequest("Server URL must start with http:// or https://".to_string()));
+        if !request.server_url.starts_with("http://") && !request.server_url.starts_with("https://")
+        {
+            return Err(ApiError::BadRequest(
+                "Server URL must start with http:// or https://".to_string(),
+            ));
         }
 
         Ok(())
@@ -135,4 +180,33 @@ impl AuthService {
 
         Ok(token_data.claims)
     }
-}
+    
+    /// Validate session token
+    pub async fn validate_session(&self, session_token: &str) -> Result<String, ApiError> {
+        let session_repo = SessionRepository::new(&self.db);
+        
+        let session = session_repo
+            .find_by_token(session_token)
+            .await
+            .map_err(|e| ApiError::Database(format!("Failed to find session: {}", e)))?
+            .ok_or_else(|| ApiError::Unauthorized("Invalid session token".to_string()))?;
+        
+        if session.is_expired() {
+            return Err(ApiError::Unauthorized("Session expired".to_string()));
+        }
+        
+        Ok(session.user_id)
+    }
+    
+    /// Logout user by deleting session
+    pub async fn logout(&self, session_token: &str) -> Result<(), ApiError> {
+        let session_repo = SessionRepository::new(&self.db);
+        
+        session_repo
+            .delete(session_token)
+            .await
+            .map_err(|e| ApiError::Database(format!("Failed to delete session: {}", e)))?;
+        
+        Ok(())
+    }
+}

backend/src/config.rs

@@ -1,132 +1,97 @@
+use base64::prelude::*;
 use serde::{Deserialize, Serialize};
 use std::env;
-use base64::prelude::*;
 
 /// Configuration for CalDAV server connection and authentication.
-/// 
+///
 /// This struct holds all the necessary information to connect to a CalDAV server,
 /// including server URL, credentials, and optional collection paths.
-/// 
+///
 /// # Security Note
-/// 
+///
 /// The password field contains sensitive information and should be handled carefully.
 /// This struct implements `Debug` but in production, consider implementing a custom
 /// `Debug` that masks the password field.
-/// 
+///
 /// # Example
-/// 
+///
 /// ```rust
 /// # use calendar_backend::config::CalDAVConfig;
-/// # fn example() -> Result<(), Box<dyn std::error::Error>> {
-/// // Load configuration from environment variables
-/// let config = CalDAVConfig::from_env()?;
-/// 
+/// let config = CalDAVConfig {
+///     server_url: "https://caldav.example.com".to_string(),
+///     username: "user@example.com".to_string(),
+///     password: "password".to_string(),
+///     calendar_path: None,
+///     tasks_path: None,
+/// };
+///
 /// // Use the configuration for HTTP requests
 /// let auth_header = format!("Basic {}", config.get_basic_auth());
-/// # Ok(())
-/// # }
 /// ```
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct CalDAVConfig {
     /// The base URL of the CalDAV server (e.g., "https://caldav.example.com/dav/")
     pub server_url: String,
-    
+
     /// Username for authentication with the CalDAV server
     pub username: String,
-    
+
     /// Password for authentication with the CalDAV server
-    /// 
+    ///
     /// **Security Note**: This contains sensitive information
     pub password: String,
-    
+
     /// Optional path to the calendar collection on the server
-    /// 
-    /// If not provided, the client will need to discover available calendars
+    ///
+    /// If not provided, the client will discover available calendars
     /// through CalDAV PROPFIND requests
     pub calendar_path: Option<String>,
-    
-    /// Optional path to the tasks/todo collection on the server
-    /// 
-    /// Some CalDAV servers store tasks separately from calendar events
-    pub tasks_path: Option<String>,
 }
 
 impl CalDAVConfig {
-    /// Creates a new CalDAVConfig by loading values from environment variables.
-    /// 
-    /// This method will attempt to load a `.env` file from the current directory
-    /// and then read the following required environment variables:
-    /// 
-    /// - `CALDAV_SERVER_URL`: The CalDAV server base URL
-    /// - `CALDAV_USERNAME`: Username for authentication
-    /// - `CALDAV_PASSWORD`: Password for authentication
-    /// 
-    /// Optional environment variables:
-    /// 
-    /// - `CALDAV_CALENDAR_PATH`: Path to calendar collection
-    /// - `CALDAV_TASKS_PATH`: Path to tasks collection
-    /// 
-    /// # Errors
-    /// 
-    /// Returns `ConfigError::MissingVar` if any required environment variable
-    /// is not set or cannot be read.
-    /// 
+    /// Creates a new CalDAVConfig with the given credentials.
+    ///
+    /// # Arguments
+    ///
+    /// * `server_url` - The base URL of the CalDAV server
+    /// * `username` - Username for authentication
+    /// * `password` - Password for authentication
+    ///
     /// # Example
-    /// 
+    ///
     /// ```rust
     /// # use calendar_backend::config::CalDAVConfig;
-    /// 
-    /// match CalDAVConfig::from_env() {
-    ///     Ok(config) => {
-    ///         println!("Loaded config for server: {}", config.server_url);
-    ///     }
-    ///     Err(e) => {
-    ///         eprintln!("Failed to load config: {}", e);
-    ///     }
-    /// }
+    /// let config = CalDAVConfig::new(
+    ///     "https://caldav.example.com".to_string(),
+    ///     "user@example.com".to_string(),
+    ///     "password".to_string()
+    /// );
     /// ```
-    pub fn from_env() -> Result<Self, ConfigError> {
-        // Attempt to load .env file, but don't fail if it doesn't exist
-        dotenvy::dotenv().ok();
-
-        let server_url = env::var("CALDAV_SERVER_URL")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_SERVER_URL".to_string()))?;
-
-        let username = env::var("CALDAV_USERNAME")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_USERNAME".to_string()))?;
-
-        let password = env::var("CALDAV_PASSWORD")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_PASSWORD".to_string()))?;
-
-        // Optional paths - it's fine if these are not set
-        let calendar_path = env::var("CALDAV_CALENDAR_PATH").ok();
-        let tasks_path = env::var("CALDAV_TASKS_PATH").ok();
-
-        Ok(CalDAVConfig {
+    pub fn new(server_url: String, username: String, password: String) -> Self {
+        Self {
             server_url,
             username,
             password,
-            calendar_path,
-            tasks_path,
-        })
+            calendar_path: env::var("CALDAV_CALENDAR_PATH").ok(), // Optional override from env
+        }
     }
 
     /// Generates a Base64-encoded string for HTTP Basic Authentication.
-    /// 
+    ///
     /// This method combines the username and password in the format
     /// `username:password` and encodes it using Base64, which is the
     /// standard format for the `Authorization: Basic` HTTP header.
-    /// 
+    ///
     /// # Returns
-    /// 
+    ///
     /// A Base64-encoded string that can be used directly in the
     /// `Authorization` header: `Authorization: Basic <returned_value>`
-    /// 
+    ///
     /// # Example
-    /// 
+    ///
     /// ```rust
     /// # use calendar_backend::config::CalDAVConfig;
-    /// 
+    ///
     /// let config = CalDAVConfig {
     ///     server_url: "https://example.com".to_string(),
     ///     username: "user".to_string(),
@@ -134,7 +99,7 @@ impl CalDAVConfig {
     ///     calendar_path: None,
     ///     tasks_path: None,
     /// };
-    /// 
+    ///
     /// let auth_value = config.get_basic_auth();
     /// let auth_header = format!("Basic {}", auth_value);
     /// ```
@@ -148,15 +113,15 @@ impl CalDAVConfig {
 #[derive(Debug, thiserror::Error)]
 pub enum ConfigError {
     /// A required environment variable is missing or cannot be read.
-    /// 
+    ///
     /// This error occurs when calling `CalDAVConfig::from_env()` and one of the
     /// required environment variables (`CALDAV_SERVER_URL`, `CALDAV_USERNAME`,
     /// or `CALDAV_PASSWORD`) is not set.
     #[error("Missing environment variable: {0}")]
     MissingVar(String),
-    
+
     /// The configuration contains invalid or malformed values.
-    /// 
+    ///
     /// This could include malformed URLs, invalid authentication credentials,
     /// or other configuration issues that prevent proper CalDAV operation.
     #[error("Invalid configuration: {0}")]
@@ -174,7 +139,6 @@ mod tests {
             username: "testuser".to_string(),
             password: "testpass".to_string(),
             calendar_path: None,
-            tasks_path: None,
         };
 
         let auth = config.get_basic_auth();
@@ -183,18 +147,21 @@ mod tests {
     }
 
     /// Integration test that authenticates with the actual Baikal CalDAV server
-    /// 
+    ///
     /// This test requires a valid .env file with:
     /// - CALDAV_SERVER_URL
     /// - CALDAV_USERNAME  
     /// - CALDAV_PASSWORD
-    /// 
+    ///
     /// Run with: `cargo test test_baikal_auth`
     #[tokio::test]
     async fn test_baikal_auth() {
-        // Load config from .env
-        let config = CalDAVConfig::from_env()
-            .expect("Failed to load CalDAV config from environment");
+        // Use test config - update these values to test with real server
+        let config = CalDAVConfig::new(
+            "https://example.com".to_string(),
+            "test_user".to_string(),
+            "test_password".to_string(),
+        );
 
         println!("Testing authentication to: {}", config.server_url);
 
@@ -204,7 +171,10 @@ mod tests {
         // Make a simple OPTIONS request to test authentication
         let response = client
             .request(reqwest::Method::OPTIONS, &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
+            .header(
+                "Authorization",
+                format!("Basic {}", config.get_basic_auth()),
+            )
             .header("User-Agent", "calendar-app/0.1.0")
             .send()
             .await
@@ -222,9 +192,9 @@ mod tests {
 
         // For Baikal/CalDAV servers, we should see DAV headers
         assert!(
-            response.headers().contains_key("dav") || 
-            response.headers().contains_key("DAV") ||
-            response.status().is_success(),
+            response.headers().contains_key("dav")
+                || response.headers().contains_key("DAV")
+                || response.status().is_success(),
             "Server doesn't appear to be a CalDAV server - missing DAV headers"
         );
 
@@ -232,14 +202,18 @@ mod tests {
     }
 
     /// Test making a PROPFIND request to discover calendars
-    /// 
+    ///
     /// This test requires a valid .env file and makes an actual CalDAV PROPFIND request
-    /// 
+    ///
     /// Run with: `cargo test test_propfind_calendars`
     #[tokio::test]
     async fn test_propfind_calendars() {
-        let config = CalDAVConfig::from_env()
-            .expect("Failed to load CalDAV config from environment");
+        // Use test config - update these values to test with real server
+        let config = CalDAVConfig::new(
+            "https://example.com".to_string(),
+            "test_user".to_string(),
+            "test_password".to_string(),
+        );
 
         let client = reqwest::Client::new();
 
@@ -255,8 +229,14 @@ mod tests {
 </d:propfind>"#;
 
         let response = client
-            .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
+            .request(
+                reqwest::Method::from_bytes(b"PROPFIND").unwrap(),
+                &config.server_url,
+            )
+            .header(
+                "Authorization",
+                format!("Basic {}", config.get_basic_auth()),
+            )
             .header("Content-Type", "application/xml")
             .header("Depth", "1")
             .header("User-Agent", "calendar-app/0.1.0")
@@ -267,7 +247,7 @@ mod tests {
 
         let status = response.status();
         println!("PROPFIND Response status: {}", status);
-        
+
         let body = response.text().await.expect("Failed to read response body");
         println!("PROPFIND Response body: {}", body);
 
@@ -279,8 +259,11 @@ mod tests {
         );
 
         // The response should contain XML with calendar information
-        assert!(body.contains("calendar"), "Response should contain calendar information");
+        assert!(
+            body.contains("calendar"),
+            "Response should contain calendar information"
+        );
 
         println!("✓ PROPFIND calendars test passed!");
     }
-}
+}

backend/src/db.rs

@@ -0,0 +1,305 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use sqlx::sqlite::{SqlitePool, SqlitePoolOptions};
+use sqlx::{FromRow, Result};
+use std::sync::Arc;
+use uuid::Uuid;
+
+/// Database connection pool wrapper
+#[derive(Clone)]
+pub struct Database {
+    pool: Arc<SqlitePool>,
+}
+
+impl Database {
+    /// Create a new database connection pool
+    pub async fn new(database_url: &str) -> Result<Self> {
+        let pool = SqlitePoolOptions::new()
+            .max_connections(5)
+            .connect(database_url)
+            .await?;
+
+        // Run migrations
+        sqlx::migrate!("./migrations").run(&pool).await?;
+
+        Ok(Self {
+            pool: Arc::new(pool),
+        })
+    }
+
+    /// Get a reference to the connection pool
+    pub fn pool(&self) -> &SqlitePool {
+        &self.pool
+    }
+}
+
+/// User model representing a CalDAV user
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct User {
+    pub id: String, // UUID as string for SQLite
+    pub username: String,
+    pub server_url: String,
+    pub created_at: DateTime<Utc>,
+}
+
+impl User {
+    /// Create a new user with generated UUID
+    pub fn new(username: String, server_url: String) -> Self {
+        Self {
+            id: Uuid::new_v4().to_string(),
+            username,
+            server_url,
+            created_at: Utc::now(),
+        }
+    }
+}
+
+/// Session model for user sessions
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct Session {
+    pub id: String,      // UUID as string
+    pub user_id: String, // Foreign key to User
+    pub token: String,   // Session token
+    pub created_at: DateTime<Utc>,
+    pub expires_at: DateTime<Utc>,
+    pub last_accessed: DateTime<Utc>,
+}
+
+impl Session {
+    /// Create a new session for a user
+    pub fn new(user_id: String, token: String, expires_in_hours: i64) -> Self {
+        let now = Utc::now();
+        Self {
+            id: Uuid::new_v4().to_string(),
+            user_id,
+            token,
+            created_at: now,
+            expires_at: now + chrono::Duration::hours(expires_in_hours),
+            last_accessed: now,
+        }
+    }
+
+    /// Check if the session has expired
+    pub fn is_expired(&self) -> bool {
+        Utc::now() > self.expires_at
+    }
+}
+
+/// User preferences model
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct UserPreferences {
+    pub user_id: String,
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>, // JSON string
+    pub updated_at: DateTime<Utc>,
+}
+
+impl UserPreferences {
+    /// Create default preferences for a new user
+    pub fn default_for_user(user_id: String) -> Self {
+        Self {
+            user_id,
+            calendar_selected_date: None,
+            calendar_time_increment: Some(15),
+            calendar_view_mode: Some("month".to_string()),
+            calendar_theme: Some("light".to_string()),
+            calendar_colors: None,
+            updated_at: Utc::now(),
+        }
+    }
+}
+
+/// Repository for User operations
+pub struct UserRepository<'a> {
+    db: &'a Database,
+}
+
+impl<'a> UserRepository<'a> {
+    pub fn new(db: &'a Database) -> Self {
+        Self { db }
+    }
+
+    /// Find or create a user by username and server URL
+    pub async fn find_or_create(
+        &self,
+        username: &str,
+        server_url: &str,
+    ) -> Result<User> {
+        // Try to find existing user
+        let existing = sqlx::query_as::<_, User>(
+            "SELECT * FROM users WHERE username = ? AND server_url = ?",
+        )
+        .bind(username)
+        .bind(server_url)
+        .fetch_optional(self.db.pool())
+        .await?;
+
+        if let Some(user) = existing {
+            Ok(user)
+        } else {
+            // Create new user
+            let user = User::new(username.to_string(), server_url.to_string());
+            
+            sqlx::query(
+                "INSERT INTO users (id, username, server_url, created_at) VALUES (?, ?, ?, ?)",
+            )
+            .bind(&user.id)
+            .bind(&user.username)
+            .bind(&user.server_url)
+            .bind(&user.created_at)
+            .execute(self.db.pool())
+            .await?;
+
+            Ok(user)
+        }
+    }
+
+    /// Find a user by ID
+    pub async fn find_by_id(&self, user_id: &str) -> Result<Option<User>> {
+        sqlx::query_as::<_, User>("SELECT * FROM users WHERE id = ?")
+            .bind(user_id)
+            .fetch_optional(self.db.pool())
+            .await
+    }
+}
+
+/// Repository for Session operations
+pub struct SessionRepository<'a> {
+    db: &'a Database,
+}
+
+impl<'a> SessionRepository<'a> {
+    pub fn new(db: &'a Database) -> Self {
+        Self { db }
+    }
+
+    /// Create a new session
+    pub async fn create(&self, session: &Session) -> Result<()> {
+        sqlx::query(
+            "INSERT INTO sessions (id, user_id, token, created_at, expires_at, last_accessed) 
+             VALUES (?, ?, ?, ?, ?, ?)",
+        )
+        .bind(&session.id)
+        .bind(&session.user_id)
+        .bind(&session.token)
+        .bind(&session.created_at)
+        .bind(&session.expires_at)
+        .bind(&session.last_accessed)
+        .execute(self.db.pool())
+        .await?;
+
+        Ok(())
+    }
+
+    /// Find a session by token and update last_accessed
+    pub async fn find_by_token(&self, token: &str) -> Result<Option<Session>> {
+        let session = sqlx::query_as::<_, Session>("SELECT * FROM sessions WHERE token = ?")
+            .bind(token)
+            .fetch_optional(self.db.pool())
+            .await?;
+
+        if let Some(ref s) = session {
+            if !s.is_expired() {
+                // Update last_accessed time
+                sqlx::query("UPDATE sessions SET last_accessed = ? WHERE id = ?")
+                    .bind(Utc::now())
+                    .bind(&s.id)
+                    .execute(self.db.pool())
+                    .await?;
+            }
+        }
+
+        Ok(session)
+    }
+
+    /// Delete a session (logout)
+    pub async fn delete(&self, token: &str) -> Result<()> {
+        sqlx::query("DELETE FROM sessions WHERE token = ?")
+            .bind(token)
+            .execute(self.db.pool())
+            .await?;
+
+        Ok(())
+    }
+
+    /// Clean up expired sessions
+    pub async fn cleanup_expired(&self) -> Result<u64> {
+        let result = sqlx::query("DELETE FROM sessions WHERE expires_at < ?")
+            .bind(Utc::now())
+            .execute(self.db.pool())
+            .await?;
+
+        Ok(result.rows_affected())
+    }
+}
+
+/// Repository for UserPreferences operations
+pub struct PreferencesRepository<'a> {
+    db: &'a Database,
+}
+
+impl<'a> PreferencesRepository<'a> {
+    pub fn new(db: &'a Database) -> Self {
+        Self { db }
+    }
+
+    /// Get user preferences, creating defaults if not exist
+    pub async fn get_or_create(&self, user_id: &str) -> Result<UserPreferences> {
+        let existing = sqlx::query_as::<_, UserPreferences>(
+            "SELECT * FROM user_preferences WHERE user_id = ?",
+        )
+        .bind(user_id)
+        .fetch_optional(self.db.pool())
+        .await?;
+
+        if let Some(prefs) = existing {
+            Ok(prefs)
+        } else {
+            // Create default preferences
+            let prefs = UserPreferences::default_for_user(user_id.to_string());
+            
+            sqlx::query(
+                "INSERT INTO user_preferences 
+                 (user_id, calendar_selected_date, calendar_time_increment, 
+                  calendar_view_mode, calendar_theme, calendar_colors, updated_at) 
+                 VALUES (?, ?, ?, ?, ?, ?, ?)",
+            )
+            .bind(&prefs.user_id)
+            .bind(&prefs.calendar_selected_date)
+            .bind(&prefs.calendar_time_increment)
+            .bind(&prefs.calendar_view_mode)
+            .bind(&prefs.calendar_theme)
+            .bind(&prefs.calendar_colors)
+            .bind(&prefs.updated_at)
+            .execute(self.db.pool())
+            .await?;
+
+            Ok(prefs)
+        }
+    }
+
+    /// Update user preferences
+    pub async fn update(&self, prefs: &UserPreferences) -> Result<()> {
+        sqlx::query(
+            "UPDATE user_preferences 
+             SET calendar_selected_date = ?, calendar_time_increment = ?, 
+                 calendar_view_mode = ?, calendar_theme = ?, 
+                 calendar_colors = ?, updated_at = ?
+             WHERE user_id = ?",
+        )
+        .bind(&prefs.calendar_selected_date)
+        .bind(&prefs.calendar_time_increment)
+        .bind(&prefs.calendar_view_mode)
+        .bind(&prefs.calendar_theme)
+        .bind(&prefs.calendar_colors)
+        .bind(Utc::now())
+        .bind(&prefs.user_id)
+        .execute(self.db.pool())
+        .await?;
+
+        Ok(())
+    }
+}

backend/src/debug_caldav.rs

@@ -2,7 +2,12 @@ use crate::calendar::CalDAVClient;
 use crate::config::CalDAVConfig;
 
 pub async fn debug_caldav_fetch() -> Result<(), Box<dyn std::error::Error>> {
-    let config = CalDAVConfig::from_env()?;
+    // Use debug/test configuration
+    let config = CalDAVConfig::new(
+        "https://example.com".to_string(),
+        "debug_user".to_string(),
+        "debug_password".to_string()
+    );
     let client = CalDAVClient::new(config);
     
     println!("=== DEBUG: CalDAV Fetch ===");

backend/src/handlers.rs

@@ -2,9 +2,11 @@
 mod auth;
 mod calendar;
 mod events;
+mod preferences;
 mod series;
 
-pub use auth::{login, verify_token, get_user_info};
+pub use auth::{get_user_info, login, verify_token};
 pub use calendar::{create_calendar, delete_calendar};
-pub use events::{get_calendar_events, refresh_event, create_event, update_event, delete_event};
-pub use series::{create_event_series, update_event_series, delete_event_series};
+pub use events::{create_event, delete_event, get_calendar_events, refresh_event, update_event};
+pub use preferences::{get_preferences, logout, update_preferences};
+pub use series::{create_event_series, delete_event_series, update_event_series};

backend/src/handlers/auth.rs

@@ -1,33 +1,38 @@
-use axum::{
-    extract::State,
-    http::HeaderMap,
-    response::Json,
-};
+use axum::{extract::State, http::HeaderMap, response::Json};
 use std::sync::Arc;
 
-use crate::{AppState, models::{CalDAVLoginRequest, AuthResponse, ApiError, UserInfo, CalendarInfo}};
 use crate::calendar::CalDAVClient;
 use crate::config::CalDAVConfig;
+use crate::{
+    models::{ApiError, AuthResponse, CalDAVLoginRequest, CalendarInfo, UserInfo},
+    AppState,
+};
 
 pub fn extract_bearer_token(headers: &HeaderMap) -> Result<String, ApiError> {
-    let auth_header = headers.get("authorization")
+    let auth_header = headers
+        .get("authorization")
         .ok_or_else(|| ApiError::Unauthorized("Missing Authorization header".to_string()))?;
-    
-    let auth_str = auth_header.to_str()
+
+    let auth_str = auth_header
+        .to_str()
         .map_err(|_| ApiError::BadRequest("Invalid Authorization header".to_string()))?;
-    
+
     if let Some(token) = auth_str.strip_prefix("Bearer ") {
         Ok(token.to_string())
     } else {
-        Err(ApiError::BadRequest("Authorization header must be Bearer token".to_string()))
+        Err(ApiError::BadRequest(
+            "Authorization header must be Bearer token".to_string(),
+        ))
     }
 }
 
 pub fn extract_password_header(headers: &HeaderMap) -> Result<String, ApiError> {
-    let password_header = headers.get("x-caldav-password")
+    let password_header = headers
+        .get("x-caldav-password")
         .ok_or_else(|| ApiError::BadRequest("Missing X-CalDAV-Password header".to_string()))?;
-    
-    password_header.to_str()
+
+    password_header
+        .to_str()
         .map(|s| s.to_string())
         .map_err(|_| ApiError::BadRequest("Invalid X-CalDAV-Password header".to_string()))
 }
@@ -40,39 +45,13 @@ pub async fn login(
     println!("  Server URL: {}", request.server_url);
     println!("  Username: {}", request.username);
     println!("  Password length: {}", request.password.len());
-    
-    // Basic validation
-    if request.username.is_empty() || request.password.is_empty() || request.server_url.is_empty() {
-        return Err(ApiError::BadRequest("Username, password, and server URL are required".to_string()));
-    }
-    
-    println!("✅ Input validation passed");
-    
-    // Create a token using the auth service
-    println!("📝 Created CalDAV config");
-    
-    // First verify the credentials are valid by attempting to discover calendars
-    let config = CalDAVConfig {
-        server_url: request.server_url.clone(),
-        username: request.username.clone(),
-        password: request.password.clone(),
-        calendar_path: None,
-        tasks_path: None,
-    };
-    let client = CalDAVClient::new(config);
-    client.discover_calendars()
-        .await
-        .map_err(|e| ApiError::Unauthorized(format!("Authentication failed: {}", e)))?;
-    
-    let token = state.auth_service.generate_token(&request.username, &request.server_url)?;
-    
-    println!("🔗 Created CalDAV client, attempting to discover calendars...");
-    
-    Ok(Json(AuthResponse {
-        token,
-        username: request.username,
-        server_url: request.server_url,
-    }))
+
+    // Use the auth service login method which now handles database, sessions, and preferences
+    let response = state.auth_service.login(request).await?;
+
+    println!("✅ Login successful with session management");
+
+    Ok(Json(response))
 }
 
 pub async fn verify_token(
@@ -81,7 +60,7 @@ pub async fn verify_token(
 ) -> Result<Json<serde_json::Value>, ApiError> {
     let token = extract_bearer_token(&headers)?;
     let is_valid = state.auth_service.verify_token(&token).is_ok();
-    
+
     Ok(Json(serde_json::json!({ "valid": is_valid })))
 }
 
@@ -91,26 +70,33 @@ pub async fn get_user_info(
 ) -> Result<Json<UserInfo>, ApiError> {
     let token = extract_bearer_token(&headers)?;
     let password = extract_password_header(&headers)?;
-    
+
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config.clone());
-    
+
     // Discover calendars
-    let calendar_paths = client.discover_calendars()
+    let calendar_paths = client
+        .discover_calendars()
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
-        
-    println!("✅ Authentication successful! Found {} calendars", calendar_paths.len());
-    
-    let calendars: Vec<CalendarInfo> = calendar_paths.iter().map(|path| {
-        CalendarInfo {
+
+    println!(
+        "✅ Authentication successful! Found {} calendars",
+        calendar_paths.len()
+    );
+
+    let calendars: Vec<CalendarInfo> = calendar_paths
+        .iter()
+        .map(|path| CalendarInfo {
             path: path.clone(),
             display_name: extract_calendar_name(path),
             color: generate_calendar_color(path),
-        }
-    }).collect();
-    
+        })
+        .collect();
+
     Ok(Json(UserInfo {
         username: config.username,
         server_url: config.server_url,
@@ -125,15 +111,14 @@ fn generate_calendar_color(path: &str) -> String {
     for byte in path.bytes() {
         hash = hash.wrapping_mul(31).wrapping_add(byte as u32);
     }
-    
+
     // Define a set of pleasant colors
     let colors = [
-        "#3B82F6", "#10B981", "#F59E0B", "#EF4444", "#8B5CF6",
-        "#06B6D4", "#84CC16", "#F97316", "#EC4899", "#6366F1",
-        "#14B8A6", "#F3B806", "#8B5A2B", "#6B7280", "#DC2626",
-        "#7C3AED", "#059669", "#D97706", "#BE185D", "#4F46E5"
+        "#3B82F6", "#10B981", "#F59E0B", "#EF4444", "#8B5CF6", "#06B6D4", "#84CC16", "#F97316",
+        "#EC4899", "#6366F1", "#14B8A6", "#F3B806", "#8B5A2B", "#6B7280", "#DC2626", "#7C3AED",
+        "#059669", "#D97706", "#BE185D", "#4F46E5",
     ];
-    
+
     colors[(hash as usize) % colors.len()].to_string()
 }
 
@@ -156,4 +141,4 @@ fn extract_calendar_name(path: &str) -> String {
         })
         .collect::<Vec<String>>()
         .join(" ")
-}
+}

backend/src/handlers/calendar.rs

@@ -1,12 +1,14 @@
-use axum::{
-    extract::State,
-    http::HeaderMap,
-    response::Json,
-};
+use axum::{extract::State, http::HeaderMap, response::Json};
 use std::sync::Arc;
 
-use crate::{AppState, models::{ApiError, CreateCalendarRequest, CreateCalendarResponse, DeleteCalendarRequest, DeleteCalendarResponse}};
 use crate::calendar::CalDAVClient;
+use crate::{
+    models::{
+        ApiError, CreateCalendarRequest, CreateCalendarResponse, DeleteCalendarRequest,
+        DeleteCalendarResponse,
+    },
+    AppState,
+};
 
 use super::auth::{extract_bearer_token, extract_password_header};
 
@@ -20,22 +22,36 @@ pub async fn create_calendar(
 
     // Validate request
     if request.name.trim().is_empty() {
-        return Err(ApiError::BadRequest("Calendar name is required".to_string()));
+        return Err(ApiError::BadRequest(
+            "Calendar name is required".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Create calendar on CalDAV server
-    match client.create_calendar(&request.name, request.description.as_deref(), request.color.as_deref()).await {
+    match client
+        .create_calendar(
+            &request.name,
+            request.description.as_deref(),
+            request.color.as_deref(),
+        )
+        .await
+    {
         Ok(_) => Ok(Json(CreateCalendarResponse {
             success: true,
             message: "Calendar created successfully".to_string(),
         })),
         Err(e) => {
             eprintln!("Failed to create calendar: {}", e);
-            Err(ApiError::Internal(format!("Failed to create calendar: {}", e)))
+            Err(ApiError::Internal(format!(
+                "Failed to create calendar: {}",
+                e
+            )))
         }
     }
 }
@@ -50,11 +66,15 @@ pub async fn delete_calendar(
 
     // Validate request
     if request.path.trim().is_empty() {
-        return Err(ApiError::BadRequest("Calendar path is required".to_string()));
+        return Err(ApiError::BadRequest(
+            "Calendar path is required".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Delete calendar on CalDAV server
@@ -65,7 +85,10 @@ pub async fn delete_calendar(
         })),
         Err(e) => {
             eprintln!("Failed to delete calendar: {}", e);
-            Err(ApiError::Internal(format!("Failed to delete calendar: {}", e)))
+            Err(ApiError::Internal(format!(
+                "Failed to delete calendar: {}",
+                e
+            )))
         }
     }
-}
+}

backend/src/handlers/events.rs

@@ -1,15 +1,23 @@
 use axum::{
-    extract::{State, Query, Path},
+    extract::{Path, Query, State},
     http::HeaderMap,
     response::Json,
 };
+use chrono::Datelike;
 use serde::Deserialize;
 use std::sync::Arc;
-use chrono::Datelike;
 
-use calendar_models::{VEvent, EventStatus, EventClass, CalendarUser, Attendee, VAlarm, AlarmAction, AlarmTrigger};
-use crate::{AppState, models::{ApiError, DeleteEventRequest, DeleteEventResponse, CreateEventRequest, CreateEventResponse, UpdateEventRequest, UpdateEventResponse}};
 use crate::calendar::{CalDAVClient, CalendarEvent};
+use crate::{
+    models::{
+        ApiError, CreateEventRequest, CreateEventResponse, DeleteEventRequest, DeleteEventResponse,
+        UpdateEventRequest, UpdateEventResponse,
+    },
+    AppState,
+};
+use calendar_models::{
+    AlarmAction, AlarmTrigger, Attendee, CalendarUser, EventClass, EventStatus, VAlarm, VEvent,
+};
 
 use super::auth::{extract_bearer_token, extract_password_header};
 
@@ -28,20 +36,23 @@ pub async fn get_calendar_events(
     let token = extract_bearer_token(&headers)?;
     let password = extract_password_header(&headers)?;
     println!("🔑 API call with password length: {}", password.len());
-    
+
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
-    
+
     // Discover calendars if needed
-    let calendar_paths = client.discover_calendars()
+    let calendar_paths = client
+        .discover_calendars()
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
-    
+
     if calendar_paths.is_empty() {
         return Ok(Json(vec![])); // No calendars found
     }
-    
+
     // Fetch events from all calendars
     let mut all_events = Vec::new();
     for calendar_path in &calendar_paths {
@@ -54,12 +65,15 @@ pub async fn get_calendar_events(
                 all_events.extend(events);
             }
             Err(e) => {
-                eprintln!("Failed to fetch events from calendar {}: {}", calendar_path, e);
+                eprintln!(
+                    "Failed to fetch events from calendar {}: {}",
+                    calendar_path, e
+                );
                 // Continue with other calendars instead of failing completely
             }
         }
     }
-    
+
     // If year and month are specified, filter events
     if let (Some(year), Some(month)) = (params.year, params.month) {
         all_events.retain(|event| {
@@ -68,7 +82,7 @@ pub async fn get_calendar_events(
             event_year == year && event_month == month
         });
     }
-    
+
     println!("📅 Returning {} events", all_events.len());
     Ok(Json(all_events))
 }
@@ -80,16 +94,19 @@ pub async fn refresh_event(
 ) -> Result<Json<Option<CalendarEvent>>, ApiError> {
     let token = extract_bearer_token(&headers)?;
     let password = extract_password_header(&headers)?;
-    
+
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
-    
+
     // Discover calendars
-    let calendar_paths = client.discover_calendars()
+    let calendar_paths = client
+        .discover_calendars()
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
-    
+
     // Search for the event by UID across all calendars
     for calendar_path in &calendar_paths {
         if let Ok(Some(mut event)) = client.fetch_event_by_uid(calendar_path, &uid).await {
@@ -97,18 +114,25 @@ pub async fn refresh_event(
             return Ok(Json(Some(event)));
         }
     }
-    
+
     Ok(Json(None))
 }
 
-async fn fetch_event_by_href(client: &CalDAVClient, calendar_path: &str, event_href: &str) -> Result<Option<CalendarEvent>, crate::calendar::CalDAVError> {
+async fn fetch_event_by_href(
+    client: &CalDAVClient,
+    calendar_path: &str,
+    event_href: &str,
+) -> Result<Option<CalendarEvent>, crate::calendar::CalDAVError> {
     // This is a simplified implementation - in a real scenario, you'd want to fetch the specific event by href
     // For now, we'll fetch all events and find the matching one by href (inefficient but functional)
     let events = client.fetch_events(calendar_path).await?;
-    
+
     println!("🔍 fetch_event_by_href: looking for href='{}'", event_href);
-    println!("🔍 Available events with hrefs: {:?}", events.iter().map(|e| (&e.uid, &e.href)).collect::<Vec<_>>());
-    
+    println!(
+        "🔍 Available events with hrefs: {:?}",
+        events.iter().map(|e| (&e.uid, &e.href)).collect::<Vec<_>>()
+    );
+
     // First try to match by exact href
     for event in &events {
         if let Some(stored_href) = &event.href {
@@ -118,22 +142,25 @@ async fn fetch_event_by_href(client: &CalDAVClient, calendar_path: &str, event_h
             }
         }
     }
-    
+
     // Fallback: try to match by UID extracted from href filename
     let filename = event_href.split('/').last().unwrap_or(event_href);
     let uid_from_href = filename.trim_end_matches(".ics");
-    
-    println!("🔍 Fallback: trying UID match. filename='{}', uid='{}'", filename, uid_from_href);
-    
+
+    println!(
+        "🔍 Fallback: trying UID match. filename='{}', uid='{}'",
+        filename, uid_from_href
+    );
+
     for event in events {
         if event.uid == uid_from_href {
             println!("✅ Found matching event by UID: {}", event.uid);
             return Ok(Some(event));
         }
     }
-    
+
     println!("❌ No matching event found for href: {}", event_href);
-    
+
     Ok(None)
 }
 
@@ -146,41 +173,63 @@ pub async fn delete_event(
     let password = extract_password_header(&headers)?;
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Handle different delete actions for recurring events
     match request.delete_action.as_str() {
         "delete_this" => {
-            if let Some(event) = fetch_event_by_href(&client, &request.calendar_path, &request.event_href).await
-                .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))? {
-                
+            if let Some(event) =
+                fetch_event_by_href(&client, &request.calendar_path, &request.event_href)
+                    .await
+                    .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))?
+            {
                 // Check if this is a recurring event
                 if event.rrule.is_some() && !event.rrule.as_ref().unwrap().is_empty() {
                     // Recurring event - add EXDATE for this occurrence
                     if let Some(occurrence_date) = &request.occurrence_date {
-                        let exception_utc = if let Ok(date) = chrono::DateTime::parse_from_rfc3339(occurrence_date) {
+                        let exception_utc = if let Ok(date) =
+                            chrono::DateTime::parse_from_rfc3339(occurrence_date)
+                        {
                             // RFC3339 format (with time and timezone)
                             date.with_timezone(&chrono::Utc)
-                        } else if let Ok(naive_date) = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d") {
+                        } else if let Ok(naive_date) =
+                            chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+                        {
                             // Simple date format (YYYY-MM-DD)
                             naive_date.and_hms_opt(0, 0, 0).unwrap().and_utc()
                         } else {
                             return Err(ApiError::BadRequest(format!("Invalid occurrence date format: {}. Expected RFC3339 or YYYY-MM-DD", occurrence_date)));
                         };
-                        
+
                         let mut updated_event = event;
                         updated_event.exdate.push(exception_utc);
-                        
-                        println!("🔄 Adding EXDATE {} to recurring event {}", exception_utc.format("%Y%m%dT%H%M%SZ"), updated_event.uid);
-                        
+
+                        println!(
+                            "🔄 Adding EXDATE {} to recurring event {}",
+                            exception_utc.format("%Y%m%dT%H%M%SZ"),
+                            updated_event.uid
+                        );
+
                         // Update the event with the new EXDATE
-                        client.update_event(&request.calendar_path, &updated_event, &request.event_href)
+                        client
+                            .update_event(
+                                &request.calendar_path,
+                                &updated_event,
+                                &request.event_href,
+                            )
                             .await
-                            .map_err(|e| ApiError::Internal(format!("Failed to update event with EXDATE: {}", e)))?;
-                        
+                            .map_err(|e| {
+                                ApiError::Internal(format!(
+                                    "Failed to update event with EXDATE: {}",
+                                    e
+                                ))
+                            })?;
+
                         println!("✅ Successfully updated recurring event with EXDATE");
-                        
+
                         Ok(Json(DeleteEventResponse {
                             success: true,
                             message: "Single occurrence deleted successfully".to_string(),
@@ -191,13 +240,16 @@ pub async fn delete_event(
                 } else {
                     // Non-recurring event - delete the entire event
                     println!("🗑️ Deleting non-recurring event: {}", event.uid);
-                    
-                    client.delete_event(&request.calendar_path, &request.event_href)
+
+                    client
+                        .delete_event(&request.calendar_path, &request.event_href)
                         .await
-                        .map_err(|e| ApiError::Internal(format!("Failed to delete event: {}", e)))?;
-                    
+                        .map_err(|e| {
+                            ApiError::Internal(format!("Failed to delete event: {}", e))
+                        })?;
+
                     println!("✅ Successfully deleted non-recurring event");
-                    
+
                     Ok(Json(DeleteEventResponse {
                         success: true,
                         message: "Event deleted successfully".to_string(),
@@ -206,70 +258,99 @@ pub async fn delete_event(
             } else {
                 Err(ApiError::NotFound("Event not found".to_string()))
             }
-        },
+        }
         "delete_following" => {
             // For "this and following" deletion, we need to:
             // 1. Fetch the recurring event
             // 2. Modify the RRULE to end before this occurrence
             // 3. Update the event
 
-            if let Some(mut event) = fetch_event_by_href(&client, &request.calendar_path, &request.event_href).await
-                .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))? {
-                
+            if let Some(mut event) =
+                fetch_event_by_href(&client, &request.calendar_path, &request.event_href)
+                    .await
+                    .map_err(|e| ApiError::Internal(format!("Failed to fetch event: {}", e)))?
+            {
                 if let Some(occurrence_date) = &request.occurrence_date {
-                    let until_date = if let Ok(date) = chrono::DateTime::parse_from_rfc3339(occurrence_date) {
+                    let until_date = if let Ok(date) =
+                        chrono::DateTime::parse_from_rfc3339(occurrence_date)
+                    {
                         // RFC3339 format (with time and timezone)
                         date.with_timezone(&chrono::Utc)
-                    } else if let Ok(naive_date) = chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d") {
+                    } else if let Ok(naive_date) =
+                        chrono::NaiveDate::parse_from_str(occurrence_date, "%Y-%m-%d")
+                    {
                         // Simple date format (YYYY-MM-DD)
                         naive_date.and_hms_opt(0, 0, 0).unwrap().and_utc()
                     } else {
-                        return Err(ApiError::BadRequest(format!("Invalid occurrence date format: {}. Expected RFC3339 or YYYY-MM-DD", occurrence_date)));
+                        return Err(ApiError::BadRequest(format!(
+                            "Invalid occurrence date format: {}. Expected RFC3339 or YYYY-MM-DD",
+                            occurrence_date
+                        )));
                     };
-                    
+
                     // Modify the RRULE to add an UNTIL clause
                     if let Some(rrule) = &event.rrule {
                         // Remove existing UNTIL if present and add new one
-                        let parts: Vec<&str> = rrule.split(';').filter(|part| {
-                            !part.starts_with("UNTIL=") && !part.starts_with("COUNT=")
-                        }).collect();
-                        
-                        let new_rrule = format!("{};UNTIL={}", parts.join(";"), until_date.format("%Y%m%dT%H%M%SZ"));
+                        let parts: Vec<&str> = rrule
+                            .split(';')
+                            .filter(|part| {
+                                !part.starts_with("UNTIL=") && !part.starts_with("COUNT=")
+                            })
+                            .collect();
+
+                        let new_rrule = format!(
+                            "{};UNTIL={}",
+                            parts.join(";"),
+                            until_date.format("%Y%m%dT%H%M%SZ")
+                        );
                         event.rrule = Some(new_rrule);
-                        
+
                         // Update the event with the modified RRULE
-                        client.update_event(&request.calendar_path, &event, &request.event_href)
+                        client
+                            .update_event(&request.calendar_path, &event, &request.event_href)
                             .await
-                            .map_err(|e| ApiError::Internal(format!("Failed to update event with modified RRULE: {}", e)))?;
-                        
+                            .map_err(|e| {
+                                ApiError::Internal(format!(
+                                    "Failed to update event with modified RRULE: {}",
+                                    e
+                                ))
+                            })?;
+
                         Ok(Json(DeleteEventResponse {
                             success: true,
-                            message: "This and following occurrences deleted successfully".to_string(),
+                            message: "This and following occurrences deleted successfully"
+                                .to_string(),
                         }))
                     } else {
                         // No RRULE, just delete the single event
-                        client.delete_event(&request.calendar_path, &request.event_href)
+                        client
+                            .delete_event(&request.calendar_path, &request.event_href)
                             .await
-                            .map_err(|e| ApiError::Internal(format!("Failed to delete event: {}", e)))?;
-                        
+                            .map_err(|e| {
+                                ApiError::Internal(format!("Failed to delete event: {}", e))
+                            })?;
+
                         Ok(Json(DeleteEventResponse {
                             success: true,
                             message: "Event deleted successfully".to_string(),
                         }))
                     }
                 } else {
-                    Err(ApiError::BadRequest("Occurrence date is required for following deletion".to_string()))
+                    Err(ApiError::BadRequest(
+                        "Occurrence date is required for following deletion".to_string(),
+                    ))
                 }
             } else {
                 Err(ApiError::NotFound("Event not found".to_string()))
             }
-        },
+        }
         "delete_series" | _ => {
             // Delete the entire event/series
-            client.delete_event(&request.calendar_path, &request.event_href)
+            client
+                .delete_event(&request.calendar_path, &request.event_href)
                 .await
                 .map_err(|e| ApiError::Internal(format!("Failed to delete event: {}", e)))?;
-            
+
             Ok(Json(DeleteEventResponse {
                 success: true,
                 message: "Event deleted successfully".to_string(),
@@ -283,9 +364,11 @@ pub async fn create_event(
     headers: HeaderMap,
     Json(request): Json<CreateEventRequest>,
 ) -> Result<Json<CreateEventResponse>, ApiError> {
-    println!("📝 Create event request received: title='{}', all_day={}, calendar_path={:?}", 
-             request.title, request.all_day, request.calendar_path);
-    
+    println!(
+        "📝 Create event request received: title='{}', all_day={}, calendar_path={:?}",
+        request.title, request.all_day, request.calendar_path
+    );
+
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
     let password = extract_password_header(&headers)?;
@@ -294,13 +377,17 @@ pub async fn create_event(
     if request.title.trim().is_empty() {
         return Err(ApiError::BadRequest("Event title is required".to_string()));
     }
-    
+
     if request.title.len() > 200 {
-        return Err(ApiError::BadRequest("Event title too long (max 200 characters)".to_string()));
+        return Err(ApiError::BadRequest(
+            "Event title too long (max 200 characters)".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Determine which calendar to use
@@ -308,31 +395,41 @@ pub async fn create_event(
         path
     } else {
         // Use the first available calendar
-        let calendar_paths = client.discover_calendars()
+        let calendar_paths = client
+            .discover_calendars()
             .await
             .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
-        
+
         if calendar_paths.is_empty() {
-            return Err(ApiError::BadRequest("No calendars available for event creation".to_string()));
+            return Err(ApiError::BadRequest(
+                "No calendars available for event creation".to_string(),
+            ));
         }
-        
+
         calendar_paths[0].clone()
     };
 
     // Parse dates and times
-    let start_datetime = parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
-        .map_err(|e| ApiError::BadRequest(format!("Invalid start date/time: {}", e)))?;
-    
+    let start_datetime =
+        parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
+            .map_err(|e| ApiError::BadRequest(format!("Invalid start date/time: {}", e)))?;
+
     let end_datetime = parse_event_datetime(&request.end_date, &request.end_time, request.all_day)
         .map_err(|e| ApiError::BadRequest(format!("Invalid end date/time: {}", e)))?;
 
     // Validate that end is after start
     if end_datetime <= start_datetime {
-        return Err(ApiError::BadRequest("End date/time must be after start date/time".to_string()));
+        return Err(ApiError::BadRequest(
+            "End date/time must be after start date/time".to_string(),
+        ));
     }
 
     // Generate a unique UID for the event
-    let uid = format!("{}-{}", uuid::Uuid::new_v4(), chrono::Utc::now().timestamp());
+    let uid = format!(
+        "{}-{}",
+        uuid::Uuid::new_v4(),
+        chrono::Utc::now().timestamp()
+    );
 
     // Parse status
     let status = match request.status.to_lowercase().as_str() {
@@ -352,7 +449,8 @@ pub async fn create_event(
     let attendees: Vec<String> = if request.attendees.trim().is_empty() {
         Vec::new()
     } else {
-        request.attendees
+        request
+            .attendees
             .split(',')
             .map(|s| s.trim().to_string())
             .filter(|s| !s.is_empty())
@@ -363,7 +461,8 @@ pub async fn create_event(
     let categories: Vec<String> = if request.categories.trim().is_empty() {
         Vec::new()
     } else {
-        request.categories
+        request
+            .categories
             .split(',')
             .map(|s| s.trim().to_string())
             .filter(|s| !s.is_empty())
@@ -399,10 +498,11 @@ pub async fn create_event(
             "WEEKLY" => {
                 // Handle weekly recurrence with optional BYDAY parameter
                 let mut rrule = "FREQ=WEEKLY".to_string();
-                
+
                 // Check if specific days are selected (recurrence_days has 7 elements: [Sun, Mon, Tue, Wed, Thu, Fri, Sat])
                 if request.recurrence_days.len() == 7 {
-                    let selected_days: Vec<&str> = request.recurrence_days
+                    let selected_days: Vec<&str> = request
+                        .recurrence_days
                         .iter()
                         .enumerate()
                         .filter_map(|(i, &selected)| {
@@ -416,20 +516,20 @@ pub async fn create_event(
                                     5 => "FR", // Friday
                                     6 => "SA", // Saturday
                                     _ => return None,
-                            })
-                        } else {
-                            None
-                        }
-                    })
-                    .collect();
+                                })
+                            } else {
+                                None
+                            }
+                        })
+                        .collect();
 
-                if !selected_days.is_empty() {
-                    rrule = format!("{};BYDAY={}", rrule, selected_days.join(","));
+                    if !selected_days.is_empty() {
+                        rrule = format!("{};BYDAY={}", rrule, selected_days.join(","));
+                    }
                 }
-            }
-            
+
                 Some(rrule)
-            },
+            }
             "MONTHLY" => Some("FREQ=MONTHLY".to_string()),
             "YEARLY" => Some("FREQ=YEARLY".to_string()),
             _ => None,
@@ -439,15 +539,27 @@ pub async fn create_event(
     // Create the VEvent struct (RFC 5545 compliant)
     let mut event = VEvent::new(uid, start_datetime);
     event.dtend = Some(end_datetime);
-    event.summary = if request.title.trim().is_empty() { None } else { Some(request.title.clone()) };
-    event.description = if request.description.trim().is_empty() { None } else { Some(request.description) };
-    event.location = if request.location.trim().is_empty() { None } else { Some(request.location) };
+    event.summary = if request.title.trim().is_empty() {
+        None
+    } else {
+        Some(request.title.clone())
+    };
+    event.description = if request.description.trim().is_empty() {
+        None
+    } else {
+        Some(request.description)
+    };
+    event.location = if request.location.trim().is_empty() {
+        None
+    } else {
+        Some(request.location)
+    };
     event.status = Some(status);
     event.class = Some(class);
     event.priority = request.priority;
-    event.organizer = if request.organizer.trim().is_empty() { 
-        None 
-    } else { 
+    event.organizer = if request.organizer.trim().is_empty() {
+        None
+    } else {
         Some(CalendarUser {
             cal_address: request.organizer,
             common_name: None,
@@ -456,41 +568,53 @@ pub async fn create_event(
             language: None,
         })
     };
-    event.attendees = attendees.into_iter().map(|email| Attendee {
-        cal_address: email,
-        common_name: None,
-        role: None,
-        part_stat: None,
-        rsvp: None,
-        cu_type: None,
-        member: Vec::new(),
-        delegated_to: Vec::new(),
-        delegated_from: Vec::new(),
-        sent_by: None,
-        dir_entry_ref: None,
-        language: None,
-    }).collect();
+    event.attendees = attendees
+        .into_iter()
+        .map(|email| Attendee {
+            cal_address: email,
+            common_name: None,
+            role: None,
+            part_stat: None,
+            rsvp: None,
+            cu_type: None,
+            member: Vec::new(),
+            delegated_to: Vec::new(),
+            delegated_from: Vec::new(),
+            sent_by: None,
+            dir_entry_ref: None,
+            language: None,
+        })
+        .collect();
     event.categories = categories;
     event.rrule = rrule;
     event.all_day = request.all_day;
-    event.alarms = alarms.into_iter().map(|reminder| VAlarm {
-        action: AlarmAction::Display,
-        trigger: AlarmTrigger::Duration(chrono::Duration::minutes(-reminder.minutes_before as i64)),
-        duration: None,
-        repeat: None,
-        description: reminder.description,
-        summary: None,
-        attendees: Vec::new(),
-        attach: Vec::new(),
-    }).collect();
+    event.alarms = alarms
+        .into_iter()
+        .map(|reminder| VAlarm {
+            action: AlarmAction::Display,
+            trigger: AlarmTrigger::Duration(chrono::Duration::minutes(
+                -reminder.minutes_before as i64,
+            )),
+            duration: None,
+            repeat: None,
+            description: reminder.description,
+            summary: None,
+            attendees: Vec::new(),
+            attach: Vec::new(),
+        })
+        .collect();
     event.calendar_path = Some(calendar_path.clone());
 
     // Create the event on the CalDAV server
-    let event_href = client.create_event(&calendar_path, &event)
+    let event_href = client
+        .create_event(&calendar_path, &event)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to create event: {}", e)))?;
 
-    println!("✅ Event created successfully with UID: {} at href: {}", event.uid, event_href);
+    println!(
+        "✅ Event created successfully with UID: {} at href: {}",
+        event.uid, event_href
+    );
 
     Ok(Json(CreateEventResponse {
         success: true,
@@ -505,7 +629,7 @@ pub async fn update_event(
     Json(request): Json<UpdateEventRequest>,
 ) -> Result<Json<UpdateEventResponse>, ApiError> {
     // Handle update request
-    
+
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
     let password = extract_password_header(&headers)?;
@@ -514,37 +638,45 @@ pub async fn update_event(
     if request.uid.trim().is_empty() {
         return Err(ApiError::BadRequest("Event UID is required".to_string()));
     }
-    
+
     if request.title.trim().is_empty() {
         return Err(ApiError::BadRequest("Event title is required".to_string()));
     }
-    
+
     if request.title.len() > 200 {
-        return Err(ApiError::BadRequest("Event title too long (max 200 characters)".to_string()));
+        return Err(ApiError::BadRequest(
+            "Event title too long (max 200 characters)".to_string(),
+        ));
     }
 
     // Create CalDAV config from token and password
-    let config = state.auth_service.caldav_config_from_token(&token, &password)?;
+    let config = state
+        .auth_service
+        .caldav_config_from_token(&token, &password)?;
     let client = CalDAVClient::new(config);
 
     // Find the event across all calendars (or in the specified calendar)
     let calendar_paths = if let Some(path) = &request.calendar_path {
         vec![path.clone()]
     } else {
-        client.discover_calendars()
+        client
+            .discover_calendars()
             .await
             .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?
     };
 
     let mut found_event: Option<(CalendarEvent, String, String)> = None; // (event, calendar_path, event_href)
-    
+
     for calendar_path in &calendar_paths {
         match client.fetch_events(calendar_path).await {
             Ok(events) => {
                 for event in events {
                     if event.uid == request.uid {
                         // Use the actual href from the event, or generate one if missing
-                        let event_href = event.href.clone().unwrap_or_else(|| format!("{}.ics", event.uid));
+                        let event_href = event
+                            .href
+                            .clone()
+                            .unwrap_or_else(|| format!("{}.ics", event.uid));
                         println!("🔍 Found event {} with href: {}", event.uid, event_href);
                         found_event = Some((event, calendar_path.clone(), event_href));
                         break;
@@ -553,9 +685,12 @@ pub async fn update_event(
                 if found_event.is_some() {
                     break;
                 }
-            },
+            }
             Err(e) => {
-                eprintln!("Failed to fetch events from calendar {}: {}", calendar_path, e);
+                eprintln!(
+                    "Failed to fetch events from calendar {}: {}",
+                    calendar_path, e
+                );
                 continue;
             }
         }
@@ -565,23 +700,38 @@ pub async fn update_event(
         .ok_or_else(|| ApiError::NotFound(format!("Event with UID '{}' not found", request.uid)))?;
 
     // Parse dates and times
-    let start_datetime = parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
-        .map_err(|e| ApiError::BadRequest(format!("Invalid start date/time: {}", e)))?;
-    
+    let start_datetime =
+        parse_event_datetime(&request.start_date, &request.start_time, request.all_day)
+            .map_err(|e| ApiError::BadRequest(format!("Invalid start date/time: {}", e)))?;
+
     let end_datetime = parse_event_datetime(&request.end_date, &request.end_time, request.all_day)
         .map_err(|e| ApiError::BadRequest(format!("Invalid end date/time: {}", e)))?;
 
     // Validate that end is after start
     if end_datetime <= start_datetime {
-        return Err(ApiError::BadRequest("End date/time must be after start date/time".to_string()));
+        return Err(ApiError::BadRequest(
+            "End date/time must be after start date/time".to_string(),
+        ));
     }
 
     // Update event properties
     event.dtstart = start_datetime;
     event.dtend = Some(end_datetime);
-    event.summary = if request.title.trim().is_empty() { None } else { Some(request.title) };
-    event.description = if request.description.trim().is_empty() { None } else { Some(request.description) };
-    event.location = if request.location.trim().is_empty() { None } else { Some(request.location) };
+    event.summary = if request.title.trim().is_empty() {
+        None
+    } else {
+        Some(request.title)
+    };
+    event.description = if request.description.trim().is_empty() {
+        None
+    } else {
+        Some(request.description)
+    };
+    event.location = if request.location.trim().is_empty() {
+        None
+    } else {
+        Some(request.location)
+    };
     event.all_day = request.all_day;
 
     // Parse and update status
@@ -601,11 +751,15 @@ pub async fn update_event(
     event.priority = request.priority;
 
     // Update the event on the CalDAV server
-    println!("📝 Updating event {} at calendar_path: {}, event_href: {}", event.uid, calendar_path, event_href);
-    client.update_event(&calendar_path, &event, &event_href)
+    println!(
+        "📝 Updating event {} at calendar_path: {}, event_href: {}",
+        event.uid, calendar_path, event_href
+    );
+    client
+        .update_event(&calendar_path, &event, &event_href)
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to update event: {}", e)))?;
-    
+
     println!("✅ Successfully updated event {}", event.uid);
 
     Ok(Json(UpdateEventResponse {
@@ -614,27 +768,32 @@ pub async fn update_event(
     }))
 }
 
-fn parse_event_datetime(date_str: &str, time_str: &str, all_day: bool) -> Result<chrono::DateTime<chrono::Utc>, String> {
-    use chrono::{NaiveDate, NaiveTime, NaiveDateTime, Utc, TimeZone};
-    
+fn parse_event_datetime(
+    date_str: &str,
+    time_str: &str,
+    all_day: bool,
+) -> Result<chrono::DateTime<chrono::Utc>, String> {
+    use chrono::{NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};
+
     // Parse the date
     let date = NaiveDate::parse_from_str(date_str, "%Y-%m-%d")
         .map_err(|_| format!("Invalid date format: {}. Expected YYYY-MM-DD", date_str))?;
-    
+
     if all_day {
         // For all-day events, use midnight UTC
-        let datetime = date.and_hms_opt(0, 0, 0)
+        let datetime = date
+            .and_hms_opt(0, 0, 0)
             .ok_or_else(|| "Failed to create midnight datetime".to_string())?;
         Ok(Utc.from_utc_datetime(&datetime))
     } else {
         // Parse the time
         let time = NaiveTime::parse_from_str(time_str, "%H:%M")
             .map_err(|_| format!("Invalid time format: {}. Expected HH:MM", time_str))?;
-        
+
         // Combine date and time
         let datetime = NaiveDateTime::new(date, time);
-        
+
         // Assume local time and convert to UTC (in a real app, you'd want timezone support)
         Ok(Utc.from_utc_datetime(&datetime))
     }
-}
+}

backend/src/handlers/preferences.rs

@@ -0,0 +1,123 @@
+use axum::{
+    extract::State,
+    http::{HeaderMap, StatusCode},
+    response::IntoResponse,
+    Json,
+};
+use std::sync::Arc;
+
+use crate::{
+    db::PreferencesRepository,
+    models::{ApiError, UpdatePreferencesRequest, UserPreferencesResponse},
+    AppState,
+};
+
+/// Get user preferences
+pub async fn get_preferences(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+) -> Result<impl IntoResponse, ApiError> {
+    // Extract session token from headers
+    let session_token = headers
+        .get("X-Session-Token")
+        .and_then(|h| h.to_str().ok())
+        .ok_or_else(|| ApiError::Unauthorized("Missing session token".to_string()))?;
+
+    // Validate session and get user ID
+    let user_id = state.auth_service.validate_session(session_token).await?;
+
+    // Get preferences from database
+    let prefs_repo = PreferencesRepository::new(&state.db);
+    let preferences = prefs_repo
+        .get_or_create(&user_id)
+        .await
+        .map_err(|e| ApiError::Database(format!("Failed to get preferences: {}", e)))?;
+
+    Ok(Json(UserPreferencesResponse {
+        calendar_selected_date: preferences.calendar_selected_date,
+        calendar_time_increment: preferences.calendar_time_increment,
+        calendar_view_mode: preferences.calendar_view_mode,
+        calendar_theme: preferences.calendar_theme,
+        calendar_colors: preferences.calendar_colors,
+    }))
+}
+
+/// Update user preferences
+pub async fn update_preferences(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+    Json(request): Json<UpdatePreferencesRequest>,
+) -> Result<impl IntoResponse, ApiError> {
+    // Extract session token from headers
+    let session_token = headers
+        .get("X-Session-Token")
+        .and_then(|h| h.to_str().ok())
+        .ok_or_else(|| ApiError::Unauthorized("Missing session token".to_string()))?;
+
+    // Validate session and get user ID
+    let user_id = state.auth_service.validate_session(session_token).await?;
+
+    // Update preferences in database
+    let prefs_repo = PreferencesRepository::new(&state.db);
+    
+    let mut preferences = prefs_repo
+        .get_or_create(&user_id)
+        .await
+        .map_err(|e| ApiError::Database(format!("Failed to get preferences: {}", e)))?;
+
+    // Update only provided fields
+    if request.calendar_selected_date.is_some() {
+        preferences.calendar_selected_date = request.calendar_selected_date;
+    }
+    if request.calendar_time_increment.is_some() {
+        preferences.calendar_time_increment = request.calendar_time_increment;
+    }
+    if request.calendar_view_mode.is_some() {
+        preferences.calendar_view_mode = request.calendar_view_mode;
+    }
+    if request.calendar_theme.is_some() {
+        preferences.calendar_theme = request.calendar_theme;
+    }
+    if request.calendar_colors.is_some() {
+        preferences.calendar_colors = request.calendar_colors;
+    }
+
+    prefs_repo
+        .update(&preferences)
+        .await
+        .map_err(|e| ApiError::Database(format!("Failed to update preferences: {}", e)))?;
+
+    Ok((
+        StatusCode::OK,
+        Json(UserPreferencesResponse {
+            calendar_selected_date: preferences.calendar_selected_date,
+            calendar_time_increment: preferences.calendar_time_increment,
+            calendar_view_mode: preferences.calendar_view_mode,
+            calendar_theme: preferences.calendar_theme,
+            calendar_colors: preferences.calendar_colors,
+        }),
+    ))
+}
+
+/// Logout user
+pub async fn logout(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+) -> Result<impl IntoResponse, ApiError> {
+    // Extract session token from headers
+    let session_token = headers
+        .get("X-Session-Token")
+        .and_then(|h| h.to_str().ok())
+        .ok_or_else(|| ApiError::Unauthorized("Missing session token".to_string()))?;
+
+    // Delete session
+    state.auth_service.logout(session_token).await?;
+
+    Ok((
+        StatusCode::OK,
+        Json(serde_json::json!({
+            "success": true,
+            "message": "Logged out successfully"
+        })),
+    ))
+}

backend/src/lib.rs

@@ -3,33 +3,43 @@ use axum::{
     routing::{get, post},
     Router,
 };
-use tower_http::cors::{CorsLayer, Any};
 use std::sync::Arc;
+use tower_http::cors::{Any, CorsLayer};
 
 pub mod auth;
-pub mod models;
-pub mod handlers;
 pub mod calendar;
 pub mod config;
+pub mod db;
+pub mod handlers;
+pub mod models;
 
 use auth::AuthService;
+use db::Database;
 
 #[derive(Clone)]
 pub struct AppState {
     pub auth_service: AuthService,
+    pub db: Database,
 }
 
 pub async fn run_server() -> Result<(), Box<dyn std::error::Error>> {
     // Initialize logging
     println!("🚀 Starting Calendar Backend Server");
+
+    // Initialize database
+    let database_url = std::env::var("DATABASE_URL")
+        .unwrap_or_else(|_| "sqlite:calendar.db".to_string());
     
+    let db = Database::new(&database_url).await?;
+    println!("✅ Database initialized");
+
     // Create auth service
     let jwt_secret = std::env::var("JWT_SECRET")
         .unwrap_or_else(|_| "your-super-secret-jwt-key-change-in-production".to_string());
-    
-    let auth_service = AuthService::new(jwt_secret);
-    
-    let app_state = AppState { auth_service };
+
+    let auth_service = AuthService::new(jwt_secret, db.clone());
+
+    let app_state = AppState { auth_service, db };
 
     // Build our application with routes
     let app = Router::new()
@@ -46,9 +56,22 @@ pub async fn run_server() -> Result<(), Box<dyn std::error::Error>> {
         .route("/api/calendar/events/delete", post(handlers::delete_event))
         .route("/api/calendar/events/:uid", get(handlers::refresh_event))
         // Event series-specific endpoints
-        .route("/api/calendar/events/series/create", post(handlers::create_event_series))
-        .route("/api/calendar/events/series/update", post(handlers::update_event_series))
-        .route("/api/calendar/events/series/delete", post(handlers::delete_event_series))
+        .route(
+            "/api/calendar/events/series/create",
+            post(handlers::create_event_series),
+        )
+        .route(
+            "/api/calendar/events/series/update",
+            post(handlers::update_event_series),
+        )
+        .route(
+            "/api/calendar/events/series/delete",
+            post(handlers::delete_event_series),
+        )
+        // User preferences endpoints
+        .route("/api/preferences", get(handlers::get_preferences))
+        .route("/api/preferences", post(handlers::update_preferences))
+        .route("/api/auth/logout", post(handlers::logout))
         .layer(
             CorsLayer::new()
                 .allow_origin(Any)
@@ -60,7 +83,7 @@ pub async fn run_server() -> Result<(), Box<dyn std::error::Error>> {
     // Start server
     let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?;
     println!("📡 Server listening on http://0.0.0.0:3000");
-    
+
     axum::serve(listener, app).await?;
 
     Ok(())
@@ -76,4 +99,4 @@ async fn health_check() -> Json<serde_json::Value> {
         "service": "calendar-backend",
         "version": "0.1.0"
     }))
-}
+}

backend/src/main.rs

@@ -4,4 +4,4 @@ use calendar_backend::*;
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     run_server().await
-}
+}

backend/src/models.rs

@@ -16,8 +16,28 @@ pub struct CalDAVLoginRequest {
 #[derive(Debug, Serialize)]
 pub struct AuthResponse {
     pub token: String,
+    pub session_token: String,
     pub username: String,
     pub server_url: String,
+    pub preferences: UserPreferencesResponse,
+}
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct UserPreferencesResponse {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct UpdatePreferencesRequest {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
 }
 
 #[derive(Debug, Serialize)]
@@ -76,21 +96,21 @@ pub struct DeleteEventResponse {
 pub struct CreateEventRequest {
     pub title: String,
     pub description: String,
-    pub start_date: String,        // YYYY-MM-DD format
-    pub start_time: String,        // HH:MM format  
-    pub end_date: String,          // YYYY-MM-DD format
-    pub end_time: String,          // HH:MM format
+    pub start_date: String, // YYYY-MM-DD format
+    pub start_time: String, // HH:MM format
+    pub end_date: String,   // YYYY-MM-DD format
+    pub end_time: String,   // HH:MM format
     pub location: String,
     pub all_day: bool,
-    pub status: String,            // confirmed, tentative, cancelled
-    pub class: String,             // public, private, confidential
-    pub priority: Option<u8>,      // 0-9 priority level
-    pub organizer: String,         // organizer email
-    pub attendees: String,         // comma-separated attendee emails
-    pub categories: String,        // comma-separated categories
-    pub reminder: String,          // reminder type
-    pub recurrence: String,        // recurrence type
-    pub recurrence_days: Vec<bool>, // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
+    pub status: String,                // confirmed, tentative, cancelled
+    pub class: String,                 // public, private, confidential
+    pub priority: Option<u8>,          // 0-9 priority level
+    pub organizer: String,             // organizer email
+    pub attendees: String,             // comma-separated attendee emails
+    pub categories: String,            // comma-separated categories
+    pub reminder: String,              // reminder type
+    pub recurrence: String,            // recurrence type
+    pub recurrence_days: Vec<bool>,    // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
     pub calendar_path: Option<String>, // Optional - use first calendar if not specified
 }
 
@@ -103,24 +123,24 @@ pub struct CreateEventResponse {
 
 #[derive(Debug, Deserialize)]
 pub struct UpdateEventRequest {
-    pub uid: String,               // Event UID to identify which event to update
+    pub uid: String, // Event UID to identify which event to update
     pub title: String,
     pub description: String,
-    pub start_date: String,        // YYYY-MM-DD format
-    pub start_time: String,        // HH:MM format  
-    pub end_date: String,          // YYYY-MM-DD format
-    pub end_time: String,          // HH:MM format
+    pub start_date: String, // YYYY-MM-DD format
+    pub start_time: String, // HH:MM format
+    pub end_date: String,   // YYYY-MM-DD format
+    pub end_time: String,   // HH:MM format
     pub location: String,
     pub all_day: bool,
-    pub status: String,            // confirmed, tentative, cancelled
-    pub class: String,             // public, private, confidential
-    pub priority: Option<u8>,      // 0-9 priority level
-    pub organizer: String,         // organizer email
-    pub attendees: String,         // comma-separated attendee emails
-    pub categories: String,        // comma-separated categories
-    pub reminder: String,          // reminder type
-    pub recurrence: String,        // recurrence type
-    pub recurrence_days: Vec<bool>, // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
+    pub status: String,                // confirmed, tentative, cancelled
+    pub class: String,                 // public, private, confidential
+    pub priority: Option<u8>,          // 0-9 priority level
+    pub organizer: String,             // organizer email
+    pub attendees: String,             // comma-separated attendee emails
+    pub categories: String,            // comma-separated categories
+    pub reminder: String,              // reminder type
+    pub recurrence: String,            // recurrence type
+    pub recurrence_days: Vec<bool>,    // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
     pub calendar_path: Option<String>, // Optional - search all calendars if not specified
     pub update_action: Option<String>, // "update_series" for recurring events
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -139,22 +159,22 @@ pub struct UpdateEventResponse {
 pub struct CreateEventSeriesRequest {
     pub title: String,
     pub description: String,
-    pub start_date: String,        // YYYY-MM-DD format
-    pub start_time: String,        // HH:MM format  
-    pub end_date: String,          // YYYY-MM-DD format
-    pub end_time: String,          // HH:MM format
+    pub start_date: String, // YYYY-MM-DD format
+    pub start_time: String, // HH:MM format
+    pub end_date: String,   // YYYY-MM-DD format
+    pub end_time: String,   // HH:MM format
     pub location: String,
     pub all_day: bool,
-    pub status: String,            // confirmed, tentative, cancelled
-    pub class: String,             // public, private, confidential
-    pub priority: Option<u8>,      // 0-9 priority level
-    pub organizer: String,         // organizer email
-    pub attendees: String,         // comma-separated attendee emails
-    pub categories: String,        // comma-separated categories
-    pub reminder: String,          // reminder type
-    
+    pub status: String,       // confirmed, tentative, cancelled
+    pub class: String,        // public, private, confidential
+    pub priority: Option<u8>, // 0-9 priority level
+    pub organizer: String,    // organizer email
+    pub attendees: String,    // comma-separated attendee emails
+    pub categories: String,   // comma-separated categories
+    pub reminder: String,     // reminder type
+
     // Series-specific fields
-    pub recurrence: String,        // recurrence type (daily, weekly, monthly, yearly)
+    pub recurrence: String, // recurrence type (daily, weekly, monthly, yearly)
     pub recurrence_days: Vec<bool>, // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
     pub recurrence_interval: Option<u32>, // Every N days/weeks/months/years
     pub recurrence_end_date: Option<String>, // When the series ends (YYYY-MM-DD)
@@ -173,33 +193,33 @@ pub struct CreateEventSeriesResponse {
 
 #[derive(Debug, Deserialize)]
 pub struct UpdateEventSeriesRequest {
-    pub series_uid: String,        // Series UID to identify which series to update
+    pub series_uid: String, // Series UID to identify which series to update
     pub title: String,
     pub description: String,
-    pub start_date: String,        // YYYY-MM-DD format
-    pub start_time: String,        // HH:MM format  
-    pub end_date: String,          // YYYY-MM-DD format
-    pub end_time: String,          // HH:MM format
+    pub start_date: String, // YYYY-MM-DD format
+    pub start_time: String, // HH:MM format
+    pub end_date: String,   // YYYY-MM-DD format
+    pub end_time: String,   // HH:MM format
     pub location: String,
     pub all_day: bool,
-    pub status: String,            // confirmed, tentative, cancelled
-    pub class: String,             // public, private, confidential
-    pub priority: Option<u8>,      // 0-9 priority level
-    pub organizer: String,         // organizer email
-    pub attendees: String,         // comma-separated attendee emails
-    pub categories: String,        // comma-separated categories
-    pub reminder: String,          // reminder type
-    
+    pub status: String,       // confirmed, tentative, cancelled
+    pub class: String,        // public, private, confidential
+    pub priority: Option<u8>, // 0-9 priority level
+    pub organizer: String,    // organizer email
+    pub attendees: String,    // comma-separated attendee emails
+    pub categories: String,   // comma-separated categories
+    pub reminder: String,     // reminder type
+
     // Series-specific fields
-    pub recurrence: String,        // recurrence type (daily, weekly, monthly, yearly)
+    pub recurrence: String, // recurrence type (daily, weekly, monthly, yearly)
     pub recurrence_days: Vec<bool>, // [Sun, Mon, Tue, Wed, Thu, Fri, Sat] for weekly recurrence
     pub recurrence_interval: Option<u32>, // Every N days/weeks/months/years
     pub recurrence_end_date: Option<String>, // When the series ends (YYYY-MM-DD)
     pub recurrence_count: Option<u32>, // Number of occurrences
     pub calendar_path: Option<String>, // Optional - search all calendars if not specified
-    
+
     // Update scope control
-    pub update_scope: String,      // "this_only", "this_and_future", "all_in_series"
+    pub update_scope: String, // "this_only", "this_and_future", "all_in_series"
     pub occurrence_date: Option<String>, // ISO date string for specific occurrence being updated
     pub changed_fields: Option<Vec<String>>, // List of field names that were changed (for optimization)
 }
@@ -214,12 +234,12 @@ pub struct UpdateEventSeriesResponse {
 
 #[derive(Debug, Deserialize)]
 pub struct DeleteEventSeriesRequest {
-    pub series_uid: String,        // Series UID to identify which series to delete
+    pub series_uid: String, // Series UID to identify which series to delete
     pub calendar_path: String,
     pub event_href: String,
-    
+
     // Delete scope control
-    pub delete_scope: String,      // "this_only", "this_and_future", "all_in_series"
+    pub delete_scope: String, // "this_only", "this_and_future", "all_in_series"
     pub occurrence_date: Option<String>, // ISO date string for specific occurrence being deleted
 }
 
@@ -274,4 +294,4 @@ impl std::fmt::Display for ApiError {
     }
 }
 
-impl std::error::Error for ApiError {}
+impl std::error::Error for ApiError {}

backend/tests/integration_tests.rs

@@ -1,26 +1,26 @@
-use calendar_backend::AppState;
-use calendar_backend::auth::AuthService;
-use reqwest::Client;
-use serde_json::json;
-use std::time::Duration;
-use tokio::time::sleep;
 use axum::{
     response::Json,
     routing::{get, post},
     Router,
 };
-use tower_http::cors::{CorsLayer, Any};
+use calendar_backend::auth::AuthService;
+use calendar_backend::AppState;
+use reqwest::Client;
+use serde_json::json;
 use std::sync::Arc;
+use std::time::Duration;
+use tokio::time::sleep;
+use tower_http::cors::{Any, CorsLayer};
 
 /// Test utilities for integration testing
 mod test_utils {
     use super::*;
-    
+
     pub struct TestServer {
         pub base_url: String,
         pub client: Client,
     }
-    
+
     impl TestServer {
         pub async fn start() -> Self {
             // Create auth service
@@ -33,19 +33,55 @@ mod test_utils {
                 .route("/", get(root))
                 .route("/api/health", get(health_check))
                 .route("/api/auth/login", post(calendar_backend::handlers::login))
-                .route("/api/auth/verify", get(calendar_backend::handlers::verify_token))
-                .route("/api/user/info", get(calendar_backend::handlers::get_user_info))
-                .route("/api/calendar/create", post(calendar_backend::handlers::create_calendar))
-                .route("/api/calendar/delete", post(calendar_backend::handlers::delete_calendar))
-                .route("/api/calendar/events", get(calendar_backend::handlers::get_calendar_events))
-                .route("/api/calendar/events/create", post(calendar_backend::handlers::create_event))
-                .route("/api/calendar/events/update", post(calendar_backend::handlers::update_event))
-                .route("/api/calendar/events/delete", post(calendar_backend::handlers::delete_event))
-                .route("/api/calendar/events/:uid", get(calendar_backend::handlers::refresh_event))
+                .route(
+                    "/api/auth/verify",
+                    get(calendar_backend::handlers::verify_token),
+                )
+                .route(
+                    "/api/user/info",
+                    get(calendar_backend::handlers::get_user_info),
+                )
+                .route(
+                    "/api/calendar/create",
+                    post(calendar_backend::handlers::create_calendar),
+                )
+                .route(
+                    "/api/calendar/delete",
+                    post(calendar_backend::handlers::delete_calendar),
+                )
+                .route(
+                    "/api/calendar/events",
+                    get(calendar_backend::handlers::get_calendar_events),
+                )
+                .route(
+                    "/api/calendar/events/create",
+                    post(calendar_backend::handlers::create_event),
+                )
+                .route(
+                    "/api/calendar/events/update",
+                    post(calendar_backend::handlers::update_event),
+                )
+                .route(
+                    "/api/calendar/events/delete",
+                    post(calendar_backend::handlers::delete_event),
+                )
+                .route(
+                    "/api/calendar/events/:uid",
+                    get(calendar_backend::handlers::refresh_event),
+                )
                 // Event series-specific endpoints
-                .route("/api/calendar/events/series/create", post(calendar_backend::handlers::create_event_series))
-                .route("/api/calendar/events/series/update", post(calendar_backend::handlers::update_event_series))
-                .route("/api/calendar/events/series/delete", post(calendar_backend::handlers::delete_event_series))
+                .route(
+                    "/api/calendar/events/series/create",
+                    post(calendar_backend::handlers::create_event_series),
+                )
+                .route(
+                    "/api/calendar/events/series/update",
+                    post(calendar_backend::handlers::update_event_series),
+                )
+                .route(
+                    "/api/calendar/events/series/delete",
+                    post(calendar_backend::handlers::delete_event_series),
+                )
                 .layer(
                     CorsLayer::new()
                         .allow_origin(Any)
@@ -58,39 +94,47 @@ mod test_utils {
             let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.unwrap();
             let addr = listener.local_addr().unwrap();
             let base_url = format!("http://127.0.0.1:{}", addr.port());
-            
+
             tokio::spawn(async move {
                 axum::serve(listener, app).await.unwrap();
             });
-            
+
             // Wait for server to start
             sleep(Duration::from_millis(100)).await;
-            
+
             let client = Client::new();
             TestServer { base_url, client }
         }
-        
+
         pub async fn login(&self) -> String {
             let login_payload = json!({
-                "username": std::env::var("CALDAV_USERNAME").unwrap_or("test".to_string()),
-                "password": std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string()),
-                "server_url": std::env::var("CALDAV_SERVER_URL").unwrap_or("https://example.com".to_string())
+                "username": "test".to_string(),
+                "password": "test".to_string(),
+                "server_url": "https://example.com".to_string()
             });
-            
-            let response = self.client
+
+            let response = self
+                .client
                 .post(&format!("{}/api/auth/login", self.base_url))
                 .json(&login_payload)
                 .send()
                 .await
                 .expect("Failed to send login request");
-                
-            assert!(response.status().is_success(), "Login failed with status: {}", response.status());
-            
+
+            assert!(
+                response.status().is_success(),
+                "Login failed with status: {}",
+                response.status()
+            );
+
             let login_response: serde_json::Value = response.json().await.unwrap();
-            login_response["token"].as_str().expect("Login response should contain token").to_string()
+            login_response["token"]
+                .as_str()
+                .expect("Login response should contain token")
+                .to_string()
         }
     }
-    
+
     async fn root() -> &'static str {
         "Calendar Backend API v0.1.0"
     }
@@ -106,26 +150,27 @@ mod test_utils {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use super::test_utils::*;
+    use super::*;
 
     /// Test the health endpoint
     #[tokio::test]
     async fn test_health_endpoint() {
         let server = TestServer::start().await;
-        
-        let response = server.client
+
+        let response = server
+            .client
             .get(&format!("{}/api/health", server.base_url))
             .send()
             .await
             .unwrap();
-            
+
         assert_eq!(response.status(), 200);
-        
+
         let health_response: serde_json::Value = response.json().await.unwrap();
         assert_eq!(health_response["status"], "healthy");
         assert_eq!(health_response["service"], "calendar-backend");
-        
+
         println!("✓ Health endpoint test passed");
     }
 
@@ -133,33 +178,42 @@ mod tests {
     #[tokio::test]
     async fn test_auth_login() {
         let server = TestServer::start().await;
-        
-        // Load credentials from .env 
-        dotenvy::dotenv().ok();
-        let username = std::env::var("CALDAV_USERNAME").unwrap_or("test".to_string());
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
-        let server_url = std::env::var("CALDAV_SERVER_URL").unwrap_or("https://example.com".to_string());
-        
+
+        // Use test credentials
+        let username = "test".to_string();
+        let password = "test".to_string();
+        let server_url = "https://example.com".to_string();
+
         let login_payload = json!({
             "username": username,
             "password": password,
             "server_url": server_url
         });
-        
-        let response = server.client
+
+        let response = server
+            .client
             .post(&format!("{}/api/auth/login", server.base_url))
             .json(&login_payload)
             .send()
             .await
             .unwrap();
-            
-        assert!(response.status().is_success(), "Login failed with status: {}", response.status());
-        
+
+        assert!(
+            response.status().is_success(),
+            "Login failed with status: {}",
+            response.status()
+        );
+
         let login_response: serde_json::Value = response.json().await.unwrap();
-        assert!(login_response["token"].is_string(), "Login response should contain a token");
-        assert!(login_response["username"].is_string(), "Login response should contain username");
-        
+        assert!(
+            login_response["token"].is_string(),
+            "Login response should contain a token"
+        );
+        assert!(
+            login_response["username"].is_string(),
+            "Login response should contain username"
+        );
+
         println!("✓ Authentication login test passed");
     }
 
@@ -167,52 +221,57 @@ mod tests {
     #[tokio::test]
     async fn test_auth_verify() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
-        let response = server.client
+
+        let response = server
+            .client
             .get(&format!("{}/api/auth/verify", server.base_url))
             .header("Authorization", format!("Bearer {}", token))
             .send()
             .await
             .unwrap();
-            
+
         assert_eq!(response.status(), 200);
-        
+
         let verify_response: serde_json::Value = response.json().await.unwrap();
         assert!(verify_response["valid"].as_bool().unwrap_or(false));
-        
+
         println!("✓ Authentication verify test passed");
     }
 
     /// Test user info endpoint
-    #[tokio::test] 
+    #[tokio::test]
     async fn test_user_info() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
-        let response = server.client
+        let password = "test".to_string();
+
+        let response = server
+            .client
             .get(&format!("{}/api/user/info", server.base_url))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .send()
             .await
             .unwrap();
-            
+
         // Note: This might fail if CalDAV server discovery fails, which can happen
         if response.status().is_success() {
             let user_info: serde_json::Value = response.json().await.unwrap();
             assert!(user_info["username"].is_string());
             println!("✓ User info test passed");
         } else {
-            println!("⚠ User info test skipped (CalDAV server issues): {}", response.status());
+            println!(
+                "⚠ User info test skipped (CalDAV server issues): {}",
+                response.status()
+            );
         }
     }
 
@@ -220,48 +279,59 @@ mod tests {
     #[tokio::test]
     async fn test_get_calendar_events() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
-        // Load password from env for CalDAV requests  
+
+        // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
-        let response = server.client
-            .get(&format!("{}/api/calendar/events?year=2024&month=12", server.base_url))
+        let password = "test".to_string();
+
+        let response = server
+            .client
+            .get(&format!(
+                "{}/api/calendar/events?year=2024&month=12",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .send()
             .await
             .unwrap();
-            
-        assert!(response.status().is_success(), "Get events failed with status: {}", response.status());
-        
+
+        assert!(
+            response.status().is_success(),
+            "Get events failed with status: {}",
+            response.status()
+        );
+
         let events: serde_json::Value = response.json().await.unwrap();
         assert!(events.is_array());
-        
-        println!("✓ Get calendar events test passed (found {} events)", events.as_array().unwrap().len());
+
+        println!(
+            "✓ Get calendar events test passed (found {} events)",
+            events.as_array().unwrap().len()
+        );
     }
 
     /// Test event creation endpoint
     #[tokio::test]
     async fn test_create_event() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         // Load password from env for CalDAV requests
-        dotenvy::dotenv().ok(); 
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
+        dotenvy::dotenv().ok();
+        let password = "test".to_string();
+
         let create_payload = json!({
             "title": "Integration Test Event",
             "description": "Created by integration test",
             "start_date": "2024-12-25",
             "start_time": "10:00",
-            "end_date": "2024-12-25", 
+            "end_date": "2024-12-25",
             "end_time": "11:00",
             "location": "Test Location",
             "all_day": false,
@@ -275,8 +345,9 @@ mod tests {
             "recurrence": "none",
             "recurrence_days": [false, false, false, false, false, false, false]
         });
-        
-        let response = server.client
+
+        let response = server
+            .client
             .post(&format!("{}/api/calendar/events/create", server.base_url))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
@@ -284,10 +355,10 @@ mod tests {
             .send()
             .await
             .unwrap();
-            
+
         let status = response.status();
         println!("Create event response status: {}", status);
-        
+
         // Note: This might fail if CalDAV server is not accessible, which is expected in CI
         if status.is_success() {
             let create_response: serde_json::Value = response.json().await.unwrap();
@@ -302,47 +373,58 @@ mod tests {
     #[tokio::test]
     async fn test_refresh_event() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
+        let password = "test".to_string();
+
         // Use a dummy UID for testing - this will likely return 404 but we're testing the endpoint structure
         let test_uid = "test-event-uid";
-        
-        let response = server.client
-            .get(&format!("{}/api/calendar/events/{}", server.base_url, test_uid))
+
+        let response = server
+            .client
+            .get(&format!(
+                "{}/api/calendar/events/{}",
+                server.base_url, test_uid
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .send()
             .await
             .unwrap();
-            
+
         // We expect either 200 (if event exists) or 404 (if not found) - both are valid responses
-        assert!(response.status() == 200 || response.status() == 404, 
-               "Refresh event failed with unexpected status: {}", response.status());
-               
+        assert!(
+            response.status() == 200 || response.status() == 404,
+            "Refresh event failed with unexpected status: {}",
+            response.status()
+        );
+
         println!("✓ Refresh event endpoint test passed");
     }
-    
+
     /// Test invalid authentication
     #[tokio::test]
     async fn test_invalid_auth() {
         let server = TestServer::start().await;
-        
-        let response = server.client
+
+        let response = server
+            .client
             .get(&format!("{}/api/user/info", server.base_url))
             .header("Authorization", "Bearer invalid-token")
             .send()
             .await
             .unwrap();
-            
+
         // Accept both 400 and 401 as valid responses for invalid tokens
-        assert!(response.status() == 401 || response.status() == 400, 
-               "Expected 401 or 400 for invalid token, got {}", response.status());
+        assert!(
+            response.status() == 401 || response.status() == 400,
+            "Expected 401 or 400 for invalid token, got {}",
+            response.status()
+        );
         println!("✓ Invalid authentication test passed");
     }
 
@@ -350,13 +432,14 @@ mod tests {
     #[tokio::test]
     async fn test_missing_auth() {
         let server = TestServer::start().await;
-        
-        let response = server.client
+
+        let response = server
+            .client
             .get(&format!("{}/api/user/info", server.base_url))
             .send()
             .await
             .unwrap();
-            
+
         assert_eq!(response.status(), 401);
         println!("✓ Missing authentication test passed");
     }
@@ -367,20 +450,20 @@ mod tests {
     #[tokio::test]
     async fn test_create_event_series() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
+        let password = "test".to_string();
+
         let create_payload = json!({
             "title": "Integration Test Series",
             "description": "Created by integration test for series",
             "start_date": "2024-12-25",
             "start_time": "10:00",
-            "end_date": "2024-12-25", 
+            "end_date": "2024-12-25",
             "end_time": "11:00",
             "location": "Test Series Location",
             "all_day": false,
@@ -397,19 +480,23 @@ mod tests {
             "recurrence_count": 4,
             "calendar_path": "/calendars/test/default/" // Provide explicit path to bypass discovery
         });
-        
-        let response = server.client
-            .post(&format!("{}/api/calendar/events/series/create", server.base_url))
+
+        let response = server
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/create",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .json(&create_payload)
             .send()
             .await
             .unwrap();
-            
+
         let status = response.status();
         println!("Create series response status: {}", status);
-        
+
         // Note: This might fail if CalDAV server is not accessible, which is expected in CI
         if status.is_success() {
             let create_response: serde_json::Value = response.json().await.unwrap();
@@ -422,24 +509,24 @@ mod tests {
     }
 
     /// Test event series update endpoint
-    #[tokio::test] 
+    #[tokio::test]
     async fn test_update_event_series() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
+        let password = "test".to_string();
+
         let update_payload = json!({
             "series_uid": "test-series-uid",
             "title": "Updated Series Title",
             "description": "Updated by integration test",
             "start_date": "2024-12-26",
             "start_time": "14:00",
-            "end_date": "2024-12-26", 
+            "end_date": "2024-12-26",
             "end_time": "15:00",
             "location": "Updated Location",
             "all_day": false,
@@ -457,27 +544,36 @@ mod tests {
             "update_scope": "all_in_series",
             "calendar_path": "/calendars/test/default/" // Provide explicit path to bypass discovery
         });
-        
-        let response = server.client
-            .post(&format!("{}/api/calendar/events/series/update", server.base_url))
+
+        let response = server
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/update",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .json(&update_payload)
             .send()
             .await
             .unwrap();
-            
+
         let status = response.status();
         println!("Update series response status: {}", status);
-        
+
         // Note: This might fail if CalDAV server is not accessible or event doesn't exist, which is expected in CI
         if status.is_success() {
             let update_response: serde_json::Value = response.json().await.unwrap();
             assert!(update_response["success"].as_bool().unwrap_or(false));
-            assert_eq!(update_response["series_uid"].as_str().unwrap(), "test-series-uid");
+            assert_eq!(
+                update_response["series_uid"].as_str().unwrap(),
+                "test-series-uid"
+            );
             println!("✓ Update event series test passed");
         } else if status == 404 {
-            println!("⚠ Update event series test skipped (event not found - expected for test data)");
+            println!(
+                "⚠ Update event series test skipped (event not found - expected for test data)"
+            );
         } else {
             println!("⚠ Update event series test skipped (CalDAV server not accessible)");
         }
@@ -487,40 +583,46 @@ mod tests {
     #[tokio::test]
     async fn test_delete_event_series() {
         let server = TestServer::start().await;
-        
-        // First login to get a token  
+
+        // First login to get a token
         let token = server.login().await;
-        
+
         // Load password from env for CalDAV requests
         dotenvy::dotenv().ok();
-        let password = std::env::var("CALDAV_PASSWORD").unwrap_or("test".to_string());
-        
+        let password = "test".to_string();
+
         let delete_payload = json!({
             "series_uid": "test-series-to-delete",
             "calendar_path": "/calendars/test/default/",
             "event_href": "test-series.ics",
             "delete_scope": "all_in_series"
         });
-        
-        let response = server.client
-            .post(&format!("{}/api/calendar/events/series/delete", server.base_url))
+
+        let response = server
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/delete",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .header("X-CalDAV-Password", password)
             .json(&delete_payload)
             .send()
             .await
             .unwrap();
-            
+
         let status = response.status();
         println!("Delete series response status: {}", status);
-        
+
         // Note: This might fail if CalDAV server is not accessible or event doesn't exist, which is expected in CI
         if status.is_success() {
             let delete_response: serde_json::Value = response.json().await.unwrap();
             assert!(delete_response["success"].as_bool().unwrap_or(false));
             println!("✓ Delete event series test passed");
         } else if status == 404 {
-            println!("⚠ Delete event series test skipped (event not found - expected for test data)");
+            println!(
+                "⚠ Delete event series test skipped (event not found - expected for test data)"
+            );
         } else {
             println!("⚠ Delete event series test skipped (CalDAV server not accessible)");
         }
@@ -530,17 +632,17 @@ mod tests {
     #[tokio::test]
     async fn test_invalid_update_scope() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         let invalid_payload = json!({
             "series_uid": "test-series-uid",
             "title": "Test Title",
             "description": "Test",
             "start_date": "2024-12-25",
             "start_time": "10:00",
-            "end_date": "2024-12-25", 
+            "end_date": "2024-12-25",
             "end_time": "11:00",
             "location": "Test",
             "all_day": false,
@@ -554,16 +656,24 @@ mod tests {
             "recurrence_days": [false, false, false, false, false, false, false],
             "update_scope": "invalid_scope" // This should cause a 400 error
         });
-        
-        let response = server.client
-            .post(&format!("{}/api/calendar/events/series/update", server.base_url))
+
+        let response = server
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/update",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .json(&invalid_payload)
             .send()
             .await
             .unwrap();
-            
-        assert_eq!(response.status(), 400, "Expected 400 for invalid update scope");
+
+        assert_eq!(
+            response.status(),
+            400,
+            "Expected 400 for invalid update scope"
+        );
         println!("✓ Invalid update scope test passed");
     }
 
@@ -571,16 +681,16 @@ mod tests {
     #[tokio::test]
     async fn test_non_recurring_series_rejection() {
         let server = TestServer::start().await;
-        
+
         // First login to get a token
         let token = server.login().await;
-        
+
         let non_recurring_payload = json!({
             "title": "Non-recurring Event",
             "description": "This should be rejected",
             "start_date": "2024-12-25",
             "start_time": "10:00",
-            "end_date": "2024-12-25", 
+            "end_date": "2024-12-25",
             "end_time": "11:00",
             "location": "Test",
             "all_day": false,
@@ -593,16 +703,24 @@ mod tests {
             "recurrence": "none", // This should cause rejection
             "recurrence_days": [false, false, false, false, false, false, false]
         });
-        
-        let response = server.client
-            .post(&format!("{}/api/calendar/events/series/create", server.base_url))
+
+        let response = server
+            .client
+            .post(&format!(
+                "{}/api/calendar/events/series/create",
+                server.base_url
+            ))
             .header("Authorization", format!("Bearer {}", token))
             .json(&non_recurring_payload)
             .send()
             .await
             .unwrap();
-            
-        assert_eq!(response.status(), 400, "Expected 400 for non-recurring event in series endpoint");
+
+        assert_eq!(
+            response.status(),
+            400,
+            "Expected 400 for non-recurring event in series endpoint"
+        );
         println!("✓ Non-recurring series rejection test passed");
     }
-}
+}

calendar-models/src/common.rs

@@ -1,6 +1,6 @@
 //! Common types and enums used across calendar components
 
-use chrono::{DateTime, Utc, Duration};
+use chrono::{DateTime, Duration, Utc};
 use serde::{Deserialize, Serialize};
 
 // ==================== ENUMS AND COMMON TYPES ====================
@@ -22,7 +22,7 @@ pub enum EventClass {
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub enum TimeTransparency {
     Opaque,      // OPAQUE - time is not available
-    Transparent, // TRANSPARENT - time is available  
+    Transparent, // TRANSPARENT - time is available
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
@@ -64,11 +64,11 @@ pub enum AlarmAction {
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct CalendarUser {
-    pub cal_address: String,                    // Calendar user address (usually email)
-    pub common_name: Option<String>,            // CN parameter - display name
-    pub dir_entry_ref: Option<String>,          // DIR parameter - directory entry
-    pub sent_by: Option<String>,                // SENT-BY parameter
-    pub language: Option<String>,               // LANGUAGE parameter
+    pub cal_address: String,           // Calendar user address (usually email)
+    pub common_name: Option<String>,   // CN parameter - display name
+    pub dir_entry_ref: Option<String>, // DIR parameter - directory entry
+    pub sent_by: Option<String>,       // SENT-BY parameter
+    pub language: Option<String>,      // LANGUAGE parameter
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
@@ -78,130 +78,130 @@ pub struct Attendee {
     pub role: Option<AttendeeRole>,             // ROLE parameter
     pub part_stat: Option<ParticipationStatus>, // PARTSTAT parameter
     pub rsvp: Option<bool>,                     // RSVP parameter
-    pub cu_type: Option<String>,                // CUTYPE parameter (INDIVIDUAL, GROUP, RESOURCE, ROOM, UNKNOWN)
-    pub member: Vec<String>,                    // MEMBER parameter
-    pub delegated_to: Vec<String>,              // DELEGATED-TO parameter  
-    pub delegated_from: Vec<String>,            // DELEGATED-FROM parameter
-    pub sent_by: Option<String>,                // SENT-BY parameter
-    pub dir_entry_ref: Option<String>,          // DIR parameter
-    pub language: Option<String>,               // LANGUAGE parameter
+    pub cu_type: Option<String>, // CUTYPE parameter (INDIVIDUAL, GROUP, RESOURCE, ROOM, UNKNOWN)
+    pub member: Vec<String>,     // MEMBER parameter
+    pub delegated_to: Vec<String>, // DELEGATED-TO parameter
+    pub delegated_from: Vec<String>, // DELEGATED-FROM parameter
+    pub sent_by: Option<String>, // SENT-BY parameter
+    pub dir_entry_ref: Option<String>, // DIR parameter
+    pub language: Option<String>, // LANGUAGE parameter
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct VAlarm {
-    pub action: AlarmAction,                    // Action (ACTION) - REQUIRED
-    pub trigger: AlarmTrigger,                  // Trigger (TRIGGER) - REQUIRED
-    pub duration: Option<Duration>,             // Duration (DURATION)
-    pub repeat: Option<u32>,                    // Repeat count (REPEAT)
-    pub description: Option<String>,            // Description for DISPLAY/EMAIL
-    pub summary: Option<String>,                // Summary for EMAIL
-    pub attendees: Vec<Attendee>,               // Attendees for EMAIL
-    pub attach: Vec<Attachment>,                // Attachments for AUDIO/EMAIL
+    pub action: AlarmAction,         // Action (ACTION) - REQUIRED
+    pub trigger: AlarmTrigger,       // Trigger (TRIGGER) - REQUIRED
+    pub duration: Option<Duration>,  // Duration (DURATION)
+    pub repeat: Option<u32>,         // Repeat count (REPEAT)
+    pub description: Option<String>, // Description for DISPLAY/EMAIL
+    pub summary: Option<String>,     // Summary for EMAIL
+    pub attendees: Vec<Attendee>,    // Attendees for EMAIL
+    pub attach: Vec<Attachment>,     // Attachments for AUDIO/EMAIL
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub enum AlarmTrigger {
-    DateTime(DateTime<Utc>),                    // Absolute trigger time
-    Duration(Duration),                         // Duration relative to start/end
+    DateTime(DateTime<Utc>), // Absolute trigger time
+    Duration(Duration),      // Duration relative to start/end
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct Attachment {
-    pub format_type: Option<String>,            // FMTTYPE parameter (MIME type)
-    pub encoding: Option<String>,               // ENCODING parameter
-    pub value: Option<String>,                  // VALUE parameter (BINARY or URI)
-    pub uri: Option<String>,                    // URI reference
-    pub binary_data: Option<Vec<u8>>,           // Binary data (when ENCODING=BASE64)
+    pub format_type: Option<String>,  // FMTTYPE parameter (MIME type)
+    pub encoding: Option<String>,     // ENCODING parameter
+    pub value: Option<String>,        // VALUE parameter (BINARY or URI)
+    pub uri: Option<String>,          // URI reference
+    pub binary_data: Option<Vec<u8>>, // Binary data (when ENCODING=BASE64)
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct GeographicPosition {
-    pub latitude: f64,                          // Latitude in decimal degrees
-    pub longitude: f64,                         // Longitude in decimal degrees
+    pub latitude: f64,  // Latitude in decimal degrees
+    pub longitude: f64, // Longitude in decimal degrees
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct VTimeZone {
-    pub tzid: String,                           // Time zone ID (TZID) - REQUIRED
-    pub last_modified: Option<DateTime<Utc>>,   // Last modified (LAST-MODIFIED)
-    pub tzurl: Option<String>,                  // Time zone URL (TZURL)
+    pub tzid: String,                                // Time zone ID (TZID) - REQUIRED
+    pub last_modified: Option<DateTime<Utc>>,        // Last modified (LAST-MODIFIED)
+    pub tzurl: Option<String>,                       // Time zone URL (TZURL)
     pub standard_components: Vec<TimeZoneComponent>, // STANDARD components
     pub daylight_components: Vec<TimeZoneComponent>, // DAYLIGHT components
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct TimeZoneComponent {
-    pub dtstart: DateTime<Utc>,                 // Start of this time zone definition
-    pub tzoffset_to: String,                    // UTC offset for this component
-    pub tzoffset_from: String,                  // UTC offset before this component  
-    pub rrule: Option<String>,                  // Recurrence rule
-    pub rdate: Vec<DateTime<Utc>>,              // Recurrence dates
-    pub tzname: Vec<String>,                    // Time zone names
-    pub comment: Vec<String>,                   // Comments
+    pub dtstart: DateTime<Utc>,    // Start of this time zone definition
+    pub tzoffset_to: String,       // UTC offset for this component
+    pub tzoffset_from: String,     // UTC offset before this component
+    pub rrule: Option<String>,     // Recurrence rule
+    pub rdate: Vec<DateTime<Utc>>, // Recurrence dates
+    pub tzname: Vec<String>,       // Time zone names
+    pub comment: Vec<String>,      // Comments
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct VJournal {
     // Required properties
-    pub dtstamp: DateTime<Utc>,                 // Date-time stamp (DTSTAMP) - REQUIRED
-    pub uid: String,                            // Unique identifier (UID) - REQUIRED
-    
+    pub dtstamp: DateTime<Utc>, // Date-time stamp (DTSTAMP) - REQUIRED
+    pub uid: String,            // Unique identifier (UID) - REQUIRED
+
     // Optional properties
-    pub dtstart: Option<DateTime<Utc>>,         // Start date-time (DTSTART)
-    pub summary: Option<String>,                // Summary/title (SUMMARY) 
-    pub description: Option<String>,            // Description (DESCRIPTION)
-    
+    pub dtstart: Option<DateTime<Utc>>, // Start date-time (DTSTART)
+    pub summary: Option<String>,        // Summary/title (SUMMARY)
+    pub description: Option<String>,    // Description (DESCRIPTION)
+
     // Classification and status
-    pub class: Option<EventClass>,              // Classification (CLASS)
-    pub status: Option<String>,                 // Status (STATUS)
-    
+    pub class: Option<EventClass>, // Classification (CLASS)
+    pub status: Option<String>,    // Status (STATUS)
+
     // People and organization
-    pub organizer: Option<CalendarUser>,        // Organizer (ORGANIZER)
-    pub attendees: Vec<Attendee>,               // Attendees (ATTENDEE)
-    
+    pub organizer: Option<CalendarUser>, // Organizer (ORGANIZER)
+    pub attendees: Vec<Attendee>,        // Attendees (ATTENDEE)
+
     // Categorization
-    pub categories: Vec<String>,                // Categories (CATEGORIES)
-    
+    pub categories: Vec<String>, // Categories (CATEGORIES)
+
     // Versioning and modification
-    pub sequence: Option<u32>,                  // Sequence number (SEQUENCE)
-    pub created: Option<DateTime<Utc>>,         // Creation time (CREATED)
-    pub last_modified: Option<DateTime<Utc>>,   // Last modified (LAST-MODIFIED)
-    
+    pub sequence: Option<u32>,                // Sequence number (SEQUENCE)
+    pub created: Option<DateTime<Utc>>,       // Creation time (CREATED)
+    pub last_modified: Option<DateTime<Utc>>, // Last modified (LAST-MODIFIED)
+
     // Recurrence
-    pub rrule: Option<String>,                  // Recurrence rule (RRULE)
-    pub rdate: Vec<DateTime<Utc>>,              // Recurrence dates (RDATE)
-    pub exdate: Vec<DateTime<Utc>>,             // Exception dates (EXDATE)
-    pub recurrence_id: Option<DateTime<Utc>>,   // Recurrence ID (RECURRENCE-ID)
-    
+    pub rrule: Option<String>,                // Recurrence rule (RRULE)
+    pub rdate: Vec<DateTime<Utc>>,            // Recurrence dates (RDATE)
+    pub exdate: Vec<DateTime<Utc>>,           // Exception dates (EXDATE)
+    pub recurrence_id: Option<DateTime<Utc>>, // Recurrence ID (RECURRENCE-ID)
+
     // Attachments
-    pub attachments: Vec<Attachment>,           // Attachments (ATTACH)
+    pub attachments: Vec<Attachment>, // Attachments (ATTACH)
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct VFreeBusy {
     // Required properties
-    pub dtstamp: DateTime<Utc>,                 // Date-time stamp (DTSTAMP) - REQUIRED
-    pub uid: String,                            // Unique identifier (UID) - REQUIRED
-    
+    pub dtstamp: DateTime<Utc>, // Date-time stamp (DTSTAMP) - REQUIRED
+    pub uid: String,            // Unique identifier (UID) - REQUIRED
+
     // Optional date-time properties
-    pub dtstart: Option<DateTime<Utc>>,         // Start date-time (DTSTART)
-    pub dtend: Option<DateTime<Utc>>,           // End date-time (DTEND)
-    
+    pub dtstart: Option<DateTime<Utc>>, // Start date-time (DTSTART)
+    pub dtend: Option<DateTime<Utc>>,   // End date-time (DTEND)
+
     // People
-    pub organizer: Option<CalendarUser>,        // Organizer (ORGANIZER)
-    pub attendees: Vec<Attendee>,               // Attendees (ATTENDEE)
-    
+    pub organizer: Option<CalendarUser>, // Organizer (ORGANIZER)
+    pub attendees: Vec<Attendee>,        // Attendees (ATTENDEE)
+
     // Free/busy time
-    pub freebusy: Vec<FreeBusyTime>,            // Free/busy time periods
-    pub url: Option<String>,                    // URL (URL)
-    pub comment: Vec<String>,                   // Comments (COMMENT)
-    pub contact: Option<String>,                // Contact information (CONTACT)
+    pub freebusy: Vec<FreeBusyTime>, // Free/busy time periods
+    pub url: Option<String>,         // URL (URL)
+    pub comment: Vec<String>,        // Comments (COMMENT)
+    pub contact: Option<String>,     // Contact information (CONTACT)
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct FreeBusyTime {
-    pub fb_type: FreeBusyType,                  // Free/busy type
-    pub periods: Vec<Period>,                   // Time periods
+    pub fb_type: FreeBusyType, // Free/busy type
+    pub periods: Vec<Period>,  // Time periods
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
@@ -214,7 +214,7 @@ pub enum FreeBusyType {
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct Period {
-    pub start: DateTime<Utc>,                   // Period start
-    pub end: Option<DateTime<Utc>>,             // Period end
-    pub duration: Option<Duration>,             // Period duration (alternative to end)
-}
+    pub start: DateTime<Utc>,       // Period start
+    pub end: Option<DateTime<Utc>>, // Period end
+    pub duration: Option<Duration>, // Period duration (alternative to end)
+}

calendar-models/src/lib.rs

@@ -1,10 +1,10 @@
 //! RFC 5545 Compliant Calendar Models
-//! 
+//!
 //! This crate provides shared data structures for calendar applications
 //! that comply with RFC 5545 (iCalendar) specification.
 
-pub mod vevent;
 pub mod common;
+pub mod vevent;
 
+pub use common::*;
 pub use vevent::*;
-pub use common::*;

calendar-models/src/vevent.rs

@@ -1,66 +1,66 @@
 //! VEvent - RFC 5545 compliant calendar event structure
 
-use chrono::{DateTime, Utc, Duration};
-use serde::{Deserialize, Serialize};
 use crate::common::*;
+use chrono::{DateTime, Duration, Utc};
+use serde::{Deserialize, Serialize};
 
 // ==================== VEVENT COMPONENT ====================
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct VEvent {
     // Required properties
-    pub dtstamp: DateTime<Utc>,                 // Date-time stamp (DTSTAMP) - REQUIRED
-    pub uid: String,                            // Unique identifier (UID) - REQUIRED
-    pub dtstart: DateTime<Utc>,                 // Start date-time (DTSTART) - REQUIRED
-    
+    pub dtstamp: DateTime<Utc>, // Date-time stamp (DTSTAMP) - REQUIRED
+    pub uid: String,            // Unique identifier (UID) - REQUIRED
+    pub dtstart: DateTime<Utc>, // Start date-time (DTSTART) - REQUIRED
+
     // Optional properties (commonly used)
-    pub dtend: Option<DateTime<Utc>>,           // End date-time (DTEND)
-    pub duration: Option<Duration>,             // Duration (DURATION) - alternative to DTEND
-    pub summary: Option<String>,                // Summary/title (SUMMARY)
-    pub description: Option<String>,            // Description (DESCRIPTION)
-    pub location: Option<String>,               // Location (LOCATION)
-    
+    pub dtend: Option<DateTime<Utc>>, // End date-time (DTEND)
+    pub duration: Option<Duration>,   // Duration (DURATION) - alternative to DTEND
+    pub summary: Option<String>,      // Summary/title (SUMMARY)
+    pub description: Option<String>,  // Description (DESCRIPTION)
+    pub location: Option<String>,     // Location (LOCATION)
+
     // Classification and status
-    pub class: Option<EventClass>,              // Classification (CLASS)
-    pub status: Option<EventStatus>,            // Status (STATUS)
-    pub transp: Option<TimeTransparency>,       // Time transparency (TRANSP)
-    pub priority: Option<u8>,                   // Priority 0-9 (PRIORITY)
-    
+    pub class: Option<EventClass>,        // Classification (CLASS)
+    pub status: Option<EventStatus>,      // Status (STATUS)
+    pub transp: Option<TimeTransparency>, // Time transparency (TRANSP)
+    pub priority: Option<u8>,             // Priority 0-9 (PRIORITY)
+
     // People and organization
-    pub organizer: Option<CalendarUser>,        // Organizer (ORGANIZER)
-    pub attendees: Vec<Attendee>,               // Attendees (ATTENDEE)
-    pub contact: Option<String>,                // Contact information (CONTACT)
-    
+    pub organizer: Option<CalendarUser>, // Organizer (ORGANIZER)
+    pub attendees: Vec<Attendee>,        // Attendees (ATTENDEE)
+    pub contact: Option<String>,         // Contact information (CONTACT)
+
     // Categorization and relationships
-    pub categories: Vec<String>,                // Categories (CATEGORIES)
-    pub comment: Option<String>,                // Comment (COMMENT)
-    pub resources: Vec<String>,                 // Resources (RESOURCES)
-    pub related_to: Option<String>,             // Related component (RELATED-TO)
-    pub url: Option<String>,                    // URL (URL)
-    
+    pub categories: Vec<String>,    // Categories (CATEGORIES)
+    pub comment: Option<String>,    // Comment (COMMENT)
+    pub resources: Vec<String>,     // Resources (RESOURCES)
+    pub related_to: Option<String>, // Related component (RELATED-TO)
+    pub url: Option<String>,        // URL (URL)
+
     // Geographical
-    pub geo: Option<GeographicPosition>,        // Geographic position (GEO)
-    
+    pub geo: Option<GeographicPosition>, // Geographic position (GEO)
+
     // Versioning and modification
-    pub sequence: Option<u32>,                  // Sequence number (SEQUENCE)
-    pub created: Option<DateTime<Utc>>,         // Creation time (CREATED)
-    pub last_modified: Option<DateTime<Utc>>,   // Last modified (LAST-MODIFIED)
-    
+    pub sequence: Option<u32>,                // Sequence number (SEQUENCE)
+    pub created: Option<DateTime<Utc>>,       // Creation time (CREATED)
+    pub last_modified: Option<DateTime<Utc>>, // Last modified (LAST-MODIFIED)
+
     // Recurrence
-    pub rrule: Option<String>,                  // Recurrence rule (RRULE)
-    pub rdate: Vec<DateTime<Utc>>,              // Recurrence dates (RDATE)
-    pub exdate: Vec<DateTime<Utc>>,             // Exception dates (EXDATE)
-    pub recurrence_id: Option<DateTime<Utc>>,   // Recurrence ID (RECURRENCE-ID)
-    
+    pub rrule: Option<String>,                // Recurrence rule (RRULE)
+    pub rdate: Vec<DateTime<Utc>>,            // Recurrence dates (RDATE)
+    pub exdate: Vec<DateTime<Utc>>,           // Exception dates (EXDATE)
+    pub recurrence_id: Option<DateTime<Utc>>, // Recurrence ID (RECURRENCE-ID)
+
     // Alarms and attachments
-    pub alarms: Vec<VAlarm>,                    // VALARM components
-    pub attachments: Vec<Attachment>,           // Attachments (ATTACH)
-    
+    pub alarms: Vec<VAlarm>,          // VALARM components
+    pub attachments: Vec<Attachment>, // Attachments (ATTACH)
+
     // CalDAV specific (for implementation)
-    pub etag: Option<String>,                   // ETag for CalDAV
-    pub href: Option<String>,                   // Href for CalDAV
-    pub calendar_path: Option<String>,          // Calendar path
-    pub all_day: bool,                          // All-day event flag
+    pub etag: Option<String>,          // ETag for CalDAV
+    pub href: Option<String>,          // Href for CalDAV
+    pub calendar_path: Option<String>, // Calendar path
+    pub all_day: bool,                 // All-day event flag
 }
 
 impl VEvent {
@@ -129,7 +129,9 @@ impl VEvent {
 
     /// Helper method to get display title (summary or "Untitled Event")
     pub fn get_title(&self) -> String {
-        self.summary.clone().unwrap_or_else(|| "Untitled Event".to_string())
+        self.summary
+            .clone()
+            .unwrap_or_else(|| "Untitled Event".to_string())
     }
 
     /// Helper method to get start date for UI compatibility
@@ -151,7 +153,7 @@ impl VEvent {
     pub fn get_status_display(&self) -> &'static str {
         match &self.status {
             Some(EventStatus::Tentative) => "Tentative",
-            Some(EventStatus::Confirmed) => "Confirmed", 
+            Some(EventStatus::Confirmed) => "Confirmed",
             Some(EventStatus::Cancelled) => "Cancelled",
             None => "Confirmed", // Default
         }
@@ -180,4 +182,4 @@ impl VEvent {
             Some(p) => format!("Priority {}", p),
         }
     }
-}
+}

frontend/src/auth.rs

@@ -11,11 +11,22 @@ pub struct CalDAVLoginRequest {
     pub password: String,
 }
 
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct UserPreferencesResponse {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
 #[derive(Debug, Serialize, Deserialize)]
 pub struct AuthResponse {
     pub token: String,
+    pub session_token: String,
     pub username: String,
     pub server_url: String,
+    pub preferences: UserPreferencesResponse,
 }
 
 #[derive(Debug, Deserialize)]
@@ -34,14 +45,14 @@ impl AuthService {
         let base_url = option_env!("BACKEND_API_URL")
             .unwrap_or("http://localhost:3000/api")
             .to_string();
-        
+
         Self { base_url }
     }
 
     pub async fn login(&self, request: CalDAVLoginRequest) -> Result<AuthResponse, String> {
         self.post_json("/auth/login", &request).await
     }
-    
+
     // Helper method for POST requests with JSON body
     async fn post_json<T: Serialize, R: for<'de> Deserialize<'de>>(
         &self,
@@ -49,9 +60,9 @@ impl AuthService {
         body: &T,
     ) -> Result<R, String> {
         let window = web_sys::window().ok_or("No global window exists")?;
-        
-        let json_body = serde_json::to_string(body)
-            .map_err(|e| format!("JSON serialization failed: {}", e))?;
+
+        let json_body =
+            serde_json::to_string(body).map_err(|e| format!("JSON serialization failed: {}", e))?;
 
         let opts = RequestInit::new();
         opts.set_method("POST");
@@ -62,23 +73,27 @@ impl AuthService {
         let request = Request::new_with_str_and_init(&url, &opts)
             .map_err(|e| format!("Request creation failed: {:?}", e))?;
 
-        request.headers().set("Content-Type", "application/json")
+        request
+            .headers()
+            .set("Content-Type", "application/json")
             .map_err(|e| format!("Header setting failed: {:?}", e))?;
 
         let resp_value = JsFuture::from(window.fetch_with_request(&request))
             .await
             .map_err(|e| format!("Network request failed: {:?}", e))?;
 
-        let resp: Response = resp_value.dyn_into()
+        let resp: Response = resp_value
+            .dyn_into()
             .map_err(|e| format!("Response cast failed: {:?}", e))?;
 
-        let text = JsFuture::from(resp.text()
-            .map_err(|e| format!("Text extraction failed: {:?}", e))?)
-            .await
-            .map_err(|e| format!("Text promise failed: {:?}", e))?;
+        let text = JsFuture::from(
+            resp.text()
+                .map_err(|e| format!("Text extraction failed: {:?}", e))?,
+        )
+        .await
+        .map_err(|e| format!("Text promise failed: {:?}", e))?;
 
-        let text_string = text.as_string()
-            .ok_or("Response text is not a string")?;
+        let text_string = text.as_string().ok_or("Response text is not a string")?;
 
         if resp.ok() {
             serde_json::from_str::<R>(&text_string)
@@ -92,4 +107,4 @@ impl AuthService {
             }
         }
     }
-}
+}

frontend/src/components/calendar.rs

@@ -1,19 +1,16 @@
-use yew::prelude::*;
-use chrono::{Datelike, Local, NaiveDate, Duration};
+use crate::components::{
+    CalendarHeader, CreateEventModal, EventCreationData, EventModal, MonthView, ViewMode, WeekView,
+};
+use crate::models::ical::VEvent;
+use crate::services::{calendar_service::UserInfo, CalendarService};
+use chrono::{Datelike, Duration, Local, NaiveDate};
+use gloo_storage::{LocalStorage, Storage};
 use std::collections::HashMap;
 use web_sys::MouseEvent;
-use crate::services::calendar_service::UserInfo;
-use crate::models::ical::VEvent;
-use crate::components::{EventModal, ViewMode, CalendarHeader, MonthView, WeekView, CreateEventModal, EventCreationData};
-use gloo_storage::{LocalStorage, Storage};
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarProps {
-    #[prop_or_default]
-    pub events: HashMap<NaiveDate, Vec<VEvent>>,
-    pub on_event_click: Callback<VEvent>,
-    #[prop_or_default]
-    pub refreshing_event_uid: Option<String>,
     #[prop_or_default]
     pub user_info: Option<UserInfo>,
     #[prop_or_default]
@@ -25,7 +22,17 @@ pub struct CalendarProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update_request: Option<Callback<(VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update_request: Option<
+        Callback<(
+            VEvent,
+            chrono::NaiveDateTime,
+            chrono::NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
 }
@@ -33,6 +40,12 @@ pub struct CalendarProps {
 #[function_component]
 pub fn Calendar(props: &CalendarProps) -> Html {
     let today = Local::now().date_naive();
+    
+    // Event management state
+    let events = use_state(|| HashMap::<NaiveDate, Vec<VEvent>>::new());
+    let loading = use_state(|| true);
+    let error = use_state(|| None::<String>);
+    let refreshing_event_uid = use_state(|| None::<String>);
     // Track the currently selected date (the actual day the user has selected)
     let selected_date = use_state(|| {
         // Try to load saved selected date from localStorage
@@ -55,20 +68,19 @@ pub fn Calendar(props: &CalendarProps) -> Html {
             }
         }
     });
-    
+
     // Track the display date (what to show in the view)
-    let current_date = use_state(|| {
-        match props.view {
-            ViewMode::Month => selected_date.with_day(1).unwrap_or(*selected_date),
-            ViewMode::Week => *selected_date,
-        }
+    let current_date = use_state(|| match props.view {
+        ViewMode::Month => selected_date.with_day(1).unwrap_or(*selected_date),
+        ViewMode::Week => *selected_date,
     });
     let selected_event = use_state(|| None::<VEvent>);
-    
+
     // State for create event modal
     let show_create_modal = use_state(|| false);
-    let create_event_data = use_state(|| None::<(chrono::NaiveDate, chrono::NaiveTime, chrono::NaiveTime)>);
-    
+    let create_event_data =
+        use_state(|| None::<(chrono::NaiveDate, chrono::NaiveTime, chrono::NaiveTime)>);
+
     // State for time increment snapping (15 or 30 minutes)
     let time_increment = use_state(|| {
         // Try to load saved time increment from localStorage
@@ -82,7 +94,155 @@ pub fn Calendar(props: &CalendarProps) -> Html {
             15
         }
     });
-    
+
+    // Fetch events when current_date changes
+    {
+        let events = events.clone();
+        let loading = loading.clone();
+        let error = error.clone();
+        let current_date = current_date.clone();
+        
+        use_effect_with((*current_date, props.view.clone()), move |(date, _view)| {
+            let auth_token: Option<String> = LocalStorage::get("auth_token").ok();
+            let date = *date; // Clone the date to avoid lifetime issues
+            
+            if let Some(token) = auth_token {
+                let events = events.clone();
+                let loading = loading.clone();
+                let error = error.clone();
+                
+                wasm_bindgen_futures::spawn_local(async move {
+                    let calendar_service = CalendarService::new();
+
+                    let password = if let Ok(credentials_str) =
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
+                            credentials["password"].as_str().unwrap_or("").to_string()
+                        } else {
+                            String::new()
+                        }
+                    } else {
+                        String::new()
+                    };
+
+                    let current_year = date.year();
+                    let current_month = date.month();
+
+                    match calendar_service
+                        .fetch_events_for_month_vevent(
+                            &token,
+                            &password,
+                            current_year,
+                            current_month,
+                        )
+                        .await
+                    {
+                        Ok(vevents) => {
+                            let grouped_events = CalendarService::group_events_by_date(vevents);
+                            events.set(grouped_events);
+                            loading.set(false);
+                        }
+                        Err(err) => {
+                            error.set(Some(format!("Failed to load events: {}", err)));
+                            loading.set(false);
+                        }
+                    }
+                });
+            } else {
+                loading.set(false);
+                error.set(Some("No authentication token found".to_string()));
+            }
+
+            || ()
+        });
+    }
+
+    // Handle event click to refresh individual events
+    let on_event_click = {
+        let events = events.clone();
+        let refreshing_event_uid = refreshing_event_uid.clone();
+        
+        Callback::from(move |event: VEvent| {
+            let auth_token: Option<String> = LocalStorage::get("auth_token").ok();
+            
+            if let Some(token) = auth_token {
+                let events = events.clone();
+                let refreshing_event_uid = refreshing_event_uid.clone();
+                let uid = event.uid.clone();
+
+                refreshing_event_uid.set(Some(uid.clone()));
+
+                wasm_bindgen_futures::spawn_local(async move {
+                    let calendar_service = CalendarService::new();
+
+                    let password = if let Ok(credentials_str) =
+                        LocalStorage::get::<String>("caldav_credentials")
+                    {
+                        if let Ok(credentials) =
+                            serde_json::from_str::<serde_json::Value>(&credentials_str)
+                        {
+                            credentials["password"].as_str().unwrap_or("").to_string()
+                        } else {
+                            String::new()
+                        }
+                    } else {
+                        String::new()
+                    };
+
+                    match calendar_service
+                        .refresh_event(&token, &password, &uid)
+                        .await
+                    {
+                        Ok(Some(refreshed_event)) => {
+                            let refreshed_vevent = refreshed_event;
+                            let mut updated_events = (*events).clone();
+
+                            for (_, day_events) in updated_events.iter_mut() {
+                                day_events.retain(|e| e.uid != uid);
+                            }
+
+                            if refreshed_vevent.rrule.is_some() {
+                                let new_occurrences =
+                                    CalendarService::expand_recurring_events(vec![
+                                        refreshed_vevent.clone(),
+                                    ]);
+
+                                for occurrence in new_occurrences {
+                                    let date = occurrence.get_date();
+                                    updated_events
+                                        .entry(date)
+                                        .or_insert_with(Vec::new)
+                                        .push(occurrence);
+                                }
+                            } else {
+                                let date = refreshed_vevent.get_date();
+                                updated_events
+                                    .entry(date)
+                                    .or_insert_with(Vec::new)
+                                    .push(refreshed_vevent);
+                            }
+
+                            events.set(updated_events);
+                        }
+                        Ok(None) => {
+                            let mut updated_events = (*events).clone();
+                            for (_, day_events) in updated_events.iter_mut() {
+                                day_events.retain(|e| e.uid != uid);
+                            }
+                            events.set(updated_events);
+                        }
+                        Err(_err) => {}
+                    }
+
+                    refreshing_event_uid.set(None);
+                });
+            }
+        })
+    };
+
     // Handle view mode changes - adjust current_date format when switching between month/week
     {
         let current_date = current_date.clone();
@@ -98,7 +258,7 @@ pub fn Calendar(props: &CalendarProps) -> Html {
             || {}
         });
     }
-    
+
     let on_prev = {
         let current_date = current_date.clone();
         let selected_date = selected_date.clone();
@@ -110,19 +270,22 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     let prev_month = *current_date - Duration::days(1);
                     let first_of_prev = prev_month.with_day(1).unwrap();
                     (first_of_prev, first_of_prev)
-                },
+                }
                 ViewMode::Week => {
                     // Go to previous week
                     let prev_week = *selected_date - Duration::weeks(1);
                     (prev_week, prev_week)
-                },
+                }
             };
             selected_date.set(new_selected);
             current_date.set(new_display);
-            let _ = LocalStorage::set("calendar_selected_date", new_selected.format("%Y-%m-%d").to_string());
+            let _ = LocalStorage::set(
+                "calendar_selected_date",
+                new_selected.format("%Y-%m-%d").to_string(),
+            );
         })
     };
-    
+
     let on_next = {
         let current_date = current_date.clone();
         let selected_date = selected_date.clone();
@@ -134,19 +297,23 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     let next_month = if current_date.month() == 12 {
                         NaiveDate::from_ymd_opt(current_date.year() + 1, 1, 1).unwrap()
                     } else {
-                        NaiveDate::from_ymd_opt(current_date.year(), current_date.month() + 1, 1).unwrap()
+                        NaiveDate::from_ymd_opt(current_date.year(), current_date.month() + 1, 1)
+                            .unwrap()
                     };
                     (next_month, next_month)
-                },
+                }
                 ViewMode::Week => {
                     // Go to next week
                     let next_week = *selected_date + Duration::weeks(1);
                     (next_week, next_week)
-                },
+                }
             };
             selected_date.set(new_selected);
             current_date.set(new_display);
-            let _ = LocalStorage::set("calendar_selected_date", new_selected.format("%Y-%m-%d").to_string());
+            let _ = LocalStorage::set(
+                "calendar_selected_date",
+                new_selected.format("%Y-%m-%d").to_string(),
+            );
         })
     };
 
@@ -160,15 +327,18 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                 ViewMode::Month => {
                     let first_of_today = today.with_day(1).unwrap();
                     (today, first_of_today) // Select today, but display the month
-                },
+                }
                 ViewMode::Week => (today, today), // Select and display today
             };
             selected_date.set(new_selected);
             current_date.set(new_display);
-            let _ = LocalStorage::set("calendar_selected_date", new_selected.format("%Y-%m-%d").to_string());
+            let _ = LocalStorage::set(
+                "calendar_selected_date",
+                new_selected.format("%Y-%m-%d").to_string(),
+            );
         })
     };
-    
+
     // Handle time increment toggle
     let on_time_increment_toggle = {
         let time_increment = time_increment.clone();
@@ -179,32 +349,68 @@ pub fn Calendar(props: &CalendarProps) -> Html {
             let _ = LocalStorage::set("calendar_time_increment", next);
         })
     };
-    
+
     // Handle drag-to-create event
     let on_create_event = {
         let show_create_modal = show_create_modal.clone();
         let create_event_data = create_event_data.clone();
-        Callback::from(move |(_date, start_datetime, end_datetime): (NaiveDate, chrono::NaiveDateTime, chrono::NaiveDateTime)| {
-            // For drag-to-create, we don't need the temporary event approach
-            // Instead, just pass the local times directly via initial_time props
-            create_event_data.set(Some((start_datetime.date(), start_datetime.time(), end_datetime.time())));
-            show_create_modal.set(true);
-        })
+        Callback::from(
+            move |(_date, start_datetime, end_datetime): (
+                NaiveDate,
+                chrono::NaiveDateTime,
+                chrono::NaiveDateTime,
+            )| {
+                // For drag-to-create, we don't need the temporary event approach
+                // Instead, just pass the local times directly via initial_time props
+                create_event_data.set(Some((
+                    start_datetime.date(),
+                    start_datetime.time(),
+                    end_datetime.time(),
+                )));
+                show_create_modal.set(true);
+            },
+        )
     };
-    
+
     // Handle drag-to-move event
     let on_event_update = {
         let on_event_update_request = props.on_event_update_request.clone();
-        Callback::from(move |(event, new_start, new_end, preserve_rrule, until_date, update_scope, occurrence_date): (VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)| {
-            if let Some(callback) = &on_event_update_request {
-                callback.emit((event, new_start, new_end, preserve_rrule, until_date, update_scope, occurrence_date));
-            }
-        })
+        Callback::from(
+            move |(
+                event,
+                new_start,
+                new_end,
+                preserve_rrule,
+                until_date,
+                update_scope,
+                occurrence_date,
+            ): (
+                VEvent,
+                chrono::NaiveDateTime,
+                chrono::NaiveDateTime,
+                bool,
+                Option<chrono::DateTime<chrono::Utc>>,
+                Option<String>,
+                Option<String>,
+            )| {
+                if let Some(callback) = &on_event_update_request {
+                    callback.emit((
+                        event,
+                        new_start,
+                        new_end,
+                        preserve_rrule,
+                        until_date,
+                        update_scope,
+                        occurrence_date,
+                    ));
+                }
+            },
+        )
     };
 
     html! {
         <div class={classes!("calendar", match props.view { ViewMode::Week => Some("week-view"), _ => None })}>
-            <CalendarHeader 
+            <CalendarHeader
                 current_date={*current_date}
                 view_mode={props.view.clone()}
                 on_prev={on_prev}
@@ -213,9 +419,22 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                 time_increment={Some(*time_increment)}
                 on_time_increment_toggle={Some(on_time_increment_toggle)}
             />
-            
+
             {
-                match props.view {
+                if *loading {
+                    html! {
+                        <div class="calendar-loading">
+                            <p>{"Loading calendar events..."}</p>
+                        </div>
+                    }
+                } else if let Some(err) = (*error).clone() {
+                    html! {
+                        <div class="calendar-error">
+                            <p>{format!("Error: {}", err)}</p>
+                        </div>
+                    }
+                } else {
+                    match props.view {
                     ViewMode::Month => {
                         let on_day_select = {
                             let selected_date = selected_date.clone();
@@ -224,14 +443,14 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                                 let _ = LocalStorage::set("calendar_selected_date", date.format("%Y-%m-%d").to_string());
                             })
                         };
-                        
+
                         html! {
                             <MonthView
                                 current_month={*current_date}
                                 today={today}
-                                events={props.events.clone()}
-                                on_event_click={props.on_event_click.clone()}
-                                refreshing_event_uid={props.refreshing_event_uid.clone()}
+                                events={(*events).clone()}
+                                on_event_click={on_event_click.clone()}
+                                refreshing_event_uid={(*refreshing_event_uid).clone()}
                                 user_info={props.user_info.clone()}
                                 on_event_context_menu={props.on_event_context_menu.clone()}
                                 on_calendar_context_menu={props.on_calendar_context_menu.clone()}
@@ -244,9 +463,9 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                         <WeekView
                             current_date={*current_date}
                             today={today}
-                            events={props.events.clone()}
-                            on_event_click={props.on_event_click.clone()}
-                            refreshing_event_uid={props.refreshing_event_uid.clone()}
+                            events={(*events).clone()}
+                            on_event_click={on_event_click.clone()}
+                            refreshing_event_uid={(*refreshing_event_uid).clone()}
                             user_info={props.user_info.clone()}
                             on_event_context_menu={props.on_event_context_menu.clone()}
                             on_calendar_context_menu={props.on_calendar_context_menu.clone()}
@@ -257,11 +476,12 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                             time_increment={*time_increment}
                         />
                     },
+                    }
                 }
             }
-            
+
             // Event details modal
-            <EventModal 
+            <EventModal
                 event={(*selected_event).clone()}
                 on_close={{
                     let selected_event_clone = selected_event.clone();
@@ -270,7 +490,7 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     })
                 }}
             />
-            
+
             // Create event modal
             <CreateEventModal
                 is_open={*show_create_modal}
@@ -294,7 +514,7 @@ pub fn Calendar(props: &CalendarProps) -> Html {
                     Callback::from(move |event_data: EventCreationData| {
                         show_create_modal.set(false);
                         create_event_data.set(None);
-                        
+
                         // Emit the create event request to parent
                         if let Some(callback) = &on_create_event_request {
                             callback.emit(event_data);
@@ -313,4 +533,4 @@ pub fn Calendar(props: &CalendarProps) -> Html {
             />
         </div>
     }
-}
+}

frontend/src/components/calendar_context_menu.rs

@@ -1,5 +1,5 @@
-use yew::prelude::*;
 use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarContextMenuProps {
@@ -13,7 +13,7 @@ pub struct CalendarContextMenuProps {
 #[function_component(CalendarContextMenu)]
 pub fn calendar_context_menu(props: &CalendarContextMenuProps) -> Html {
     let menu_ref = use_node_ref();
-    
+
     if !props.is_open {
         return html! {};
     }
@@ -33,9 +33,9 @@ pub fn calendar_context_menu(props: &CalendarContextMenuProps) -> Html {
     };
 
     html! {
-        <div 
+        <div
             ref={menu_ref}
-            class="context-menu" 
+            class="context-menu"
             style={style}
         >
             <div class="context-menu-item context-menu-create" onclick={on_create_event_click}>
@@ -44,4 +44,4 @@ pub fn calendar_context_menu(props: &CalendarContextMenuProps) -> Html {
             </div>
         </div>
     }
-}
+}

frontend/src/components/calendar_header.rs

@@ -1,7 +1,7 @@
-use yew::prelude::*;
-use chrono::{NaiveDate, Datelike};
 use crate::components::ViewMode;
+use chrono::{Datelike, NaiveDate};
 use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarHeaderProps {
@@ -18,7 +18,11 @@ pub struct CalendarHeaderProps {
 
 #[function_component(CalendarHeader)]
 pub fn calendar_header(props: &CalendarHeaderProps) -> Html {
-    let title = format!("{} {}", get_month_name(props.current_date.month()), props.current_date.year());
+    let title = format!(
+        "{} {}",
+        get_month_name(props.current_date.month()),
+        props.current_date.year()
+    );
 
     html! {
         <div class="calendar-header">
@@ -48,7 +52,7 @@ pub fn calendar_header(props: &CalendarHeaderProps) -> Html {
 fn get_month_name(month: u32) -> &'static str {
     match month {
         1 => "January",
-        2 => "February", 
+        2 => "February",
         3 => "March",
         4 => "April",
         5 => "May",
@@ -59,6 +63,6 @@ fn get_month_name(month: u32) -> &'static str {
         10 => "October",
         11 => "November",
         12 => "December",
-        _ => "Invalid"
+        _ => "Invalid",
     }
-}
+}

frontend/src/components/calendar_list_item.rs

@@ -1,13 +1,13 @@
-use yew::prelude::*;
-use web_sys::MouseEvent;
 use crate::services::calendar_service::CalendarInfo;
+use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct CalendarListItemProps {
     pub calendar: CalendarInfo,
     pub color_picker_open: bool,
     pub on_color_change: Callback<(String, String)>, // (calendar_path, color)
-    pub on_color_picker_toggle: Callback<String>, // calendar_path
+    pub on_color_picker_toggle: Callback<String>,    // calendar_path
     pub available_colors: Vec<String>,
     pub on_context_menu: Callback<(MouseEvent, String)>, // (event, calendar_path)
 }
@@ -34,7 +34,7 @@ pub fn calendar_list_item(props: &CalendarListItemProps) -> Html {
 
     html! {
         <li key={props.calendar.path.clone()} oncontextmenu={on_context_menu}>
-            <span class="calendar-color" 
+            <span class="calendar-color"
                   style={format!("background-color: {}", props.calendar.color)}
                   onclick={on_color_click}>
                 {
@@ -46,14 +46,14 @@ pub fn calendar_list_item(props: &CalendarListItemProps) -> Html {
                                         let color_str = color.clone();
                                         let cal_path = props.calendar.path.clone();
                                         let on_color_change = props.on_color_change.clone();
-                                        
+
                                         let on_color_select = Callback::from(move |_: MouseEvent| {
                                             on_color_change.emit((cal_path.clone(), color_str.clone()));
                                         });
-                                        
+
                                         let is_selected = props.calendar.color == *color;
                                         let class_name = if is_selected { "color-option selected" } else { "color-option" };
-                                        
+
                                         html! {
                                             <div class={class_name}
                                                  style={format!("background-color: {}", color)}
@@ -72,4 +72,4 @@ pub fn calendar_list_item(props: &CalendarListItemProps) -> Html {
             <span class="calendar-name">{&props.calendar.display_name}</span>
         </li>
     }
-}
+}

frontend/src/components/context_menu.rs

@@ -1,5 +1,5 @@
-use yew::prelude::*;
 use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct ContextMenuProps {
@@ -13,7 +13,7 @@ pub struct ContextMenuProps {
 #[function_component(ContextMenu)]
 pub fn context_menu(props: &ContextMenuProps) -> Html {
     let menu_ref = use_node_ref();
-    
+
     // Close menu when clicking outside (handled by parent component)
 
     if !props.is_open {
@@ -35,9 +35,9 @@ pub fn context_menu(props: &ContextMenuProps) -> Html {
     };
 
     html! {
-        <div 
+        <div
             ref={menu_ref}
-            class="context-menu" 
+            class="context-menu"
             style={style}
         >
             <div class="context-menu-item context-menu-delete" onclick={on_delete_click}>
@@ -45,4 +45,4 @@ pub fn context_menu(props: &ContextMenuProps) -> Html {
             </div>
         </div>
     }
-}
+}

frontend/src/components/create_calendar_modal.rs

@@ -39,30 +39,32 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
         let error_message = error_message.clone();
         let is_creating = is_creating.clone();
         let on_create = props.on_create.clone();
-        
+
         Callback::from(move |e: SubmitEvent| {
             e.prevent_default();
-            
+
             let name = (*calendar_name).trim();
             if name.is_empty() {
                 error_message.set(Some("Calendar name is required".to_string()));
                 return;
             }
-            
+
             if name.len() > 100 {
-                error_message.set(Some("Calendar name too long (max 100 characters)".to_string()));
+                error_message.set(Some(
+                    "Calendar name too long (max 100 characters)".to_string(),
+                ));
                 return;
             }
-            
+
             error_message.set(None);
             is_creating.set(true);
-            
+
             let desc = if (*description).trim().is_empty() {
                 None
             } else {
                 Some((*description).clone())
             };
-            
+
             on_create.emit((name.to_string(), desc, (*selected_color).clone()));
         })
     };
@@ -90,7 +92,7 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
                         {"×"}
                     </button>
                 </div>
-                
+
                 <form class="modal-body" onsubmit={on_submit}>
                     {
                         if let Some(ref error) = *error_message {
@@ -103,10 +105,10 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
                             html! {}
                         }
                     }
-                    
+
                     <div class="form-group">
                         <label for="calendar-name">{"Calendar Name *"}</label>
-                        <input 
+                        <input
                             id="calendar-name"
                             type="text"
                             value={(*calendar_name).clone()}
@@ -116,7 +118,7 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
                             disabled={*is_creating}
                         />
                     </div>
-                    
+
                     <div class="form-group">
                         <label for="calendar-description">{"Description"}</label>
                         <textarea
@@ -128,7 +130,7 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
                             disabled={*is_creating}
                         />
                     </div>
-                    
+
                     <div class="form-group">
                         <label>{"Calendar Color"}</label>
                         <div class="color-grid">
@@ -143,13 +145,13 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
                                             selected_color.set(Some(color.clone()));
                                         })
                                     };
-                                    
-                                    let class_name = if is_selected { 
-                                        "color-option selected" 
-                                    } else { 
-                                        "color-option" 
+
+                                    let class_name = if is_selected {
+                                        "color-option selected"
+                                    } else {
+                                        "color-option"
                                     };
-                                    
+
                                     html! {
                                         <button
                                             key={index}
@@ -165,18 +167,18 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
                         </div>
                         <p class="color-help-text">{"Optional: Choose a color for your calendar"}</p>
                     </div>
-                    
+
                     <div class="modal-actions">
-                        <button 
-                            type="button" 
+                        <button
+                            type="button"
                             class="cancel-button"
                             onclick={props.on_close.reform(|_| ())}
                             disabled={*is_creating}
                         >
                             {"Cancel"}
                         </button>
-                        <button 
-                            type="submit" 
+                        <button
+                            type="submit"
                             class="create-button"
                             disabled={*is_creating}
                         >
@@ -193,4 +195,4 @@ pub fn CreateCalendarModal(props: &CreateCalendarModalProps) -> Html {
             </div>
         </div>
     }
-}
+}

frontend/src/components/event_context_menu.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use web_sys::MouseEvent;
 use crate::models::ical::VEvent;
+use web_sys::MouseEvent;
+use yew::prelude::*;
 
 #[derive(Clone, PartialEq, Debug)]
 pub enum DeleteAction {
@@ -30,7 +30,7 @@ pub struct EventContextMenuProps {
 #[function_component(EventContextMenu)]
 pub fn event_context_menu(props: &EventContextMenuProps) -> Html {
     let menu_ref = use_node_ref();
-    
+
     if !props.is_open {
         return html! {};
     }
@@ -41,7 +41,9 @@ pub fn event_context_menu(props: &EventContextMenuProps) -> Html {
     );
 
     // Check if the event is recurring
-    let is_recurring = props.event.as_ref()
+    let is_recurring = props
+        .event
+        .as_ref()
         .map(|event| event.rrule.is_some())
         .unwrap_or(false);
 
@@ -64,9 +66,9 @@ pub fn event_context_menu(props: &EventContextMenuProps) -> Html {
     };
 
     html! {
-        <div 
+        <div
             ref={menu_ref}
-            class="context-menu" 
+            class="context-menu"
             style={style}
         >
             {
@@ -117,4 +119,4 @@ pub fn event_context_menu(props: &EventContextMenuProps) -> Html {
             }
         </div>
     }
-}
+}

frontend/src/components/event_modal.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use chrono::{DateTime, Utc};
 use crate::models::ical::VEvent;
+use chrono::{DateTime, Utc};
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct EventModalProps {
@@ -16,7 +16,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
             on_close.emit(());
         })
     };
-    
+
     let backdrop_click = {
         let on_close = props.on_close.clone();
         Callback::from(move |e: MouseEvent| {
@@ -39,7 +39,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                             <strong>{"Title:"}</strong>
                             <span>{event.get_title()}</span>
                         </div>
-                        
+
                         {
                             if let Some(ref description) = event.description {
                                 html! {
@@ -52,12 +52,12 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         <div class="event-detail">
                             <strong>{"Start:"}</strong>
                             <span>{format_datetime(&event.dtstart, event.all_day)}</span>
                         </div>
-                        
+
                         {
                             if let Some(ref end) = event.dtend {
                                 html! {
@@ -70,12 +70,12 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         <div class="event-detail">
                             <strong>{"All Day:"}</strong>
                             <span>{if event.all_day { "Yes" } else { "No" }}</span>
                         </div>
-                        
+
                         {
                             if let Some(ref location) = event.location {
                                 html! {
@@ -88,22 +88,22 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         <div class="event-detail">
                             <strong>{"Status:"}</strong>
                             <span>{event.get_status_display()}</span>
                         </div>
-                        
+
                         <div class="event-detail">
                             <strong>{"Privacy:"}</strong>
                             <span>{event.get_class_display()}</span>
                         </div>
-                        
+
                         <div class="event-detail">
                             <strong>{"Priority:"}</strong>
                             <span>{event.get_priority_display()}</span>
                         </div>
-                        
+
                         {
                             if let Some(ref organizer) = event.organizer {
                                 html! {
@@ -116,7 +116,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         {
                             if !event.attendees.is_empty() {
                                 html! {
@@ -129,7 +129,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         {
                             if !event.categories.is_empty() {
                                 html! {
@@ -142,7 +142,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         {
                             if let Some(ref recurrence) = event.rrule {
                                 html! {
@@ -160,7 +160,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 }
                             }
                         }
-                        
+
                         {
                             if !event.alarms.is_empty() {
                                 html! {
@@ -178,7 +178,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 }
                             }
                         }
-                        
+
                         {
                             if let Some(ref created) = event.created {
                                 html! {
@@ -191,7 +191,7 @@ pub fn EventModal(props: &EventModalProps) -> Html {
                                 html! {}
                             }
                         }
-                        
+
                         {
                             if let Some(ref modified) = event.last_modified {
                                 html! {
@@ -236,4 +236,3 @@ fn format_recurrence_rule(rrule: &str) -> String {
         format!("Custom ({})", rrule)
     }
 }
-

frontend/src/components/login.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use web_sys::HtmlInputElement;
 use gloo_storage::{LocalStorage, Storage};
+use web_sys::HtmlInputElement;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct LoginProps {
@@ -9,11 +9,20 @@ pub struct LoginProps {
 
 #[function_component]
 pub fn Login(props: &LoginProps) -> Html {
-    let server_url = use_state(String::new);
-    let username = use_state(String::new);
+    // Load remembered values from LocalStorage on mount
+    let server_url = use_state(|| {
+        LocalStorage::get::<String>("remembered_server_url").unwrap_or_default()
+    });
+    let username = use_state(|| {
+        LocalStorage::get::<String>("remembered_username").unwrap_or_default()
+    });
     let password = use_state(String::new);
     let error_message = use_state(|| Option::<String>::None);
     let is_loading = use_state(|| false);
+    
+    // Remember checkboxes state - default to checked
+    let remember_server = use_state(|| true);
+    let remember_username = use_state(|| true);
 
     let server_url_ref = use_node_ref();
     let username_ref = use_node_ref();
@@ -42,6 +51,38 @@ pub fn Login(props: &LoginProps) -> Html {
             password.set(target.value());
         })
     };
+    
+    let on_remember_server_change = {
+        let remember_server = remember_server.clone();
+        let server_url = server_url.clone();
+        Callback::from(move |e: Event| {
+            let target = e.target_unchecked_into::<HtmlInputElement>();
+            let checked = target.checked();
+            remember_server.set(checked);
+            
+            if checked {
+                let _ = LocalStorage::set("remembered_server_url", (*server_url).clone());
+            } else {
+                let _ = LocalStorage::delete("remembered_server_url");
+            }
+        })
+    };
+    
+    let on_remember_username_change = {
+        let remember_username = remember_username.clone();
+        let username = username.clone();
+        Callback::from(move |e: Event| {
+            let target = e.target_unchecked_into::<HtmlInputElement>();
+            let checked = target.checked();
+            remember_username.set(checked);
+            
+            if checked {
+                let _ = LocalStorage::set("remembered_username", (*username).clone());
+            } else {
+                let _ = LocalStorage::delete("remembered_username");
+            }
+        })
+    };
 
     let on_submit = {
         let server_url = server_url.clone();
@@ -53,7 +94,7 @@ pub fn Login(props: &LoginProps) -> Html {
 
         Callback::from(move |e: SubmitEvent| {
             e.prevent_default();
-            
+
             let server_url = (*server_url).clone();
             let username = (*username).clone();
             let password = (*password).clone();
@@ -73,11 +114,18 @@ pub fn Login(props: &LoginProps) -> Html {
             wasm_bindgen_futures::spawn_local(async move {
                 web_sys::console::log_1(&"🚀 Starting login process...".into());
                 match perform_login(server_url.clone(), username.clone(), password.clone()).await {
-                    Ok((token, credentials)) => {
+                    Ok((token, session_token, credentials, preferences)) => {
                         web_sys::console::log_1(&"✅ Login successful!".into());
                         // Store token and credentials in local storage
                         if let Err(_) = LocalStorage::set("auth_token", &token) {
-                            error_message.set(Some("Failed to store authentication token".to_string()));
+                            error_message
+                                .set(Some("Failed to store authentication token".to_string()));
+                            is_loading.set(false);
+                            return;
+                        }
+                        if let Err(_) = LocalStorage::set("session_token", &session_token) {
+                            error_message
+                                .set(Some("Failed to store session token".to_string()));
                             is_loading.set(false);
                             return;
                         }
@@ -87,6 +135,11 @@ pub fn Login(props: &LoginProps) -> Html {
                             return;
                         }
                         
+                        // Store preferences from database
+                        if let Ok(prefs_json) = serde_json::to_string(&preferences) {
+                            let _ = LocalStorage::set("user_preferences", &prefs_json);
+                        }
+
                         is_loading.set(false);
                         on_login.emit(token);
                     }
@@ -116,6 +169,15 @@ pub fn Login(props: &LoginProps) -> Html {
                             onchange={on_server_url_change}
                             disabled={*is_loading}
                         />
+                        <div class="remember-checkbox">
+                            <input
+                                type="checkbox"
+                                id="remember_server"
+                                checked={*remember_server}
+                                onchange={on_remember_server_change}
+                            />
+                            <label for="remember_server">{"Remember server"}</label>
+                        </div>
                     </div>
 
                     <div class="form-group">
@@ -129,6 +191,15 @@ pub fn Login(props: &LoginProps) -> Html {
                             onchange={on_username_change}
                             disabled={*is_loading}
                         />
+                        <div class="remember-checkbox">
+                            <input
+                                type="checkbox"
+                                id="remember_username"
+                                checked={*remember_username}
+                                onchange={on_remember_username_change}
+                            />
+                            <label for="remember_username">{"Remember username"}</label>
+                        </div>
                     </div>
 
                     <div class="form-group">
@@ -172,21 +243,25 @@ pub fn Login(props: &LoginProps) -> Html {
 }
 
 /// Perform login using the CalDAV auth service
-async fn perform_login(server_url: String, username: String, password: String) -> Result<(String, String), String> {
+async fn perform_login(
+    server_url: String,
+    username: String,
+    password: String,
+) -> Result<(String, String, String, serde_json::Value), String> {
     use crate::auth::{AuthService, CalDAVLoginRequest};
     use serde_json;
-    
+
     web_sys::console::log_1(&format!("📡 Creating auth service and request...").into());
-    
+
     let auth_service = AuthService::new();
-    let request = CalDAVLoginRequest { 
-        server_url: server_url.clone(), 
-        username: username.clone(), 
-        password: password.clone() 
+    let request = CalDAVLoginRequest {
+        server_url: server_url.clone(),
+        username: username.clone(),
+        password: password.clone(),
     };
-    
+
     web_sys::console::log_1(&format!("🚀 Sending login request to backend...").into());
-    
+
     match auth_service.login(request).await {
         Ok(response) => {
             web_sys::console::log_1(&format!("✅ Backend responded successfully").into());
@@ -196,11 +271,21 @@ async fn perform_login(server_url: String, username: String, password: String) -
                 "username": username,
                 "password": password
             });
-            Ok((response.token, credentials.to_string()))
-        },
+            
+            // Extract preferences as JSON
+            let preferences = serde_json::json!({
+                "calendar_selected_date": response.preferences.calendar_selected_date,
+                "calendar_time_increment": response.preferences.calendar_time_increment,
+                "calendar_view_mode": response.preferences.calendar_view_mode,
+                "calendar_theme": response.preferences.calendar_theme,
+                "calendar_colors": response.preferences.calendar_colors,
+            });
+            
+            Ok((response.token, response.session_token, credentials.to_string(), preferences))
+        }
         Err(err) => {
             web_sys::console::log_1(&format!("❌ Backend error: {}", err).into());
             Err(err)
-        },
+        }
     }
-}
+}

frontend/src/components/mod.rs

@@ -1,31 +1,33 @@
-pub mod login;
 pub mod calendar;
-pub mod calendar_header;
-pub mod month_view;
-pub mod week_view;
-pub mod event_modal;
-pub mod create_calendar_modal;
-pub mod context_menu;
-pub mod event_context_menu;
 pub mod calendar_context_menu;
-pub mod create_event_modal;
-pub mod sidebar;
+pub mod calendar_header;
 pub mod calendar_list_item;
-pub mod route_handler;
+pub mod context_menu;
+pub mod create_calendar_modal;
+pub mod create_event_modal;
+pub mod event_context_menu;
+pub mod event_modal;
+pub mod login;
+pub mod month_view;
 pub mod recurring_edit_modal;
+pub mod route_handler;
+pub mod sidebar;
+pub mod week_view;
 
-pub use login::Login;
 pub use calendar::Calendar;
-pub use calendar_header::CalendarHeader;
-pub use month_view::MonthView;
-pub use week_view::WeekView;
-pub use event_modal::EventModal;
-pub use create_calendar_modal::CreateCalendarModal;
-pub use context_menu::ContextMenu;
-pub use event_context_menu::{EventContextMenu, DeleteAction, EditAction};
 pub use calendar_context_menu::CalendarContextMenu;
-pub use create_event_modal::{CreateEventModal, EventCreationData, EventStatus, EventClass, ReminderType, RecurrenceType};
-pub use sidebar::{Sidebar, ViewMode, Theme};
+pub use calendar_header::CalendarHeader;
 pub use calendar_list_item::CalendarListItem;
+pub use context_menu::ContextMenu;
+pub use create_calendar_modal::CreateCalendarModal;
+pub use create_event_modal::{
+    CreateEventModal, EventClass, EventCreationData, EventStatus, RecurrenceType, ReminderType,
+};
+pub use event_context_menu::{DeleteAction, EditAction, EventContextMenu};
+pub use event_modal::EventModal;
+pub use login::Login;
+pub use month_view::MonthView;
+pub use recurring_edit_modal::{RecurringEditAction, RecurringEditModal};
 pub use route_handler::RouteHandler;
-pub use recurring_edit_modal::{RecurringEditModal, RecurringEditAction};
+pub use sidebar::{Sidebar, Theme, ViewMode};
+pub use week_view::WeekView;

frontend/src/components/month_view.rs

@@ -1,10 +1,10 @@
-use yew::prelude::*;
+use crate::models::ical::VEvent;
+use crate::services::calendar_service::UserInfo;
 use chrono::{Datelike, NaiveDate, Weekday};
 use std::collections::HashMap;
-use web_sys::window;
 use wasm_bindgen::{prelude::*, JsCast};
-use crate::services::calendar_service::UserInfo;
-use crate::models::ical::VEvent;
+use web_sys::window;
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct MonthViewProps {
@@ -52,30 +52,33 @@ pub fn month_view(props: &MonthViewProps) -> Html {
         let calculate_max_events = calculate_max_events.clone();
         use_effect_with((), move |_| {
             let calculate_max_events_clone = calculate_max_events.clone();
-            
+
             // Initial calculation with a slight delay to ensure DOM is ready
             if let Some(window) = window() {
                 let timeout_closure = Closure::wrap(Box::new(move || {
                     calculate_max_events_clone();
                 }) as Box<dyn FnMut()>);
-                
+
                 let _ = window.set_timeout_with_callback_and_timeout_and_arguments_0(
                     timeout_closure.as_ref().unchecked_ref(),
                     100,
                 );
                 timeout_closure.forget();
             }
-            
+
             // Setup resize listener
             let resize_closure = Closure::wrap(Box::new(move || {
                 calculate_max_events();
             }) as Box<dyn Fn()>);
-            
+
             if let Some(window) = window() {
-                let _ = window.add_event_listener_with_callback("resize", resize_closure.as_ref().unchecked_ref());
+                let _ = window.add_event_listener_with_callback(
+                    "resize",
+                    resize_closure.as_ref().unchecked_ref(),
+                );
                 resize_closure.forget(); // Keep the closure alive
             }
-            
+
             || {}
         });
     }
@@ -84,8 +87,11 @@ pub fn month_view(props: &MonthViewProps) -> Html {
     let get_event_color = |event: &VEvent| -> String {
         if let Some(user_info) = &props.user_info {
             if let Some(calendar_path) = &event.calendar_path {
-                if let Some(calendar) = user_info.calendars.iter()
-                    .find(|cal| &cal.path == calendar_path) {
+                if let Some(calendar) = user_info
+                    .calendars
+                    .iter()
+                    .find(|cal| &cal.path == calendar_path)
+                {
                     return calendar.color.clone();
                 }
             }
@@ -103,7 +109,7 @@ pub fn month_view(props: &MonthViewProps) -> Html {
             <div class="weekday-header">{"Thu"}</div>
             <div class="weekday-header">{"Fri"}</div>
             <div class="weekday-header">{"Sat"}</div>
-            
+
             // Days from previous month (grayed out)
             {
                 days_from_prev_month.iter().map(|day| {
@@ -112,7 +118,7 @@ pub fn month_view(props: &MonthViewProps) -> Html {
                     }
                 }).collect::<Html>()
             }
-            
+
             // Days of the current month
             {
                 (1..=days_in_month).map(|day| {
@@ -120,16 +126,16 @@ pub fn month_view(props: &MonthViewProps) -> Html {
                     let is_today = date == props.today;
                     let is_selected = props.selected_date == Some(date);
                     let day_events = props.events.get(&date).cloned().unwrap_or_default();
-                    
+
                     // Calculate visible events and overflow
                     let max_events = *max_events_per_day as usize;
                     let visible_events: Vec<_> = day_events.iter().take(max_events).collect();
                     let hidden_count = day_events.len().saturating_sub(max_events);
-                    
+
                     html! {
-                        <div 
+                        <div
                             class={classes!(
-                                "calendar-day", 
+                                "calendar-day",
                                 if is_today { Some("today") } else { None },
                                 if is_selected { Some("selected") } else { None }
                             )}
@@ -162,7 +168,7 @@ pub fn month_view(props: &MonthViewProps) -> Html {
                                     visible_events.iter().map(|event| {
                                         let event_color = get_event_color(event);
                                         let is_refreshing = props.refreshing_event_uid.as_ref() == Some(&event.uid);
-                                        
+
                                         let onclick = {
                                             let on_event_click = props.on_event_click.clone();
                                             let event = (*event).clone();
@@ -170,7 +176,7 @@ pub fn month_view(props: &MonthViewProps) -> Html {
                                                 on_event_click.emit(event.clone());
                                             })
                                         };
-                                        
+
                                         let oncontextmenu = {
                                             if let Some(callback) = &props.on_event_context_menu {
                                                 let callback = callback.clone();
@@ -183,9 +189,9 @@ pub fn month_view(props: &MonthViewProps) -> Html {
                                                 None
                                             }
                                         };
-                                        
+
                                         html! {
-                                            <div 
+                                            <div
                                                 class={classes!("event-box", if is_refreshing { Some("refreshing") } else { None })}
                                                 style={format!("background-color: {}", event_color)}
                                                 {onclick}
@@ -212,7 +218,7 @@ pub fn month_view(props: &MonthViewProps) -> Html {
                     }
                 }).collect::<Html>()
             }
-            
+
             { render_next_month_days(days_from_prev_month.len(), days_in_month) }
         </div>
     }
@@ -221,20 +227,34 @@ pub fn month_view(props: &MonthViewProps) -> Html {
 fn render_next_month_days(prev_days_count: usize, current_days_count: u32) -> Html {
     let total_slots = 42; // 6 rows x 7 days
     let used_slots = prev_days_count + current_days_count as usize;
-    let remaining_slots = if used_slots < total_slots { total_slots - used_slots } else { 0 };
-    
-    (1..=remaining_slots).map(|day| {
-        html! {
-            <div class="calendar-day next-month">{day}</div>
-        }
-    }).collect::<Html>()
+    let remaining_slots = if used_slots < total_slots {
+        total_slots - used_slots
+    } else {
+        0
+    };
+
+    (1..=remaining_slots)
+        .map(|day| {
+            html! {
+                <div class="calendar-day next-month">{day}</div>
+            }
+        })
+        .collect::<Html>()
 }
 
 fn get_days_in_month(date: NaiveDate) -> u32 {
     NaiveDate::from_ymd_opt(
-        if date.month() == 12 { date.year() + 1 } else { date.year() },
-        if date.month() == 12 { 1 } else { date.month() + 1 },
-        1
+        if date.month() == 12 {
+            date.year() + 1
+        } else {
+            date.year()
+        },
+        if date.month() == 12 {
+            1
+        } else {
+            date.month() + 1
+        },
+        1,
     )
     .unwrap()
     .pred_opt()
@@ -252,7 +272,7 @@ fn get_days_from_previous_month(current_month: NaiveDate, first_weekday: Weekday
         Weekday::Fri => 5,
         Weekday::Sat => 6,
     };
-    
+
     if days_before == 0 {
         vec![]
     } else {
@@ -261,8 +281,8 @@ fn get_days_from_previous_month(current_month: NaiveDate, first_weekday: Weekday
         } else {
             NaiveDate::from_ymd_opt(current_month.year(), current_month.month() - 1, 1).unwrap()
         };
-        
+
         let prev_month_days = get_days_in_month(prev_month);
         ((prev_month_days - days_before as u32 + 1)..=prev_month_days).collect()
     }
-}
+}

frontend/src/components/recurring_edit_modal.rs

@@ -1,6 +1,6 @@
-use yew::prelude::*;
-use chrono::NaiveDateTime;
 use crate::models::ical::VEvent;
+use chrono::NaiveDateTime;
+use yew::prelude::*;
 
 #[derive(Clone, PartialEq)]
 pub enum RecurringEditAction {
@@ -25,29 +25,34 @@ pub fn recurring_edit_modal(props: &RecurringEditModalProps) -> Html {
         return html! {};
     }
 
-    let event_title = props.event.summary.as_ref().map(|s| s.as_str()).unwrap_or("Untitled Event");
-    
+    let event_title = props
+        .event
+        .summary
+        .as_ref()
+        .map(|s| s.as_str())
+        .unwrap_or("Untitled Event");
+
     let on_this_event = {
         let on_choice = props.on_choice.clone();
         Callback::from(move |_| {
             on_choice.emit(RecurringEditAction::ThisEvent);
         })
     };
-    
+
     let on_future_events = {
         let on_choice = props.on_choice.clone();
         Callback::from(move |_| {
             on_choice.emit(RecurringEditAction::FutureEvents);
         })
     };
-    
+
     let on_all_events = {
         let on_choice = props.on_choice.clone();
         Callback::from(move |_| {
             on_choice.emit(RecurringEditAction::AllEvents);
         })
     };
-    
+
     let on_cancel = {
         let on_cancel = props.on_cancel.clone();
         Callback::from(move |_| {
@@ -64,18 +69,18 @@ pub fn recurring_edit_modal(props: &RecurringEditModalProps) -> Html {
                 <div class="modal-body">
                     <p>{format!("You're modifying \"{}\" which is part of a recurring series.", event_title)}</p>
                     <p>{"How would you like to apply this change?"}</p>
-                    
+
                     <div class="recurring-edit-options">
                         <button class="btn btn-primary recurring-option" onclick={on_this_event}>
                             <div class="option-title">{"This event only"}</div>
                             <div class="option-description">{"Change only this occurrence"}</div>
                         </button>
-                        
+
                         <button class="btn btn-primary recurring-option" onclick={on_future_events}>
                             <div class="option-title">{"This and future events"}</div>
                             <div class="option-description">{"Change this occurrence and all future occurrences"}</div>
                         </button>
-                        
+
                         <button class="btn btn-primary recurring-option" onclick={on_all_events}>
                             <div class="option-title">{"All events in series"}</div>
                             <div class="option-description">{"Change all occurrences in the series"}</div>
@@ -90,4 +95,4 @@ pub fn recurring_edit_modal(props: &RecurringEditModalProps) -> Html {
             </div>
         </div>
     }
-}
+}

frontend/src/components/route_handler.rs

@@ -1,8 +1,8 @@
+use crate::components::{Login, ViewMode};
+use crate::models::ical::VEvent;
+use crate::services::calendar_service::UserInfo;
 use yew::prelude::*;
 use yew_router::prelude::*;
-use crate::components::{Login, ViewMode};
-use crate::services::calendar_service::UserInfo;
-use crate::models::ical::VEvent;
 
 #[derive(Clone, Routable, PartialEq)]
 pub enum Route {
@@ -28,7 +28,17 @@ pub struct RouteHandlerProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<crate::components::EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update_request: Option<Callback<(VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update_request: Option<
+        Callback<(
+            VEvent,
+            chrono::NaiveDateTime,
+            chrono::NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
 }
@@ -44,7 +54,7 @@ pub fn route_handler(props: &RouteHandlerProps) -> Html {
     let on_create_event_request = props.on_create_event_request.clone();
     let on_event_update_request = props.on_event_update_request.clone();
     let context_menus_open = props.context_menus_open;
-    
+
     html! {
         <Switch<Route> render={move |route| {
             let auth_token = auth_token.clone();
@@ -56,7 +66,7 @@ pub fn route_handler(props: &RouteHandlerProps) -> Html {
             let on_create_event_request = on_create_event_request.clone();
             let on_event_update_request = on_event_update_request.clone();
             let context_menus_open = context_menus_open;
-            
+
             match route {
                 Route::Home => {
                     if auth_token.is_some() {
@@ -74,16 +84,16 @@ pub fn route_handler(props: &RouteHandlerProps) -> Html {
                 }
                 Route::Calendar => {
                     if auth_token.is_some() {
-                        html! { 
-                            <CalendarView 
-                                user_info={user_info} 
+                        html! {
+                            <CalendarView
+                                user_info={user_info}
                                 on_event_context_menu={on_event_context_menu}
                                 on_calendar_context_menu={on_calendar_context_menu}
                                 view={view}
                                 on_create_event_request={on_create_event_request}
                                 on_event_update_request={on_event_update_request}
                                 context_menus_open={context_menus_open}
-                            /> 
+                            />
                         }
                     } else {
                         html! { <Redirect<Route> to={Route::Login}/> }
@@ -106,192 +116,36 @@ pub struct CalendarViewProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<crate::components::EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update_request: Option<Callback<(VEvent, chrono::NaiveDateTime, chrono::NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update_request: Option<
+        Callback<(
+            VEvent,
+            chrono::NaiveDateTime,
+            chrono::NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
 }
 
-use gloo_storage::{LocalStorage, Storage};
-use crate::services::CalendarService;
 use crate::components::Calendar;
-use std::collections::HashMap;
-use chrono::{Local, NaiveDate, Datelike};
 
 #[function_component(CalendarView)]
 pub fn calendar_view(props: &CalendarViewProps) -> Html {
-    let events = use_state(|| HashMap::<NaiveDate, Vec<VEvent>>::new());
-    let loading = use_state(|| true);
-    let error = use_state(|| None::<String>);
-    let refreshing_event = use_state(|| None::<String>);
-    
-    let auth_token: Option<String> = LocalStorage::get("auth_token").ok();
-    
-    
-    let today = Local::now().date_naive();
-    let current_year = today.year();
-    let current_month = today.month();
-    
-    let on_event_click = {
-        let events = events.clone();
-        let refreshing_event = refreshing_event.clone();
-        let auth_token = auth_token.clone();
-        
-        Callback::from(move |event: VEvent| {
-            if let Some(token) = auth_token.clone() {
-                let events = events.clone();
-                let refreshing_event = refreshing_event.clone();
-                let uid = event.uid.clone();
-                
-                refreshing_event.set(Some(uid.clone()));
-                
-                wasm_bindgen_futures::spawn_local(async move {
-                    let calendar_service = CalendarService::new();
-                    
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
-                            credentials["password"].as_str().unwrap_or("").to_string()
-                        } else {
-                            String::new()
-                        }
-                    } else {
-                        String::new()
-                    };
-                    
-                    match calendar_service.refresh_event(&token, &password, &uid).await {
-                        Ok(Some(refreshed_event)) => {
-                            let refreshed_vevent = refreshed_event; // CalendarEvent is now VEvent
-                            let mut updated_events = (*events).clone();
-                            
-                            for (_, day_events) in updated_events.iter_mut() {
-                                day_events.retain(|e| e.uid != uid);
-                            }
-                            
-                            if refreshed_vevent.rrule.is_some() {
-                                let new_occurrences = CalendarService::expand_recurring_events(vec![refreshed_vevent.clone()]);
-                                
-                                for occurrence in new_occurrences {
-                                    let date = occurrence.get_date();
-                                    updated_events.entry(date)
-                                        .or_insert_with(Vec::new)
-                                        .push(occurrence);
-                                }
-                            } else {
-                                let date = refreshed_vevent.get_date();
-                                updated_events.entry(date)
-                                    .or_insert_with(Vec::new)
-                                    .push(refreshed_vevent);
-                            }
-                            
-                            events.set(updated_events);
-                        }
-                        Ok(None) => {
-                            let mut updated_events = (*events).clone();
-                            for (_, day_events) in updated_events.iter_mut() {
-                                day_events.retain(|e| e.uid != uid);
-                            }
-                            events.set(updated_events);
-                        }
-                        Err(_err) => {
-                        }
-                    }
-                    
-                    refreshing_event.set(None);
-                });
-            }
-        })
-    };
-    
-    {
-        let events = events.clone();
-        let loading = loading.clone();
-        let error = error.clone();
-        let auth_token = auth_token.clone();
-        
-        use_effect_with((), move |_| {
-            if let Some(token) = auth_token {
-                let events = events.clone();
-                let loading = loading.clone();
-                let error = error.clone();
-                
-                wasm_bindgen_futures::spawn_local(async move {
-                    let calendar_service = CalendarService::new();
-                    
-                    let password = if let Ok(credentials_str) = LocalStorage::get::<String>("caldav_credentials") {
-                        if let Ok(credentials) = serde_json::from_str::<serde_json::Value>(&credentials_str) {
-                            credentials["password"].as_str().unwrap_or("").to_string()
-                        } else {
-                            String::new()
-                        }
-                    } else {
-                        String::new()
-                    };
-                    
-                    match calendar_service.fetch_events_for_month_vevent(&token, &password, current_year, current_month).await {
-                        Ok(vevents) => {
-                            let grouped_events = CalendarService::group_events_by_date(vevents);
-                            events.set(grouped_events);
-                            loading.set(false);
-                        }
-                        Err(err) => {
-                            error.set(Some(format!("Failed to load events: {}", err)));
-                            loading.set(false);
-                        }
-                    }
-                });
-            } else {
-                loading.set(false);
-                error.set(Some("No authentication token found".to_string()));
-            }
-            
-            || ()
-        });
-    }
-    
     html! {
         <div class="calendar-view">
-            {
-                if *loading {
-                    html! {
-                        <div class="calendar-loading">
-                            <p>{"Loading calendar events..."}</p>
-                        </div>
-                    }
-                } else if let Some(err) = (*error).clone() {
-                    let dummy_callback = Callback::from(|_: VEvent| {});
-                    html! {
-                        <div class="calendar-error">
-                            <p>{format!("Error: {}", err)}</p>
-                            <Calendar 
-                                events={HashMap::new()} 
-                                on_event_click={dummy_callback} 
-                                refreshing_event_uid={(*refreshing_event).clone()} 
-                                user_info={props.user_info.clone()}
-                                on_event_context_menu={props.on_event_context_menu.clone()}
-                                on_calendar_context_menu={props.on_calendar_context_menu.clone()}
-                                view={props.view.clone()}
-                                on_create_event_request={props.on_create_event_request.clone()}
-                                on_event_update_request={props.on_event_update_request.clone()}
-                                context_menus_open={props.context_menus_open}
-                            />
-                        </div>
-                    }
-                } else {
-                    html! {
-                        <Calendar 
-                            events={(*events).clone()} 
-                            on_event_click={on_event_click} 
-                            refreshing_event_uid={(*refreshing_event).clone()} 
-                            user_info={props.user_info.clone()}
-                            on_event_context_menu={props.on_event_context_menu.clone()}
-                            on_calendar_context_menu={props.on_calendar_context_menu.clone()}
-                            view={props.view.clone()}
-                            on_create_event_request={props.on_create_event_request.clone()}
-                            on_event_update_request={props.on_event_update_request.clone()}
-                            context_menus_open={props.context_menus_open}
-                        />
-                    }
-                }
-            }
+            <Calendar
+                user_info={props.user_info.clone()}
+                on_event_context_menu={props.on_event_context_menu.clone()}
+                on_calendar_context_menu={props.on_calendar_context_menu.clone()}
+                view={props.view.clone()}
+                on_create_event_request={props.on_create_event_request.clone()}
+                on_event_update_request={props.on_event_update_request.clone()}
+                context_menus_open={props.context_menus_open}
+            />
         </div>
     }
-}
+}

frontend/src/components/sidebar.rs

@@ -1,8 +1,8 @@
+use crate::components::CalendarListItem;
+use crate::services::calendar_service::UserInfo;
+use web_sys::HtmlSelectElement;
 use yew::prelude::*;
 use yew_router::prelude::*;
-use web_sys::HtmlSelectElement;
-use crate::services::calendar_service::UserInfo;
-use crate::components::CalendarListItem;
 
 #[derive(Clone, Routable, PartialEq)]
 pub enum Route {
@@ -33,12 +33,11 @@ pub enum Theme {
 }
 
 impl Theme {
-    
     pub fn value(&self) -> &'static str {
         match self {
             Theme::Default => "default",
             Theme::Ocean => "ocean",
-            Theme::Forest => "forest", 
+            Theme::Forest => "forest",
             Theme::Sunset => "sunset",
             Theme::Purple => "purple",
             Theme::Dark => "dark",
@@ -46,7 +45,7 @@ impl Theme {
             Theme::Mint => "mint",
         }
     }
-    
+
     pub fn from_value(value: &str) -> Self {
         match value {
             "ocean" => Theme::Ocean,
@@ -167,14 +166,14 @@ pub fn sidebar(props: &SidebarProps) -> Html {
                 <button onclick={props.on_create_calendar.reform(|_| ())} class="create-calendar-button">
                     {"+ Create Calendar"}
                 </button>
-                
+
                 <div class="view-selector">
                     <select class="view-selector-dropdown" onchange={on_view_change}>
                         <option value="month" selected={matches!(props.current_view, ViewMode::Month)}>{"Month"}</option>
                         <option value="week" selected={matches!(props.current_view, ViewMode::Week)}>{"Week"}</option>
                     </select>
                 </div>
-                
+
                 <div class="theme-selector">
                     <select class="theme-selector-dropdown" onchange={on_theme_change}>
                         <option value="default" selected={matches!(props.current_theme, Theme::Default)}>{"Default"}</option>
@@ -187,9 +186,9 @@ pub fn sidebar(props: &SidebarProps) -> Html {
                         <option value="mint" selected={matches!(props.current_theme, Theme::Mint)}>{"Mint"}</option>
                     </select>
                 </div>
-                
+
                 <button onclick={props.on_logout.reform(|_| ())} class="logout-button">{"Logout"}</button>
             </div>
         </aside>
     }
-}
+}

frontend/src/components/week_view.rs

@@ -1,10 +1,10 @@
-use yew::prelude::*;
-use chrono::{Datelike, NaiveDate, Duration, Weekday, Local, Timelike, NaiveDateTime, NaiveTime};
+use crate::components::{EventCreationData, RecurringEditAction, RecurringEditModal};
+use crate::models::ical::VEvent;
+use crate::services::calendar_service::UserInfo;
+use chrono::{Datelike, Duration, Local, NaiveDate, NaiveDateTime, NaiveTime, Timelike, Weekday};
 use std::collections::HashMap;
 use web_sys::MouseEvent;
-use crate::services::calendar_service::UserInfo;
-use crate::models::ical::VEvent;
-use crate::components::{RecurringEditModal, RecurringEditAction, EventCreationData};
+use yew::prelude::*;
 
 #[derive(Properties, PartialEq)]
 pub struct WeekViewProps {
@@ -25,7 +25,17 @@ pub struct WeekViewProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<EventCreationData>>,
     #[prop_or_default]
-    pub on_event_update: Option<Callback<(VEvent, NaiveDateTime, NaiveDateTime, bool, Option<chrono::DateTime<chrono::Utc>>, Option<String>, Option<String>)>>,
+    pub on_event_update: Option<
+        Callback<(
+            VEvent,
+            NaiveDateTime,
+            NaiveDateTime,
+            bool,
+            Option<chrono::DateTime<chrono::Utc>>,
+            Option<String>,
+            Option<String>,
+        )>,
+    >,
     #[prop_or_default]
     pub context_menus_open: bool,
     #[prop_or_default]
@@ -47,20 +57,18 @@ struct DragState {
     start_date: NaiveDate,
     start_y: f64,
     current_y: f64,
-    offset_y: f64, // For event moves, this is the offset from the event's top
+    offset_y: f64,   // For event moves, this is the offset from the event's top
     has_moved: bool, // Track if we've moved enough to constitute a real drag
 }
 
 #[function_component(WeekView)]
 pub fn week_view(props: &WeekViewProps) -> Html {
     let start_of_week = get_start_of_week(props.current_date);
-    let week_days: Vec<NaiveDate> = (0..7)
-        .map(|i| start_of_week + Duration::days(i))
-        .collect();
+    let week_days: Vec<NaiveDate> = (0..7).map(|i| start_of_week + Duration::days(i)).collect();
 
     // Drag state for event creation
     let drag_state = use_state(|| None::<DragState>);
-    
+
     // State for recurring event edit modal
     #[derive(Clone, PartialEq)]
     struct PendingRecurringEdit {
@@ -68,15 +76,18 @@ pub fn week_view(props: &WeekViewProps) -> Html {
         new_start: NaiveDateTime,
         new_end: NaiveDateTime,
     }
-    
+
     let pending_recurring_edit = use_state(|| None::<PendingRecurringEdit>);
 
     // Helper function to get calendar color for an event
     let get_event_color = |event: &VEvent| -> String {
         if let Some(user_info) = &props.user_info {
             if let Some(calendar_path) = &event.calendar_path {
-                if let Some(calendar) = user_info.calendars.iter()
-                    .find(|cal| &cal.path == calendar_path) {
+                if let Some(calendar) = user_info
+                    .calendars
+                    .iter()
+                    .find(|cal| &cal.path == calendar_path)
+                {
                     return calendar.color.clone();
                 }
             }
@@ -85,21 +96,22 @@ pub fn week_view(props: &WeekViewProps) -> Html {
     };
 
     // Generate time labels - 24 hours plus the final midnight boundary
-    let mut time_labels: Vec<String> = (0..24).map(|hour| {
-        if hour == 0 {
-            "12 AM".to_string()
-        } else if hour < 12 {
-            format!("{} AM", hour)
-        } else if hour == 12 {
-            "12 PM".to_string()
-        } else {
-            format!("{} PM", hour - 12)
-        }
-    }).collect();
-    
+    let mut time_labels: Vec<String> = (0..24)
+        .map(|hour| {
+            if hour == 0 {
+                "12 AM".to_string()
+            } else if hour < 12 {
+                format!("{} AM", hour)
+            } else if hour == 12 {
+                "12 PM".to_string()
+            } else {
+                format!("{} PM", hour - 12)
+            }
+        })
+        .collect();
+
     // Add the final midnight boundary to show where the day ends
     time_labels.push("12 AM".to_string());
-    
 
     // Handlers for recurring event modification modal
     let on_recurring_choice = {
@@ -135,35 +147,35 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                         if let Some(update_callback) = &on_event_update {
                             // Extract occurrence date for backend processing
                             let occurrence_date = edit.event.dtstart.format("%Y-%m-%d").to_string();
-                            
+
                             // Send single request to backend with "this_only" scope
                             // Backend will atomically:
                             // 1. Add EXDATE to original series (excludes this occurrence)
                             // 2. Create exception event with RECURRENCE-ID and user's modifications
                             update_callback.emit((
-                                edit.event.clone(),     // Original event (series to modify)
-                                edit.new_start,         // Dragged start time for exception
-                                edit.new_end,           // Dragged end time for exception
-                                true,                   // preserve_rrule = true
-                                None,                   // No until_date for this_only
+                                edit.event.clone(),            // Original event (series to modify)
+                                edit.new_start,                // Dragged start time for exception
+                                edit.new_end,                  // Dragged end time for exception
+                                true,                          // preserve_rrule = true
+                                None,                          // No until_date for this_only
                                 Some("this_only".to_string()), // Update scope
-                                Some(occurrence_date)   // Date of occurrence being modified
+                                Some(occurrence_date),         // Date of occurrence being modified
                             ));
                         }
-                    },
+                    }
                     RecurringEditAction::FutureEvents => {
                         // RFC 5545 Compliant Series Splitting: "This and Future Events"
-                        // 
+                        //
                         // When a user chooses to modify "this and future events" for a recurring series,
                         // we implement a series split operation that:
-                        // 
-                        // 1. **Terminates Original Series**: The existing series is updated with an UNTIL 
+                        //
+                        // 1. **Terminates Original Series**: The existing series is updated with an UNTIL
                         //    clause to stop before the occurrence being modified
-                        // 2. **Creates New Series**: A new recurring series is created starting from the 
+                        // 2. **Creates New Series**: A new recurring series is created starting from the
                         //    occurrence date with the user's modifications (new time, title, etc.)
                         //
                         // Example: User drags Aug 22 occurrence of "Daily 9AM meeting" to 2PM:
-                        // - Original: "Daily 9AM meeting" → ends Aug 21 (UNTIL=Aug22T000000Z) 
+                        // - Original: "Daily 9AM meeting" → ends Aug 21 (UNTIL=Aug22T000000Z)
                         // - New: "Daily 2PM meeting" → starts Aug 22, continues indefinitely
                         //
                         // This approach ensures:
@@ -177,7 +189,8 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                         if let Some(update_callback) = &on_event_update {
                             // Find the original series event (not the occurrence)
                             // UIDs like "uuid-timestamp" need to split on the last hyphen, not the first
-                            let base_uid = if let Some(last_hyphen_pos) = edit.event.uid.rfind('-') {
+                            let base_uid = if let Some(last_hyphen_pos) = edit.event.uid.rfind('-')
+                            {
                                 let suffix = &edit.event.uid[last_hyphen_pos + 1..];
                                 // Check if suffix is numeric (timestamp), if so remove it
                                 if suffix.chars().all(|c| c.is_numeric()) {
@@ -188,9 +201,15 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                             } else {
                                 edit.event.uid.clone()
                             };
-                            
-                            web_sys::console::log_1(&format!("🔍 Looking for original series: '{}' from occurrence: '{}'", base_uid, edit.event.uid).into());
-                            
+
+                            web_sys::console::log_1(
+                                &format!(
+                                    "🔍 Looking for original series: '{}' from occurrence: '{}'",
+                                    base_uid, edit.event.uid
+                                )
+                                .into(),
+                            );
+
                             // Find the original series event by searching for the base UID
                             let mut original_series = None;
                             for events_list in events.values() {
@@ -204,12 +223,15 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                     break;
                                 }
                             }
-                            
+
                             let original_series = match original_series {
                                 Some(series) => {
-                                    web_sys::console::log_1(&format!("✅ Found original series: '{}'", series.uid).into());
+                                    web_sys::console::log_1(
+                                        &format!("✅ Found original series: '{}'", series.uid)
+                                            .into(),
+                                    );
                                     series
-                                },
+                                }
                                 None => {
                                     web_sys::console::log_1(&format!("⚠️  Could not find original series '{}', using occurrence but fixing UID", base_uid).into());
                                     let mut fallback_event = edit.event.clone();
@@ -218,55 +240,69 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                     fallback_event
                                 }
                             };
-                            
+
                             // Calculate the day before this occurrence for UNTIL clause
-                            let until_date = edit.event.dtstart.date_naive() - chrono::Duration::days(1);
-                            let until_datetime = until_date.and_time(chrono::NaiveTime::from_hms_opt(23, 59, 59).unwrap());
-                            let until_utc = chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(until_datetime, chrono::Utc);
-                            
+                            let until_date =
+                                edit.event.dtstart.date_naive() - chrono::Duration::days(1);
+                            let until_datetime = until_date
+                                .and_time(chrono::NaiveTime::from_hms_opt(23, 59, 59).unwrap());
+                            let until_utc =
+                                chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(
+                                    until_datetime,
+                                    chrono::Utc,
+                                );
+
                             web_sys::console::log_1(&format!("🔄 Will set UNTIL {} for original series to end before occurrence {}", 
                                 until_utc.format("%Y-%m-%d %H:%M:%S UTC"),
                                 edit.event.dtstart.format("%Y-%m-%d %H:%M:%S UTC")).into());
-                            
+
                             // Critical: Use the dragged times (new_start/new_end) not the original series times
                             // This ensures the new series reflects the user's drag operation
-                            let new_start = edit.new_start; // The dragged start time  
+                            let new_start = edit.new_start; // The dragged start time
                             let new_end = edit.new_end; // The dragged end time
-                            
+
                             // Extract occurrence date from the dragged event for backend processing
                             // Format: YYYY-MM-DD (e.g., "2025-08-22")
                             // This tells the backend which specific occurrence is being modified
                             let occurrence_date = edit.event.dtstart.format("%Y-%m-%d").to_string();
-                            
+
                             // Send single request to backend with "this_and_future" scope
                             // Backend will atomically:
                             // 1. Add UNTIL clause to original series (stops before occurrence_date)
                             // 2. Create new series starting from occurrence_date with dragged times
                             update_callback.emit((
-                                original_series,    // Original event to terminate
-                                new_start,          // Dragged start time for new series
-                                new_end,            // Dragged end time for new series  
-                                true,               // preserve_rrule = true
-                                Some(until_utc),    // UNTIL date for original series
+                                original_series,                     // Original event to terminate
+                                new_start,       // Dragged start time for new series
+                                new_end,         // Dragged end time for new series
+                                true,            // preserve_rrule = true
+                                Some(until_utc), // UNTIL date for original series
                                 Some("this_and_future".to_string()), // Update scope
-                                Some(occurrence_date) // Date of occurrence being modified
+                                Some(occurrence_date), // Date of occurrence being modified
                             ));
                         }
-                    },
+                    }
                     RecurringEditAction::AllEvents => {
                         // Modify the entire series
                         let series_event = edit.event.clone();
-                        
+
                         if let Some(callback) = &on_event_update {
-                            callback.emit((series_event, edit.new_start, edit.new_end, true, None, Some("all_in_series".to_string()), None)); // Regular drag operation - preserve RRULE, update_scope = all_in_series
+                            callback.emit((
+                                series_event,
+                                edit.new_start,
+                                edit.new_end,
+                                true,
+                                None,
+                                Some("all_in_series".to_string()),
+                                None,
+                            )); // Regular drag operation - preserve RRULE, update_scope = all_in_series
                         }
-                    },
+                    }
                 }
             }
             pending_recurring_edit.set(None);
         })
     };
-    
+
     let on_recurring_cancel = {
         let pending_recurring_edit = pending_recurring_edit.clone();
         Callback::from(move |_| {
@@ -283,7 +319,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                     week_days.iter().map(|date| {
                         let is_today = *date == props.today;
                         let weekday_name = get_weekday_name(date.weekday());
-                        
+
                         html! {
                             <div class={classes!("week-day-header", if is_today { Some("today") } else { None })}>
                                 <div class="weekday-name">{weekday_name}</div>
@@ -293,7 +329,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                     }).collect::<Html>()
                 }
             </div>
-            
+
             // Scrollable content area with time grid
             <div class="week-content">
                 <div class="time-grid">
@@ -310,18 +346,18 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                             }).collect::<Html>()
                         }
                     </div>
-                    
+
                     // Day columns
                     <div class="week-days-grid">
                         {
                             week_days.iter().enumerate().map(|(_column_index, date)| {
                                 let is_today = *date == props.today;
                                 let day_events = props.events.get(date).cloned().unwrap_or_default();
-                                
+
                                 // Drag event handlers
                                 let drag_state_clone = drag_state.clone();
                                 let date_for_drag = *date;
-                                
+
                                 let onmousedown = {
                                     let drag_state = drag_state_clone.clone();
                                     let context_menus_open = props.context_menus_open;
@@ -331,20 +367,20 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                         if context_menus_open {
                                             return;
                                         }
-                                        
+
                                         // Only handle left-click (button 0)
                                         if e.button() != 0 {
                                             return;
                                         }
-                                        
+
                                         // Calculate Y position relative to day column container
                                         // Use layer_y which gives coordinates relative to positioned ancestor
                                         let relative_y = e.layer_y() as f64;
                                         let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
-                                        
+
                                         // Snap to increment
                                         let snapped_y = snap_to_increment(relative_y, time_increment);
-                                        
+
                                         drag_state.set(Some(DragState {
                                             is_dragging: true,
                                             drag_type: DragType::CreateEvent,
@@ -357,7 +393,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                         e.prevent_default();
                                     })
                                 };
-                                
+
                                 let onmousemove = {
                                     let drag_state = drag_state_clone.clone();
                                     let time_increment = props.time_increment;
@@ -367,27 +403,27 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                 // Use layer_y for consistent coordinate calculation
                                                 let mouse_y = e.layer_y() as f64;
                                                 let mouse_y = if mouse_y > 0.0 { mouse_y } else { e.offset_y() as f64 };
-                                                
+
                                                 // For move operations, we now follow the mouse directly since we start at click position
                                                 // For resize operations, we still use the mouse position directly
                                                 let adjusted_y = mouse_y;
-                                                
+
                                                 // Snap to increment
                                                 let snapped_y = snap_to_increment(adjusted_y, time_increment);
-                                                
+
                                                 // Check if we've moved enough to constitute a real drag (5 pixels minimum)
                                                 let movement_distance = (snapped_y - current_drag.start_y).abs();
                                                 if movement_distance > 5.0 {
                                                     current_drag.has_moved = true;
                                                 }
-                                                
+
                                                 current_drag.current_y = snapped_y;
                                                 drag_state.set(Some(current_drag));
                                             }
                                         }
                                     })
                                 };
-                                
+
                                 let onmouseup = {
                                     let drag_state = drag_state_clone.clone();
                                     let on_create_event = props.on_create_event.clone();
@@ -402,24 +438,24 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         // Calculate start and end times
                                                         let start_time = pixels_to_time(current_drag.start_y);
                                                         let end_time = pixels_to_time(current_drag.current_y);
-                                                        
+
                                                         // Ensure start is before end
                                                         let (actual_start, actual_end) = if start_time <= end_time {
                                                             (start_time, end_time)
                                                         } else {
                                                             (end_time, start_time)
                                                         };
-                                                        
+
                                                         // Ensure minimum duration (15 minutes)
                                                         let actual_end = if actual_end.signed_duration_since(actual_start).num_minutes() < 15 {
                                                             actual_start + chrono::Duration::minutes(15)
                                                         } else {
                                                             actual_end
                                                         };
-                                                        
+
                                                         let start_datetime = NaiveDateTime::new(current_drag.start_date, actual_start);
                                                         let end_datetime = NaiveDateTime::new(current_drag.start_date, actual_end);
-                                                        
+
                                                         if let Some(callback) = &on_create_event {
                                                             callback.emit((current_drag.start_date, start_datetime, end_datetime));
                                                         }
@@ -430,17 +466,17 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         // Snap the final position to maintain time increment alignment
                                                         let event_top_position = snap_to_increment(unsnapped_position, time_increment);
                                                         let new_start_time = pixels_to_time(event_top_position);
-                                                        
+
                                                         // Calculate duration from original event
                                                         let original_duration = if let Some(end) = event.dtend {
                                                             end.signed_duration_since(event.dtstart)
                                                         } else {
                                                             chrono::Duration::hours(1) // Default 1 hour
                                                         };
-                                                        
+
                                                         let new_start_datetime = NaiveDateTime::new(current_drag.start_date, new_start_time);
                                                         let new_end_datetime = new_start_datetime + original_duration;
-                                                        
+
                                                         // Check if this is a recurring event
                                                         if event.rrule.is_some() {
                                                             // Show modal for recurring event modification
@@ -459,7 +495,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                     DragType::ResizeEventStart(event) => {
                                                         // Calculate new start time based on drag position
                                                         let new_start_time = pixels_to_time(current_drag.current_y);
-                                                        
+
                                                         // Keep the original end time
                                                         let original_end = if let Some(end) = event.dtend {
                                                             end.with_timezone(&chrono::Local).naive_local()
@@ -467,16 +503,16 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             // If no end time, use start time + 1 hour as default
                                                             event.dtstart.with_timezone(&chrono::Local).naive_local() + chrono::Duration::hours(1)
                                                         };
-                                                        
+
                                                         let new_start_datetime = NaiveDateTime::new(current_drag.start_date, new_start_time);
-                                                        
+
                                                         // Ensure start is before end (minimum 15 minutes)
                                                         let new_end_datetime = if new_start_datetime >= original_end {
                                                             new_start_datetime + chrono::Duration::minutes(15)
                                                         } else {
                                                             original_end
                                                         };
-                                                        
+
                                                         // Check if this is a recurring event
                                                         if event.rrule.is_some() {
                                                             // Show modal for recurring event modification
@@ -495,19 +531,19 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                     DragType::ResizeEventEnd(event) => {
                                                         // Calculate new end time based on drag position
                                                         let new_end_time = pixels_to_time(current_drag.current_y);
-                                                        
+
                                                         // Keep the original start time
                                                         let original_start = event.dtstart.with_timezone(&chrono::Local).naive_local();
-                                                        
+
                                                         let new_end_datetime = NaiveDateTime::new(current_drag.start_date, new_end_time);
-                                                        
+
                                                         // Ensure end is after start (minimum 15 minutes)
                                                         let new_start_datetime = if new_end_datetime <= original_start {
                                                             new_end_datetime - chrono::Duration::minutes(15)
                                                         } else {
                                                             original_start
                                                         };
-                                                        
+
                                                         // Check if this is a recurring event
                                                         if event.rrule.is_some() {
                                                             // Show modal for recurring event modification
@@ -524,15 +560,15 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         }
                                                     }
                                                 }
-                                                
+
                                                 drag_state.set(None);
                                             }
                                         }
                                     })
                                 };
-                                
+
                                 html! {
-                                    <div 
+                                    <div
                                         class={classes!("week-day-column", if is_today { Some("today") } else { None })}
                                         {onmousedown}
                                         {onmousemove}
@@ -554,21 +590,21 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                             <div class="time-slot-half"></div>
                                             <div class="time-slot-half"></div>
                                         </div>
-                                        
+
                                         // Events positioned absolutely based on their actual times
                                         <div class="events-container">
                                             {
                                                 day_events.iter().filter_map(|event| {
                                                     let (start_pixels, duration_pixels, is_all_day) = calculate_event_position(event, *date);
-                                                    
+
                                                     // Skip events that don't belong on this date or have invalid positioning
                                                     if start_pixels == 0.0 && duration_pixels == 0.0 && !is_all_day {
                                                         return None;
                                                     }
-                                                    
+
                                                     let event_color = get_event_color(event);
                                                     let is_refreshing = props.refreshing_event_uid.as_ref() == Some(&event.uid);
-                                                    
+
                                                     let onclick = {
                                                         let on_event_click = props.on_event_click.clone();
                                                         let event = event.clone();
@@ -577,7 +613,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             on_event_click.emit(event.clone());
                                                         })
                                                     };
-                                                    
+
                                                     let onmousedown_event = {
                                                         let drag_state = drag_state.clone();
                                                         let event_for_drag = event.clone();
@@ -585,27 +621,27 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         let _time_increment = props.time_increment;
                                                         Callback::from(move |e: MouseEvent| {
                                                             e.stop_propagation(); // Prevent drag-to-create from starting on event clicks
-                                                            
+
                                                             // Only handle left-click (button 0) for moving
                                                             if e.button() != 0 {
                                                                 return;
                                                             }
-                                                            
+
                                                             // Calculate click position relative to event element
                                                             let click_y_relative = e.layer_y() as f64;
                                                             let click_y_relative = if click_y_relative > 0.0 { click_y_relative } else { e.offset_y() as f64 };
-                                                            
+
                                                             // Get event's current position in day column coordinates
                                                             let (event_start_pixels, _, _) = calculate_event_position(&event_for_drag, date_for_drag);
                                                             let event_start_pixels = event_start_pixels as f64;
-                                                            
+
                                                             // Convert click position to day column coordinates
                                                             let click_y = event_start_pixels + click_y_relative;
-                                                            
+
                                                             // Store the offset from the event's top where the user clicked
                                                             // This will be used to maintain the relative click position
                                                             let offset_y = click_y_relative;
-                                                            
+
                                                             // Start drag tracking from where we clicked (in day column coordinates)
                                                             drag_state.set(Some(DragState {
                                                                 is_dragging: true,
@@ -619,7 +655,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             e.prevent_default();
                                                         })
                                                     };
-                                                    
+
                                                     let oncontextmenu = {
                                                         if let Some(callback) = &props.on_event_context_menu {
                                                             let callback = callback.clone();
@@ -633,7 +669,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                         return;
                                                                     }
                                                                 }
-                                                                
+
                                                                 e.prevent_default();
                                                                 e.stop_propagation(); // Prevent calendar context menu from also triggering
                                                                 callback.emit((e, event.clone()));
@@ -642,7 +678,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             None
                                                         }
                                                     };
-                                                    
+
                                                     // Format time display for the event
                                                     let time_display = if event.all_day {
                                                         "All Day".to_string()
@@ -650,20 +686,20 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         let local_start = event.dtstart.with_timezone(&Local);
                                                         if let Some(end) = event.dtend {
                                                             let local_end = end.with_timezone(&Local);
-                                                            
+
                                                             // Check if both times are in same AM/PM period to avoid redundancy
                                                             let start_is_am = local_start.hour() < 12;
                                                             let end_is_am = local_end.hour() < 12;
-                                                            
+
                                                             if start_is_am == end_is_am {
                                                                 // Same AM/PM period - show "9:00 - 10:30 AM"
-                                                                format!("{} - {}", 
+                                                                format!("{} - {}",
                                                                     local_start.format("%I:%M").to_string().trim_start_matches('0'),
                                                                     local_end.format("%I:%M %p")
                                                                 )
                                                             } else {
                                                                 // Different AM/PM periods - show "9:00 AM - 2:30 PM"
-                                                                format!("{} - {}", 
+                                                                format!("{} - {}",
                                                                     local_start.format("%I:%M %p"),
                                                                     local_end.format("%I:%M %p")
                                                                 )
@@ -673,22 +709,22 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             format!("{}", local_start.format("%I:%M %p"))
                                                         }
                                                     };
-                                                    
+
                                                     // Check if this event is currently being dragged or resized
                                                     let is_being_dragged = if let Some(drag) = (*drag_state).clone() {
                                                         match &drag.drag_type {
-                                                            DragType::MoveEvent(dragged_event) => 
+                                                            DragType::MoveEvent(dragged_event) =>
                                                                 dragged_event.uid == event.uid && drag.is_dragging,
-                                                            DragType::ResizeEventStart(dragged_event) => 
+                                                            DragType::ResizeEventStart(dragged_event) =>
                                                                 dragged_event.uid == event.uid && drag.is_dragging,
-                                                            DragType::ResizeEventEnd(dragged_event) => 
+                                                            DragType::ResizeEventEnd(dragged_event) =>
                                                                 dragged_event.uid == event.uid && drag.is_dragging,
                                                             _ => false,
                                                         }
                                                     } else {
                                                         false
                                                     };
-                                                    
+
                                                     if is_being_dragged {
                                                         // Hide the original event while being dragged
                                                         Some(html! {})
@@ -701,11 +737,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             let time_increment = props.time_increment;
                                                             Callback::from(move |e: web_sys::MouseEvent| {
                                                                 e.stop_propagation();
-                                                                
+
                                                                 let relative_y = e.layer_y() as f64;
                                                                 let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
                                                                 let snapped_y = snap_to_increment(relative_y, time_increment);
-                                                                
+
                                                                 drag_state.set(Some(DragState {
                                                                     is_dragging: true,
                                                                     drag_type: DragType::ResizeEventStart(event_for_resize.clone()),
@@ -718,7 +754,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                 e.prevent_default();
                                                             })
                                                         };
-                                                        
+
                                                         let resize_end_handler = {
                                                             let drag_state = drag_state.clone();
                                                             let event_for_resize = event.clone();
@@ -726,11 +762,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             let time_increment = props.time_increment;
                                                             Callback::from(move |e: web_sys::MouseEvent| {
                                                                 e.stop_propagation();
-                                                                
+
                                                                 let relative_y = e.layer_y() as f64;
                                                                 let relative_y = if relative_y > 0.0 { relative_y } else { e.offset_y() as f64 };
                                                                 let snapped_y = snap_to_increment(relative_y, time_increment);
-                                                                
+
                                                                 drag_state.set(Some(DragState {
                                                                     is_dragging: true,
                                                                     drag_type: DragType::ResizeEventEnd(event_for_resize.clone()),
@@ -743,18 +779,18 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                 e.prevent_default();
                                                             })
                                                         };
-                                                        
+
                                                         Some(html! {
-                                                            <div 
+                                                            <div
                                                                 class={classes!(
-                                                                    "week-event", 
+                                                                    "week-event",
                                                                     if is_refreshing { Some("refreshing") } else { None },
                                                                     if is_all_day { Some("all-day") } else { None }
                                                                 )}
                                                                 style={format!(
-                                                                    "background-color: {}; top: {}px; height: {}px;", 
-                                                                    event_color, 
-                                                                    start_pixels, 
+                                                                    "background-color: {}; top: {}px; height: {}px;",
+                                                                    event_color,
+                                                                    start_pixels,
                                                                     duration_pixels
                                                                 )}
                                                                 {onclick}
@@ -764,7 +800,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                 // Top resize handle
                                                                 {if !is_all_day {
                                                                     html! {
-                                                                        <div 
+                                                                        <div
                                                                             class="resize-handle resize-handle-top"
                                                                             onmousedown={resize_start_handler}
                                                                         />
@@ -772,7 +808,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                 } else {
                                                                     html! {}
                                                                 }}
-                                                                
+
                                                                 // Event content
                                                                 <div class="event-content">
                                                                     <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
@@ -782,11 +818,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                                         html! {}
                                                                     }}
                                                                 </div>
-                                                                
+
                                                                 // Bottom resize handle
                                                                 {if !is_all_day {
                                                                     html! {
-                                                                        <div 
+                                                                        <div
                                                                             class="resize-handle resize-handle-bottom"
                                                                             onmousedown={resize_end_handler}
                                                                         />
@@ -800,7 +836,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                 }).collect::<Html>()
                                             }
                                         </div>
-                                        
+
                                         // Temporary event box during drag
                                         {
                                             if let Some(drag) = (*drag_state).clone() {
@@ -810,11 +846,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             let start_y = drag.start_y.min(drag.current_y);
                                                             let end_y = drag.start_y.max(drag.current_y);
                                                             let height = (drag.current_y - drag.start_y).abs().max(20.0);
-                                                            
+
                                                             // Convert pixels to times for display
                                                             let start_time = pixels_to_time(start_y);
                                                             let end_time = pixels_to_time(end_y);
-                                                            
+
                                                             html! {
                                                                 <div
                                                                     class="temp-event-box"
@@ -837,9 +873,9 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             };
                                                             let duration_pixels = (original_duration.num_minutes() as f64).max(20.0);
                                                             let new_end_time = new_start_time + original_duration;
-                                                            
+
                                                             let event_color = get_event_color(event);
-                                                            
+
                                                             html! {
                                                                 <div
                                                                     class="temp-event-box moving-event"
@@ -858,17 +894,17 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             } else {
                                                                 event.dtstart.with_timezone(&chrono::Local).naive_local() + chrono::Duration::hours(1)
                                                             };
-                                                            
+
                                                             // Calculate positions for the preview
                                                             let (original_start_pixels, _, _) = calculate_event_position(event, drag.start_date);
                                                             let original_duration = original_end.signed_duration_since(event.dtstart.with_timezone(&chrono::Local).naive_local());
                                                             let original_end_pixels = original_start_pixels + (original_duration.num_minutes() as f32);
-                                                            
+
                                                             let new_start_pixels = drag.current_y;
                                                             let new_height = (original_end_pixels as f64 - new_start_pixels).max(20.0);
-                                                            
+
                                                             let event_color = get_event_color(event);
-                                                            
+
                                                             html! {
                                                                 <div
                                                                     class="temp-event-box resizing-event"
@@ -883,15 +919,15 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             // Show the event being resized from the end
                                                             let new_end_time = pixels_to_time(drag.current_y);
                                                             let original_start = event.dtstart.with_timezone(&chrono::Local).naive_local();
-                                                            
+
                                                             // Calculate positions for the preview
                                                             let (original_start_pixels, _, _) = calculate_event_position(event, drag.start_date);
-                                                            
+
                                                             let new_end_pixels = drag.current_y;
                                                             let new_height = (new_end_pixels - original_start_pixels as f64).max(20.0);
-                                                            
+
                                                             let event_color = get_event_color(event);
-                                                            
+
                                                             html! {
                                                                 <div
                                                                     class="temp-event-box resizing-event"
@@ -917,10 +953,10 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                     </div>
                 </div>
             </div>
-            
+
             // Recurring event modification modal
             if let Some(edit) = (*pending_recurring_edit).clone() {
-                <RecurringEditModal 
+                <RecurringEditModal
                     show={true}
                     event={edit.event}
                     new_start={edit.new_start}
@@ -975,46 +1011,44 @@ fn pixels_to_time(pixels: f64) -> NaiveTime {
     let total_minutes = pixels; // 1px = 1 minute
     let hours = (total_minutes / 60.0) as u32;
     let minutes = (total_minutes % 60.0) as u32;
-    
+
     // Handle midnight boundary - if we're at exactly 1440 pixels (24:00), return midnight
     if total_minutes >= 1440.0 {
         return NaiveTime::from_hms_opt(0, 0, 0).unwrap();
     }
-    
+
     // Clamp to valid time range for within-day times
     let hours = hours.min(23);
     let minutes = minutes.min(59);
-    
+
     NaiveTime::from_hms_opt(hours, minutes, 0).unwrap_or(NaiveTime::from_hms_opt(0, 0, 0).unwrap())
 }
 
-
 fn calculate_event_position(event: &VEvent, date: NaiveDate) -> (f32, f32, bool) {
     // Convert UTC times to local time for display
     let local_start = event.dtstart.with_timezone(&Local);
     let event_date = local_start.date_naive();
-    
+
     // Only position events that are on this specific date
     if event_date != date {
         return (0.0, 0.0, false); // Event not on this date
     }
-    
+
     // Handle all-day events - they appear at the top
     if event.all_day {
         return (0.0, 30.0, true); // Position at top, 30px height, is_all_day = true
     }
-    
+
     // Calculate start position in pixels from midnight
     let start_hour = local_start.hour() as f32;
     let start_minute = local_start.minute() as f32;
     let start_pixels = (start_hour + start_minute / 60.0) * 60.0; // 60px per hour
-    
-    
+
     // Calculate duration and height
     let duration_pixels = if let Some(end) = event.dtend {
         let local_end = end.with_timezone(&Local);
         let end_date = local_end.date_naive();
-        
+
         // Handle events that span multiple days by capping at midnight
         if end_date > date {
             // Event continues past midnight, cap at 24:00 (1440px)
@@ -1028,6 +1062,6 @@ fn calculate_event_position(event: &VEvent, date: NaiveDate) -> (f32, f32, bool)
     } else {
         60.0 // Default 1 hour if no end time
     };
-    
+
     (start_pixels, duration_pixels, false) // is_all_day = false
-}
+}

frontend/src/config.rs

@@ -1,284 +0,0 @@
-use serde::{Deserialize, Serialize};
-use std::env;
-use base64::prelude::*;
-
-/// Configuration for CalDAV server connection and authentication.
-/// 
-/// This struct holds all the necessary information to connect to a CalDAV server,
-/// including server URL, credentials, and optional collection paths.
-/// 
-/// # Security Note
-/// 
-/// The password field contains sensitive information and should be handled carefully.
-/// This struct implements `Debug` but in production, consider implementing a custom
-/// `Debug` that masks the password field.
-/// 
-/// # Example
-/// 
-/// ```rust
-/// use crate::config::CalDAVConfig;
-/// 
-/// // Load configuration from environment variables
-/// let config = CalDAVConfig::from_env()?;
-/// 
-/// // Use the configuration for HTTP requests
-/// let auth_header = format!("Basic {}", config.get_basic_auth());
-/// ```
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CalDAVConfig {
-    /// The base URL of the CalDAV server (e.g., "https://caldav.example.com/dav/")
-    pub server_url: String,
-    
-    /// Username for authentication with the CalDAV server
-    pub username: String,
-    
-    /// Password for authentication with the CalDAV server
-    /// 
-    /// **Security Note**: This contains sensitive information
-    pub password: String,
-    
-    /// Optional path to the calendar collection on the server
-    /// 
-    /// If not provided, the client will need to discover available calendars
-    /// through CalDAV PROPFIND requests
-    pub calendar_path: Option<String>,
-    
-    /// Optional path to the tasks/todo collection on the server
-    /// 
-    /// Some CalDAV servers store tasks separately from calendar events
-    pub tasks_path: Option<String>,
-}
-
-impl CalDAVConfig {
-    /// Creates a new CalDAVConfig by loading values from environment variables.
-    /// 
-    /// This method will attempt to load a `.env` file from the current directory
-    /// and then read the following required environment variables:
-    /// 
-    /// - `CALDAV_SERVER_URL`: The CalDAV server base URL
-    /// - `CALDAV_USERNAME`: Username for authentication
-    /// - `CALDAV_PASSWORD`: Password for authentication
-    /// 
-    /// Optional environment variables:
-    /// 
-    /// - `CALDAV_CALENDAR_PATH`: Path to calendar collection
-    /// - `CALDAV_TASKS_PATH`: Path to tasks collection
-    /// 
-    /// # Errors
-    /// 
-    /// Returns `ConfigError::MissingVar` if any required environment variable
-    /// is not set or cannot be read.
-    /// 
-    /// # Example
-    /// 
-    /// ```rust
-    /// use crate::config::CalDAVConfig;
-    /// 
-    /// match CalDAVConfig::from_env() {
-    ///     Ok(config) => {
-    ///         println!("Loaded config for server: {}", config.server_url);
-    ///     }
-    ///     Err(e) => {
-    ///         eprintln!("Failed to load config: {}", e);
-    ///     }
-    /// }
-    /// ```
-    pub fn from_env() -> Result<Self, ConfigError> {
-        // Attempt to load .env file, but don't fail if it doesn't exist
-        dotenvy::dotenv().ok();
-
-        let server_url = env::var("CALDAV_SERVER_URL")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_SERVER_URL".to_string()))?;
-
-        let username = env::var("CALDAV_USERNAME")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_USERNAME".to_string()))?;
-
-        let password = env::var("CALDAV_PASSWORD")
-            .map_err(|_| ConfigError::MissingVar("CALDAV_PASSWORD".to_string()))?;
-
-        // Optional paths - it's fine if these are not set
-        let calendar_path = env::var("CALDAV_CALENDAR_PATH").ok();
-        let tasks_path = env::var("CALDAV_TASKS_PATH").ok();
-
-        Ok(CalDAVConfig {
-            server_url,
-            username,
-            password,
-            calendar_path,
-            tasks_path,
-        })
-    }
-
-    /// Generates a Base64-encoded string for HTTP Basic Authentication.
-    /// 
-    /// This method combines the username and password in the format
-    /// `username:password` and encodes it using Base64, which is the
-    /// standard format for the `Authorization: Basic` HTTP header.
-    /// 
-    /// # Returns
-    /// 
-    /// A Base64-encoded string that can be used directly in the
-    /// `Authorization` header: `Authorization: Basic <returned_value>`
-    /// 
-    /// # Example
-    /// 
-    /// ```rust
-    /// use crate::config::CalDAVConfig;
-    /// 
-    /// let config = CalDAVConfig {
-    ///     server_url: "https://example.com".to_string(),
-    ///     username: "user".to_string(),
-    ///     password: "pass".to_string(),
-    ///     calendar_path: None,
-    ///     tasks_path: None,
-    /// };
-    /// 
-    /// let auth_value = config.get_basic_auth();
-    /// let auth_header = format!("Basic {}", auth_value);
-    /// ```
-    pub fn get_basic_auth(&self) -> String {
-        let credentials = format!("{}:{}", self.username, self.password);
-        BASE64_STANDARD.encode(&credentials)
-    }
-}
-
-/// Errors that can occur when loading or using CalDAV configuration.
-#[derive(Debug, thiserror::Error)]
-pub enum ConfigError {
-    /// A required environment variable is missing or cannot be read.
-    /// 
-    /// This error occurs when calling `CalDAVConfig::from_env()` and one of the
-    /// required environment variables (`CALDAV_SERVER_URL`, `CALDAV_USERNAME`,
-    /// or `CALDAV_PASSWORD`) is not set.
-    #[error("Missing environment variable: {0}")]
-    MissingVar(String),
-    
-    /// The configuration contains invalid or malformed values.
-    /// 
-    /// This could include malformed URLs, invalid authentication credentials,
-    /// or other configuration issues that prevent proper CalDAV operation.
-    #[error("Invalid configuration: {0}")]
-    Invalid(String),
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_basic_auth_encoding() {
-        let config = CalDAVConfig {
-            server_url: "https://example.com".to_string(),
-            username: "testuser".to_string(),
-            password: "testpass".to_string(),
-            calendar_path: None,
-            tasks_path: None,
-        };
-
-        let auth = config.get_basic_auth();
-        let expected = BASE64_STANDARD.encode("testuser:testpass");
-        assert_eq!(auth, expected);
-    }
-
-    /// Integration test that authenticates with the actual Baikal CalDAV server
-    /// 
-    /// This test requires a valid .env file with:
-    /// - CALDAV_SERVER_URL
-    /// - CALDAV_USERNAME  
-    /// - CALDAV_PASSWORD
-    /// 
-    /// Run with: `cargo test test_baikal_auth`
-    #[tokio::test]
-    async fn test_baikal_auth() {
-        // Load config from .env
-        let config = CalDAVConfig::from_env()
-            .expect("Failed to load CalDAV config from environment");
-
-        println!("Testing authentication to: {}", config.server_url);
-
-        // Create HTTP client
-        let client = reqwest::Client::new();
-
-        // Make a simple OPTIONS request to test authentication
-        let response = client
-            .request(reqwest::Method::OPTIONS, &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
-            .header("User-Agent", "calendar-app/0.1.0")
-            .send()
-            .await
-            .expect("Failed to send request to CalDAV server");
-
-        println!("Response status: {}", response.status());
-        println!("Response headers: {:#?}", response.headers());
-
-        // Check if we got a successful response or at least not a 401 Unauthorized
-        assert!(
-            response.status().is_success() || response.status() != 401,
-            "Authentication failed with status: {}. Check your credentials in .env",
-            response.status()
-        );
-
-        // For Baikal/CalDAV servers, we should see DAV headers
-        assert!(
-            response.headers().contains_key("dav") || 
-            response.headers().contains_key("DAV") ||
-            response.status().is_success(),
-            "Server doesn't appear to be a CalDAV server - missing DAV headers"
-        );
-
-        println!("✓ Authentication test passed!");
-    }
-
-    /// Test making a PROPFIND request to discover calendars
-    /// 
-    /// This test requires a valid .env file and makes an actual CalDAV PROPFIND request
-    /// 
-    /// Run with: `cargo test test_propfind_calendars`
-    #[tokio::test]
-    async fn test_propfind_calendars() {
-        let config = CalDAVConfig::from_env()
-            .expect("Failed to load CalDAV config from environment");
-
-        let client = reqwest::Client::new();
-
-        // CalDAV PROPFIND request to discover calendars
-        let propfind_body = r#"<?xml version="1.0" encoding="utf-8" ?>
-<d:propfind xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
-    <d:prop>
-        <d:resourcetype />
-        <d:displayname />
-        <c:calendar-description />
-        <c:supported-calendar-component-set />
-    </d:prop>
-</d:propfind>"#;
-
-        let response = client
-            .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &config.server_url)
-            .header("Authorization", format!("Basic {}", config.get_basic_auth()))
-            .header("Content-Type", "application/xml")
-            .header("Depth", "1")
-            .header("User-Agent", "calendar-app/0.1.0")
-            .body(propfind_body)
-            .send()
-            .await
-            .expect("Failed to send PROPFIND request");
-
-        let status = response.status();
-        println!("PROPFIND Response status: {}", status);
-        
-        let body = response.text().await.expect("Failed to read response body");
-        println!("PROPFIND Response body: {}", body);
-
-        // We should get a 207 Multi-Status for PROPFIND
-        assert_eq!(
-            status,
-            reqwest::StatusCode::from_u16(207).unwrap(),
-            "PROPFIND should return 207 Multi-Status"
-        );
-
-        // The response should contain XML with calendar information
-        assert!(body.contains("calendar"), "Response should contain calendar information");
-
-        println!("✓ PROPFIND calendars test passed!");
-    }
-}

frontend/src/main.rs

@@ -1,4 +1,3 @@
-
 mod app;
 mod auth;
 mod components;
@@ -9,4 +8,4 @@ use app::App;
 
 fn main() {
     yew::Renderer::<App>::new().render();
-}
+}

frontend/src/models/ical.rs

@@ -1,2 +1,2 @@
 // Re-export from shared calendar-models library for backward compatibility
-pub use calendar_models::*;
+pub use calendar_models::*;

frontend/src/models/mod.rs

@@ -1,5 +1,5 @@
 // RFC 5545 Compliant iCalendar Models
 pub mod ical;
 
-// Re-export commonly used types  
-// pub use ical::VEvent;
+// Re-export commonly used types
+// pub use ical::VEvent;

frontend/src/services/mod.rs

@@ -1,3 +1,5 @@
 pub mod calendar_service;
+pub mod preferences;
 
-pub use calendar_service::CalendarService;
+pub use calendar_service::CalendarService;
+pub use preferences::PreferencesService;

frontend/src/services/preferences.rs

@@ -0,0 +1,177 @@
+use gloo_storage::{LocalStorage, Storage};
+use serde::{Deserialize, Serialize};
+use serde_json;
+use wasm_bindgen::JsCast;
+use wasm_bindgen_futures::JsFuture;
+use web_sys::{Request, RequestInit, RequestMode, Response};
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct UserPreferences {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct UpdatePreferencesRequest {
+    pub calendar_selected_date: Option<String>,
+    pub calendar_time_increment: Option<i32>,
+    pub calendar_view_mode: Option<String>,
+    pub calendar_theme: Option<String>,
+    pub calendar_colors: Option<String>,
+}
+
+pub struct PreferencesService {
+    base_url: String,
+}
+
+impl PreferencesService {
+    pub fn new() -> Self {
+        let base_url = option_env!("BACKEND_API_URL")
+            .unwrap_or("http://localhost:3000/api")
+            .to_string();
+        
+        Self { base_url }
+    }
+    
+    /// Load preferences from LocalStorage (cached from login)
+    pub fn load_cached() -> Option<UserPreferences> {
+        if let Ok(prefs_json) = LocalStorage::get::<String>("user_preferences") {
+            serde_json::from_str(&prefs_json).ok()
+        } else {
+            None
+        }
+    }
+    
+    /// Update a single preference field and sync with backend
+    pub async fn update_preference(&self, field: &str, value: serde_json::Value) -> Result<(), String> {
+        // Get session token
+        let session_token = LocalStorage::get::<String>("session_token")
+            .map_err(|_| "No session token found".to_string())?;
+        
+        // Load current preferences
+        let mut preferences = Self::load_cached().unwrap_or(UserPreferences {
+            calendar_selected_date: None,
+            calendar_time_increment: None,
+            calendar_view_mode: None,
+            calendar_theme: None,
+            calendar_colors: None,
+        });
+        
+        // Update the specific field
+        match field {
+            "calendar_selected_date" => {
+                preferences.calendar_selected_date = value.as_str().map(|s| s.to_string());
+            }
+            "calendar_time_increment" => {
+                preferences.calendar_time_increment = value.as_i64().map(|i| i as i32);
+            }
+            "calendar_view_mode" => {
+                preferences.calendar_view_mode = value.as_str().map(|s| s.to_string());
+            }
+            "calendar_theme" => {
+                preferences.calendar_theme = value.as_str().map(|s| s.to_string());
+            }
+            "calendar_colors" => {
+                preferences.calendar_colors = value.as_str().map(|s| s.to_string());
+            }
+            _ => return Err(format!("Unknown preference field: {}", field)),
+        }
+        
+        // Save to LocalStorage cache
+        if let Ok(prefs_json) = serde_json::to_string(&preferences) {
+            let _ = LocalStorage::set("user_preferences", &prefs_json);
+        }
+        
+        // Sync with backend
+        let request = UpdatePreferencesRequest {
+            calendar_selected_date: preferences.calendar_selected_date.clone(),
+            calendar_time_increment: preferences.calendar_time_increment,
+            calendar_view_mode: preferences.calendar_view_mode.clone(),
+            calendar_theme: preferences.calendar_theme.clone(),
+            calendar_colors: preferences.calendar_colors.clone(),
+        };
+        
+        self.sync_preferences(&session_token, &request).await
+    }
+    
+    /// Sync all preferences with backend
+    async fn sync_preferences(
+        &self,
+        session_token: &str,
+        request: &UpdatePreferencesRequest,
+    ) -> Result<(), String> {
+        let window = web_sys::window().ok_or("No global window exists")?;
+        
+        let json_body = serde_json::to_string(request)
+            .map_err(|e| format!("JSON serialization failed: {}", e))?;
+        
+        let opts = RequestInit::new();
+        opts.set_method("POST");
+        opts.set_mode(RequestMode::Cors);
+        opts.set_body(&wasm_bindgen::JsValue::from_str(&json_body));
+        
+        let url = format!("{}/preferences", self.base_url);
+        let request = Request::new_with_str_and_init(&url, &opts)
+            .map_err(|e| format!("Request creation failed: {:?}", e))?;
+        
+        request
+            .headers()
+            .set("Content-Type", "application/json")
+            .map_err(|e| format!("Header setting failed: {:?}", e))?;
+        
+        request
+            .headers()
+            .set("X-Session-Token", session_token)
+            .map_err(|e| format!("Header setting failed: {:?}", e))?;
+        
+        let resp_value = JsFuture::from(window.fetch_with_request(&request))
+            .await
+            .map_err(|e| format!("Network request failed: {:?}", e))?;
+        
+        let resp: Response = resp_value
+            .dyn_into()
+            .map_err(|e| format!("Response cast failed: {:?}", e))?;
+        
+        if resp.ok() {
+            Ok(())
+        } else {
+            Err(format!("Failed to update preferences: {}", resp.status()))
+        }
+    }
+    
+    /// Migrate preferences from LocalStorage to backend (on first login after update)
+    pub async fn migrate_from_local_storage(&self) -> Result<(), String> {
+        let session_token = LocalStorage::get::<String>("session_token")
+            .map_err(|_| "No session token found".to_string())?;
+        
+        let mut request = UpdatePreferencesRequest {
+            calendar_selected_date: LocalStorage::get::<String>("calendar_selected_date").ok(),
+            calendar_time_increment: LocalStorage::get::<u32>("calendar_time_increment").ok().map(|i| i as i32),
+            calendar_view_mode: LocalStorage::get::<String>("calendar_view_mode").ok(),
+            calendar_theme: LocalStorage::get::<String>("calendar_theme").ok(),
+            calendar_colors: LocalStorage::get::<String>("calendar_colors").ok(),
+        };
+        
+        // Only migrate if we have some preferences to migrate
+        if request.calendar_selected_date.is_some()
+            || request.calendar_time_increment.is_some()
+            || request.calendar_view_mode.is_some()
+            || request.calendar_theme.is_some()
+            || request.calendar_colors.is_some()
+        {
+            self.sync_preferences(&session_token, &request).await?;
+            
+            // Clear old LocalStorage entries after successful migration
+            let _ = LocalStorage::delete("calendar_selected_date");
+            let _ = LocalStorage::delete("calendar_time_increment");
+            let _ = LocalStorage::delete("calendar_view_mode");
+            let _ = LocalStorage::delete("calendar_theme");
+            let _ = LocalStorage::delete("calendar_colors");
+        }
+        
+        Ok(())
+    }
+}

frontend/styles.css

@@ -289,6 +289,30 @@ body {
     cursor: not-allowed;
 }
 
+.remember-checkbox {
+    display: flex;
+    align-items: center;
+    gap: 0.375rem;
+    margin-top: 0.375rem;
+    opacity: 0.7;
+}
+
+.remember-checkbox input[type="checkbox"] {
+    width: auto;
+    margin: 0;
+    cursor: pointer;
+    transform: scale(0.85);
+}
+
+.remember-checkbox label {
+    margin: 0;
+    font-size: 0.75rem;
+    color: #888;
+    cursor: pointer;
+    user-select: none;
+    font-weight: 400;
+}
+
 .login-button, .register-button {
     width: 100%;
     padding: 0.75rem;