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 std::sync::Arc;

/// 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
            let jwt_secret = "test-secret-key-for-integration-tests".to_string();
            let auth_service = AuthService::new(jwt_secret);
            let app_state = AppState { auth_service };

            // Build application with routes
            let app = Router::new()
                .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))
                .layer(
                    CorsLayer::new()
                        .allow_origin(Any)
                        .allow_methods(Any)
                        .allow_headers(Any),
                )
                .with_state(Arc::new(app_state));

            // Start server on a random port
            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())
            });
            
            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());
            
            let login_response: serde_json::Value = response.json().await.unwrap();
            login_response["token"].as_str().expect("Login response should contain token").to_string()
        }
    }
    
    async fn root() -> &'static str {
        "Calendar Backend API v0.1.0"
    }

    async fn health_check() -> Json<serde_json::Value> {
        Json(serde_json::json!({
            "status": "healthy",
            "service": "calendar-backend",
            "version": "0.1.0"
        }))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use super::test_utils::*;

    /// Test the health endpoint
    #[tokio::test]
    async fn test_health_endpoint() {
        let server = TestServer::start().await;
        
        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");
    }

    /// Test authentication login endpoint
    #[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());
        
        let login_payload = json!({
            "username": username,
            "password": password,
            "server_url": server_url
        });
        
        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());
        
        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");
        
        println!("✓ Authentication login test passed");
    }

    /// Test authentication verify endpoint  
    #[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
            .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] 
    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
            .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());
        }
    }

    /// Test calendar events listing endpoint
    #[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  
        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))
            .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());
        
        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());
    }

    /// 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());
        
        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_time": "11:00",
            "location": "Test Location",
            "all_day": false,
            "status": "confirmed",
            "class": "public",
            "priority": 5,
            "organizer": "test@example.com",
            "attendees": "",
            "categories": "test",
            "reminder": "15min",
            "recurrence": "none",
            "recurrence_days": [false, false, false, false, false, false, false]
        });
        
        let response = server.client
            .post(&format!("{}/api/calendar/events/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 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();
            assert!(create_response["success"].as_bool().unwrap_or(false));
            println!("✓ Create event test passed");
        } else {
            println!("⚠ Create event test skipped (CalDAV server not accessible)");
        }
    }

    /// Test event refresh endpoint
    #[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());
        
        // 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))
            .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());
               
        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
            .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());
        println!("✓ Invalid authentication test passed");
    }

    /// Test missing authentication
    #[tokio::test]
    async fn test_missing_auth() {
        let server = TestServer::start().await;
        
        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");
    }
}