// Simplified RFC 5545-based API models
// Axum imports removed - not needed for model definitions
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};

// ==================== CALENDAR REQUESTS ====================

#[derive(Debug, Deserialize)]
pub struct CreateCalendarRequestV2 {
    pub name: String,
    pub description: Option<String>,
    pub color: Option<String>,
}

#[derive(Debug, Deserialize)]
pub struct DeleteCalendarRequestV2 {
    pub path: String,
}

// ==================== EVENT REQUESTS ====================

// Simplified create event request using proper DateTime instead of string parsing
#[derive(Debug, Deserialize)]
pub struct CreateEventRequestV2 {
    pub summary: String,                   // title -> summary (RFC 5545 term)
    pub description: Option<String>,       // Optional in RFC 5545
    pub dtstart: DateTime<Utc>,           // Direct DateTime, no string parsing!
    pub dtend: Option<DateTime<Utc>>,     // Optional, alternative to duration
    pub location: Option<String>,
    pub all_day: bool,
    
    // Status and classification
    pub status: Option<EventStatusV2>,     // Use enum instead of string
    pub class: Option<EventClassV2>,       // Use enum instead of string
    pub priority: Option<u8>,              // 0-9 priority level
    
    // People
    pub organizer: Option<String>,         // Organizer email
    pub attendees: Vec<AttendeeV2>,        // Rich attendee objects
    
    // Categorization
    pub categories: Vec<String>,           // Direct Vec instead of comma-separated
    
    // Recurrence (simplified for now)
    pub rrule: Option<String>,            // Standard RRULE format
    
    // Reminders (simplified for now) 
    pub alarms: Vec<AlarmV2>,             // Structured alarms
    
    // Calendar context
    pub calendar_path: Option<String>,
}

#[derive(Debug, Deserialize)]
pub struct UpdateEventRequestV2 {
    pub uid: String,                      // Event UID to identify which event to update
    pub summary: String,                  
    pub description: Option<String>,      
    pub dtstart: DateTime<Utc>,          // Direct DateTime, no string parsing!
    pub dtend: Option<DateTime<Utc>>,    
    pub location: Option<String>,
    pub all_day: bool,
    
    // Status and classification
    pub status: Option<EventStatusV2>,    
    pub class: Option<EventClassV2>,      
    pub priority: Option<u8>,             
    
    // People
    pub organizer: Option<String>,        
    pub attendees: Vec<AttendeeV2>,       
    
    // Categorization
    pub categories: Vec<String>,          
    
    // Recurrence
    pub rrule: Option<String>,           
    
    // Reminders
    pub alarms: Vec<AlarmV2>,            
    
    // Context
    pub calendar_path: Option<String>,
    pub update_action: Option<String>,    // "update_series" for recurring events
    pub occurrence_date: Option<DateTime<Utc>>, // Specific occurrence
    pub exception_dates: Option<Vec<DateTime<Utc>>>, // EXDATE
    pub until_date: Option<DateTime<Utc>>, // RRULE UNTIL clause
}

#[derive(Debug, Deserialize)]
pub struct DeleteEventRequestV2 {
    pub calendar_path: String,
    pub event_href: String,
    pub delete_action: DeleteActionV2,    // Use enum instead of string
    pub occurrence_date: Option<DateTime<Utc>>, // Direct DateTime
}

// ==================== SUPPORTING TYPES ====================

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum EventStatusV2 {
    Tentative,
    Confirmed,
    Cancelled,
}

impl Default for EventStatusV2 {
    fn default() -> Self {
        EventStatusV2::Confirmed
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum EventClassV2 {
    Public,
    Private,
    Confidential,
}

impl Default for EventClassV2 {
    fn default() -> Self {
        EventClassV2::Public
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum DeleteActionV2 {
    DeleteThis,      // "delete_this"
    DeleteFollowing, // "delete_following" 
    DeleteSeries,    // "delete_series"
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct AttendeeV2 {
    pub email: String,                    // Calendar address
    pub name: Option<String>,             // Common name (CN parameter)
    pub role: Option<AttendeeRoleV2>,     // Role (ROLE parameter)
    pub status: Option<ParticipationStatusV2>, // Participation status (PARTSTAT parameter)
    pub rsvp: Option<bool>,               // RSVP expectation (RSVP parameter)
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum AttendeeRoleV2 {
    Chair,
    Required,         // REQ-PARTICIPANT
    Optional,         // OPT-PARTICIPANT  
    NonParticipant,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum ParticipationStatusV2 {
    NeedsAction,
    Accepted,
    Declined,
    Tentative,
    Delegated,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct AlarmV2 {
    pub action: AlarmActionV2,            // Action (AUDIO, DISPLAY, EMAIL)
    pub trigger_minutes: i32,             // Minutes before event (negative = before)
    pub description: Option<String>,      // Description for display/email
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum AlarmActionV2 {
    Audio,
    Display,
    Email,
}

// ==================== RESPONSES ====================

#[derive(Debug, Serialize)]
pub struct CreateEventResponseV2 {
    pub success: bool,
    pub message: String,
    pub event: Option<EventSummaryV2>,    // Return created event summary
}

#[derive(Debug, Serialize)]
pub struct UpdateEventResponseV2 {
    pub success: bool,
    pub message: String,
    pub event: Option<EventSummaryV2>,    // Return updated event summary
}

#[derive(Debug, Serialize)]
pub struct DeleteEventResponseV2 {
    pub success: bool,
    pub message: String,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct EventSummaryV2 {
    pub uid: String,
    pub summary: Option<String>,
    pub dtstart: DateTime<Utc>,
    pub dtend: Option<DateTime<Utc>>,
    pub location: Option<String>,
    pub all_day: bool,
    pub href: Option<String>,
    pub etag: Option<String>,
}

// ==================== CONVERSION HELPERS ====================

// Convert from old request format to new for backward compatibility
impl From<crate::models::CreateEventRequest> for CreateEventRequestV2 {
    fn from(old: crate::models::CreateEventRequest) -> Self {
        use chrono::{NaiveDate, NaiveTime, TimeZone, Utc};
        
        // Parse the old string-based date/time format
        let start_date = NaiveDate::parse_from_str(&old.start_date, "%Y-%m-%d")
            .unwrap_or_else(|_| chrono::Utc::now().date_naive());
        let start_time = NaiveTime::parse_from_str(&old.start_time, "%H:%M")
            .unwrap_or_else(|_| NaiveTime::from_hms_opt(0, 0, 0).unwrap());
        let dtstart = Utc.from_utc_datetime(&start_date.and_time(start_time));
        
        let end_date = NaiveDate::parse_from_str(&old.end_date, "%Y-%m-%d")
            .unwrap_or_else(|_| chrono::Utc::now().date_naive());
        let end_time = NaiveTime::parse_from_str(&old.end_time, "%H:%M")
            .unwrap_or_else(|_| NaiveTime::from_hms_opt(1, 0, 0).unwrap());
        let dtend = Some(Utc.from_utc_datetime(&end_date.and_time(end_time)));
        
        // Parse comma-separated categories
        let categories: Vec<String> = if old.categories.trim().is_empty() {
            Vec::new()
        } else {
            old.categories.split(',').map(|s| s.trim().to_string()).collect()
        };
        
        // Parse comma-separated attendees
        let attendees: Vec<AttendeeV2> = if old.attendees.trim().is_empty() {
            Vec::new()
        } else {
            old.attendees.split(',').map(|email| AttendeeV2 {
                email: email.trim().to_string(),
                name: None,
                role: Some(AttendeeRoleV2::Required),
                status: Some(ParticipationStatusV2::NeedsAction),
                rsvp: Some(true),
            }).collect()
        };
        
        // Convert status string to enum
        let status = match old.status.as_str() {
            "tentative" => Some(EventStatusV2::Tentative),
            "confirmed" => Some(EventStatusV2::Confirmed),
            "cancelled" => Some(EventStatusV2::Cancelled),
            _ => Some(EventStatusV2::Confirmed),
        };
        
        // Convert class string to enum
        let class = match old.class.as_str() {
            "public" => Some(EventClassV2::Public),
            "private" => Some(EventClassV2::Private),
            "confidential" => Some(EventClassV2::Confidential),
            _ => Some(EventClassV2::Public),
        };
        
        // Create basic alarm if reminder specified
        let alarms = if old.reminder == "none" {
            Vec::new()
        } else {
            // Default to 15 minutes before for now
            vec![AlarmV2 {
                action: AlarmActionV2::Display,
                trigger_minutes: 15,
                description: Some("Event reminder".to_string()),
            }]
        };
        
        Self {
            summary: old.title,
            description: if old.description.trim().is_empty() { None } else { Some(old.description) },
            dtstart,
            dtend,
            location: if old.location.trim().is_empty() { None } else { Some(old.location) },
            all_day: old.all_day,
            status,
            class,
            priority: old.priority,
            organizer: if old.organizer.trim().is_empty() { None } else { Some(old.organizer) },
            attendees,
            categories,
            rrule: None, // TODO: Convert recurrence string to RRULE
            alarms,
            calendar_path: old.calendar_path,
        }
    }
}

// Error handling - ApiError is available through crate::models::ApiError in handlers