/**
 * NotificationContent.swift
 * 
 * Data structure for notification content
 * 
 * @author Matthew Raymer
 * @version 1.0.0
 */

import Foundation

/**
 * Data structure representing notification content
 * 
 * This class encapsulates all the information needed for a notification
 * including scheduling, content, and metadata.
 */
class NotificationContent {
    
    // MARK: - Properties
    
    let id: String
    let title: String?
    let body: String?
    let scheduledTime: TimeInterval // milliseconds since epoch
    let fetchedAt: TimeInterval // milliseconds since epoch
    let url: String?
    let payload: [String: Any]?
    let etag: String?
    
    // MARK: - Initialization
    
    /**
     * Initialize notification content
     * 
     * @param id Unique notification identifier
     * @param title Notification title
     * @param body Notification body text
     * @param scheduledTime When notification should fire (milliseconds since epoch)
     * @param fetchedAt When content was fetched (milliseconds since epoch)
     * @param url URL for content fetching
     * @param payload Additional payload data
     * @param etag ETag for HTTP caching
     */
    init(id: String, 
         title: String?, 
         body: String?, 
         scheduledTime: TimeInterval, 
         fetchedAt: TimeInterval, 
         url: String?, 
         payload: [String: Any]?, 
         etag: String?) {
        
        self.id = id
        self.title = title
        self.body = body
        self.scheduledTime = scheduledTime
        self.fetchedAt = fetchedAt
        self.url = url
        self.payload = payload
        self.etag = etag
    }
    
    // MARK: - Convenience Methods
    
    /**
     * Get scheduled time as Date
     * 
     * @return Scheduled time as Date object
     */
    func getScheduledTimeAsDate() -> Date {
        return Date(timeIntervalSince1970: scheduledTime / 1000)
    }
    
    /**
     * Get fetched time as Date
     * 
     * @return Fetched time as Date object
     */
    func getFetchedTimeAsDate() -> Date {
        return Date(timeIntervalSince1970: fetchedAt / 1000)
    }
    
    /**
     * Check if notification is scheduled for today
     * 
     * @return true if scheduled for today
     */
    func isScheduledForToday() -> Bool {
        let scheduledDate = getScheduledTimeAsDate()
        let today = Date()
        
        let calendar = Calendar.current
        return calendar.isDate(scheduledDate, inSameDayAs: today)
    }
    
    /**
     * Check if notification is scheduled for tomorrow
     * 
     * @return true if scheduled for tomorrow
     */
    func isScheduledForTomorrow() -> Bool {
        let scheduledDate = getScheduledTimeAsDate()
        let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: Date()) ?? Date()
        
        let calendar = Calendar.current
        return calendar.isDate(scheduledDate, inSameDayAs: tomorrow)
    }
    
    /**
     * Check if notification is in the future
     * 
     * @return true if scheduled time is in the future
     */
    func isInTheFuture() -> Bool {
        return scheduledTime > Date().timeIntervalSince1970 * 1000
    }
    
    /**
     * Get age of content at scheduled time
     * 
     * @return Age in seconds at scheduled time
     */
    func getAgeAtScheduledTime() -> TimeInterval {
        return (scheduledTime - fetchedAt) / 1000
    }
    
    /**
     * Convert to dictionary representation
     * 
     * @return Dictionary representation of notification content
     */
    func toDictionary() -> [String: Any] {
        return [
            "id": id,
            "title": title ?? "",
            "body": body ?? "",
            "scheduledTime": scheduledTime,
            "fetchedAt": fetchedAt,
            "url": url ?? "",
            "payload": payload ?? [:],
            "etag": etag ?? ""
        ]
    }
    
    /**
     * Create from dictionary representation
     * 
     * @param dict Dictionary representation
     * @return NotificationContent instance
     */
    static func fromDictionary(_ dict: [String: Any]) -> NotificationContent? {
        guard let id = dict["id"] as? String,
              let scheduledTime = dict["scheduledTime"] as? TimeInterval,
              let fetchedAt = dict["fetchedAt"] as? TimeInterval else {
            return nil
        }
        
        return NotificationContent(
            id: id,
            title: dict["title"] as? String,
            body: dict["body"] as? String,
            scheduledTime: scheduledTime,
            fetchedAt: fetchedAt,
            url: dict["url"] as? String,
            payload: dict["payload"] as? [String: Any],
            etag: dict["etag"] as? String
        )
    }
}