/**
 * DailyNotificationPlugin.swift
 * 
 * Main iOS plugin class for handling daily notifications
 * 
 * @author Matthew Raymer
 * @version 1.0.0
 */

import Foundation
import Capacitor
import BackgroundTasks
import UserNotifications

@objc(DailyNotificationPlugin)
public class DailyNotificationPlugin: CAPPlugin {
    
    private static let TAG = "DailyNotificationPlugin"
    
    private var database: DailyNotificationDatabase?
    private var ttlEnforcer: DailyNotificationTTLEnforcer?
    private var rollingWindow: DailyNotificationRollingWindow?
    private var backgroundTaskManager: DailyNotificationBackgroundTaskManager?
    
    private var useSharedStorage: Bool = false
    private var databasePath: String?
    private var ttlSeconds: TimeInterval = 3600
    private var prefetchLeadMinutes: Int = 15
    
    public override func load() {
        super.load()
        print("\(Self.TAG): DailyNotificationPlugin loading")
        initializeComponents()
        
        if #available(iOS 13.0, *) {
            backgroundTaskManager?.registerBackgroundTask()
        }
        
        print("\(Self.TAG): DailyNotificationPlugin loaded successfully")
    }
    
    private func initializeComponents() {
        if useSharedStorage, let databasePath = databasePath {
            database = DailyNotificationDatabase(path: databasePath)
        }
        
        ttlEnforcer = DailyNotificationTTLEnforcer(database: database, useSharedStorage: useSharedStorage)
        
        rollingWindow = DailyNotificationRollingWindow(ttlEnforcer: ttlEnforcer!, 
                                                      database: database, 
                                                      useSharedStorage: useSharedStorage)
        
        if #available(iOS 13.0, *) {
            backgroundTaskManager = DailyNotificationBackgroundTaskManager(database: database, 
                                                                           ttlEnforcer: ttlEnforcer!, 
                                                                           rollingWindow: rollingWindow!)
        }
        
        print("\(Self.TAG): All components initialized successfully")
    }
    
    @objc func configure(_ call: CAPPluginCall) {
        print("\(Self.TAG): Configuring plugin")
        
        if let dbPath = call.getString("dbPath") {
            databasePath = dbPath
        }
        
        if let storage = call.getString("storage") {
            useSharedStorage = (storage == "shared")
        }
        
        if let ttl = call.getDouble("ttlSeconds") {
            ttlSeconds = ttl
        }
        
        if let leadMinutes = call.getInt("prefetchLeadMinutes") {
            prefetchLeadMinutes = leadMinutes
        }
        
        storeConfiguration()
        initializeComponents()
        call.resolve()
    }
    
    private func storeConfiguration() {
        if useSharedStorage, let database = database {
            // Store in SQLite
            print("\(Self.TAG): Storing configuration in SQLite")
        } else {
            // Store in UserDefaults
            UserDefaults.standard.set(databasePath, forKey: "databasePath")
            UserDefaults.standard.set(useSharedStorage, forKey: "useSharedStorage")
            UserDefaults.standard.set(ttlSeconds, forKey: "ttlSeconds")
            UserDefaults.standard.set(prefetchLeadMinutes, forKey: "prefetchLeadMinutes")
        }
    }
    
    @objc func maintainRollingWindow(_ call: CAPPluginCall) {
        print("\(Self.TAG): Manual rolling window maintenance requested")
        
        if let rollingWindow = rollingWindow {
            rollingWindow.forceMaintenance()
            call.resolve()
        } else {
            call.reject("Rolling window not initialized")
        }
    }
    
    @objc func getRollingWindowStats(_ call: CAPPluginCall) {
        print("\(Self.TAG): Rolling window stats requested")
        
        if let rollingWindow = rollingWindow {
            let stats = rollingWindow.getRollingWindowStats()
            let result = [
                "stats": stats,
                "maintenanceNeeded": rollingWindow.isMaintenanceNeeded(),
                "timeUntilNextMaintenance": rollingWindow.getTimeUntilNextMaintenance()
            ] as [String : Any]
            
            call.resolve(result)
        } else {
            call.reject("Rolling window not initialized")
        }
    }
    
    @objc func scheduleBackgroundTask(_ call: CAPPluginCall) {
        print("\(Self.TAG): Scheduling background task")
        
        guard let scheduledTimeString = call.getString("scheduledTime") else {
            call.reject("scheduledTime parameter is required")
            return
        }
        
        let formatter = DateFormatter()
        formatter.dateFormat = "HH:mm"
        guard let scheduledTime = formatter.date(from: scheduledTimeString) else {
            call.reject("Invalid scheduledTime format")
            return
        }
        
        if #available(iOS 13.0, *) {
            backgroundTaskManager?.scheduleBackgroundTask(scheduledTime: scheduledTime, 
                                                        prefetchLeadMinutes: prefetchLeadMinutes)
            call.resolve()
        } else {
            call.reject("Background tasks not available on this iOS version")
        }
    }
    
    @objc func getBackgroundTaskStatus(_ call: CAPPluginCall) {
        print("\(Self.TAG): Background task status requested")
        
        if #available(iOS 13.0, *) {
            let status = backgroundTaskManager?.getBackgroundTaskStatus() ?? [:]
            call.resolve(status)
        } else {
            call.resolve(["available": false, "reason": "iOS version not supported"])
        }
    }
    
    @objc func cancelAllBackgroundTasks(_ call: CAPPluginCall) {
        print("\(Self.TAG): Cancelling all background tasks")
        
        if #available(iOS 13.0, *) {
            backgroundTaskManager?.cancelAllBackgroundTasks()
            call.resolve()
        } else {
            call.reject("Background tasks not available on this iOS version")
        }
    }
    
    @objc func getTTLViolationStats(_ call: CAPPluginCall) {
        print("\(Self.TAG): TTL violation stats requested")
        
        if let ttlEnforcer = ttlEnforcer {
            let stats = ttlEnforcer.getTTLViolationStats()
            call.resolve(["stats": stats])
        } else {
            call.reject("TTL enforcer not initialized")
        }
    }
    
    @objc func scheduleDailyNotification(_ call: CAPPluginCall) {
        print("\(Self.TAG): Scheduling daily notification")
        
        guard let time = call.getString("time") else {
            call.reject("Time parameter is required")
            return
        }
        
        let formatter = DateFormatter()
        formatter.dateFormat = "HH:mm"
        guard let scheduledTime = formatter.date(from: time) else {
            call.reject("Invalid time format")
            return
        }
        
        let notification = NotificationContent(
            id: UUID().uuidString,
            title: call.getString("title") ?? "Daily Update",
            body: call.getString("body") ?? "Your daily notification is ready",
            scheduledTime: scheduledTime.timeIntervalSince1970 * 1000,
            fetchedAt: Date().timeIntervalSince1970 * 1000,
            url: call.getString("url"),
            payload: nil,
            etag: nil
        )
        
        if let ttlEnforcer = ttlEnforcer, !ttlEnforcer.validateBeforeArming(notification) {
            call.reject("Notification content violates TTL")
            return
        }
        
        scheduleNotification(notification)
        
        if #available(iOS 13.0, *) {
            backgroundTaskManager?.scheduleBackgroundTask(scheduledTime: scheduledTime, 
                                                        prefetchLeadMinutes: prefetchLeadMinutes)
        }
        
        call.resolve()
    }
    
    private func scheduleNotification(_ notification: NotificationContent) {
        let content = UNMutableNotificationContent()
        content.title = notification.title ?? "Daily Notification"
        content.body = notification.body ?? "Your daily notification is ready"
        content.sound = UNNotificationSound.default
        
        let scheduledTime = Date(timeIntervalSince1970: notification.scheduledTime / 1000)
        let trigger = UNCalendarNotificationTrigger(dateMatching: Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: scheduledTime), repeats: false)
        
        let request = UNNotificationRequest(identifier: notification.id, content: content, trigger: trigger)
        
        UNUserNotificationCenter.current().add(request) { error in
            if let error = error {
                print("\(Self.TAG): Failed to schedule notification \(notification.id): \(error)")
            } else {
                print("\(Self.TAG): Successfully scheduled notification: \(notification.id)")
            }
        }
    }
    
    @objc func getLastNotification(_ call: CAPPluginCall) {
        let result = [
            "id": "placeholder",
            "title": "Last Notification",
            "body": "This is a placeholder",
            "timestamp": Date().timeIntervalSince1970 * 1000
        ] as [String : Any]
        
        call.resolve(result)
    }
    
    @objc func cancelAllNotifications(_ call: CAPPluginCall) {
        UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
        call.resolve()
    }
}