//
//  DailyNotificationPlugin.swift
//  DailyNotificationPlugin
//
//  Created by Matthew Raymer on 2025-09-22
//  Copyright © 2025 TimeSafari. All rights reserved.
//

import Foundation
import Capacitor
import UserNotifications
import BackgroundTasks
import CoreData

/**
 * iOS implementation of Daily Notification Plugin
 * Implements BGTaskScheduler + UNUserNotificationCenter for dual scheduling
 * 
 * @author Matthew Raymer
 * @version 1.1.0
 * @created 2025-09-22 09:22:32 UTC
 */
@objc(DailyNotificationPlugin)
public class DailyNotificationPlugin: CAPPlugin {
    
    private let notificationCenter = UNUserNotificationCenter.current()
    private let backgroundTaskScheduler = BGTaskScheduler.shared
    private let persistenceController = PersistenceController.shared
    
    // Background task identifiers
    private let fetchTaskIdentifier = "com.timesafari.dailynotification.fetch"
    private let notifyTaskIdentifier = "com.timesafari.dailynotification.notify"
    
    override public func load() {
        super.load()
        setupBackgroundTasks()
        print("DNP-PLUGIN: Daily Notification Plugin loaded on iOS")
    }
    
    // MARK: - Configuration Methods
    
    @objc func configure(_ call: CAPPluginCall) {
        guard let options = call.getObject("options") else {
            call.reject("Configuration options required")
            return
        }
        
        print("DNP-PLUGIN: Configure called with options: \(options)")
        
        // Store configuration in UserDefaults
        UserDefaults.standard.set(options, forKey: "DailyNotificationConfig")
        
        call.resolve()
    }
    
    // MARK: - Dual Scheduling Methods
    
    @objc func scheduleContentFetch(_ call: CAPPluginCall) {
        guard let config = call.getObject("config") else {
            call.reject("Content fetch config required")
            return
        }
        
        print("DNP-PLUGIN: Scheduling content fetch")
        
        do {
            try scheduleBackgroundFetch(config: config)
            call.resolve()
        } catch {
            print("DNP-PLUGIN: Failed to schedule content fetch: \(error)")
            call.reject("Content fetch scheduling failed: \(error.localizedDescription)")
        }
    }
    
    @objc func scheduleUserNotification(_ call: CAPPluginCall) {
        guard let config = call.getObject("config") else {
            call.reject("User notification config required")
            return
        }
        
        print("DNP-PLUGIN: Scheduling user notification")
        
        do {
            try scheduleUserNotification(config: config)
            call.resolve()
        } catch {
            print("DNP-PLUGIN: Failed to schedule user notification: \(error)")
            call.reject("User notification scheduling failed: \(error.localizedDescription)")
        }
    }
    
    @objc func scheduleDualNotification(_ call: CAPPluginCall) {
        guard let config = call.getObject("config"),
              let contentFetchConfig = config["contentFetch"] as? [String: Any],
              let userNotificationConfig = config["userNotification"] as? [String: Any] else {
            call.reject("Dual notification config required")
            return
        }
        
        print("DNP-PLUGIN: Scheduling dual notification")
        
        do {
            try scheduleBackgroundFetch(config: contentFetchConfig)
            try scheduleUserNotification(config: userNotificationConfig)
            call.resolve()
        } catch {
            print("DNP-PLUGIN: Failed to schedule dual notification: \(error)")
            call.reject("Dual notification scheduling failed: \(error.localizedDescription)")
        }
    }
    
    @objc func getDualScheduleStatus(_ call: CAPPluginCall) {
        Task {
            do {
                let status = try await getHealthStatus()
                call.resolve(status)
            } catch {
                print("DNP-PLUGIN: Failed to get dual schedule status: \(error)")
                call.reject("Status retrieval failed: \(error.localizedDescription)")
            }
        }
    }
    
    // MARK: - Private Implementation Methods
    
    private func setupBackgroundTasks() {
        // Register background fetch task
        backgroundTaskScheduler.register(forTaskWithIdentifier: fetchTaskIdentifier, using: nil) { task in
            self.handleBackgroundFetch(task: task as! BGAppRefreshTask)
        }
        
        // Register background processing task
        backgroundTaskScheduler.register(forTaskWithIdentifier: notifyTaskIdentifier, using: nil) { task in
            self.handleBackgroundNotify(task: task as! BGProcessingTask)
        }
    }
    
    private func scheduleBackgroundFetch(config: [String: Any]) throws {
        let request = BGAppRefreshTaskRequest(identifier: fetchTaskIdentifier)
        
        // Calculate next run time (simplified - would use proper cron parsing in production)
        let nextRunTime = calculateNextRunTime(from: config["schedule"] as? String ?? "0 9 * * *")
        request.earliestBeginDate = Date(timeIntervalSinceNow: nextRunTime)
        
        try backgroundTaskScheduler.submit(request)
        print("DNP-FETCH-SCHEDULE: Background fetch scheduled for \(request.earliestBeginDate!)")
    }
    
    private func scheduleUserNotification(config: [String: Any]) throws {
        let content = UNMutableNotificationContent()
        content.title = config["title"] as? String ?? "Daily Notification"
        content.body = config["body"] as? String ?? "Your daily update is ready"
        content.sound = (config["sound"] as? Bool ?? true) ? .default : nil
        
        // Create trigger (simplified - would use proper cron parsing in production)
        let nextRunTime = calculateNextRunTime(from: config["schedule"] as? String ?? "0 9 * * *")
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: nextRunTime, repeats: false)
        
        let request = UNNotificationRequest(
            identifier: "daily-notification-\(Date().timeIntervalSince1970)",
            content: content,
            trigger: trigger
        )
        
        notificationCenter.add(request) { error in
            if let error = error {
                print("DNP-NOTIFY-SCHEDULE: Failed to schedule notification: \(error)")
            } else {
                print("DNP-NOTIFY-SCHEDULE: Notification scheduled successfully")
            }
        }
    }
    
    private func calculateNextRunTime(from schedule: String) -> TimeInterval {
        // Simplified implementation - would use proper cron parsing in production
        // For now, return next day at 9 AM
        return 86400 // 24 hours
    }

    // MARK: - Static Daily Reminder Methods

    @objc func scheduleDailyReminder(_ call: CAPPluginCall) {
        guard let id = call.getString("id"),
              let title = call.getString("title"),
              let body = call.getString("body"),
              let time = call.getString("time") else {
            call.reject("Missing required parameters: id, title, body, time")
            return
        }

        let sound = call.getBool("sound", true)
        let vibration = call.getBool("vibration", true)
        let priority = call.getString("priority", "normal")
        let repeatDaily = call.getBool("repeatDaily", true)
        let timezone = call.getString("timezone")

        print("DNP-REMINDER: Scheduling daily reminder: \(id)")

        // Parse time (HH:mm format)
        let timeComponents = time.components(separatedBy: ":")
        guard timeComponents.count == 2,
              let hour = Int(timeComponents[0]),
              let minute = Int(timeComponents[1]),
              hour >= 0 && hour <= 23,
              minute >= 0 && minute <= 59 else {
            call.reject("Invalid time format. Use HH:mm (e.g., 09:00)")
            return
        }

        // Create notification content
        let content = UNMutableNotificationContent()
        content.title = title
        content.body = body
        content.sound = sound ? .default : nil
        content.categoryIdentifier = "DAILY_REMINDER"

        // Set priority
        switch priority {
        case "high":
            content.interruptionLevel = .critical
        case "low":
            content.interruptionLevel = .passive
        default:
            content.interruptionLevel = .active
        }

        // Create date components for daily trigger
        var dateComponents = DateComponents()
        dateComponents.hour = hour
        dateComponents.minute = minute

        let trigger = UNCalendarNotificationTrigger(
            dateMatching: dateComponents,
            repeats: repeatDaily
        )

        let request = UNNotificationRequest(
            identifier: "reminder_\(id)",
            content: content,
            trigger: trigger
        )

        // Store reminder in UserDefaults
        storeReminderInUserDefaults(
            id: id,
            title: title,
            body: body,
            time: time,
            sound: sound,
            vibration: vibration,
            priority: priority,
            repeatDaily: repeatDaily,
            timezone: timezone
        )

        // Schedule the notification
        notificationCenter.add(request) { error in
            DispatchQueue.main.async {
                if let error = error {
                    print("DNP-REMINDER: Failed to schedule reminder: \(error)")
                    call.reject("Failed to schedule daily reminder: \(error.localizedDescription)")
                } else {
                    print("DNP-REMINDER: Daily reminder scheduled successfully: \(id)")
                    call.resolve()
                }
            }
        }
    }

    @objc func cancelDailyReminder(_ call: CAPPluginCall) {
        guard let reminderId = call.getString("reminderId") else {
            call.reject("Missing reminderId parameter")
            return
        }

        print("DNP-REMINDER: Cancelling daily reminder: \(reminderId)")

        // Cancel the notification
        notificationCenter.removePendingNotificationRequests(withIdentifiers: ["reminder_\(reminderId)"])

        // Remove from UserDefaults
        removeReminderFromUserDefaults(id: reminderId)

        call.resolve()
    }

    @objc func getScheduledReminders(_ call: CAPPluginCall) {
        print("DNP-REMINDER: Getting scheduled reminders")

        // Get pending notifications
        notificationCenter.getPendingNotificationRequests { requests in
            let reminderRequests = requests.filter { $0.identifier.hasPrefix("reminder_") }

            // Get stored reminder data from UserDefaults
            let reminders = self.getRemindersFromUserDefaults()

            var result: [[String: Any]] = []
            for reminder in reminders {
                let isScheduled = reminderRequests.contains { $0.identifier == "reminder_\(reminder["id"] as! String)" }
                var reminderInfo = reminder
                reminderInfo["isScheduled"] = isScheduled
                result.append(reminderInfo)
            }

            DispatchQueue.main.async {
                call.resolve(["reminders": result])
            }
        }
    }

    @objc func updateDailyReminder(_ call: CAPPluginCall) {
        guard let reminderId = call.getString("reminderId") else {
            call.reject("Missing reminderId parameter")
            return
        }

        print("DNP-REMINDER: Updating daily reminder: \(reminderId)")

        // Cancel existing reminder
        notificationCenter.removePendingNotificationRequests(withIdentifiers: ["reminder_\(reminderId)"])

        // Update in UserDefaults
        let title = call.getString("title")
        let body = call.getString("body")
        let time = call.getString("time")
        let sound = call.getBool("sound")
        let vibration = call.getBool("vibration")
        let priority = call.getString("priority")
        let repeatDaily = call.getBool("repeatDaily")
        let timezone = call.getString("timezone")

        updateReminderInUserDefaults(
            id: reminderId,
            title: title,
            body: body,
            time: time,
            sound: sound,
            vibration: vibration,
            priority: priority,
            repeatDaily: repeatDaily,
            timezone: timezone
        )

        // Reschedule with new settings if all required fields are provided
        if let title = title, let body = body, let time = time {
            // Parse time
            let timeComponents = time.components(separatedBy: ":")
            guard timeComponents.count == 2,
                  let hour = Int(timeComponents[0]),
                  let minute = Int(timeComponents[1]) else {
                call.reject("Invalid time format")
                return
            }

            // Create new notification content
            let content = UNMutableNotificationContent()
            content.title = title
            content.body = body
            content.sound = (sound ?? true) ? .default : nil
            content.categoryIdentifier = "DAILY_REMINDER"

            // Set priority
            let finalPriority = priority ?? "normal"
            switch finalPriority {
            case "high":
                content.interruptionLevel = .critical
            case "low":
                content.interruptionLevel = .passive
            default:
                content.interruptionLevel = .active
            }

            // Create date components for daily trigger
            var dateComponents = DateComponents()
            dateComponents.hour = hour
            dateComponents.minute = minute

            let trigger = UNCalendarNotificationTrigger(
                dateMatching: dateComponents,
                repeats: repeatDaily ?? true
            )

            let request = UNNotificationRequest(
                identifier: "reminder_\(reminderId)",
                content: content,
                trigger: trigger
            )

            // Schedule the updated notification
            notificationCenter.add(request) { error in
                DispatchQueue.main.async {
                    if let error = error {
                        call.reject("Failed to reschedule updated reminder: \(error.localizedDescription)")
                    } else {
                        call.resolve()
                    }
                }
            }
        } else {
            call.resolve()
        }
    }

    // MARK: - Helper Methods for Reminder Storage

    private func storeReminderInUserDefaults(
        id: String,
        title: String,
        body: String,
        time: String,
        sound: Bool,
        vibration: Bool,
        priority: String,
        repeatDaily: Bool,
        timezone: String?
    ) {
        let reminderData: [String: Any] = [
            "id": id,
            "title": title,
            "body": body,
            "time": time,
            "sound": sound,
            "vibration": vibration,
            "priority": priority,
            "repeatDaily": repeatDaily,
            "timezone": timezone ?? "",
            "createdAt": Date().timeIntervalSince1970,
            "lastTriggered": 0
        ]

        var reminders = UserDefaults.standard.array(forKey: "daily_reminders") as? [[String: Any]] ?? []
        reminders.append(reminderData)
        UserDefaults.standard.set(reminders, forKey: "daily_reminders")

        print("DNP-REMINDER: Reminder stored: \(id)")
    }

    private func removeReminderFromUserDefaults(id: String) {
        var reminders = UserDefaults.standard.array(forKey: "daily_reminders") as? [[String: Any]] ?? []
        reminders.removeAll { ($0["id"] as? String) == id }
        UserDefaults.standard.set(reminders, forKey: "daily_reminders")

        print("DNP-REMINDER: Reminder removed: \(id)")
    }

    private func getRemindersFromUserDefaults() -> [[String: Any]] {
        return UserDefaults.standard.array(forKey: "daily_reminders") as? [[String: Any]] ?? []
    }

    private func updateReminderInUserDefaults(
        id: String,
        title: String?,
        body: String?,
        time: String?,
        sound: Bool?,
        vibration: Bool?,
        priority: String?,
        repeatDaily: Bool?,
        timezone: String?
    ) {
        var reminders = UserDefaults.standard.array(forKey: "daily_reminders") as? [[String: Any]] ?? []
        
        for i in 0..<reminders.count {
            if reminders[i]["id"] as? String == id {
                if let title = title { reminders[i]["title"] = title }
                if let body = body { reminders[i]["body"] = body }
                if let time = time { reminders[i]["time"] = time }
                if let sound = sound { reminders[i]["sound"] = sound }
                if let vibration = vibration { reminders[i]["vibration"] = vibration }
                if let priority = priority { reminders[i]["priority"] = priority }
                if let repeatDaily = repeatDaily { reminders[i]["repeatDaily"] = repeatDaily }
                if let timezone = timezone { reminders[i]["timezone"] = timezone }
                break
            }
        }
        
        UserDefaults.standard.set(reminders, forKey: "daily_reminders")
        print("DNP-REMINDER: Reminder updated: \(id)")
    }
}