//
//  AppDelegate.swift
//  SportsTime
//
//  Handles push notification registration and CloudKit subscription notifications
//

import UIKit
import CloudKit
import UserNotifications

class AppDelegate: NSObject, UIApplicationDelegate {

    func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
    ) -> Bool {
        // Register for remote notifications (required for CloudKit subscriptions)
        application.registerForRemoteNotifications()
        return true
    }

    func application(
        _ application: UIApplication,
        didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data
    ) {
        #if DEBUG
        print("📡 [Push] Registered for remote notifications")
        #endif
    }

    func application(
        _ application: UIApplication,
        didFailToRegisterForRemoteNotificationsWithError error: Error
    ) {
        #if DEBUG
        print("📡 [Push] Failed to register: \(error.localizedDescription)")
        #endif
    }

    func application(
        _ application: UIApplication,
        didReceiveRemoteNotification userInfo: [AnyHashable: Any],
        fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void
    ) {
        // Ensure completionHandler fires exactly once, even if sync hangs
        var hasCompleted = false
        let complete: (UIBackgroundFetchResult) -> Void = { result in
            guard !hasCompleted else { return }
            hasCompleted = true
            completionHandler(result)
        }

        // Timeout: iOS kills background fetches after ~30s, so fire at 25s as safety net
        DispatchQueue.main.asyncAfter(deadline: .now() + 25) {
            complete(.failed)
        }

        guard let notification = CKNotification(fromRemoteNotificationDictionary: userInfo) as? CKQueryNotification,
              let subscriptionID = notification.subscriptionID,
              CloudKitService.canonicalSubscriptionIDs.contains(subscriptionID),
              let recordType = CloudKitService.recordType(forSubscriptionID: subscriptionID) else {
            complete(.noData)
            return
        }

        Task { @MainActor in
            var changed = false

            if notification.queryNotificationReason == .recordDeleted,
               let recordID = notification.recordID {
                changed = await BackgroundSyncManager.shared.applyDeletionHint(
                    recordType: recordType,
                    recordName: recordID.recordName
                )
            }

            let updated = await BackgroundSyncManager.shared.triggerSyncFromPushNotification(subscriptionID: subscriptionID)
            complete((changed || updated) ? .newData : .noData)
        }
    }
}