//
//  PushNotificationHandler.swift
//  UltimateMyXL
//
//  Created by Armadiaz on 16/09/20.
//  Copyright © 2020 Aleph. All rights reserved.
//

import Firebase
import UIKit
import XLAlbums

class PushNotificationHandler: NSObject, MessagingDelegate, UNUserNotificationCenterDelegate {
    static let shared = PushNotificationHandler()

    override init() {
        super.init()
    }

    // REGISTER PUSH NOTIFICATION
    func registerForPushNotifications() {
        if #available(iOS 10.0, *) {
            // For iOS 10 display notification (sent via APNS)
            UNUserNotificationCenter.current().delegate = self
            let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
            UNUserNotificationCenter.current().requestAuthorization(
                options: authOptions,
                completionHandler: { _, _ in })
            // For iOS 10 data message (sent via FCM)
            Messaging.messaging().delegate = self
        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            UIApplication.shared.registerUserNotificationSettings(settings)
        }
        UIApplication.shared.registerForRemoteNotifications()
    }

    // RECEIVE TOKEN
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
        Dispatch.main {
            // Send notification token to middleware
            Preference.set(value: fcmToken, forKey: .kPushNotificationToken)
            if CoreDataUtils.fetchAllUsers().count > 0 {
                SessionRepo().sendNotificationTokenToMW(token: fcmToken) { (response, error) in
                    if let res = response {
                        dprint(res)
                    } else if let err = error {
                        dprint(err)
                    }
                }
            }
        }
    }

    // SHOW NOTIFICATION BANNER WHEN APP IS IN FOREGROUND
    func userNotificationCenter(
        _ center: UNUserNotificationCenter,
        willPresent notification: UNNotification,
        withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        let userInfo = notification.request.content.userInfo
        print(userInfo)
        // PRESENT NOTIFICATION BANNER
        completionHandler([[.alert, .sound]])
    }

    // TRIGGERED WHEN USER PRESS THE NOTIFICATION BANNER
    func userNotificationCenter(
        _ center: UNUserNotificationCenter,
        didReceive response: UNNotificationResponse,
        withCompletionHandler completionHandler: @escaping () -> Void) {
        // return if there's no user
        Dispatch.main {
            guard CoreDataUtils.fetchAllUsers().count > 0 else {
                completionHandler()
                return
            }

            // Get notification "data" payload sent from FCM
            var userInfo = response.notification.request.content.userInfo

            if let moengageInfo = userInfo["app_extra"] as? [AnyHashable: Any], let screenInfo = moengageInfo["screenData"] as? [AnyHashable: Any] {
                userInfo = screenInfo
            }

            var notificationPayload: NotificationPayloadModel
            // Converting notification payload data (Dictionary) as NotificationPayloadModel (Struct)
            if let formId = userInfo["surveyId"] as? String, !formId.isEmpty {
                notificationPayload = NotificationPayloadModel(actionType: "SURVEY", actionParam: formId)
            } else {
                notificationPayload = NotificationPayloadModel(dictionary: userInfo)
            }

            // check for correct user if it exist based on user subs ID
            if let notificationSubID = notificationPayload.subscriptionId, !notificationSubID.isEmpty, let targetUserBySubsID = CoreDataUtils.fetchUser(with: notificationSubID) {
                // Try to switch user based on User SubscriberID
                if targetUserBySubsID.subscriberID != CoreDataUtils.getActiveUser()?.subscriberID {
                    CoreDataUtils.setUserAsActive(user: targetUserBySubsID)
                    Preference.set(value: targetUserBySubsID.isCorporate, forKey: .kIsEnterprise)
                }
                // check for correct user if it exist based on user MSISDN
            } else if let notificationMSISDN = notificationPayload.msisdn, !notificationMSISDN.isEmpty, let targetUserByMSISDN = CoreDataUtils.fetchUserWithMSISDN(msisdn: notificationPayload.msisdn ?? "") {
                // Try to switch user based on User MSISDN
                if targetUserByMSISDN.profile?.msisdn != CoreDataUtils.getActiveUser()?.profile?.msisdn {
                    CoreDataUtils.setUserAsActive(user: targetUserByMSISDN)
                    Preference.set(value: targetUserByMSISDN.isCorporate, forKey: .kIsEnterprise)
                }
            }

            self._processDeeplink(notificationPayload: notificationPayload)
            completionHandler()
        }
    }

    func _processDeeplink(notificationPayload: NotificationPayloadModel) {
        let dynamicLinkData = DynamicLinkModel(param: [notificationPayload.actionType ?? "": notificationPayload.actionParam ?? ""])
        Preference.setStruct(dynamicLinkData, forKey: .kDynamicLinkData)
        self._processPushNotification()
    }

    private func _processPushNotification() {
        if let tabBarController = UIApplication.shared.windows.first?.rootViewController as? XLTabBarController {
            // Handle the notification when the app is in foreground but not on Dashboard
            if tabBarController.selectedIndex != 0 {
                AppDelegate.shared.setTabbarAsRoot(transition: .init(direction: .fade))
            } else if let navController = tabBarController.viewControllers?.first as? XLNavigationController {
                if let viewController = navController.viewControllers.first as? DashboardViewController {
                    viewController.presenter.handleDynamicLink()
                } else if let viewController = navController.viewControllers.first as? DashboardHomePostpaidViewController {
                    viewController.presenter.handleDynamicLink()
                }
            }
        }
    }
}