import 'dart:async';
import 'dart:convert';
import 'package:f_r_e_hub/app_state.dart';
import 'package:f_r_e_hub/backend/api_requests/api_calls.dart';
import 'package:flutter/material.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:rxdart/rxdart.dart';
import 'package:f_r_e_hub/components/templates_components/visit_request_template_component/visit_request_template_component_widget.dart';

class PushNotificationService {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging.instance;
  final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();
  final Subject<RemoteMessage> _onMessage = BehaviorSubject<RemoteMessage>();
  final BehaviorSubject<BuildContext> _context =
      BehaviorSubject<BuildContext>();

  PushNotificationService() {
    _initializeLocalNotifications(_context);
  }

  Future<void> initialize(BuildContext context) async {
    _context.add(context);
    await _requestPermissions();
    _listenToForegroundMessages(context);
    _listenToBackgroundMessages();
    _listenToNotificationClicks(context);
    await _updateDeviceToken();
  }

  Future<void> _requestPermissions() async {
    NotificationSettings settings = await _firebaseMessaging.requestPermission(
      alert: true,
      badge: true,
      sound: true,
    );
    if (settings.authorizationStatus == AuthorizationStatus.authorized) {
      debugPrint('User granted permission');
    } else {
      debugPrint('User declined or has not accepted permission');
    }
  }

  Map<String, dynamic> validJsonFromString(String? string) {
    // Switch(string != null || string.isNotEmpty) {
    //   case true:
    //     debugPrint()
    //     break;
    // }
    String stringValidate = string!
        .replaceAllMapped(RegExp(r'(\w+):'),
            (match) => '"${match[1]}":') // Enclose keys in double quotes
        .replaceAllMapped(RegExp(r':\s*(\w+)'), (match) => ': "${match[1]}"');
    Map<String, dynamic> json = jsonDecode(stringValidate);
    return json;
  }

  void _initializeLocalNotifications(
      BehaviorSubject<BuildContext> context) async {
    while (context.valueOrNull == null) {
      await Future.delayed(Duration(milliseconds: 100));
    }

    var initializationSettingsAndroid =
        AndroidInitializationSettings('mipmap/ic_fre_black');
    var initializationSettingsIOS = DarwinInitializationSettings(
      requestAlertPermission: true,
      requestBadgePermission: true,
      requestSoundPermission: true,
    );
    var initializationSettings = InitializationSettings(
      android: initializationSettingsAndroid,
      iOS: initializationSettingsIOS,
    );
    _flutterLocalNotificationsPlugin.initialize(
      initializationSettings,
      onDidReceiveNotificationResponse: (NotificationResponse response) async {
        debugPrint('Response payload:${response.payload}');
        if (response.payload != null) {
          // Preprocess the payload to ensure it's in a valid JSON format
          String validJsonPayload = response.payload!
              .replaceAllMapped(RegExp(r'(\w+):'),
                  (match) => '"${match[1]}":') // Enclose keys in double quotes
              .replaceAllMapped(
                  RegExp(r':\s*(\w+)'),
                  (match) =>
                      ': "${match[1]}"'); // Enclose string values in double quotes

          try {
            Map<String, dynamic> message = jsonDecode(validJsonPayload);
            debugPrint('Notification payload: $message');
            _handleNotificationClick(message);
          } catch (e) {
            debugPrint('Error decoding notification payload: $e');
          }
        }
      },
    );
    _createNotificationChannel();
  }

  void _createNotificationChannel() {
    _flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
            AndroidFlutterLocalNotificationsPlugin>()
        ?.createNotificationChannel(
          AndroidNotificationChannel(
            'channelID',
            'channelName',
            description: 'Channel Description',
            importance: Importance.max,
          ),
        );
  }

  void _listenToForegroundMessages(BuildContext context) {
    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      debugPrint('Got a message whilst in the foreground!');
      debugPrint('Message data: ${message.toMap()}');
      _onMessage.add(message);
      _showNotification(message);
    });
  }

  void _listenToBackgroundMessages() {
    FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
  }

  void _listenToNotificationClicks(BuildContext context) {
    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
      debugPrint('Notification clicked!');

      _onMessage.add(message);
      NotificationHandler().handleMessage(message.data, context);
    });
  }

  Future<void> _updateDeviceToken() async {
    final NotificationSettings settings =
        await _requestNotificationPermission();
    await _fetchAndLogApnsToken(settings);

    final String? deviceToken = await FirebaseMessaging.instance.getToken();
    if (deviceToken == null) {
      debugPrint('Failed to get Firebase Messaging token');
      return;
    }

    debugPrint('Push Messaging token: $deviceToken');
    FFAppState().token = deviceToken;

    final ApiCallResponse? updTokenResponse =
        await _updateTokenOnServer(deviceToken);
    if (_isTokenUpdateSuccessful(updTokenResponse)) {
      debugPrint('Token updated successfully');
    } else {
      debugPrint('Error updating token');
    }
  }

  Future<NotificationSettings> _requestNotificationPermission() async {
    final NotificationSettings settings =
        await _firebaseMessaging.requestPermission();
    if (settings.authorizationStatus == AuthorizationStatus.authorized) {
      debugPrint('User granted permission');
    } else {
      debugPrint('User declined or has not accepted permission');
    }
    return settings;
  }

  Future<void> _fetchAndLogApnsToken(NotificationSettings settings) async {
    if (settings.authorizationStatus == AuthorizationStatus.authorized) {
      final String? apnsToken = await _firebaseMessaging.getAPNSToken();
      if (apnsToken != null) {
        debugPrint('APNS Token: $apnsToken');
      } else {
        debugPrint('Failed to get APNS token');
      }
    }
  }

  Future<ApiCallResponse?> _updateTokenOnServer(String deviceToken) async {
    return await PhpGroup.updToken.call(
      token: deviceToken,
      devid: FFAppState().devUUID,
      useruuid: FFAppState().userUUID,
    );
  }

  bool _isTokenUpdateSuccessful(ApiCallResponse? response) {
    return PhpGroup.updToken.error((response?.jsonBody ?? '')) == false;
  }

  void _showNotification(RemoteMessage message) async {
    var androidDetails = AndroidNotificationDetails(
      'channelID',
      'channelName',
      channelDescription: 'Channel Description',
      importance: Importance.max,
      priority: Priority.high,
    );
    var iOSDetails = DarwinNotificationDetails();
    var generalNotificationDetails =
        NotificationDetails(android: androidDetails, iOS: iOSDetails);

    await _flutterLocalNotificationsPlugin.show(
      message.hashCode,
      message.notification?.title,
      message.notification?.body,
      generalNotificationDetails,
      payload: message.data.toString(),
    );
  }

  _handleNotificationClick(Map<String, dynamic> payload) {
    switch (payload.isNotEmpty) {
      case true:
        // Print the 'data' property
        debugPrint('Notification payload: $payload');
        // Handle the message data as needed
        NotificationHandler().handleMessage(payload, _context.value);
      // Access the 'data' property of 'RemoteMessage'
      case false:
        debugPrint('Notification payload is empty');
        // Handle the message notification as needed
        break;
    }
  }

  static Future<void> _firebaseMessagingBackgroundHandler(
      RemoteMessage message) async {
    debugPrint('Handling a background message: ${message.messageId}');
  }
}

class NotificationHandler {
  void handleMessage(Map<String, dynamic> message, BuildContext context) {
    debugPrint('Notification Received!');
    message.forEach((key, value) {
      debugPrint('$key: $value');
    });

    switch (message['type']) {
      case 'visit_request':
        _showVisitRequestDialog(message, context);
        break;
      case 'visit_response':
        debugPrint('visit_response');
        break;
      default:
        debugPrint('Notification type not recognized');
    }
  }

  void _showVisitRequestDialog(
      Map<String, dynamic> message, BuildContext context) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return Dialog(
          backgroundColor: Colors.transparent,
          child: VisitRequestTemplateComponentWidget(
            name: message['nome'] ?? 'Unknown',
            reason: message['motivo'] ?? 'Unknown',
            message: message['mensagem'] ?? 'Unknown',
            document: message['documento'] ?? 'Unknown',
          ),
        );
      },
    );
  }
}