Push Notifications With Appwrite using FCM Provider

I will share code in Parts Due to limits & I am not able to create any subscriber & Getting errors

( import 'package:flutter/material.dart'; import 'package:firebase_core/firebase_core.dart'; import 'package:firebase_messaging/firebase_messaging.dart'; import 'package:appwrite/appwrite.dart'; import 'package:appwrite/models.dart';

void main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(); FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler); runApp(MyApp()); }

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async { await Firebase.initializeApp(); print("Handling a background message: ${message.messageId}"); }

class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); }

)

class _MyAppState extends State<MyApp> { late Client client; late Messaging messaging; String? userId;

@override void initState() { super.initState(); _initializeAppwrite(); _initializeFCM(); _subscribeToTopic('66cc43930014666fb982'); }

void _initializeAppwrite() { client = Client() ..setEndpoint('https://cloud.appwrite.io/v1') ..setProject('643588ac5b13906fc980'); messaging = Messaging(client); }

Future<void> _loginAnonymously() async { try { final account = Account(client); final response = await account.createAnonymousSession(); userId = response.$id; print('User ID: $userId'); } catch (e) { print('Error logging in anonymously: $e'); } }

Future<void> _initializeFCM() async { FirebaseMessaging messaging = FirebaseMessaging.instance;

// Request permission for iOS
NotificationSettings settings = await messaging.requestPermission(
  alert: true,
  badge: true,
  sound: true,
);

if (settings.authorizationStatus == AuthorizationStatus.authorized) {
  print('User granted permission');
} else if (settings.authorizationStatus == AuthorizationStatus.provisional) {
  print('User granted provisional permission');
} else {
  print('User declined or has not accepted permission');
}

// Get the token for this device
String? token = await messaging.getToken();
print("FCM Token: $token");

// Listen for messages
FirebaseMessaging.onMessage.listen((RemoteMessage message) {
  print('Received a message while in the foreground!');
  print('Message data: ${message.data}');

  if (message.notification != null) {
    print('Message also contained a notification: ${message.notification}');
  }
});

}

Future<void> _subscribeToTopic(String topicId) async { await _loginAnonymously();

if (userId != null) {
  try {
    await messaging.createSubscriber(
      topicId: topicId,
      subscriberId: userId!,
      targetId: 'your-target-id',
    );
    print('Subscribed to topic: $topicId');
  } catch (e) {
    print('Error subscribing to topic: $e');
  }
} else {
  print('Failed to obtain user ID');
}

}

@override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: Text('Appwrite Messaging with FCM'), ), body: Center( child: Text('Push Notifications Setup Complete'), ), ), ); } }