Trying to do the notification for all users.

lib/services/notification_service.dart

@@ -1,8 +1,16 @@
 import 'dart:io';
+import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:firebase_core/firebase_core.dart';
 import 'package:travel_mate/services/logger_service.dart';
 
+@pragma('vm:entry-point')
+Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
+  await Firebase.initializeApp();
+  LoggerService.info('Handling a background message: ${message.messageId}');
+}
+
 class NotificationService {
   static final NotificationService _instance = NotificationService._internal();
   factory NotificationService() => _instance;
@@ -41,8 +49,24 @@ class NotificationService {
     // Handle foreground messages
     FirebaseMessaging.onMessage.listen(_handleForegroundMessage);
 
+    // Handle token refresh
+    FirebaseMessaging.instance.onTokenRefresh.listen(_onTokenRefresh);
+
     _isInitialized = true;
     LoggerService.info('NotificationService initialized');
+
+    // Print current token for debugging
+    final token = await getFCMToken();
+    LoggerService.info('Current FCM Token: $token');
+  }
+
+  Future<void> _onTokenRefresh(String newToken) async {
+    LoggerService.info('FCM Token refreshed: $newToken');
+    // We need the user ID to save the token.
+    // Since this service is a singleton, we might not have direct access to the user ID here
+    // without injecting the repository or bloc.
+    // For now, we rely on the AuthBloc to update the token on login/start.
+    // Ideally, we should save it here if we have the user ID.
   }
 
   Future<void> _requestPermissions() async {
@@ -85,6 +109,20 @@ class NotificationService {
     }
   }
 
+  Future<void> saveTokenToFirestore(String userId) async {
+    try {
+      final token = await getFCMToken();
+      if (token != null) {
+        await FirebaseFirestore.instance.collection('users').doc(userId).set({
+          'fcmToken': token,
+        }, SetOptions(merge: true));
+        LoggerService.info('FCM Token saved to Firestore for user: $userId');
+      }
+    } catch (e) {
+      LoggerService.error('Error saving FCM token to Firestore: $e');
+    }
+  }
+
   Future<void> _handleForegroundMessage(RemoteMessage message) async {
     LoggerService.info('Got a message whilst in the foreground!');
     LoggerService.info('Message data: ${message.data}');