update notification

lib/common/utils/fcm_service.dart

@@ -1,15 +1,54 @@
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:injectable/injectable.dart';
 
 /// Background message handler — must be a top-level function.
+/// Firebase must be initialized here for background isolate.
 @pragma('vm:entry-point')
 Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
+  await Firebase.initializeApp();
   debugPrint('[FCM] Background message: ${message.messageId}');
+  // Show local notification for data-only messages in background
+  await _showBackgroundNotification(message);
+}
+
+/// Standalone local notifications plugin for background isolate use.
+final _backgroundLocalNotifications = FlutterLocalNotificationsPlugin();
+
+Future<void> _showBackgroundNotification(RemoteMessage message) async {
+  const androidInit = AndroidInitializationSettings('@drawable/ic_notification');
+  await _backgroundLocalNotifications.initialize(
+    const InitializationSettings(android: androidInit),
+  );
+
+  final notification = message.notification;
+  // Only show manually for data-only messages (FCM auto-shows notification messages)
+  if (notification != null) return;
+
+  final title = message.data['title'] as String?;
+  final body = message.data['body'] as String?;
+  if (title == null && body == null) return;
+
+  await _backgroundLocalNotifications.show(
+    message.hashCode,
+    title,
+    body,
+    const NotificationDetails(
+      android: AndroidNotificationDetails(
+        'high_importance_channel',
+        'High Importance Notifications',
+        importance: Importance.high,
+        priority: Priority.high,
+        icon: '@drawable/ic_notification',
+      ),
+    ),
+    payload: jsonEncode(message.data),
+  );
 }
 
 @lazySingleton
@@ -23,7 +62,10 @@ class FcmService {
     'high_importance_channel',
     'High Importance Notifications',
     description: 'This channel is used for important notifications.',
-    importance: Importance.high,
+    importance: Importance.max, // max agar banner (heads-up) muncul
+    playSound: true,
+    enableVibration: true,
+    enableLights: true,
   );
 
   /// Call this once during app startup (after Firebase.initializeApp).
@@ -124,11 +166,19 @@ class FcmService {
           _androidChannel.id,
           _androidChannel.name,
           channelDescription: _androidChannel.description,
-          icon: '@mipmap/launcher_icon',
-          importance: Importance.high,
+          icon: '@drawable/ic_notification',
+          importance: Importance.max,
           priority: Priority.high,
+          playSound: true,
+          enableVibration: true,
+          // Heads-up notification (banner)
+          fullScreenIntent: false,
+        ),
+        iOS: const DarwinNotificationDetails(
+          presentAlert: true,
+          presentBadge: true,
+          presentSound: true,
         ),
-        iOS: const DarwinNotificationDetails(),
       ),
       payload: jsonEncode(message.data),
     );