twilio-wp-plugin/mobile/lib/services/push_notification_service.dart

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'api_client.dart';

@pragma('vm:entry-point')
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  // VoIP pushes are handled natively by twilio_voice plugin.
  // Other data messages can show a local notification if needed.
}

class PushNotificationService {
  final ApiClient _api;
  final FirebaseMessaging _messaging = FirebaseMessaging.instance;
  final FlutterLocalNotificationsPlugin _localNotifications =
      FlutterLocalNotificationsPlugin();

  PushNotificationService(this._api);

  Future<void> initialize() async {
    FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

    await _messaging.requestPermission(
      alert: true,
      badge: true,
      sound: true,
      criticalAlert: true,
    );

    // Initialize local notifications
    const androidSettings =
        AndroidInitializationSettings('@mipmap/ic_launcher');
    const initSettings = InitializationSettings(android: androidSettings);
    await _localNotifications.initialize(initSettings);

    // Get and register FCM token
    final token = await _messaging.getToken();
    if (token != null) {
      await _registerToken(token);
    }

    // Listen for token refresh
    _messaging.onTokenRefresh.listen(_registerToken);

    // Handle foreground messages (non-VoIP)
    FirebaseMessaging.onMessage.listen(_handleForegroundMessage);
  }

  Future<void> _registerToken(String token) async {
    try {
      await _api.dio.post('/fcm/register', data: {'fcm_token': token});
    } catch (_) {}
  }

  void _handleForegroundMessage(RemoteMessage message) {
    final data = message.data;
    final type = data['type'];

    // VoIP incoming_call is handled by twilio_voice natively
    if (type == 'incoming_call') return;

    // Show local notification for other types (missed call, queue alert, etc.)
    _localNotifications.show(
      message.hashCode,
      data['title'] ?? 'TWP Softphone',
      data['body'] ?? '',
      const NotificationDetails(
        android: AndroidNotificationDetails(
          'twp_general',
          'General Notifications',
          importance: Importance.high,
          priority: Priority.high,
        ),
      ),
    );
  }
}