align app with main repo

stream_chat_v1/lib/notifications_service.dart

@@ -1,9 +1,11 @@
+import 'dart:io';
+
+import 'package:flutter_apns/flutter_apns.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart'
     hide Message;
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
-void showLocalNotification(Event event) async {
-  if (event.message == null) return;
+void showLocalNotification(Message message, ChannelModel channel) async {
   final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
   final initializationSettingsAndroid =
       AndroidInitializationSettings('launch_background');
@@ -14,9 +16,9 @@ void showLocalNotification(Event event) async {
   );
   await flutterLocalNotificationsPlugin.initialize(initializationSettings);
   await flutterLocalNotificationsPlugin.show(
-    event.message.id.hashCode,
-    event.message.user.name,
-    event.message.text,
+    message.id.hashCode,
+    '${message.user.name} @ ${channel.name}',
+    message.text,
     NotificationDetails(
       android: AndroidNotificationDetails(
         'message channel',
@@ -29,3 +31,33 @@ void showLocalNotification(Event event) async {
     ),
   );
 }
+
+Future backgroundHandler(Map<String, dynamic> notification) async {
+  print('new notification ${notification}');
+  final messageId = notification['data']['id'];
+
+  final notificationData =
+      await NotificationService.getAndStoreMessage(messageId);
+
+  showLocalNotification(
+    notificationData.message,
+    notificationData.channel,
+  );
+}
+
+void initNotifications(Client client) {
+  final connector = createPushConnector();
+  connector.configure(
+    onBackgroundMessage: backgroundHandler,
+  );
+
+  connector.requestNotificationPermissions();
+  connector.token.addListener(() {
+    if (connector.token.value != null) {
+      client.addDevice(
+        connector.token.value,
+        Platform.isAndroid ? PushProvider.firebase : PushProvider.apn,
+      );
+    }
+  });
+}