Implement FCM [WIP]

flutter/lib/main.dart

@@ -1,13 +1,17 @@
+import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:fl_toast/fl_toast.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:hive_flutter/hive_flutter.dart';
+import 'package:simplecloudnotifier/api/api_client.dart';
 import 'package:simplecloudnotifier/nav_layout.dart';
 import 'package:simplecloudnotifier/state/app_theme.dart';
 import 'package:simplecloudnotifier/state/application_log.dart';
 import 'package:simplecloudnotifier/state/globals.dart';
 import 'package:simplecloudnotifier/state/request_log.dart';
 import 'package:simplecloudnotifier/state/user_account.dart';
+import 'package:firebase_core/firebase_core.dart';
+import 'firebase_options.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -35,6 +39,22 @@ void main() async {
     ApplicationLog.error('Failed to open Hive-Box: scn-logs: ' + exc.toString(), trace: trace);
   }
 
+  UserAccount(); // ensure UserAccount is loaded
+
+  await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
+
+  final notificationSettings = await FirebaseMessaging.instance.requestPermission(provisional: true);
+
+  FirebaseMessaging.instance.onTokenRefresh.listen((fcmToken) {
+    try {
+      setFirebaseToken(fcmToken);
+    } catch (exc, trace) {
+      ApplicationLog.error('Failed to set firebase token: ' + exc.toString(), trace: trace);
+    }
+  }).onError((dynamic err) {
+    ApplicationLog.error('Failed to listen to token refresh events: ' + (err?.toString() ?? ''));
+  });
+
   ApplicationLog.debug('Application started');
 
   runApp(
@@ -48,13 +68,25 @@ void main() async {
   );
 }
 
+void setFirebaseToken(String fcmToken) async {
+  ApplicationLog.info('New firebase token: $fcmToken');
+  final acc = UserAccount();
+  if (acc.auth != null) {
+    if (acc.client == null) {
+      final client = await APIClient.addClient(acc.auth, fcmToken, Globals().platform, Globals().version, Globals().clientType);
+      acc.setClient(client);
+    } else {
+      final client = await APIClient.updateClient(acc.auth, acc.client!.clientID, fcmToken, Globals().platform, Globals().version);
+      acc.setClient(client);
+    }
+  }
+}
+
 class SCNApp extends StatelessWidget {
   const SCNApp({super.key});
 
   @override
   Widget build(BuildContext context) {
-    Provider.of<UserAccount>(context); // ensure UserAccount is loaded (unneccessary if lazy: false is set in MultiProvider ??)
-
     return Consumer<AppTheme>(
       builder: (context, appTheme, child) => MaterialApp(
         title: 'SimpleCloudNotifier',