Add platform checks and add auto refresh with rate limiting

lib/main.dart

@@ -1,4 +1,5 @@
 import 'dart:developer';
+import 'dart:io' show Platform;
 
 import 'package:contacts_plus_plus/clients/neos_hub.dart';
 import 'package:contacts_plus_plus/clients/settings_client.dart';
@@ -12,12 +13,15 @@ import 'clients/api_client.dart';
 import 'models/authentication_data.dart';
 
 void main() async {
-  await Workmanager().initialize(
-      callbackDispatcher, // The top level function, aka callbackDispatcher
-      isInDebugMode: true // If enabled it will post a notification whenever the task is running. Handy for debugging tasks
-  );
-  Logger.root.onRecord.listen((event) => log(event.message, name: event.loggerName));
   WidgetsFlutterBinding.ensureInitialized();
+  if (Platform.isAndroid) {
+    await Workmanager().initialize(
+        callbackDispatcher, // The top level function, aka callbackDispatcher
+        isInDebugMode: true // If enabled it will post a notification whenever the task is running. Handy for debugging tasks
+    );
+  }
+
+  Logger.root.onRecord.listen((event) => log(event.message, name: event.loggerName));
   final settingsClient = SettingsClient();
   await settingsClient.loadSettings();
   runApp(Phoenix(child: ContactsPlusPlus(settingsClient: settingsClient,)));

lib/widgets/friends_list.dart

@@ -19,15 +19,19 @@ class FriendsList extends StatefulWidget {
 }
 
 class _FriendsListState extends State<FriendsList> {
+  static const Duration _autoRefreshDuration = Duration(seconds: 90);
+  static const Duration _refreshTimeoutDuration = Duration(seconds: 30);
+  final _unreads = <String, List<Message>>{};
   Future<List<Friend>>? _friendsFuture;
   ClientHolder? _clientHolder;
-  Timer? _debouncer;
+  Timer? _autoRefresh;
+  Timer? _refreshTimeout;
   String _searchFilter = "";
-  final _unreads = <String, List<Message>>{};
 
   @override
   void dispose() {
-    _debouncer?.cancel();
+    _autoRefresh?.cancel();
+    _refreshTimeout?.cancel();
     super.dispose();
   }
 
@@ -42,6 +46,7 @@ class _FriendsListState extends State<FriendsList> {
   }
 
   void _refreshFriendsList() {
+    if (_refreshTimeout?.isActive == true) return;
     _friendsFuture = FriendApi.getFriendsList(_clientHolder!.apiClient).then((Iterable<Friend> value) async {
       final unreadMessages = await MessageApi.getUserMessages(_clientHolder!.apiClient, unreadOnly: true);
       _unreads.clear();
@@ -66,6 +71,10 @@ class _FriendsListState extends State<FriendsList> {
           aVal += a.userStatus.onlineStatus.compareTo(b.userStatus.onlineStatus) * 2;
           return aVal.compareTo(bVal);
         });
+      _autoRefresh?.cancel();
+      _autoRefresh = Timer(_autoRefreshDuration, () => setState(() => _refreshFriendsList()));
+      _refreshTimeout?.cancel();
+      _refreshTimeout = Timer(_refreshTimeoutDuration, () {});
       return friends;
     });
   }
@@ -147,7 +156,6 @@ class _FriendsListState extends State<FriendsList> {
                 });
               },
               onExpansionChanged: (expanded) {
-                if (_debouncer?.isActive ?? false) _debouncer?.cancel();
                 if (!expanded) {
                   setState(() {
                     _searchFilter = "";

lib/widgets/login_screen.dart

@@ -104,7 +104,7 @@ class _LoginScreenState extends State<LoginScreen> {
                     final requestResult = await notificationManager.resolvePlatformSpecificImplementation<
                         AndroidFlutterLocalNotificationsPlugin>()
                         ?.requestPermission();
-                    await settingsClient.changeSettings(settingsClient.currentSettings.copyWith(notificationsDenied: requestResult == null ? null : !requestResult));
+                    await settingsClient.changeSettings(settingsClient.currentSettings.copyWith(notificationsDenied: requestResult == null ? false : !requestResult));
                   },
                   child: const Text("Yes"),
                 )

lib/widgets/message_audio_player.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:io' show Platform;
 
 import 'package:contacts_plus_plus/clients/api_client.dart';
 import 'package:contacts_plus_plus/auxiliary.dart';
@@ -25,13 +26,32 @@ class _MessageAudioPlayerState extends State<MessageAudioPlayer> {
   @override
   void initState() {
     super.initState();
-    _audioPlayer.setAudioSource(AudioSource.uri(Uri.parse(
+    if (Platform.isAndroid) {
+      _audioPlayer.setAudioSource(AudioSource.uri(Uri.parse(
         Aux.neosDbToHttp(AudioClipContent.fromMap(jsonDecode(widget.message.content)).assetUri)
     ))).whenComplete(() => _audioPlayer.setLoopMode(LoopMode.off));
+    }
   }
 
   @override
   Widget build(BuildContext context) {
+    if (!Platform.isAndroid) {
+      return Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.center,
+          children: [
+            Icon(Icons.error_outline, color: Theme.of(context).colorScheme.error,),
+            const SizedBox(height: 4,),
+            Text("Sorry, audio-messages are not\n supported on this platform.", textAlign: TextAlign.center,
+              softWrap: true,
+              maxLines: 3,
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(color: Theme.of(context).colorScheme.error),
+            ),
+          ],
+        ),
+      );
+    }
     return IntrinsicWidth(
       child: StreamBuilder<PlayerState>(
         stream: _audioPlayer.playerStateStream,

lib/widgets/messages_list.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:contacts_plus_plus/clients/api_client.dart';
 import 'package:contacts_plus_plus/auxiliary.dart';