feat(video_calls): fixed online indicator and in app notifications for video call

lib/features/chat/presentation/bloc/chat_room_cubit/chat_room_cubit.dart

@@ -16,6 +16,7 @@ import 'package:eatvio_app/features/chat/models/plan_complain_model.dart';
 import 'package:eatvio_app/features/chat/presentation/bloc/chat_room_cubit/chat_room_state.dart';
 import 'package:eatvio_app/features/chat/presentation/bloc/chats_cubit/chats_cubit.dart';
 import 'package:eatvio_app/features/chat/repositories/chat_repository.dart';
+import 'package:eatvio_app/features/chat/utils/chat_counterpart_utils.dart';
 import 'package:eatvio_app/features/my_finance/models/card_model.dart';
 import 'package:eatvio_app/features/my_finance/repositories/cards_repository.dart';
 import 'package:eatvio_app/features/plans/models/chosen_plan_model.dart';
@@ -34,6 +35,8 @@ class ChatRoomCubit extends Cubit<ChatRoomState> {
   late int lastPage;
   bool isLoading = false;
   Timer? _timer;
+  String? _activeChatUuid;
+  void Function(bool isOnline)? _presenceOnlineListener;
   var uuid = const Uuid();
 
   ChatRoomCubit({required this.chatRepository, required this.wsManager, required this.cardsRepository}) : super(const ChatRoomState.loading());
@@ -170,8 +173,10 @@ class ChatRoomCubit extends Cubit<ChatRoomState> {
   Future<void> _subscribeToChatChannel({required String uuid, required String chatId}) async {
     final client = wsManager.client;
     if (client == null) return;
+    _activeChatUuid = uuid;
     await wsManager.initPrivateDirectChatChannel(chatId);
     wsManager.subscribeDirectChatChannel();
+    await _subscribeToPresenceChannel(chatId: chatId);
     messagesSubscription = wsManager.directChatStream?.listen((event) {
       AudioPlayer().play((AssetSource('audio/recive_message.wav')));
       final message = ChatMessageModel.fromJson(jsonDecode(event.data));
@@ -197,6 +202,118 @@ class ChatRoomCubit extends Cubit<ChatRoomState> {
     });
   }
 
+  Future<void> _subscribeToPresenceChannel({required String chatId}) async {
+    final currentState = state;
+    if (currentState is! ChatRoomStateLoaded) return;
+
+    final counterpart = resolveChatCounterpart(
+      users: currentState.chatRoom.users,
+      currentUserId: wsManager.userId,
+    );
+
+    await wsManager.initPresenceDirectChatChannel(chatId);
+    _presenceOnlineListener = (isOnline) {
+      unawaited(_handleCounterpartOnlineChanged(
+        counterpartField: counterpart.id == currentState.chatRoom.users.receiver.id
+            ? _ChatCounterpartField.receiver
+            : _ChatCounterpartField.sender,
+        isOnline: isOnline,
+      ));
+    };
+    wsManager.addPresenceDirectChatListener(
+      counterpartUserId: counterpart.id,
+      onCounterpartOnlineChanged: _presenceOnlineListener!,
+    );
+  }
+
+  Future<void> _handleCounterpartOnlineChanged({
+    required _ChatCounterpartField counterpartField,
+    required bool isOnline,
+  }) async {
+    final currentState = state;
+    if (currentState is! ChatRoomStateLoaded) return;
+
+    final counterpart = counterpartField == _ChatCounterpartField.receiver
+        ? currentState.chatRoom.users.receiver
+        : currentState.chatRoom.users.sender;
+
+    if (counterpart.isOnline == isOnline && (isOnline || counterpart.lastSeenText.isNotEmpty)) {
+      return;
+    }
+
+    if (!isOnline) {
+      await _refreshCounterpartOnlineStatus(counterpartField: counterpartField);
+      return;
+    }
+
+    _emitCounterpartOnlineStatus(
+      counterpartField: counterpartField,
+      isOnline: true,
+      lastSeenText: '',
+    );
+  }
+
+  Future<void> _refreshCounterpartOnlineStatus({
+    required _ChatCounterpartField counterpartField,
+  }) async {
+    final chatUuid = _activeChatUuid;
+    if (chatUuid == null) return;
+
+    try {
+      final chatRoom = await chatRepository.getChatRoom(chatUuid);
+      final currentState = state;
+      if (currentState is! ChatRoomStateLoaded) return;
+
+      final counterpart = resolveChatCounterpart(
+        users: chatRoom.users,
+        currentUserId: wsManager.userId,
+      );
+      final field = counterpart.id == currentState.chatRoom.users.receiver.id
+          ? _ChatCounterpartField.receiver
+          : _ChatCounterpartField.sender;
+
+      if (field != counterpartField) return;
+
+      _emitCounterpartOnlineStatus(
+        counterpartField: counterpartField,
+        isOnline: counterpart.isOnline,
+        lastSeenText: counterpart.lastSeenText,
+      );
+    } catch (e, st) {
+      await reportFrom(e, st, this);
+    }
+  }
+
+  void _emitCounterpartOnlineStatus({
+    required _ChatCounterpartField counterpartField,
+    required bool isOnline,
+    required String lastSeenText,
+  }) {
+    final currentState = state;
+    if (currentState is! ChatRoomStateLoaded) return;
+
+    final users = currentState.chatRoom.users;
+    final updatedUsers = counterpartField == _ChatCounterpartField.receiver
+        ? users.copyWith(
+            receiver: users.receiver.copyWith(
+              isOnline: isOnline,
+              lastSeenText: lastSeenText,
+            ),
+          )
+        : users.copyWith(
+            sender: users.sender.copyWith(
+              isOnline: isOnline,
+              lastSeenText: lastSeenText,
+            ),
+          );
+
+    emit(
+      currentState.copyWith(
+        chatRoom: currentState.chatRoom.copyWith(users: updatedUsers),
+      ),
+    );
+  }
+
   Future<bool> sendMessage({String? data, List<File>? files, required String userSlug}) async {
     try {
       final messageUuid = uuid.v4();
@@ -337,6 +454,10 @@ class ChatRoomCubit extends Cubit<ChatRoomState> {
 
   @override
   Future<void> close() async {
+    if (_presenceOnlineListener != null) {
+      wsManager.removePresenceDirectChatListener(_presenceOnlineListener!);
+      _presenceOnlineListener = null;
+    }
     wsManager.unsubscribeDirectChatChannel();
     _timer?.cancel();
     messagesSubscription?.cancel();
@@ -435,3 +556,5 @@ class ChatRoomCubit extends Cubit<ChatRoomState> {
     }
   }
 }
+
+enum _ChatCounterpartField { sender, receiver }