Use Websocket to update number of unread notifications

lib/helpers/events_helper.dart

@@ -9,6 +9,13 @@ import 'package:event_bus/event_bus.dart';
 /// Main WebSocket closed
 class WSClosedEvent {}
 
+/// New number of notifications
+class NewNumberNotifsEvent {
+  final int newNum;
+
+  NewNumberNotifsEvent(this.newNum);
+}
+
 class EventsHelper {
   static EventBus _mgr = EventBus();
 

lib/helpers/websocket_helper.dart

@@ -1,6 +1,9 @@
+import 'dart:convert';
+
 import 'package:comunic/helpers/events_helper.dart';
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/config.dart';
+import 'package:comunic/models/ws_message.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
 
 /// User web socket helper
@@ -40,7 +43,10 @@ class WebSocketHelper {
 
     _ws.stream.listen(
       // When we got data
-          (onData) => print("WS New data: $onData"),
+          (data) {
+        print("WS New data: $data");
+        _processMessage(data.toString());
+      },
 
       // Print errors on console
       onError: (e, stack) {
@@ -55,4 +61,31 @@ class WebSocketHelper {
       },
     );
   }
+
+  /// Process incoming message
+  static _processMessage(String msgStr) {
+    try {
+      final msg = WsMessage.fromJSON(jsonDecode(msgStr));
+
+      if (!msg.hasId)
+        _processUnattendedMessage(msg);
+      else
+        throw Exception("Do not know how to process attended message!");
+    } catch (e, stack) {
+      print("WS could not process message: $e");
+      print(stack);
+    }
+  }
+
+  /// Process an unattended message
+  static _processUnattendedMessage(WsMessage msg) {
+    switch (msg.title) {
+      case "number_notifs":
+        EventsHelper.emit(NewNumberNotifsEvent(msg.data));
+        break;
+
+      default:
+        throw Exception("Unknown message type: ${msg.title}");
+    }
+  }
 }