Initial web socket client support

shared_models/lib/room.dart

@@ -23,3 +23,51 @@ class CreateRoomResponse {
 
   Map<String, dynamic> toJson() => _$CreateRoomResponseToJson(this);
 }
+
+sealed class GameRoomMessage {
+  const GameRoomMessage();
+
+  factory GameRoomMessage.fromJson(Map<String, dynamic> json) {
+    return switch (json['type']) {
+      'ping' => PingMessage.fromJson(json),
+      'playerVote' => PlayerVoteMessage.fromJson(json),
+      _ => throw Exception('Unknown message type'),
+    };
+  }
+
+  Map<String, dynamic> toJson();
+}
+
+class PingMessage extends GameRoomMessage {
+  final DateTime timestamp;
+
+  const PingMessage({required this.timestamp});
+
+  factory PingMessage.fromJson(Map<String, dynamic> json) =>
+      PingMessage(timestamp: DateTime.parse(json['timestamp'] as String));
+
+  @override
+  Map<String, dynamic> toJson() => {
+        'type': 'ping',
+        'timestamp': timestamp.toIso8601String(),
+      };
+}
+
+class PlayerVoteMessage extends GameRoomMessage {
+  final String playerUuid;
+  final int vote;
+
+  const PlayerVoteMessage({required this.playerUuid, required this.vote});
+
+  factory PlayerVoteMessage.fromJson(Map<String, dynamic> json) => PlayerVoteMessage(
+        playerUuid: json['playerUuid'] as String,
+        vote: json['vote'] as int,
+      );
+
+  @override
+  Map<String, dynamic> toJson() => {
+        'type': 'playerVote',
+        'playerUuid': playerUuid,
+        'vote': vote,
+      };
+}