Introduce api types and some changes.

lib/api/move.dart

@@ -0,0 +1,32 @@
+class ApiMove {
+  final ApiCoordinate startSquare;
+  final ApiCoordinate endSquare;
+
+  const ApiMove({
+    required this.startSquare,
+    required this.endSquare,
+  });
+
+  factory ApiMove.fromJson(Map<String, dynamic> json) {
+    final startSquare = ApiCoordinate.fromJson(json['startSquare']);
+    final endSquare = ApiCoordinate.fromJson(json['endSquare']);
+
+    return ApiMove(startSquare: startSquare, endSquare: endSquare);
+  }
+
+  Map<String, dynamic> toJson() =>
+      {'startSquare': startSquare, 'endSquare': endSquare};
+}
+
+class ApiCoordinate {
+  final int col;
+  final int row;
+
+  const ApiCoordinate({required this.col, required this.row});
+
+  factory ApiCoordinate.fromJson(Map<String, dynamic> json) {
+    return ApiCoordinate(col: json['col'], row: json['row']);
+  }
+
+  Map<String, dynamic> toJson() => {'col': col, 'row': row};
+}

lib/api/register.dart

@@ -0,0 +1,30 @@
+import 'package:uuid/uuid.dart';
+
+class ResponseFromRegisteringGame {
+  final UuidValue playerID;
+  final UuidValue lobbyID;
+
+  const ResponseFromRegisteringGame({
+    required this.playerID,
+    required this.lobbyID,
+  });
+
+  factory ResponseFromRegisteringGame.fromJson(Map<String, dynamic> json) {
+    final playerid = UuidValue(json['playerID']);
+    final lobbyid = UuidValue(json['lobbyID']);
+
+    return ResponseFromRegisteringGame(playerID: playerid, lobbyID: lobbyid);
+  }
+}
+
+class WebsocketMessageIdentifyPlayer {
+  final String playerID;
+  final String lobbyID;
+
+  const WebsocketMessageIdentifyPlayer({
+    required this.playerID,
+    required this.lobbyID,
+  });
+
+  Map<String, dynamic> toJson() => {'lobbyID': lobbyID, 'playerID': playerID};
+}

lib/chess_bloc/chess_bloc.dart

@@ -1,4 +1,7 @@
+import 'dart:convert';
+
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:mchess/api/move.dart';
 import 'package:mchess/chess_bloc/chess_events.dart';
 import 'package:mchess/chess_bloc/chess_position.dart';
 import 'package:mchess/connection/ws_connection.dart';
@@ -62,8 +65,13 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
   void ownMoveHandler(OwnPieceMoved event, Emitter<ChessBoardState> emit) {
     ChessPosition.getInstance().recordMove(event.startSquare, event.endSquare);
 
-    ServerConnection.getInstance().send(
-        'mv ${event.startSquare.toString()} ${event.endSquare.toString()}');
+    var start = ApiCoordinate(
+        col: event.startSquare.column, row: event.startSquare.row);
+    var end =
+        ApiCoordinate(col: event.endSquare.column, row: event.endSquare.row);
+    var move = ApiMove(startSquare: start, endSquare: end);
+
+    ServerConnection.getInstance().send(jsonEncode(move));
   }
 }
 

lib/chess_bloc/chess_position.dart

@@ -64,7 +64,10 @@ class ChessPosition {
   }
 
   ChessPositionType get currentPosition => position;
-  ChessMove get lastMove => history.last;
+  ChessMove? get lastMove {
+    if (history.isEmpty) return null;
+    return history.last;
+  }
 
   void recordMove(ChessCoordinate from, ChessCoordinate to) {
     position[to] = position[from] ?? const ChessPiece.none();

lib/connection/ws_connection.dart

@@ -1,8 +1,11 @@
+import 'dart:convert';
 import 'dart:developer';
 import 'package:flutter/foundation.dart';
+import 'package:mchess/api/move.dart';
 import 'package:mchess/chess_bloc/chess_bloc.dart';
 import 'package:mchess/chess_bloc/chess_events.dart';
 import 'package:mchess/chess_bloc/chess_position.dart';
+import 'package:mchess/api/register.dart';
 import 'package:mchess/utils/chess_utils.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
 
@@ -31,7 +34,7 @@ class ServerConnection {
     counter++;
   }
 
-  void connect(String playerID) {
+  void connect(String playerID, lobbyID) {
     if (wasConnected) channel.sink.close();
 
     if (kDebugMode) {
@@ -41,7 +44,8 @@ class ServerConnection {
       channel =
           WebSocketChannel.connect(Uri.parse('wss://chess.sw-gross.de:8080'));
     }
-    send(playerID);
+    send(jsonEncode(WebsocketMessageIdentifyPlayer(
+        playerID: (playerID), lobbyID: (lobbyID))));
 
     log(channel.closeCode.toString());
 
@@ -49,39 +53,27 @@ class ServerConnection {
 
     broadcast = channel.stream.asBroadcastStream();
 
-    broadcast.listen((data) {
+    broadcast.listen(handleIncomingData);
+  }
+
+  void handleIncomingData(dynamic data) {
     log("Data received:");
     log(data);
+    var apiMove = ApiMove.fromJson(jsonDecode(data));
 
-      var receivedString = data.toString();
-      var splitString = receivedString.split(' ');
+//Todo: Implement status messages
+// e.g. to tell the client that both players connected, who is playing which color and so on
 
-      if (splitString[0] == "cl") {
-        ChessColor onBottom =
-            splitString[1] == "white" ? ChessColor.white : ChessColor.black;
-        ChessBloc.getInstance().add(ColorDetermined(myColor: onBottom));
-        return;
-      }
-
-      if (splitString[0] == "bd") {
-        if (splitString[1] == "init") ChessBloc.getInstance().add(InitBoard());
-      }
-
-      if (splitString[0] == ('mv')) {
-        var startSquare = ChessCoordinate.fromString(splitString[1]);
-        var endSquare = ChessCoordinate.fromString(splitString[2]);
-        if (ChessMove(from: startSquare, to: endSquare) ==
-            ChessPosition.getInstance().lastMove) {
+    var move = ChessMove.fromApiMove(apiMove);
+    if (move == ChessPosition.getInstance().lastMove) {
       //This is our own move that got resent by the server. Do not process.
     } else {
-          log('lastMove: from: ${ChessPosition.getInstance().lastMove.from} to: ${ChessPosition.getInstance().lastMove.to}');
-          log('constructed move: from: $startSquare to: $endSquare)}');
-          log('Move received : ${startSquare.toAlphabetical()}:${endSquare.toAlphabetical()}');
+      log('lastMove: from: ${ChessPosition.getInstance().lastMove?.from} to: ${ChessPosition.getInstance().lastMove?.to}');
+      log('constructed move: from: ${move.from} to: ${move.to}');
+      log('Move received : ${move.from.toAlphabetical()}->${move.to.toAlphabetical()}');
 
-          ChessBloc.getInstance().add(OpponentPieceMoved(
-              startSquare: startSquare, endSquare: endSquare));
+      ChessBloc.getInstance()
+          .add(OpponentPieceMoved(startSquare: move.from, endSquare: move.to));
     }
   }
-    });
-  }
 }

lib/connection_cubit/connection_cubit.dart

@@ -15,8 +15,8 @@ class ConnectionCubit extends Cubit<ConnectionCubitState> {
     return _instance;
   }
 
-  void connect(String playerID) {
-    ServerConnection.getInstance().connect(playerID);
+  void connect(String playerID, lobbyID) {
+    ServerConnection.getInstance().connect(playerID, lobbyID);
     emit(ConnectionCubitState(true));
   }
 }

lib/models/models.dart

@@ -1,17 +0,0 @@
-import 'package:uuid/uuid.dart';
-
-class ResponseFromRegisteringGame {
-  final UuidValue playerID;
-
-  const ResponseFromRegisteringGame({
-    required this.playerID,
-  });
-
-  factory ResponseFromRegisteringGame.fromJson(Map<String, dynamic> json) {
-    final uuid = UuidValue(json['playerID']);
-
-    return ResponseFromRegisteringGame(
-      playerID: uuid,
-    );
-  }
-}

lib/pages/chess_game.dart

@@ -14,7 +14,8 @@ import 'package:uuid/uuid.dart';
 
 class ChessGame extends StatefulWidget {
   final UuidValue playerID;
-  const ChessGame({required this.playerID, super.key});
+  final UuidValue lobbyID;
+  const ChessGame({required this.playerID, required this.lobbyID, super.key});
 
   @override
   State<ChessGame> createState() => _ChessGameState();
@@ -24,7 +25,8 @@ class _ChessGameState extends State<ChessGame> {
   @override
   void initState() {
     super.initState();
-    ConnectionCubit.getInstance().connect(widget.playerID.uuid);
+    ConnectionCubit.getInstance()
+        .connect(widget.playerID.uuid, widget.lobbyID.uuid);
   }
 
   @override

lib/pages/prepare_chess_game.dart

@@ -1,7 +1,7 @@
 import 'dart:developer';
 
 import 'package:flutter/material.dart';
-import 'package:mchess/models/models.dart';
+import 'package:mchess/api/register.dart';
 import 'package:mchess/pages/chess_game.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
@@ -18,6 +18,7 @@ class PrepareChessGameWidget extends StatelessWidget {
           log('future done ${snapshot.data?.playerID}');
           return ChessGame(
             playerID: snapshot.data!.playerID,
+            lobbyID: snapshot.data!.lobbyID,
           );
         }
         return const CircularProgressIndicator();
@@ -26,8 +27,9 @@ class PrepareChessGameWidget extends StatelessWidget {
   }
 
   Future<ResponseFromRegisteringGame> registerForRandomGame() async {
-    final response =
-        await http.get(Uri.parse('http://localhost:8080/api/random'));
+    final response = await http.get(
+        Uri.parse('http://localhost:8080/api/random'),
+        headers: {"Accept": "application/json"});
 
     if (response.statusCode == 200) {
       log(response.body);
@@ -35,7 +37,7 @@ class PrepareChessGameWidget extends StatelessWidget {
     } else {
       // If the server did not return a 200 OK response,
       // then throw an exception.
-      throw Exception('Failed to load album');
+      throw Exception('Failed to register for random game');
     }
   }
 }

lib/utils/chess_utils.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/svg.dart';
+import 'package:mchess/api/move.dart';
 import 'package:quiver/core.dart';
 
 enum ChessPieceName {
@@ -65,6 +66,10 @@ class ChessCoordinate {
     return ChessCoordinate(column, row);
   }
 
+  factory ChessCoordinate.fromApiCoordinate(ApiCoordinate apiCoordinate) {
+    return ChessCoordinate(apiCoordinate.col, apiCoordinate.row);
+  }
+
   ChessCoordinate.copyFrom(ChessCoordinate original)
       : column = original.column,
         row = original.row;
@@ -159,6 +164,13 @@ class ChessMove {
 
   ChessMove({required this.from, required this.to});
 
+  factory ChessMove.fromApiMove(ApiMove apiMove) {
+    final start = ChessCoordinate.fromApiCoordinate(apiMove.startSquare);
+    final end = ChessCoordinate.fromApiCoordinate(apiMove.endSquare);
+
+    return ChessMove(from: start, to: end);
+  }
+
   @override
   operator ==(other) {
     return other is ChessMove && other.from == from && other.to == to;