Fix the current position in ChessPositionManager, now that we rely on position instead of detecting en passant ourselves.

lib/chess_bloc/chess_bloc.dart

@@ -20,8 +20,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
   ChessBloc._internal() : super(ChessBoardState.init()) {
     on<InitBoard>(initBoard);
     on<ColorDetermined>(flipBoard);
-    on<ReceivedMove>(moveHandler);
-    on<ReceivedPosition>(positionHandler);
+    on<ReceivedMove>(moveAndPositionHandler);
     on<OwnPieceMoved>(ownMoveHandler);
     on<OwnPromotionPlayed>(ownPromotionHandler);
     on<InvalidMovePlayed>(invalidMoveHandler);
@@ -37,9 +36,9 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
 
   void initBoard(InitBoard event, Emitter<ChessBoardState> emit) {
     turnColor = ChessColor.white;
-    ChessPosition.getInstance().resetToStartingPosition();
+    ChessPositionManager.getInstance().resetToStartingPosition();
     emit(ChessBoardState(ChessColor.white, ChessColor.white,
-        ChessPosition.getInstance().currentPosition));
+        ChessPositionManager.getInstance().currentPosition));
   }
 
   void flipBoard(ColorDetermined event, Emitter<ChessBoardState> emit) {
@@ -49,13 +48,13 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
   }
 
   void moveHandler(ReceivedMove event, Emitter<ChessBoardState> emit) {
-    ChessPosition.getInstance().recordMove(event.startSquare, event.endSquare);
   }
 
-  void positionHandler(
-    ReceivedPosition event,
+  void moveAndPositionHandler(
+    ReceivedMove event,
     Emitter<ChessBoardState> emit,
   ) {
+    ChessPositionManager.getInstance().recordMove(event.startSquare, event.endSquare, event.position);
     turnColor = state.newTurnColor == ChessColor.white
         ? ChessColor.black
         : ChessColor.white;
@@ -79,7 +78,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
 
     //Temporary chess position until server responds with acknowledgement
     var move = ChessMove.fromApiMove(apiMove);
-    var tempPosition = ChessPosition.getInstance().copyOfCurrentPosition;
+    var tempPosition = ChessPositionManager.getInstance().copyOfCurrentPosition;
     tempPosition[move.to] = tempPosition[move.from] ?? const ChessPiece.none();
     tempPosition[move.from] = const ChessPiece.none();
 
@@ -115,7 +114,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
       ChessBoardState(
         state.bottomColor,
         turnColor,
-        ChessPosition.getInstance().currentPosition,
+        ChessPositionManager.getInstance().currentPosition,
       ),
     );
   }
@@ -124,7 +123,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
 class ChessBoardState {
   late ChessColor bottomColor;
   final ChessColor newTurnColor;
-  final Map<ChessCoordinate, ChessPiece> position;
+  final ChessPosition position;
 
   ChessBoardState._(this.bottomColor, this.newTurnColor, this.position);
 
@@ -140,10 +139,10 @@ class ChessBoardState {
     ChessColor bottomColor = ChessColor.white;
     ChessColor turnColor = ChessColor.white;
 
-    ChessPosition.getInstance().resetToStartingPosition();
+    ChessPositionManager.getInstance().resetToStartingPosition();
 
     return ChessBoardState(
-        bottomColor, turnColor, ChessPosition.getInstance().currentPosition);
+        bottomColor, turnColor, ChessPositionManager.getInstance().currentPosition);
   }
 
   void logPosition(Map<ChessCoordinate, ChessPiece> pos) {

lib/chess_bloc/chess_events.dart

@@ -4,16 +4,11 @@ import 'package:mchess/utils/chess_utils.dart';
 abstract class ChessEvent {}
 
 class ReceivedMove extends ChessEvent {
-  final ChessCoordinate startSquare;
-  final ChessCoordinate endSquare;
+    final ChessCoordinate startSquare;
+    final ChessCoordinate endSquare;
+    final ChessPosition position;
 
-  ReceivedMove({required this.startSquare, required this.endSquare});
-}
-
-class ReceivedPosition extends ChessEvent {
-    final ChessPositionType position;
-
-    ReceivedPosition({required this.position});
+    ReceivedMove({required this.startSquare, required this.endSquare, required this.position});
 }
 
 class OwnPieceMoved extends ChessEvent {

lib/chess_bloc/chess_position.dart

@@ -3,29 +3,29 @@ import 'dart:developer';
 import 'package:mchess/utils/chess_utils.dart';
 
 typedef ChessMoveHistory = List<ChessMove>;
-typedef ChessPositionType = Map<ChessCoordinate, ChessPiece>;
+typedef ChessPosition = Map<ChessCoordinate, ChessPiece>;
 
-class ChessPosition {
-  static ChessPosition _instance = ChessPosition._internal();
+class ChessPositionManager {
+  static ChessPositionManager _instance = ChessPositionManager._internal();
   static ChessMoveHistory history = ChessMoveHistory.empty(growable: true);
-  final ChessPositionType position;
+  ChessPosition position;
 
-  ChessPosition({required this.position});
+  ChessPositionManager({required this.position});
 
-  factory ChessPosition._internal() {
-    return ChessPosition(position: _getStartingPosition());
+  factory ChessPositionManager._internal() {
+    return ChessPositionManager(position: _getStartingPosition());
   }
 
-  ChessPositionType get copyOfCurrentPosition => Map.from(position);
+  ChessPosition get copyOfCurrentPosition => Map.from(position);
 
-  ChessPositionType get currentPosition => position;
+  ChessPosition get currentPosition => position;
   ChessMove? get lastMove {
     if (history.isEmpty) return null;
     return history.last;
   }
 
-  ChessPositionType fromPGNString(String pgn) {
-    ChessPositionType pos = {};
+  ChessPosition fromPGNString(String pgn) {
+    ChessPosition pos = {};
     List<String> rowStrings;
 
     rowStrings = pgn.split('/');
@@ -53,7 +53,7 @@ class ChessPosition {
     }
   }
 
-  void logPosition(ChessPositionType p) {
+  void logPosition(ChessPosition p) {
     String logString = '';
 
     for (int row = 8; row > 0; row--) {
@@ -71,28 +71,26 @@ class ChessPosition {
     log(logString);
   }
 
-  void recordMove(ChessCoordinate from, ChessCoordinate to) {
-    position[to] = position[from] ?? const ChessPiece.none();
-    position[from] = const ChessPiece.none();
+  void recordMove(ChessCoordinate from, ChessCoordinate to, ChessPosition pos) {
+    position = pos;
 
     history.add(ChessMove(from: from, to: to));
 
     logPosition(position);
-
     logHistory(history);
   }
 
   void resetToStartingPosition() {
     history = ChessMoveHistory.empty(growable: true);
-    _instance = ChessPosition(position: _getStartingPosition());
+    _instance = ChessPositionManager(position: _getStartingPosition());
   }
 
-  static ChessPosition getInstance() {
+  static ChessPositionManager getInstance() {
     return _instance;
   }
 
-  static ChessPositionType _getStartingPosition() {
-    ChessPositionType pos = {};
+  static ChessPosition _getStartingPosition() {
+    ChessPosition pos = {};
 
     for (int i = 1; i <= 8; i++) {
       pos[ChessCoordinate(i, 7)] =

lib/connection/ws_connection.dart

@@ -88,12 +88,14 @@ class ServerConnection {
     var move = ChessMove.fromApiMove(apiMessage.move!);
 
     if (apiMessage.position != null) {
-      ChessBloc.getInstance().add(ReceivedPosition(
-          position:
-              ChessPosition.getInstance().fromPGNString(apiMessage.position!)));
+      ChessBloc.getInstance().add(ReceivedMove(
+          startSquare: move.from,
+          endSquare: move.to,
+          position: ChessPositionManager.getInstance()
+              .fromPGNString(apiMessage.position!)));
+    } else {
+      log('Error: no position received');
     }
-    ChessBloc.getInstance()
-        .add(ReceivedMove(startSquare: move.from, endSquare: move.to));
   }
 
   void handleInvalidMoveMessage(ApiWebsocketMessage apiMessage) {