mchess-client/lib/chess_bloc/chess_position.dart

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import 'dart:developer';
import 'package:mchess/utils/chess_utils.dart';
typedef ChessMoveHistory = List<ChessMove>;
typedef ChessPosition = Map<ChessCoordinate, ChessPiece>;
class ChessPositionManager {
static ChessPositionManager _instance = ChessPositionManager._internal();
static ChessMoveHistory history = ChessMoveHistory.empty(growable: true);
ChessPosition position;
ChessPositionManager({required this.position});
factory ChessPositionManager._internal() {
return ChessPositionManager(position: _getStartingPosition());
}
ChessPosition get copyOfCurrentPosition => Map.from(position);
ChessPosition get currentPosition => position;
ChessMove? get lastMove {
if (history.isEmpty) return null;
return history.last;
}
ChessPosition fromPGNString(String pgn) {
ChessPosition pos = {};
List<String> rowStrings;
rowStrings = pgn.split('/');
for (int row = 1; row <= 8; row++) {
for (int col = 1; col <= 8; col++) {
var piece = rowStrings.elementAt(row - 1)[col - 1];
if (piece == '-') {
continue;
}
pos[ChessCoordinate(col, row)] = pieceFromShortname[piece]!;
}
}
return pos;
}
ChessPiece? getPieceAt(ChessCoordinate coordinate) {
return position[ChessCoordinate(coordinate.column, coordinate.row)];
}
void logHistory(ChessMoveHistory hist) {
for (var element in hist) {
log('${element.from.toAlphabetical()} -> ${element.to.toAlphabetical()}');
}
}
void logPosition(ChessPosition p) {
String logString = '';
for (int row = 8; row > 0; row--) {
for (int col = 1; col <= 8; col++) {
var coord = ChessCoordinate(col, row);
if (p.containsKey(coord)) {
logString = '$logString ${p[coord]?.shortName}';
} else {
logString = '$logString .';
}
}
logString = '$logString\n';
}
log(logString);
}
void recordMove(
ChessCoordinate? from, ChessCoordinate? to, ChessPosition pos) {
position = pos;
history.add(
ChessMove(
from: from ?? ChessCoordinate.none(),
to: to ?? ChessCoordinate.none(),
),
);
logPosition(position);
logHistory(history);
}
void resetToStartingPosition() {
history = ChessMoveHistory.empty(growable: true);
_instance = ChessPositionManager(position: _getStartingPosition());
}
static ChessPositionManager getInstance() {
return _instance;
}
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static ChessPosition _getDebugPostion() {
ChessPosition pos = {};
pos[ChessCoordinate(7, 7)] =
ChessPiece(ChessPieceClass.pawn, ChessColor.white);
return pos;
}
static ChessPosition _getStartingPosition() {
ChessPosition pos = {};
for (int i = 1; i <= 8; i++) {
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pos[ChessCoordinate(i, 7)] =
ChessPiece(ChessPieceClass.pawn, ChessColor.black);
pos[ChessCoordinate(i, 2)] =
ChessPiece(ChessPieceClass.pawn, ChessColor.white);
}
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pos[ChessCoordinate(1, 8)] =
ChessPiece(ChessPieceClass.rook, ChessColor.black);
pos[ChessCoordinate(2, 8)] =
ChessPiece(ChessPieceClass.knight, ChessColor.black);
pos[ChessCoordinate(3, 8)] =
ChessPiece(ChessPieceClass.bishop, ChessColor.black);
pos[ChessCoordinate(4, 8)] =
ChessPiece(ChessPieceClass.queen, ChessColor.black);
pos[ChessCoordinate(5, 8)] =
ChessPiece(ChessPieceClass.king, ChessColor.black);
pos[ChessCoordinate(6, 8)] =
ChessPiece(ChessPieceClass.bishop, ChessColor.black);
pos[ChessCoordinate(7, 8)] =
ChessPiece(ChessPieceClass.knight, ChessColor.black);
pos[ChessCoordinate(8, 8)] =
ChessPiece(ChessPieceClass.rook, ChessColor.black);
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pos[ChessCoordinate(1, 1)] =
ChessPiece(ChessPieceClass.rook, ChessColor.white);
pos[ChessCoordinate(2, 1)] =
ChessPiece(ChessPieceClass.knight, ChessColor.white);
pos[ChessCoordinate(3, 1)] =
ChessPiece(ChessPieceClass.bishop, ChessColor.white);
pos[ChessCoordinate(4, 1)] =
ChessPiece(ChessPieceClass.queen, ChessColor.white);
pos[ChessCoordinate(5, 1)] =
ChessPiece(ChessPieceClass.king, ChessColor.white);
pos[ChessCoordinate(6, 1)] =
ChessPiece(ChessPieceClass.bishop, ChessColor.white);
pos[ChessCoordinate(7, 1)] =
ChessPiece(ChessPieceClass.knight, ChessColor.white);
pos[ChessCoordinate(8, 1)] =
ChessPiece(ChessPieceClass.rook, ChessColor.white);
return pos;
}
}