81 lines
1.8 KiB
Java
81 lines
1.8 KiB
Java
package chess.io.commands;
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import chess.io.OutputSystem;
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import chess.io.PlayerCommand;
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import chess.model.ChessBoard;
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import chess.model.Coordinate;
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import chess.model.Game;
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import chess.model.Move;
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import chess.model.Piece;
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import chess.model.visitor.PiecePathChecker;
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public class MoveCommand extends PlayerCommand {
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private final Move move;
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private Piece deadPiece;
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public MoveCommand(Move move) {
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this.move = move;
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this.deadPiece = null;
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}
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public Move getMove() {
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return move;
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}
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@Override
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public CommandResult execute(Game game, OutputSystem outputSystem) {
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final ChessBoard board = game.getBoard();
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// we must promote the pending pawn before
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if (game.pawnShouldBePromoted())
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return CommandResult.NotAllowed;
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Piece piece = board.pieceAt(move.getStart());
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if (piece == null)
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return CommandResult.NotAllowed;
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if (piece.getColor() != game.getPlayerTurn())
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return CommandResult.NotAllowed;
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boolean valid = new PiecePathChecker(board, move).isValid();
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if (!valid)
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return CommandResult.NotAllowed;
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this.deadPiece = board.pieceAt(move.getFinish());
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board.applyMove(move);
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if (board.isKingInCheck(game.getPlayerTurn())) {
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board.undoLastMove();
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return CommandResult.NotAllowed;
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}
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if (game.pawnShouldBePromoted())
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return CommandResult.ActionNeeded;
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return CommandResult.Moved;
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}
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@Override
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public void undo(Game game, OutputSystem outputSystem) {
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final ChessBoard board = game.getBoard();
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board.undoMove(move, deadPiece);
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}
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@Override
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public void postExec(Game game, OutputSystem outputSystem) {
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tryPromote(game, outputSystem);
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}
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private void tryPromote(Game game, OutputSystem outputSystem) {
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Coordinate pawnPos = game.pawnPromotePosition();
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if (pawnPos == null)
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return;
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outputSystem.promotePawn(pawnPos);
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}
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}
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