package dev.kske.chess.board;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>EnPassant.java</strong><br>
 * Created: <strong>2 Nov 2019</strong><br>
 *
 * @since Chess v0.5-alpha
 * @author Kai S. K. Engelbart
 */
public class EnPassant extends Move {

	private final Position capturePos;

	/**
	 * Initializes an en passant move.
	 *
	 * @param pos  the position of this move
	 * @param dest the destination of this move
	 */
	public EnPassant(Position pos, Position dest) {
		super(pos, dest);
		capturePos = new Position(dest.x, dest.y - ySign);
	}

	/**
	 * Initializes an en passant move.
	 *
	 * @param xPos  the horizontal position of this move
	 * @param yPos  the vertical position of this move
	 * @param xDest the horizontal destination of this move
	 * @param yDest the vertical destination of this move
	 */
	public EnPassant(int xPos, int yPos, int xDest, int yDest) {
		this(new Position(xPos, yPos), new Position(xDest, yDest));
	}

	@Override
	public void execute(Board board) {
		super.execute(board);
		board.set(capturePos, null);
	}

	@Override
	public void revert(Board board, Piece capturedPiece) {
		super.revert(board, capturedPiece);
		board.set(
			capturePos,
			new Pawn(board.get(pos).getColor().opposite(), board)
		);
	}

	/**
	 * @return the position of the piece captures by this move
	 */
	public Position getCapturePos() { return capturePos; }
}