chess/src/main/java/dev/kske/chess/board/Queen.java

package dev.kske.chess.board;

import java.util.ArrayList;
import java.util.List;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>Queen.java</strong><br>
 * Created: <strong>01.07.2019</strong><br>
 *
 * @since Chess v0.1-alpha
 * @author Kai S. K. Engelbart
 */
public class Queen extends Piece {

	/**
	 * Creates queen {@link Piece}.
	 *
	 * @param color the color of this queen
	 * @param board the board on which this queen will be placed
	 */
	public Queen(Color color, Board board) {
		super(color, board);
	}

	@Override
	public boolean isValidMove(Move move) {
		return (move.isHorizontal() || move.isVertical() || move.isDiagonal())
			&& isFreePath(move);
	}

	@Override
	protected List<Move> getPseudolegalMoves(Position pos) {
		List<Move> moves = new ArrayList<>();

		// Horizontal moves to the right
		for (int i = pos.x + 1; i < 8; i++) {
			Move move = new Move(pos, new Position(i, pos.y));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Horizontal moves to the left
		for (int i = pos.x - 1; i >= 0; i--) {
			Move move = new Move(pos, new Position(i, pos.y));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Vertical moves to the top
		for (int i = pos.y - 1; i >= 0; i--) {
			Move move = new Move(pos, new Position(pos.x, i));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Vertical moves to the bottom
		for (int i = pos.y + 1; i < 8; i++) {
			Move move = new Move(pos, new Position(pos.x, i));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Diagonal moves to the lower right
		for (int i = pos.x + 1, j = pos.y + 1; i < 8 && j < 8; i++, j++) {
			Move move = new Move(pos, new Position(i, j));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Diagonal moves to the lower left
		for (int i = pos.x - 1, j = pos.y + 1; i >= 0 && j < 8; i--, j++) {
			Move move = new Move(pos, new Position(i, j));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Diagonal moves to the upper right
		for (int i = pos.x + 1, j = pos.y - 1; i < 8 && j >= 0; i++, j--) {
			Move move = new Move(pos, new Position(i, j));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		// Diagonal moves to the upper left
		for (int i = pos.x - 1, j = pos.y - 1; i >= 0 && j >= 0; i--, j--) {
			Move move = new Move(pos, new Position(i, j));
			if (
				board.getDest(move) == null
					|| board.getDest(move).getColor() != getColor()
			) {
				moves.add(move);
				if (board.getDest(move) != null)
					break;
			} else
				break;
		}
		return moves;
	}

	@Override
	public int getValue() { return 90; }
}