package dev.kske.chess.board;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>Move.java</strong><br>
 * Created: <strong>02.07.2019</strong><br>
 * Author: <strong>Kai S. K. Engelbart</strong>
 */
public class Move {

	public final Position	pos, dest;
	public final int		xDist, yDist, xSign, ySign;
	public Type				type;

	public Move(Position pos, Position dest, Type type) {
		this.pos	= pos;
		this.dest	= dest;
		this.type	= type;
		xDist		= Math.abs(dest.x - pos.x);
		yDist		= Math.abs(dest.y - pos.y);
		xSign		= (int) Math.signum(dest.x - pos.x);
		ySign		= (int) Math.signum(dest.y - pos.y);
	}

	public Move(Position pos, Position dest) {
		this(pos, dest, Type.NORMAL);
	}

	public Move(int xPos, int yPos, int xDest, int yDest) {
		this(new Position(xPos, yPos), new Position(xDest, yDest));
	}

	public static Move fromSAN(String move) {
		return new Move(Position.fromSAN(move.substring(0, 2)),
				Position.fromSAN(move.substring(2)));
	}

	public String toSAN() {
		return pos.toSAN() + dest.toSAN();
	}

	public boolean isHorizontal() { return yDist == 0; }

	public boolean isVertical() { return xDist == 0; }

	public boolean isDiagonal() { return xDist == yDist; }

	@Override
	public String toString() {
		return String.format("%s -> %s", pos, dest);
	}

	public static enum Type {
		NORMAL, PAWN_PROMOTION, CASTLING, EN_PASSANT, UNKNOWN
	}
}