package chess.model;

public class Move {
	private final Coordinate start;
	private final Coordinate finish;
	private Coordinate deadPieceCoords;

	public Move(Coordinate start, Coordinate finish) {
		this.start = start;
		this.finish = finish;
		this.deadPieceCoords = finish;
	}

	public boolean isValid() {
		return this.start.isValid() && this.finish.isValid() && !this.start.equals(this.finish);
	}

	public Coordinate getStart() {
		return start;
	}

	public Coordinate getFinish() {
		return finish;
	}

	public int traversedCells() {
		assert isValid() : "Move is invalid!";

		int diffX = getFinish().getX() - getStart().getX();
		int diffY = getFinish().getY() - getStart().getY();

		assert Math.abs(diffX) < Coordinate.VALUE_MAX : "Move is too big!";
		assert Math.abs(diffX) < Coordinate.VALUE_MAX : "Move is too big!";

		if (diffX == 0)
			return Math.abs(diffY);
		if (diffY == 0)
			return Math.abs(diffX);
		if (Math.abs(diffX) == Math.abs(diffY))
			return Math.abs(diffX);
		return 0;
	}

	public Coordinate getMiddle() {
		return Coordinate.fromIndex((getStart().toIndex() + getFinish().toIndex()) / 2);
	}

	public void setDeadPieceCoords(Coordinate deadCoords) {
		this.deadPieceCoords = deadCoords;
	}

	public Coordinate getDeadPieceCoords() {
		return deadPieceCoords;
	}

}