package dev.kske.chess.board;

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

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>Knight.java</strong><br>
 * Created: <strong>01.07.2019</strong><br>
 * Author: <strong>Kai S. K. Engelbart</strong>
 */
public class Knight extends Piece {

	public Knight(Color color, Board board) {
		super(color, board);
	}

	@Override
	public boolean isValidMove(Move move) {
		return Math.abs(move.xDist - move.yDist) == 1
				&& (move.xDist == 1 && move.yDist == 2 || move.xDist == 2 && move.yDist == 1) && checkDestination(move);
	}

	private void checkAndInsertMove(List<Move> moves, Position pos, int offsetX, int offsetY) {
		if (pos.x + offsetX >= 0 && pos.x + offsetX < 8 && pos.y + offsetY >= 0 && pos.y + offsetY < 8) {
			Move move = new Move(pos, new Position(pos.x + offsetX, pos.y + offsetY));
			if (checkDestination(move)) moves.add(move);
		}
	}

	@Override
	protected List<Move> getPseudolegalMoves(Position pos) {
		List<Move> moves = new ArrayList<>();
		checkAndInsertMove(moves, pos, -2, 1);
		checkAndInsertMove(moves, pos, -1, 2);
		checkAndInsertMove(moves, pos, 1, 2);
		checkAndInsertMove(moves, pos, 2, 1);
		checkAndInsertMove(moves, pos, -2, -1);
		checkAndInsertMove(moves, pos, -1, -2);
		checkAndInsertMove(moves, pos, 1, -2);
		checkAndInsertMove(moves, pos, 2, -1);
		return moves;
	}

	@Override
	public Type getType() { return Type.KNIGHT; }
}