package dev.kske.chess.board;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>Position.java</strong><br>
 * Created: <strong>02.07.2019</strong><br>
 *
 * @since Chess v0.1-alpha
 * @author Kai S. K. Engelbart
 */
public class Position {

	/**
	 * The horizontal component of this position.
	 */
	public final int x;

	/**
	 * The vertical component of this position.
	 */
	public final int y;

	/**
	 * Initializes a position.
	 *
	 * @param x the horizontal component of this position
	 * @param y the vertical component of this position
	 */
	public Position(int x, int y) {
		this.x = x;
		this.y = y;
	}

	/**
	 * Constructs a position from Long Algebraic Notation (LAN)
	 *
	 * @param pos the LAN string to construct a position from
	 * @return the position constructed from LAN
	 */
	public static Position fromLAN(String pos) {
		return new Position(
			pos.charAt(0) - 97,
			8 - Character.getNumericValue(pos.charAt(1))
		);
	}

	/**
	 * Converts this position to Long Algebraic Notation (LAN)
	 *
	 * @return a LAN string representing this position
	 */
	public String toLAN() {
		return String.valueOf((char) (x + 97)) + String.valueOf(8 - y);
	}

	@Override
	public String toString() {
		return String.format("[%d, %d]", x, y);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + x;
		result = prime * result + y;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Position other = (Position) obj;
		if (x != other.x)
			return false;
		if (y != other.y)
			return false;
		return true;
	}
}