import java.awt.*;
import java.util.*;

public abstract class Piece {
  Position pos;
  Image sprite;
  String color;

  public Piece(int x, int y, String color, Image sprite) {
    this.pos = new Position(x, y);
    this.color = color;
    this.sprite = sprite;
  }

  public void draw(Graphics g) {
    g.drawImage(sprite, pos.x * 40, pos.y * 40, null);
  }

  public abstract ArrayList<Position> getLegalMoves(Board board);

  public abstract ArrayList<Position> getPseudoLegalMoves(Board board);

  public abstract Piece copy();

  public boolean colorMatches(Piece p) {
    return this.color.equals(p.color);
  }

  public ArrayList<Position> slide(Board board, int dx, int dy) {
    ArrayList<Position> positions = new ArrayList<>();
    int step = 1;
    while (true) {
      Position test = new Position(pos.x + step * dx, pos.y + step * dy);
      if (!Board.inBounds(test)) break;
      if (board.isOpen(test)) {
        positions.add(test);
      } else if (board.getPiece(test).colorMatches(this)) {
        break;
      } else {
        positions.add(test);
        break;
      }
      step++;
    }
    return positions;
  }
}