TheCorrespondingSquares/chess-app

class Knight < Piece
after_create :icon

  def icon
    # if color == "White"
    #   '&#9816;'
    # else
    #   '&#9822;'
    # end
    '&#9822;'
  end

  def valid_move?(to_x, to_y)    
    return false if friendly_piece_on_square?(to_x, to_y)
    knight_move_wide?(to_x, to_y) || knight_move_tall?(to_x, to_y)
  end

  private

  def knight_move_wide?(to_x, to_y)
    (starting_point_x - to_x).abs == 2 && (starting_point_y - to_y).abs == 1
  end

  def knight_move_tall?(to_x, to_y)
    (starting_point_x - to_x).abs == 1 && (starting_point_y - to_y).abs == 2
  end

end