class Opponent < SomePlayer
  def initialize(board)
    super(board)
    @name = 'Computer'
    @positions = []
    @computed_options = []
  end

  def shoot
    available_choices = get_available_options
    coordinate = ShootingCompetitiveCoordinateInput.new(available_choices).fetch

    # if shoot successful
    if @board.set_shoot(coordinate)
      if @positions.size == 3
        @computed_options = []
      else
        @positions << coordinate
        @computed_options = Board.clean_outer(HellTetrisStrategy.new(@positions, @positions.size + 1).places)
      end
    end
    update_computed_options(coordinate)
  end

  private

  def update_computed_options(coordinate)
    @computed_options.delete(coordinate) # can work without checking
    @possible_choices.delete(coordinate)
    unless get_computed_options.any?
      @positions = []
      @computed_options = []
    end
  end

  def get_available_options
    get_computed_options.any? ? get_computed_options : @possible_choices
  end

  def get_computed_options
    @possible_choices & @computed_options
  end
end