## Nathan Hinton
## A number consumer that will create numbers when an extractor is placed on it.

CONSUMER_DEBUG = false
BORDER = 2
SIZE = 3

class Consumer
  attr_reader :draw_x, :draw_y
  # Create consumer at a position with the number and rate specified
  # @param x [Integer] X position to start at
  # @param y [Integer] Y position to start at
  def initialize(x, y, box_size, screen_width, screen_height)
    @x = x - SIZE / 2
    @y = y - SIZE / 2
    @box_size = box_size
    @screen_width = screen_width
    @screen_height = screen_height
    @image = Gosu.render((SIZE * @box_size) - (2 * BORDER), (SIZE * @box_size) - (2 * BORDER)) {
      Gosu.draw_rect(0, 0, (SIZE * @box_size) - (2 * BORDER), (SIZE * @box_size) - (2 * BORDER), Gosu::Color::GREEN, 0)
    }
  end

  # Consumes numbers created
  # @param delta_mult [Float] The delta multiplier for any actions
  # @param camera_x [Integer] The camera X position
  # @param camera_y [Integer] The camera Y position
  # @param camera_zoom [Float] The camera zoom
  def update(delta_mult, camera_x, camera_y, camera_zoom)
    @draw_x = (((((@screen_width / @box_size.to_f) / 2.0) + (@x - camera_x) * camera_zoom) * @box_size) + BORDER * camera_zoom)
    @draw_y = (((((@screen_height / @box_size.to_f) / 2.0) + (@y - camera_y) * camera_zoom) * @box_size) + BORDER * camera_zoom)
    @camera_zoom = camera_zoom
    
  end

  # Draw the consumer. Uses the camera x and y to shift where it should draw
  def draw()
    if PRODUCER_DEBUG
      puts "Drawing at #{@x - camera_x}, #{@y - camera_y}"
    end
    @image.draw(@draw_x, @draw_y, 0, @camera_zoom, @camera_zoom)
  end
end