## Nathan Hinton
## Main entry point for the game. Sets up the world and holds the main loop


require 'gosu'

require './producer.rb'

WIDTH = 640*2
HEIGHT = 480*2
CAMERA_MOVE_RANGE = 10
CAMERA_MOVE_SPEED = 1
CAMERA_MOVE_MAX_SPEED = (CAMERA_MOVE_RANGE * CAMERA_MOVE_SPEED / 2).to_i

class NumFactory < Gosu::Window
  def initialize
    super WIDTH, HEIGHT, :fullscreen => true, :update_interval => 16.666
    self.caption = "Number factory"

    @background_color = Gosu::Color::BLUE

    ### CAMERA ###
    # camera_x [Integer] Used to know the x position of the camera
    # camera_y [Integer] Used to know the y position of the camera
    # camera_zoom [Float] Used to know the zoom of the camera
    @camera_x = 0
    @camera_y = 0
    @camera_zoom = 1.0

    @producers = [
      Producer.new(0, 0, 1, 1),
      Producer.new(1000, 1000, 1, 1),
      Producer.new(2000, 2000, 1, 1),
    ]
    @consumers = []
    @belts = []

    @tick_time = 0
    
  end

  def button_down(id)
    if id == Gosu::KB_ESCAPE
      close
    else
      super
    end
  end


  ## Called every frame
  def update
    @tick_time = Time.now()
    ### CAMERA ###
    # Move the camera if needed
    if self.mouse_x < CAMERA_MOVE_RANGE
      @camera_x -= [(CAMERA_MOVE_SPEED * ((CAMERA_MOVE_RANGE - self.mouse_x ) / 2)).to_i, CAMERA_MOVE_MAX_SPEED].min
    elsif self.mouse_x > WIDTH - CAMERA_MOVE_RANGE
      @camera_x += [(CAMERA_MOVE_SPEED * ((CAMERA_MOVE_RANGE - (WIDTH - self.mouse_x) ) / 2)).to_i, CAMERA_MOVE_MAX_SPEED].min
    end

    if self.mouse_y < CAMERA_MOVE_RANGE
      @camera_y -= [(CAMERA_MOVE_SPEED * ((CAMERA_MOVE_RANGE - self.mouse_y ) / 2)).to_i, CAMERA_MOVE_MAX_SPEED].min
    elsif self.mouse_y > HEIGHT - CAMERA_MOVE_RANGE
      @camera_y += [(CAMERA_MOVE_SPEED * ((CAMERA_MOVE_RANGE - (HEIGHT - (self.mouse_y + 1)) ) / 2)).to_i, CAMERA_MOVE_MAX_SPEED].min
    end

    ### ITEMS ###
    @producers.each do |producer|
      producer.update
    end

    @belts.each do |belt|
      belt.update
    end

    @consumers.each do |consumer|
      consumer.update
    end
    @tick_time = Time.now() - @tick_time
  end

  ## Called when OS wants to update window.
  def draw
    # Draw mouse coords:
    Gosu.draw_rect(0, 0, self.width, self.height, @background_color, 0)
    @producers.each do |producer|
      if producer.x <= (@camera_x + WIDTH) && producer.x >= (@camera_x)
        if producer.y <= (@camera_y + WIDTH) && producer.y >= (@camera_y)
          producer.draw(@camera_x, @camera_y, @camera_zoom)
        end
      end
    end
    Gosu::Image.from_text("#{mouse_x}, #{mouse_y}", 20).draw(0, 100, 1)
    Gosu::Image.from_text("Tick time: #{@tick_time}", 20).draw(0, 25, 1)
    Gosu::Image.from_text("#{width}, #{height}", 20).draw(0, 0, 1)
    Gosu::Image.from_text("Camera location: #{@camera_x}, #{@camera_y}", 20).draw(0, 200, 1)
  end
end

NumFactory.new.show