class IMICFPS
  def self.assets_path
    File.expand_path("./../../assets", __FILE__)
  end

  module CommonMethods

    def window; $window; end

    def delta_time; (Gosu.milliseconds - window.delta_time) / 1000.0; end
    def button_down?(id); window.button_down?(id); end

    def mouse_x; window.mouse_x; end
    def mouse_y; window.mouse_y; end
    def mouse_x=(int); window.mouse_x = int; end
    def mouse_y=(int); window.mouse_y = int; end

    def gl(&block)
      window.gl do
        block.call
      end
    end

    def formatted_number(number)
      string = number.to_s.reverse.scan(/\d{1,3}/).join(",").reverse

      string.insert(0, "-") if number < 0

      return string
    end

    def control_down?; button_down?(Gosu::KbLeftControl) || button_down?(Gosu::KbRightControl); end
    def shift_down?; button_down?(Gosu::KbLeftShift) || button_down?(Gosu::KbRightShift); end
    def alt_down?; button_down?(Gosu::KbLeftAlt) || button_down?(Gosu::KbRightAlt); end

    def draw_rect(*args)
      window.draw_rect(*args)
    end
    def draw_quad(*args)
      window.draw_quad(*args)
    end
    def fill(color = Gosu::Color::WHITE, z = 0)
      draw_rect(0, 0, window.width, window.height, color, z)
    end
    def fill_quad(x1, y1, x2, y2, x3, y3, x4, y4, color = Gosu::Color::WHITE, z = 0, mode = :default)
      draw_quad(
        x1,y1, color,
        x2,y2, color,
        x3,y3, color,
        x4,y4, color,
        z, mode
        )
    end

    def menu_background(primary_color, accent_color, color_step, transparency, bar_size, slope)
      ((Gosu.screen_height + slope) / bar_size).times do |i|
        color = Gosu::Color.rgba(
          primary_color.red - i * color_step,
          primary_color.green - i * color_step,
          primary_color.blue - i * color_step,
          transparency
        )

        fill_quad(
          0, i * bar_size,
          0, slope + (i * bar_size),
          window.width / 2, (-slope) + (i * bar_size),
          window.width / 2, i * bar_size,
          color,
          -2
        )
        fill_quad(
          window.width, i * bar_size,
          window.width, slope + (i * bar_size),
          window.width / 2, (-slope) + (i * bar_size),
          window.width / 2, i * bar_size,
          color,
          -2
        )
      end

      Gosu.draw_quad(
        0, 0, primary_color,
        window.width, 0, primary_color,
        window.width, window.height, accent_color,
        0, window.height, accent_color,
        -2
      )
    end

    def gl_error?
      e = glGetError()
      if e != GL_NO_ERROR
        $stderr.puts "OpenGL error detected by handler at: #{caller[0]}"
        $stderr.puts "    #{gluErrorString(e)} (#{e})\n"
        exit if window.config.get(:debug_options, :opengl_error_panic)
      end
    end
  end
end