# Nathan Hinton
# This is the UI for the game and will contain all of the sub elements required.

# There will be three main areas that we will be in charge of. First, the
# bottom bar has the selector of item types. There will be a menu in the top
# right as well as any store things that we need/
class UI
  # Setup for the UI
  # @param width [Integer] Width of screen in pixels
  # @param height [Integer] Height of the screen in pixels
  def initialize(parent, width, height)
    @parent = parent
    @width = width
    @height = height
    @tool_selector = []
    @toolbar_width = width / 2
    @toolbar_height = height / 9
    @tool_info = [
      ['extractor', 96],
      ['belt', 32],
      ['adder', 64],
      ['delete', 32],
    ]
    @tool_selector_image = Gosu.render(@toolbar_width, @toolbar_height) {
      Gosu.draw_rect(
        0,
        0,
        @toolbar_width,
        @toolbar_height,
        Gosu::Color.new(0xC0, 0xFF, 0xFF, 0xFF),
        0)
      # Loop through the tools:
      @tool_info.each_with_index do |path, idx|
        Gosu::Image.new("assets/images/#{path[0]}.png").draw(
          idx * (@toolbar_height + 2),
          2,
          0,
          (@toolbar_height / path[1].to_f),
          (@toolbar_height / path[1].to_f),
        )
      end
      
    }
    @x = (@width / 2) - (@toolbar_width / 2)
    @y = @height - @toolbar_height
    @mouse_down_last_update = false
  end

  def update(mouse_x, mouse_y)
    managed = false
    # Only check if we are clicking
    if Gosu.button_down?(Gosu::MS_LEFT)
      if !@mouse_down_last_update
        puts 'mouse clicked'
        @mouse_down_last_update = true
        # Check if we are in the right y area:
        if mouse_y > @y
          # Check if we are within the right zone
          mouse_x_inset = mouse_x - @x
          if 0 < mouse_x_inset && mouse_x_inset < @toolbar_width
            managed = true
            item_index = mouse_x_inset / (@toolbar_height + 2)
            if item_index < @tool_info.length
              @parent.current_tool = @tool_info[item_index][0]
              puts "Selected item!"
            end
          end
        end
      end
    else
      @mouse_down_last_update = false
    end
    return managed
  end

  def draw()
    @tool_selector_image.draw(@x, @y)
  end
end