# frozen_string_literal: true

class IMICFPS
  class Overlay
    include CommonMethods

    Slot = Struct.new(:value, :width)

    def initialize
      @text = CyberarmEngine::Text.new("", x: 3, y: 3, border_color: Gosu::Color::BLACK)
      @slots = []
      @space_width = @text.textobject.text_width(" ")
    end

    def draw
      return if @text.text.empty?

      width = @text.markup_width + 8

      Gosu.draw_rect(0, 0, width, (@text.height + 4), Gosu::Color.rgba(0, 0, 0, 100))
      Gosu.draw_rect(2, 2, width - 4, (@text.height + 4) - 4, Gosu::Color.rgba(100, 100, 100, 100))

      @text.draw

      sample_points = 256
      frame_stats = CyberarmEngine::Stats.frames.select(&:complete?)
      return if frame_stats.empty?

      right_origin = CyberarmEngine::Vector.new(10, 128)
      nodes = Array.new(sample_points) { [] }

      slice = 0
      frame_stats.each_slice((CyberarmEngine::Stats.max_frame_history / sample_points.to_f).ceil) do |bucket|
        bucket.each do |frame|
          nodes[slice] << frame.frame_timing.duration
        end

        slice += 1
      end

      points = []
      nodes.each_with_index do |cluster, i|
        break if cluster.empty?

        points << CyberarmEngine::Vector.new(right_origin.x + 1 * i, right_origin.y - cluster.max)
      end

      Gosu.draw_path(points, Gosu::Color::WHITE, Float::INFINITY) if points.size > 1
    end

    def update
      rebuild_slots
    end

    def rebuild_slots
      @slots.clear

      if window.config.get(:options, :fps)
        create_slot "FPS: #{Gosu.fps}"
        if window.config.get(:debug_options, :stats)
          create_slot "Frame time: #{(window.delta_time * 1000).round.to_s}ms"
        end
      end

      if window.config.get(:debug_options, :stats)
        create_slot "Vertices: #{formatted_number(window.renderer.opengl_renderer.number_of_vertices)}"
        create_slot "Faces: #{formatted_number(window.renderer.opengl_renderer.number_of_vertices / 3)}"
      end

      if window.config.get(:debug_options, :boundingboxes)
        create_slot "Boundingboxes: #{window.config.get(:debug_options, :boundingboxes) ? 'On' : 'Off'}"
      end

      if window.config.get(:debug_options, :wireframe)
        create_slot "Wireframes: #{window.config.get(:debug_options, :wireframe) ? 'On' : 'Off'}"
      end

      @text.text = ""
      @slots.each_with_index do |slot, i|
        @text.text += "#{slot.value} <c=ff000000>•</c> " unless i == @slots.size - 1
        @text.text += slot.value.to_s if i == @slots.size - 1
      end
    end

    def create_slot(string)
      @slots << Slot.new(string, @text.textobject.text_width(string))
    end
  end
end