#pragma once

#include "vertex_engine/glfw/glfw.hpp"
#include "vertex_engine/gui/gui.hpp"
#include "vertex_engine/layer/layer.hpp"

namespace VE
{
  class application 
  {
    public:
      application(std::string app_name);
      virtual ~application() = default;

    private:
      std::unique_ptr<glfw> m_glfw;
      std::unique_ptr<gui> m_gui;
      layers_stack<layer> m_layers_stack;
      inline static std::unique_ptr<application> m_instance;

    public:
      void run();
      static std::unique_ptr<application>& get();
      std::unique_ptr<glfw>& get_glfw();

    public:
      template<typename... Args>
      void push_layer(Args*... args) 
      { 
        (m_layers_stack.push_back(args), ...); 
        (args->on_attach(), ...);
      }

    private:
      void clear();
      void attach_layers();
  };

  // реализация см. в проекте
  application& create();
}
