#pragma once
#ifndef H_WINDOW_
#define H_WINDOW_

#include <cstddef>
#include <functional>

#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>

#define UNUSED(x) (void)(x)

typedef std::function<void()> IFrameListener;

class WindowImpl {
public:
	WindowImpl() = default;
	virtual ~WindowImpl() = default;

	WindowImpl(const WindowImpl&) = delete;
	WindowImpl(WindowImpl&&) = delete;
protected:
	virtual bool Dispatch() = 0;
	virtual void OnFrame(IFrameListener fn) = 0;

	virtual size_t GetWidth() const = 0;
	virtual size_t GetHeight() const = 0;

	friend class Window;
};

class Window {
public:
  Window(size_t width, size_t height);
  virtual ~Window();

	static void Init();

  Window(const Window &) = delete;
  Window(Window &&) = delete;

public:
  bool Running() const;
	size_t GetWidth() const;
	size_t GetHeight() const;

public:
  void Run();
	void OnFrame(IFrameListener fn);

private:
	WindowImpl* m_impl;

private: // app logic
  uint32_t m_last_time;
  size_t m_width;
  size_t m_height;
  bool m_running;
};

#endif // H_WINDOW_