#pragma once

#include <forstio/window/xcb.hpp>

#ifndef SAW_OGL
#error "OpenGL is not supported"
#endif

#include "gl_backends.hpp"
#include "gl_context.hpp"
#include "gl_window.hpp"

#include <GL/glx.hpp>

namespace saw {
namespace gfx {

struct glx_library_extensions {
public:
	std::string_view raw_extension_string;
	GLXContext (*glXCreateContextAttribsARB)(Display*, GLXFBConfig, GLXContext, Bool, const int*) = nullptr;
};

template<>
class gpu_context<backend::gl_linux_xcb> final {
private:
	glx_library_extensions ext_lib_;
	own<device<backend::linux_xcb>> device_;
	int visual_id_;
	GLXContext context_;
	GLXFBConfig fb_config_;

	friend class gpu_window<backend::gl_linux_xcb>;
public:
	gpu_context(const glx_library_extensions&, own<device<backend::linux_xcb>>, int, GLXContext, GLXFBConfig);
	~gpu_context();

	own<gpu_window<backend::gl_linux_xcb>> create_window(const video_mode&, std::string_view);

	void flush();
};

template<>
class gpu_window<backend::gl_linux_xcb> final {
private:
	own<window<backend::linux_xcb>> window_;
	gpu_context<backend::gl_linux_xcb>* context_;

	::GLXWindow glx_window_handle_;
public:
	gpu_window(own<window<backend::linux_xcb>> window, gpu_context<backend::gl_linux_xcb>& ctx,
			::GLXWindow);
	~gpu_window();

	void bind();
	void swap();
	void show();
	void hide();

	const video_mode& get_video_mode() const;
	const std::string_view get_title() const;

	void resize(size_t height, size_t width);

	conveyor<data<schema::WindowEvents>> on_event();
};
}
}