#pragma once

#include <condition_variable>
#include <mutex>
#include "Common/Sizes.hpp"
#include "GFX/Actions.hpp"
#include "GFX/Camera.hpp"
#include "GFX/Texture.hpp"
#include "GFX/Window.hpp"

namespace MC {

class Render {
public:
    struct Scene {
        GFX::Actions actions;
        GFX::Camera camera;
    };

    struct Control {
        std::mutex mutex;
        std::condition_variable cv;
        Bool logic_done = false;
        Bool render_done = false;

        Scene scene;

        void send_render_data(Scene new_scene) {
            {
                std::scoped_lock lock(mutex);
                scene = std::move(new_scene);
                logic_done = true;
            }
            cv.notify_one();
        }

        Scene wait_for_render_data() {
            Scene new_scene;
            {
                std::unique_lock lock(mutex);
                cv.wait(lock, [&]{
                    return logic_done;
                });
                new_scene = scene;
                logic_done = false;
                render_done = false;
            }
            cv.notify_one();
            return new_scene;
        }

        void wait_for_render_finish() {
            {
                std::unique_lock lock(mutex);
                cv.wait(lock, [&]{
                    return render_done;
                });
                logic_done = false;
                render_done = false;
            }
            cv.notify_one();
        }

        void finish_render() {
            {
                std::scoped_lock lock(mutex);
                render_done = true;
            }
            cv.notify_one();
        }
    };

    explicit Render(GFX::Window& window, std::shared_ptr<Control> control)
        : m_window(window)
        , m_control(std::move(control)) {}

    void run();

private:
    void render_scene(Scene const& actions, GFX::Texture const& texture) const;
    static void setup_gl();

    void wait_until_next_frame_start(Real spent_time_budget) const;

    GFX::Resources m_resources;
    GFX::Window& m_window;
    std::shared_ptr<Control> m_control;
};

}