#include "engine.hpp"

#include "log.hpp"

#include "window.hpp"
#include "input.hpp"
#include "resource_manager.hpp"
#include "sceneroot.hpp"

#include "gfx_device.hpp"

#include "resources/mesh.hpp"

struct UBO {
	glm::mat4 model{};
	glm::mat4 view{};
	glm::mat4 proj{};
};

static engine::gfx::Pipeline* pipeline;
static engine::gfx::Buffer* vb;
static engine::gfx::Buffer* ib;

namespace engine {

	Application::Application(const char* appName, const char* appVersion)
	{
		m_win = std::make_unique<Window>(appName, true);

		gfxdev = new GFXDevice(appName, appVersion, m_win->getHandle());

		m_input = std::make_unique<Input>(*m_win);
		m_res = std::make_unique<ResourceManager>();
		GameIO things{};
		things.win = m_win.get();
		things.input = m_input.get();
		things.resMan = m_res.get();
		m_scene = std::make_unique<SceneRoot>(things);
	}

	Application::~Application()
	{
		delete gfxdev;
	}

	void Application::gameLoop()
	{
		TRACE("Begin game loop...");

		uint64_t lastTick = m_win->getNanos();
		constexpr int TICKFREQ = 1; // in hz

		auto myMesh = m_res->get<resources::Mesh>("meshes/monke.mesh");

		// single-threaded game loop
		while (m_win->isRunning()) {

			/* logic */

			if (m_win->getLastFrameStamp() >= lastTick + (BILLION / TICKFREQ)) {
				lastTick = m_win->getLastFrameStamp();

				// do tick stuff here
				m_win->setTitle("frame time: " + std::to_string(m_win->dt() * 1000.0f) + " ms, " + std::to_string(m_win->getAvgFPS()) + " fps");
				m_win->resetAvgFPS();
			}

			if (m_win->getKeyPress(inputs::Key::F11)) {
				m_win->toggleFullscreen();
			}
			if (m_win->getKeyPress(inputs::Key::ESCAPE)) {
				m_win->setCloseFlag();
			}

			m_scene->updateStuff();

			/* draw */
			gfxdev->renderFrame();

			/* poll events */
			m_win->getInputAndEvents();

		}

		gfxdev->waitIdle();
	}

}