#include <SDL2/SDL.h>
#include <glm/glm.hpp>

#include "camera.h"
#include "dumbLog.h"
#include "renderer.h"
#include "entity.h"


typedef void (*frame_callback_fn) (render_state*);

void
doFrameCallback(render_state* rs)
{
}

void
doRenderLoop(render_state* rs, frame_callback_fn callback_fn, Entity* entities, uint entity_count)
{
	// TODO: move frame delay to renderFrame()
	const uint TARGET_FPS = 60;
	const uint FRAME_DELAY = 1000 / TARGET_FPS;
	uint frameStart, frameTime;
	bool running = true;
	SDL_Event e;

	while (running) {
		frameStart = SDL_GetTicks();

		// TODO: add a better structure for input, and provide a callback to use here
		while (SDL_PollEvent(&e)) {
			if ((e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_ESCAPE)
				|| e.type == SDL_QUIT) {
				running = false;
			}
		}

		callback_fn(rs);
		// TODO: entity pointer and entity count should be stored somewhere on the render_state object
		renRenderFrame(rs, entities, entity_count);
		SDL_GL_SwapWindow(rs->handles.window);
		frameTime = SDL_GetTicks() - frameStart;

		if (FRAME_DELAY > frameTime)
			SDL_Delay(FRAME_DELAY - frameTime);
	}
}

int
main()
{
	render_state* rs = renInit();

	meInitAssimp();

	// TODO: entInit() doesn't allocate memory because we want to do the allocation in
	// 	one big block, but this is really clunky to use
	Entity spaceship;

	// TODO: this should be handled in entInit
	entSetWorldPosition(spaceship, 0, 0, 0);

	// set entity scale, rotation, world_transform to defaults :( ...

	// need to finish loading binary texture data in mesh::loadDiffuseTexture()

	// setup camera
	glm::vec3 cam_pos(0, -100, 100);
	cameraInitPerspective(rs->cam, cam_pos, spaceship.translation, rs->cam.world_up);

	if (entInit(spaceship, "../data/spaceship.glb", rs->default_shader)) {
		doRenderLoop(rs, doFrameCallback, &spaceship, 1);
	} else {
		LOG(Error) << "Error initializing entity, exiting\n";
	}


	// TODO: way more cleanup to do :(, see hexgame::cleanUp()
	meShutdownAssimp();
	return 0;
}