void
game_startup(memory_t* memory)
{
	if (SDL_BYTEORDER != SDL_LIL_ENDIAN)
	{
		LOG_ERROR("Machine is Big Endian; expected Little Endian.");
		exit(EXIT_FAILURE);
	}

	g_memory = memory;

	engine_t* engine = engine_mem_alloc(1, sizeof(*engine));
	g_engine = engine;

	game_t* game = game_mem_alloc(1, sizeof(*game));
	g_game = game;

	g_asset_mgr = &engine->asset_mgr;
	g_audio_mgr = &engine->audio_mgr;
	g_render_mgr = &engine->render_mgr;

	asset_mgr_startup();
	audio_mgr_startup();
	render_mgr_startup();

	// Load data
	game->data = data_load("data.bin");
	data_t* data = &game->data;
	state_t* state = &game->state;
	ui_t* ui = &game->ui;

	state->mode = MODE_MAIN_MENU;
	state->mode_last = MODE_MAIN_MENU;

	// Set up menus
	ui->main_menu = (ui_menu_t){
		.widget_count = 3,
		.widgets = {
			{"Play", WINDOW_WIDTH/2, WINDOW_HEIGHT/2, menu_play},
			{"Options", WINDOW_WIDTH/2, WINDOW_HEIGHT/2 + 40, menu_options},
			{"Quit", WINDOW_WIDTH/2, WINDOW_HEIGHT/2 + 80, menu_quit}},
	};

	ui->pause_menu = (ui_menu_t){
		.widget_count = 3,
		.widgets = {
			{"Resume", WINDOW_WIDTH/2, WINDOW_HEIGHT/2, menu_play},
			{"Options", WINDOW_WIDTH/2, WINDOW_HEIGHT/2 + 40, menu_options},
			{"Quit", WINDOW_WIDTH/2, WINDOW_HEIGHT/2 + 80, menu_quit}},
	};

	ui->options_menu = (ui_menu_t){
		.widget_count = 1,
		.widgets = {
			{"Exit", WINDOW_WIDTH/2, WINDOW_HEIGHT/2, menu_exit}},
	};

	// Create systems
	state->camera = camera_create((vec3){28.0f, 29.0f, 1.0f});

	audio_source_t audio_source = {
		.wav = get_sfx_by_name("SFX_Enemy"),
		.is_looping = true,
		.stereo = true};

	// Set up world
	state->skulls[0].tile_pos.x = 1;
	state->skulls[0].tile_pos.y = 1;
	state->skulls[0].front = (vec3){0.0f, 1.0f, 0.0f};
	audio_source.position = (vec3){
		state->skulls[0].tile_pos.x*2.0f+1.0f,
		state->skulls[0].tile_pos.y*2.0f+1.0f,
		1.0f};
	state->skulls[0].audio_source_handle = play_sound(audio_source);

	state->skulls[1].tile_pos.x = 26;
	state->skulls[1].tile_pos.y = 1;
	state->skulls[1].front = (vec3){0.0f, 1.0f, 0.0f};
	audio_source.position = (vec3){
		state->skulls[1].tile_pos.x*2.0f+1.0f,
		state->skulls[1].tile_pos.y*2.0f+1.0f,
		1.0f};
	state->skulls[1].audio_source_handle = play_sound(audio_source);

	state->skulls[2].tile_pos.x = 1;
	state->skulls[2].tile_pos.y = 29;
	state->skulls[2].front = (vec3){0.0f, -1.0f, 0.0f};
	audio_source.position = (vec3){
		state->skulls[2].tile_pos.x*2.0f+1.0f,
		state->skulls[2].tile_pos.y*2.0f+1.0f,
		1.0f};
	state->skulls[2].audio_source_handle = play_sound(audio_source);

	state->skulls[3].tile_pos.x = 26;
	state->skulls[3].tile_pos.y = 29;
	state->skulls[3].front = (vec3){0.0f, -1.0f, 0.0f};
	audio_source.position = (vec3){
		state->skulls[3].tile_pos.x*2.0f+1.0f,
		state->skulls[3].tile_pos.y*2.0f+1.0f,
		1.0f};
	state->skulls[3].audio_source_handle = play_sound(audio_source);

	state->nodes[0] = (node_t){
		.transform = (transform_t){(vec3){28.0f, 33.0f, 1.5f}, (vec3){0.0f, 0.0f, 0.0f}, (vec3){0.5f, 0.5f, 0.5f}},
		.parent = -1,
		.children = {1, 2, 3},
		.matrix = mat4_identity(),
		.rotation = mat4_identity()};

	state->nodes[1] = (node_t){
		.transform = (transform_t){(vec3){-0.5f, 0.0f, 0.0f}, (vec3){0.0f, 0.0f, 0.0f}, (vec3){1.0f, 1.0f, 1.0f}},
		.parent = 0,
		.children = {-1, -1, -1},
		.matrix = mat4_identity(),
		.rotation = mat4_identity()};

	state->nodes[2] = (node_t){
		.transform = (transform_t){(vec3){0.0f, 0.0f, 0.0f}, (vec3){0.0f, 0.0f, 0.0f}, (vec3){1.0f, 1.0f, 1.0f}},
		.parent = 0,
		.children = {-1, -1, -1},
		.matrix = mat4_identity(),
		.rotation = mat4_identity()};

	state->nodes[3] = (node_t){
		.transform = (transform_t){(vec3){0.5f, 0.0f, 0.0f}, (vec3){0.0f, 0.0f, 0.0f}, (vec3){1.0f, 1.0f, 1.0f}},
		.parent = 0,
		.children = {-1, -1, -1},
		.matrix = mat4_identity(),
		.rotation = mat4_identity()};

	// Initalize footsteps
	state->footstep_timer = FOOTSTEP_TIMER;
	state->footstep_cycle = false;

	// Create a copy of the game items so we can restore the original layout on new game/level
	state->coin_count = data->items.coin_count;
	state->eyeball_count = data->items.eyeball_count;
	state->coins = game_mem_alloc(data->items.coin_count, sizeof(*state->coins));
	state->eyeballs = game_mem_alloc(data->items.eyeball_count, sizeof(*state->eyeballs));
	memcpy(state->coins, data->items.coins, data->items.coin_count * sizeof(*data->items.coins));

	for (int i = 0; i < state->eyeball_count; i++)
	{
		state->eyeballs[i].transform = data->items.eyeballs[i];
		state->eyeballs[i].used = false;
	}

	g_audio_mgr->listener.position = state->camera.position;
	g_audio_mgr->listener.front = state->camera.front;
	g_audio_mgr->listener.up = WORLD_UP;

	audio_source_t creepy_music = {
		.wav = get_music_by_name("MUS_Ambience"),
		.is_looping = true};

	state->background_music_handle = play_sound(creepy_music);

	audio_source_t enemy_sfx = {
		.position = {28.0f, 33.0f, 1.0f},
		.wav = get_sfx_by_name("SFX_SafeZone"),
		.stereo = true,
		.is_looping = true};

	play_sound(enemy_sfx);
}

void
game_shutdown(void)
{
}

void
game_update(memory_t* memory, float dt, input_t input, bool* quit_requested)
{
	// Re-cache memory pointer in case of DLL reload
	g_memory = memory;

	engine_t* engine = (engine_t*)memory->engine.begin;
	game_t* game = (game_t*)memory->game.begin;
	state_t* state = &game->state;
	ui_t* ui = &game->ui;

	// Re-cache
	g_game = game;
	g_asset_mgr = &engine->asset_mgr;
	g_audio_mgr = &engine->audio_mgr;
	g_render_mgr = &engine->render_mgr;

	state->time += dt;

	if (input.pause && input.pause != state->input_prev.pause)
	{
		state->mode = MODE_PAUSE;
	}

	switch (state->mode)
	{
		case MODE_MAIN_MENU:
		{
			menu_update(input, &ui->main_menu);
		} break;
		case MODE_OPTIONS:
		{
			menu_update(input, &ui->options_menu);
		} break;
		case MODE_PAUSE:
		{
			menu_update(input, &ui->pause_menu);
		} break;
		case MODE_PLAY:
		{
			play(dt, input);
		} break;
		case MODE_QUIT:
		{
			*quit_requested = true;
		}
		default: break;
	}

	state->input_prev = input;
}

void
game_render(void)
{
	state_t* state = &g_game->state;
	ui_t* ui = &g_game->ui;

	reload_shaders();

	switch (state->mode)
	{
		case MODE_MAIN_MENU:
		{
			menu_render(&ui->main_menu);
		} break;
		case MODE_OPTIONS:
		{
			menu_render(&ui->options_menu);
		} break;
		case MODE_PAUSE:
		{
			menu_render(&ui->pause_menu);
		} break;
		case MODE_PLAY:
		{
			render_geo();
			render_screen();
		} break;
		default: break;
	}
}

void
game_debug(uint64_t update_time, uint64_t render_time, uint64_t frame_time)
{
	state_t* state = &g_game->state;

	switch (state->mode)
	{
		case MODE_PLAY:
		{
			debug(update_time, render_time, frame_time);
		} break;
		default: break;
	}
}

void
game_audio_callback(void* userdata, uint8_t* stream, int len)
{
	(void)userdata; (void)stream; (void)len;

	fill_audio_buffer(stream, len);
}