#define _GNU_SOURCE
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <inttypes.h>
#include <immintrin.h>
#include <unistd.h>

#ifdef _WIN32
	#define WIN32_LEAN_AND_MEAN
	#define NOMINMAX
	#undef NOCRYPT
	#include <windows.h>
	#include <mmsystem.h>
#elif defined(__linux__)
	#include <dlfcn.h>
	// #include <sched.h>
	// #include <unistd.h>
#endif

#include "settings.h"
#ifdef PROFILER
#define STB_SPRINTF_IMPLEMENTATION
#define STB_SPRINTF_NOFLOAT
#define STB_SPRINTF_STATIC
#include "stb_sprintf.h"
#define DEBUG_PRINT(format, ...) do { \
    char buf[512]; \
    int len = stbsp_snprintf(buf, sizeof(buf), format, ##__VA_ARGS__); \
    write(STDOUT_FILENO, buf, len); \
} while(0)
#else
#define DEBUG_PRINT(...)
#endif

#include "opengl_loader.c"

#include "incbin.h"
#include "ugg.h"
#include "state.c"
#include "common.h"


#include "opengl.c"
#include "render.c"
#include <mkfw/mkfw.c>

#ifdef PROFILER
#include "overlay.c"
#endif
#include "audio.c"
#include "callbacks.c"

/* [=]===^=[ main ]=================================================================^===[=] */
int main(int argc, char **argv) {
	state.toggle_crt_emulation = true;
	mkfw_init(320*5, 240*5);
	mkfw_set_swapinterval(0);
	mkfw_set_window_min_size_and_aspect(320*3, 240*3, 320, 240);
	mkfw_set_key_callback(key_callback);
	mkfw_set_mouse_move_delta_callback(mouse_move_callback);
	mkfw_set_mouse_button_callback(mouse_button_callback);
	mkfw_set_framebuffer_size_callback(framebuffer_callback);
	opengl_setup(vertex_shader_start, fragment_shader_start);
	change_resolution(SCREEN_WIDTH, SCREEN_HEIGHT);
	framebuffer_callback(SCREEN_WIDTH*3, SCREEN_HEIGHT*3);
#ifdef PROFILER
	overlay_init();
#endif
	init_callback();
	audio_initialize();

	set_decay(30);

	bool running = true;
	uint64_t next_update = mkfw_gettime() + FRAMETIME;
	while(running && !mkfw_should_close()) {
		mkfw_pump_messages();
		if(key_pressed(MKS_KEY_ESCAPE)) { running = false; }

#ifdef PROFILER
		reset_profiling_data();
#endif
		render_callback();
// #ifndef PERF_TEST
		apply_phosphor_decay();
// #endif
		update_keyboard_state();
		update_modifier_state();
		update_mouse_state();
		state.frame_number++;

#ifndef PERF_TEST
		render_frame();
#ifdef PROFILER
		debug_render();
#endif

		uint64_t now = mkfw_gettime();
		int64_t remaining = next_update - now;
		if(remaining > 0) {
			if(remaining > SLEEP_MARGIN_NS) {
				mkfw_sleep(remaining - SLEEP_MARGIN_NS);
			}
			while(mkfw_gettime() < next_update) { /**/ }
		} else {
			next_update = now;
		}
		next_update += FRAMETIME;

		mkfw_swap_buffers();
#endif
	}
	shutdown_callback();
#ifdef PROFILER
	overlay_shutdown();
#endif
	audio_shutdown();
	mkfw_cleanup();
	return 0;
}