#include "conf.h"
#include "input.h"
#include "level.h"
#include "player.h"
#include <gint/cpu.h>
#include <gint/display.h>
#include <gint/timer.h>

static struct Player player;
static int timer;
static volatile int has_ticked;

static void init(void);
static void deinit(void);
static void draw(void);
static void update(void);
static int timer_callback(volatile int *);

int
main(void)
{
	int frameskip = 1;

	init();
	level_load(0);

	do {
		int i;
		draw();
		for (i = 0; i < frameskip; i++) {
			if (has_ticked > frameskip) frameskip = has_ticked;
			while (!has_ticked)
				sleep();
			while (has_ticked)
				has_ticked = 0;
			update();
		}
	} while (input_up(K_EXIT));

	deinit();
	return 0;
}

static void
init(void)
{
	extern font_t font_dina;
	dfont(&font_dina);

	timer = timer_configure(TIMER_ANY, 1000000 / TARGET_FPS,
	                        GINT_CALL(timer_callback, &has_ticked));
	timer_start(timer);

	input_init();
	level_init(&player);
}

static void
deinit(void)
{
	level_deinit();

	timer_stop(timer);
}

static void
update(void)
{
	input_update();
	player_update(&player);
}

static void
draw(void)
{
	dclear(C_BLACK);
	level_draw();
	player_draw(&player);
	dupdate();
}

static int
timer_callback(volatile int *arg)
{
	*arg += 1;
	return 0;
}