#include <grrlib.h>
#include <duktape.h>
#include <stdio.h>
#include <stdlib.h>
#include <ogc/lwp_watchdog.h>

#include <data.h>
#include <wii_duk.h>
#include <game.h>

const float MICROSECOND = 0.000001f;

static float deltatime = 1.0f/60;
static unsigned int green = RGBA(0, 255, 0, 255); 
static GRRLIB_ttfFont * font;

static void duk_fatal_error(void *udata, const char *msg) {
	const char * err_message_format = "an error has occured: %s";
	size_t message_size = strlen(err_message_format) + strlen(msg) * sizeof(char *);
	char * message = malloc(message_size);
	snprintf(message, message_size, err_message_format, msg);
	while (1) {
		GRRLIB_PrintfTTF(0, 0, font, message, 12, green);
		GRRLIB_Render();
	}
}

void duktape(GRRLIB_ttfFont * global_font, bool * running) {
	font = global_font;	
	duk_context * ctx = duk_create_heap(NULL, NULL, NULL, NULL, duk_fatal_error);

	// create a wii object on the global object (globalThis)
	define_wii_object(ctx, font, running, &deltatime);
	duk_put_global_string(ctx, "wii");

	// evaluate functions from game.js
	duk_eval_string_noresult(ctx, program);

	// call start function
	duk_get_global_string(ctx, "start");
	duk_call(ctx, 0);
	duk_pop(ctx);

	while (*running) {
		const unsigned int beginningOfFrame = ticks_to_microsecs(gettime());

		PAD_ScanPads();

		// call update function
		duk_get_global_string(ctx, "update");
		duk_call(ctx, 0);
		duk_pop(ctx);

		GRRLIB_Render();

		const unsigned int endOfFrame = ticks_to_microsecs(gettime());
		deltatime = (endOfFrame - beginningOfFrame) * MICROSECOND;
	}
}