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

#include <data.h>
#include <duktape_engine.h>

#define LENGTH(arr) (sizeof(arr) / sizeof(arr[0]))

static bool launcher_running = true;
static bool running = false;
static GRRLIB_ttfFont * font;
static unsigned int green = RGBA(0, 255, 0, 255); 
static unsigned int white = RGBA(255, 255, 255, 255); 

struct menu_item {
	const char * message;
	void (*entrypoint)();
};

struct menu_items {
	size_t selected_index;	
	struct menu_item * items[2];
};

static struct menu_items items = {
	.selected_index = 0,
	.items = {}
};

static struct menu_item * create_menu_item(const char * message, void (*entrypoint)()) {
	struct menu_item * item = malloc(sizeof(struct menu_item));
	item->message = message;
	item->entrypoint = entrypoint;
	return item;
}

static void start_duktape() {
	running = true;
	duktape(font, &running);	
}

static void start_quickjs() {
	running = true;
	while (running) {
		PAD_ScanPads();
		unsigned int pressed = PAD_ButtonsDown(0);
		GRRLIB_PrintfTTF(0, 0, font, "QuickJS is not implemented, yet..", 48, RGBA(255, 255, 255, 255));
		GRRLIB_Render();
		if (pressed & PAD_BUTTON_START) {
			running = false;
		}
	}
}

static void update_menu(unsigned int * pressed) {
	if (*pressed & PAD_BUTTON_DOWN) {
		int selected_index = items.selected_index;
		selected_index += 1;
		if (selected_index >= LENGTH(items.items)) {
			selected_index = 0;
		}
		items.selected_index = selected_index;
	} else if (*pressed & PAD_BUTTON_UP) {
		int selected_index = items.selected_index;
		selected_index -= 1;
		if (selected_index < 0) {
			selected_index = LENGTH(items.items) - 1;
		}
		items.selected_index = selected_index;
	}

	if (*pressed & PAD_BUTTON_A) {
		items.items[items.selected_index]->entrypoint();
	}

	for (size_t i = 0; i < LENGTH(items.items); i++) {
		unsigned int color;
		if (items.selected_index == i) {
			color = green;
		} else {
			color = white;
		}
		GRRLIB_PrintfTTF(0, 80 + (50 * i), font, items.items[i]->message, 64, color);
	}
}

static void launcher_loop() {
	while (launcher_running) {
		PAD_ScanPads();
		unsigned int pressed = PAD_ButtonsDown(0);
		if (pressed & PAD_BUTTON_START) {
			launcher_running = false;
			return;
		}
		GRRLIB_PrintfTTF(0, 0, font, "WiiDuktape Launcher", 64, RGBA(255, 255, 255, 255));
		update_menu(&pressed);
		GRRLIB_Render();
	}
}

int main(int argc, char **argv) {
	GRRLIB_SetAntiAliasing(false);
	GRRLIB_Init();
	PAD_Init();

	// get the pixel operator font's data pointer and size
	void * pixel_operator_font;
	size_t pixel_operator_font_size;
	get_file_pointer("PixelOperator.ttf", &pixel_operator_font, &pixel_operator_font_size);

	font = GRRLIB_LoadTTF(pixel_operator_font, pixel_operator_font_size);

	items.items[0] = create_menu_item("Duktape", start_duktape);
	items.items[1] = create_menu_item("QuickJS", start_quickjs);

	launcher_loop();

	for (size_t i = 0; i < LENGTH(items.items); i++) {
		// clear out heap allocated memory.
		free(items.items[i]);
	}

	GRRLIB_Exit();

	return 0;
}