#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <tice.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "main.h"
#include "detect.h"


#define MENU_ROWS_COUNT 10

uint8_t menu(void) {
	uint8_t index_selected = 0;
	uint8_t index_first    = 0;
	uint8_t index_pastlast;
	uint8_t index_count    = detected_levels_count;

	uint8_t i, y, key_pressed;


	for (;;) {
		os_ClrHome();

		asm("\tSET 3, (iy + 5)\n"); /* 5 == TextFlags, 3 == TextInverse */
		print_text(0, y = 0, "      BOULDASH  v1.0      ");
		print_text(0, (MENU_ROWS_COUNT-1), "  Made by Nathan MESNARD  ");
		asm("\tRES 3, (iy + 5)\n"); /* 5 == TextFlags, 3 == TextInverse */

		index_pastlast = index_first + (MENU_ROWS_COUNT-2);
		if (index_pastlast > index_count) index_pastlast = index_count;

		for (i = index_first; i < index_pastlast; ++i) {
			detect_level_description(i);
			print_text(1, ++y, &detected_level_description[0]);
		}

		for (;;) {
			print_text(0, index_selected - index_first + 1, "\xDF"); /* => */

			while (!(key_pressed = os_GetCSC()));

			print_text(0, index_selected - index_first + 1, " ");

			if (key_pressed == sk_Down) {
				if (index_selected+1 < index_count) {
					if (++index_selected == index_pastlast) {
						index_first = index_selected;
						break;
					}
				}
			} else if (key_pressed == sk_Up) {
				if (index_selected) {
					if (--index_selected < index_first) {
						index_first -= (MENU_ROWS_COUNT-2);
						break;
					}
				}
			} else if (key_pressed == sk_Enter) {
confirm:			return index_selected;
			} else if (key_pressed == sk_Clear) {
cancel:				return 255;
			}
		}
	}
}