#include "util.h"

#include <tice.h>

void set_time(const struct tm *time) {
    boot_SetDate(time->tm_mday, time->tm_mon, time->tm_year + 1900);
    boot_SetTime(time->tm_sec, time->tm_min, time->tm_hour);
}

#define CLOCKFLAGS 0x3F
#define IS24HOUR 2

bool is_clock_24h(void) {
    uint8_t *flags = (void*)0xD00080;
    return !!(flags[CLOCKFLAGS] & (1 << IS24HOUR));
}

int mod(int a, int b) {
    int r = a % b;
    return r < 0 ? r + b : r;
}

uint8_t get_exact_day(const struct month_relative_day *mrday, uint8_t month, uint24_t year) {
	if(mrday->is_exact_day) {
		return mrday->exact_day;
	} else {
		struct tm tm = {.tm_mday = 1, .tm_mon = month, .tm_year = year};
		time_t t = mktime(&tm);
		uint8_t weekday = localtime(&t)->tm_wday;
		return 1 + mod(mrday->weekday - weekday, 7) + 7 * (mrday->weeknum - 1);
	}
}

long lmax(long a, long b) {
	if(a > b) return a;
	else return b;
}