#include <stdio.h>
#include <time.h>

#include <hexagram/clock.h>

static ssize_t format_text(hexagram_text *text, char *buf, size_t len) {
    hexagram_clock *clock = (hexagram_clock *)text;
    switch (clock->format) {
        case HEXAGRAM_CLOCK_24H:
            return snprintf(buf, len, "%d:%02d",
                            clock->time.hour, clock->time.minute);

        case HEXAGRAM_CLOCK_12H:
            return snprintf(buf, len, "%d:%02d %s",
                            clock->time.hour, clock->time.minute,
                            clock->time.hour < 12? "am": "pm");
    }

    return 0;
}

int hexagram_clock_init(hexagram_clock *clock,
                        double x,
                        double y,
                        hexagram_text_align align,
                        hexagram_clock_format format) {
    if (hexagram_text_init(&clock->text,
                           x,
                           y,
                           align,
                           format_text) < 0) {
        goto error_text_init;
    }

    clock->format      = format;
    clock->time.hour   = 0;
    clock->time.minute = 0;

    return 0;

error_text_init:
    return -1;
}

void hexagram_clock_set(hexagram_clock *clock, time_t now) {
    struct tm *now_tm;

    if ((now_tm = localtime(&now)) == NULL) {
        return;
    }

    clock->time.hour   = now_tm->tm_hour;
    clock->time.minute = now_tm->tm_min;
}