// vim:ts=4:sw=4:expandtab
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>

#include "i3status.h"

static bool local_timezone_init = false;
static const char *local_timezone = NULL;
static const char *current_timezone = NULL;

void set_timezone(const char *tz) {
    if (!local_timezone_init) {
        /* First call, initialize. */
        local_timezone = getenv("TZ");
        local_timezone_init = true;
    }
    if (tz == NULL || tz[0] == '\0') {
        /* User wants localtime. */
        tz = local_timezone;
    }
    if (tz != current_timezone) {
        if (tz) {
            setenv("TZ", tz, 1);
        } else {
            unsetenv("TZ");
        }
        tzset();
        current_timezone = tz;
    }
}

void print_time(yajl_gen json_gen, char *buffer, const char *format, const char *tz, time_t t) {
    char *outwalk = buffer;
    struct tm tm;

    /* Convert time and format output. */
    set_timezone(tz);
    localtime_r(&t, &tm);
    outwalk += strftime(outwalk, 4095, format, &tm);
    *outwalk = '\0';
    OUTPUT_FULL_TEXT(buffer);
}