/*
 *
 * Copyright 2023 Oleg Borodin  <borodin@unix7.org>
 *
 */

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

#define _CLOCK_SOURCE CLOCK_MONOTONIC
//#define CLOCK_SOURCE CLOCK_REALTIME_PRECISE

#define MAX_TS_LEN 256

void static set_timestamp(char* buffer) {
    time_t now = time(NULL);
    if (now < 0) {
        return;
    }
    struct tm* ptm = localtime(&now);
    if (ptm == NULL) {
        return;
    }
    struct timespec tv;

    clock_gettime(_CLOCK_SOURCE, &tv);
    memset(buffer, '\0', MAX_TS_LEN);
    sprintf(buffer, "%04d-%02d-%02dT%02d:%02d:%02d.%ld+%s",
            ptm->tm_year + 1900, ptm->tm_mon + 1, ptm->tm_mday, ptm->tm_hour,
            ptm->tm_min, ptm->tm_sec, tv.tv_nsec, ptm->tm_zone);
}

void log_error(const char* format, ...) {

    char timestamp[MAX_TS_LEN];
    set_timestamp(timestamp);

    va_list args;
    fprintf(stderr, "%s error: ", timestamp);
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    fprintf(stderr, "\n");
}

void log_debug(const char* format, ...) {

    char timestamp[MAX_TS_LEN];
    set_timestamp(timestamp);

    va_list args;
    fprintf(stderr, "%s debug: ", timestamp);
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    fprintf(stderr, "\n");
}