#include "log.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <time.h>

void log_init(void) {
    setvbuf(stdout, NULL, _IOLBF, 0);
}

static void ts(char *out, size_t out_sz) {
    time_t now = time(NULL);
    struct tm tm;
    localtime_r(&now, &tm);
    strftime(out, out_sz, "%Y-%m-%d %H:%M:%S", &tm);
}

static void vlog(FILE *f, const char *level, const char *fmt, va_list ap) {
    char t[32];
    ts(t, sizeof(t));
    fprintf(f, "%s %s: ", t, level);
    vfprintf(f, fmt, ap);
    fputc('\n', f);
    fflush(f);
}

void log_info(const char *fmt, ...) {
    va_list ap; va_start(ap, fmt);
    vlog(stdout, "INFO", fmt, ap);
    va_end(ap);
}
void log_warn(const char *fmt, ...) {
    va_list ap; va_start(ap, fmt);
    vlog(stderr, "WARN", fmt, ap);
    va_end(ap);
}
void log_error(const char *fmt, ...) {
    va_list ap; va_start(ap, fmt);
    vlog(stderr, "ERROR", fmt, ap);
    va_end(ap);
}