/* * 
 * This file is part of bufferpool
 *
 * Copyright (C) 2007 by LScube team <team@streaming.polito.it>
 * See AUTHORS for more details
 * 
 * bufferpool is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * bufferpool is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with bufferpool; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 
 *
 * */

#include <stdio.h>
#include <time.h>
#include <string.h>
#include <syslog.h>
#include <stdarg.h>
#include <bufferpool.h>

#define LOG_FORMAT "%d/%b/%Y:%H:%M:%S %z"
#define ERR_FORMAT "%a %b %d %H:%M:%S %Y"
#define MAX_LEN_DATE 30

static int envlevel = 1;

/*Prints on standard error or file*/
static void bufferpool_errlog(int level, const char *fmt, va_list args)
{
    time_t now;
    char date[MAX_LEN_DATE];
    const struct tm *tm;

    if (level > envlevel) return;

    time(&now);
    tm = localtime(&now);

    switch (level) {
        case FNC_LOG_FATAL:
            strftime(date, MAX_LEN_DATE, ERR_FORMAT, tm);
            fprintf(stderr, "[%s] [fatal error] ", date);
            break;
        case FNC_LOG_ERR:
            strftime(date, MAX_LEN_DATE, ERR_FORMAT, tm);
            fprintf(stderr, "[%s] [error] ", date);
            break;
        case FNC_LOG_DEBUG:
            fprintf(stderr, "[debug] ");
            break;
        default:
            /*FNC_LOG_INFO*/
            strftime(date, MAX_LEN_DATE, LOG_FORMAT ,tm);
            fprintf(stderr, "[%s] ", date);
            break;
    }

    vfprintf(stderr, fmt, args);
    fprintf(stderr, "\n");
}

static void (*bp_vlog)(int, const char*, va_list) = bufferpool_errlog;

/**
 * Set the logger to the current function
 * @param fn logger function
 **/
void bp_log_init(bp_log_t fn)
{
    if (fn)
        bp_vlog = fn;
}

/**
 * External logger function
 * @param level log level
 * @param fmt as printf format string
 * @param ... as printf variable argument
 */
void bp_log(int level, const char *fmt, ...) {
    va_list vl;
    va_start(vl, fmt);
    bp_vlog(level, fmt, vl);
    va_end(vl);
}