/**
 * @file BLog_syslog.c
 * @author Ambroz Bizjak <ambrop7@gmail.com>
 * 
 * @section LICENSE
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

#include <misc/debug.h>

#include "BLog_syslog.h"

static int resolve_facility (char *str, int *out)
{
    if (!strcmp(str, "authpriv")) {
        *out = LOG_AUTHPRIV;
    }
    else if (!strcmp(str, "cron")) {
        *out = LOG_CRON;
    }
    else if (!strcmp(str, "daemon")) {
        *out = LOG_DAEMON;
    }
    else if (!strcmp(str, "ftp")) {
        *out = LOG_FTP;
    }
    else if (!strcmp(str, "local0")) {
        *out = LOG_LOCAL0;
    }
    else if (!strcmp(str, "local1")) {
        *out = LOG_LOCAL1;
    }
    else if (!strcmp(str, "local2")) {
        *out = LOG_LOCAL2;
    }
    else if (!strcmp(str, "local3")) {
        *out = LOG_LOCAL3;
    }
    else if (!strcmp(str, "local4")) {
        *out = LOG_LOCAL4;
    }
    else if (!strcmp(str, "local5")) {
        *out = LOG_LOCAL5;
    }
    else if (!strcmp(str, "local6")) {
        *out = LOG_LOCAL6;
    }
    else if (!strcmp(str, "local7")) {
        *out = LOG_LOCAL7;
    }
    else if (!strcmp(str, "lpr")) {
        *out = LOG_LPR;
    }
    else if (!strcmp(str, "mail")) {
        *out = LOG_MAIL;
    }
    else if (!strcmp(str, "news")) {
        *out = LOG_NEWS;
    }
    else if (!strcmp(str, "syslog")) {
        *out = LOG_SYSLOG;
    }
    else if (!strcmp(str, "user")) {
        *out = LOG_USER;
    }
    else if (!strcmp(str, "uucp")) {
        *out = LOG_UUCP;
    }
    else {
        return 0;
    }
    
    return 1;
}

static int convert_level (int level)
{
    ASSERT(level >= BLOG_ERROR && level <= BLOG_DEBUG)
    
    switch (level) {
        case BLOG_ERROR:
            return LOG_ERR;
        case BLOG_WARNING:
            return LOG_WARNING;
        case BLOG_NOTICE:
            return LOG_NOTICE;
        case BLOG_INFO:
            return LOG_INFO;
        case BLOG_DEBUG:
            return LOG_DEBUG;
        default:
            ASSERT(0)
            return 0;
    }
}

static struct {
    char ident[200];
} syslog_global;

static void syslog_log (int channel, int level, const char *msg)
{
    syslog(convert_level(level), "%s: %s", blog_global.channels[channel].name, msg);
}

static void syslog_free (void)
{
    closelog();
}

int BLog_InitSyslog (char *ident, char *facility_str)
{
    int facility;
    if (!resolve_facility(facility_str, &facility)) {
        return 0;
    }
    
    snprintf(syslog_global.ident, sizeof(syslog_global.ident), "%s", ident);
    
    openlog(syslog_global.ident, 0, facility);
    
    BLog_Init(syslog_log, syslog_free);
    
    return 1;
}