/*
 * Copyright (c) 2004 Teodor Sigaev <teodor@sigaev.ru>
 * All rights reserved.
 *
 * 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 any co-contributors
 *        may be used to endorse or promote products derived from this software
 *        without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY 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 CONTRIBUTORS 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 <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <unistd.h>
#include <syslog.h>
#include <stdarg.h>

#include "tlog.h"

static FILE			*TL_ErrOut = NULL;
static u_int32_t	TL_DebugLevel = TL_INFO;
static u_int32_t	tlflag = TL_OPEN_STDERR | TL_OPEN_SYSLOG;


static int
TLtoSYS(int level) {
	level &= ~TL_EXIT;
	switch(level) {
		case	TL_CRIT : return LOG_CRIT;
		case	TL_ALARM: return LOG_ERR;
		case	TL_WARN : return LOG_WARNING;
		case	TL_INFO : return LOG_INFO;
		case	TL_DEBUG: return LOG_DEBUG;
		default: return LOG_WARNING;
	}
	return LOG_ERR;
}

void
opentlog(u_int32_t flag, u_int32_t level, char *file) {
	if (flag==0)
		flag=tlflag;

	TL_DebugLevel=level;

	tlflag &= ~TL_OPEN_FILE;
	if ( TL_ErrOut )
		fclose(TL_ErrOut);
	if ( (flag & TL_OPEN_FILE) && file ) {
		if ( (TL_ErrOut=fopen(file,"a")) == NULL )
			tlog(TL_ALARM,"Can't open log file '%s': %s", file, strerror(errno));
		else {
			u_int32_t oldflag = tlflag;
			tlflag = TL_OPEN_FILE;
			tlog(TL_INFO, "Log opened");
			tlflag = oldflag | TL_OPEN_FILE;
		}
	}

	tlflag &= ~TL_OPEN_SYSLOG;
	tlflag |= (flag & TL_OPEN_SYSLOG);

	tlflag &= ~TL_OPEN_STDERR;
	tlflag |= (flag & TL_OPEN_STDERR);
}

void
closetlog() {
	if ( TL_ErrOut ) {
		if ( tlflag & TL_OPEN_FILE ) {
			tlflag = TL_OPEN_FILE;
			tlog(TL_INFO,"Log closed");
		}
		fclose(TL_ErrOut);
	}
	TL_ErrOut=NULL;
	tlflag = TL_OPEN_STDERR | TL_OPEN_SYSLOG;
}

void
tlog(u_int32_t level,const char *format, ...) {
	va_list args;

	if ( (level & TL_EXIT)==0 )
		if ( (level & ~TL_EXIT) > TL_DebugLevel )
			return;

	if ( tlflag & (TL_OPEN_STDERR | TL_OPEN_FILE) ) {
		time_t t;
		char buf[64];
		t = time(NULL);

		strftime(buf,64,"%H:%M:%S %d/%m/%Y",localtime(&t));
		if ( tlflag & TL_OPEN_STDERR ) {
			fprintf( stderr,"%d %s ", getpid(), buf );
			va_start(args, format);
			vfprintf( stderr, format, args);
			va_end(args);
			fputc('\n', stderr);
		}
		if ( (tlflag & TL_OPEN_FILE) && TL_ErrOut ) {
			fprintf( TL_ErrOut,"%d %s ", getpid(), buf );
			va_start(args, format);
			vfprintf( TL_ErrOut, format, args);
			va_end(args);
			fputc('\n', TL_ErrOut);
			fflush(TL_ErrOut);
		}
	}

	if ( tlflag & TL_OPEN_SYSLOG ) {
		va_start(args, format);
		vsyslog( TLtoSYS(level),  format, args );
		va_end(args);
	}

	if ( level & TL_EXIT ) {
		tlog(level & ~TL_EXIT, "Exitting...");
		closetlog();
		exit(1);
	}
}