/*-
 * Copyright (c) 2026, Mr. Goblin
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 *
 * 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 COPYRIGHT OWNER OR 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 <syslog.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "logger.h"

static int use_syslog = 0;

void
logger_init(const char *name, int daemon_flag)
{
	use_syslog = daemon_flag;
	if (use_syslog)
		openlog(name, LOG_PID, LOG_DAEMON);
}

void
logger_close(void)
{
	if (use_syslog)
		closelog();
}

void
logger_log(enum logger_lvl level, const char *format, ...)
{
	int saved_errno = errno;
	va_list vargs;
	va_start(vargs, format);
	if (use_syslog) {
		switch (level) {
		case log_lvl_info:
			vsyslog(LOG_INFO, format, vargs);
			break;
		case log_lvl_warning:
			vsyslog(LOG_WARNING, format, vargs);
			break;
		case log_lvl_err:
			vsyslog(LOG_ERR, format, vargs);
			break;
		}
	} else {
		FILE *f = NULL;
		switch (level) {
		case log_lvl_info:
			f = stdout;
			fprintf(f, "[INFO] ");
			break;
		case log_lvl_warning:
			f = stderr;
			fprintf(f, "[WARNING] ");
			break;
		case log_lvl_err:
			f = stderr;
			fprintf(f, "[ERROR] ");
			break;
		default:
			f = stderr;
			fprintf(f, "[UNKNOWN] ");
			break;
		}
		vfprintf(f, format, vargs);
	}
	errno = saved_errno;
}

void
logger_perror(const char *s)
{
	int saved_errno = errno;
	if (use_syslog) {
		syslog(LOG_ERR, "%s: %s\n", s, strerror(errno));
	} else {
		perror(s);
	}
	errno = saved_errno;
}