#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;
}