/***************************************************************************
 *   Copyright (C) 03/2009 by Olaf Rempel                                  *
 *   razzor@kopf-tisch.de                                                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; version 2 of the License                *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <getopt.h>
#include <signal.h>

#include "configfile.h"
#include "event.h"
#include "logging.h"
#include "pidfile.h"
#include "signals.h"
#include "usvdevice.h"
#include "usvstate.h"

#define DEFAULT_CONFIG "alix-usvd.conf"
#define DEFAULT_LOGFILE "alix-usvd.log"
#define DEFAULT_PIDFILE "alix-usvd.pid"

static struct option opts[] = {
	{"nofork",	0, 0, 'd'},
	{"config",	1, 0, 'c'},
	{"help",	0, 0, 'h'},
	{0, 0, 0, 0}
};

int main(int argc, char *argv[])
{
	char *config = DEFAULT_CONFIG;
	int debug = 0;

	int code, arg = 0;
	do {
		code = getopt_long(argc, argv, "dc:h", opts, &arg);
		switch (code) {
		case 'd': /* debug */
			debug = 1;
			break;

		case 'c': /* configfile path */
			config = optarg;
			break;

		case 'h': /* help */
			printf( "Usage: alix-usvd [-d] [-c config]\n"
				"Options: \n"
				"  --debug        -d              do not fork and log to stderr\n"
				"  --config       -c  configfile  use this configfile\n"
				"  --help         -h              this help\n"
				"\n");
			exit(0);
			break;

		case '?': /* error */
			exit(1);
			break;

		default: /* unknown / all options parsed */
			break;
		}
	} while (code != -1);

	/* parse config file */
	if (config_parse(config) < 0)
		exit(1);

	if (!debug) {
		/* check pidfile */
		const char *pidfile = config_get_string("global", "pidfile", DEFAULT_PIDFILE);
		if (pidfile_check(pidfile, 1) != 0) {
			log_print(LOG_ERROR, "alix-usvd already running");
			exit(1);
		}

		/* start logging */
		const char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
		if (log_init(logfile) < 0)
			exit(1);

		/* zum daemon mutieren */
		daemon(-1, 0);

		/* create pidfile */
		if (pidfile_create(pidfile) < 0) {
			log_print(LOG_ERROR, "failed to create pidfile %s", pidfile);
			exit(1);
		}
	}

	log_print(LOG_INFO, "alix-usvd started (pid: %d)", getpid());

	signal_init();
	signal_set_callback(SIGHUP, event_loop_break);

	while (1) {
		if (usvdev_init() < 0)
			break;

		if (usvstate_init() < 0)
			break;

		event_loop();

		usvstate_close();

		log_close();

		config_free();

		if (config_parse(config) < 0)
			break;

		const char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
		if (!debug && log_init(logfile) < 0)
			break;

		log_print(LOG_INFO, "alix-usvd restarted (pid: %d)", getpid());
	}

	return 0;
}