/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2007, Redfish Solutions
 *
 * Philip Prindeville <philipp@redfish-solutions.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Sleep until the given epoch
 * 
 * \ingroup applications
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 0 $")

#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/options.h"

static char *tdesc = "Generic WaitUntil() application";

static char *app = "WaitUntil";

static char *synopsis = "Wait (sleep) until the current time is the given epoch";

static char *descrip =
"  WaitUntil(epoch): Waits until the current time is that given. Returns\n"
"immediately if the epoch is in the past.\n";

STANDARD_LOCAL_USER;

LOCAL_USER_DECL;

static int waituntil_exec(struct ast_channel *chan, void *data)
{
	int res = 0;
	struct localuser *u;
	time_t future;
	struct timeval tv;
	ulong msec;

	if (ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "WaitUntil requires an argument(epoch)\n");
		return -1;
	}

	LOCAL_USER_ADD(u);

        if (sscanf(data, "%lu", &future) != 1) {
		ast_log(LOG_WARNING, "WaitUntil called with non-numeric argument\n");
		LOCAL_USER_REMOVE(u);
		return -1;
	}

	/*
	 * Get the current time, and calculate the number of milliseconds
	 * until then (rounding up from microseconds).
	 */
	gettimeofday(&tv, NULL);

        if (future <= tv.tv_sec) {
		ast_log(LOG_NOTICE, "WaitUntil called in the past (now %lu, arg %lu)\n", tv.tv_sec, future);
		LOCAL_USER_REMOVE(u);
		return 0;
	}

	msec = (future - tv.tv_sec) * 1000 - ((tv.tv_usec + 500) / 1000);

	res = ast_safe_sleep(chan, msec);

	LOCAL_USER_REMOVE(u);

	return res;
}

int unload_module(void)
{
	int res;

	res = ast_unregister_application(app);

	STANDARD_HANGUP_LOCALUSERS;

	return res;
}

int load_module(void)
{
	int res;

	res = ast_register_application(app, waituntil_exec, synopsis, descrip);

	return res;
}

char *description(void)
{
	return tdesc;
}

int usecount(void)
{
	int res;
	STANDARD_USECOUNT(res);
	return res;
}

char *key()
{
	return ASTERISK_GPL_KEY;
}