/*
 * Copyright (c) 2000 - 2016 Samsung Electronics Co., Ltd. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/timerfd.h>
#include <glib.h>

#include "alarm.h"
#include "alarm-internal.h"

extern bool g_dummy_timer_is_set;

bool _alarm_destory_timer(timer_t timer)
{
	if (timer_delete(timer) == 0)
		return true;
	else
		return false;
}

bool _alarm_disable_timer(__alarm_server_context_t alarm_context)
{
	struct itimerspec time_spec;

	time_spec.it_value.tv_sec = 0;
	time_spec.it_value.tv_nsec = 0;
	time_spec.it_interval.tv_sec = time_spec.it_interval.tv_nsec = 0;

	if (timerfd_settime(alarm_context.timer, 0, &time_spec, NULL) < 0) {
		perror("disable timer has failed\n");
		return false;
	}

	return true;
}

bool _alarm_set_timer(__alarm_server_context_t *alarm_context, int timer, time_t due_time)
{
	struct itimerspec time_spec;
	time_t current_time;
	double interval;
	char due_time_r[100] = { 0 };
	struct tm ts_ret;
	extern int errno;

	time(&current_time);

	interval = difftime(due_time, current_time);
	ALARM_MGR_LOG_PRINT("[alarm-server][timer]: remain time from current is %f , due_time is %d.", interval, due_time);

	/*set timer as absolute time */
	/*we create dummy timer when the interval is longer than one day. */
	/*the timer will be expired in half day. */

	localtime_r(&due_time, &ts_ret);

	if (interval > 60 * 60 * 24) {
		interval = 60 * 60 * 12;
		g_dummy_timer_is_set = true;
		strftime(due_time_r, 30, "%c", &ts_ret);
		ALARM_MGR_LOG_PRINT("create dummy alarm timer(%d), due_time(%s)", timer, due_time_r);
	} else {
		g_dummy_timer_is_set = false;
	}

	time_spec.it_value.tv_sec = due_time;
	time_spec.it_value.tv_nsec = 0;
	time_spec.it_interval.tv_sec = time_spec.it_interval.tv_nsec = 0;

	if (interval > 0 && timerfd_settime(timer, TFD_TIMER_ABSTIME, &time_spec, NULL) != 0) {
		ALARM_MGR_EXCEPTION_PRINT("set timer has failed : timer(%d), due_time(%u) , errno(%d).", timer, due_time, errno);
		return false;
	}
	/* we set c_due_time to due_time due to allow newly created alarm can
	   be schedlued when its interval is less than the current alarm */
	alarm_context->c_due_time = due_time;
	return true;
}