/*
 * Copyright (C) 2015, 2016 "IoT.bzh"
 * Author José Bollo <jose.bollo@iot.bzh>
 *
 * 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.
 */

#define _GNU_SOURCE

#include <errno.h>
#include <systemd/sd-event.h>
#include <systemd/sd-bus.h>

#include "afb-common.h"

/*
struct sd_event *afb_common_get_thread_event_loop()
{
	sd_event *result;
	int rc = sd_event_default(&result);
	if (rc != 0) {
		errno = -rc;
		result = NULL;
	}
	return result;
}
*/

static void *sdopen(void **p, int (*f)(void **))
{
	if (*p == NULL) {
		int rc = f(p);
		if (rc < 0) {
			errno = -rc;
			*p = NULL;
		}
	}
	return *p;
}

static struct sd_bus *sdbusopen(struct sd_bus **p, int (*f)(struct sd_bus **))
{
	if (*p == NULL) {
		int rc = f(p);
		if (rc < 0) {
			errno = -rc;
			*p = NULL;
		} else {
			rc = sd_bus_attach_event(*p, afb_common_get_event_loop(), 0);
			if (rc < 0) {
				sd_bus_unref(*p);
				errno = -rc;
				*p = NULL;
			}
		}
	}
	return *p;
}

struct sd_event *afb_common_get_event_loop()
{
	static struct sd_event *result = NULL;
	return sdopen((void*)&result, (void*)sd_event_new);
}

struct sd_bus *afb_common_get_user_bus()
{
	static struct sd_bus *result = NULL;
	return sdbusopen((void*)&result, (void*)sd_bus_open_user);
}

struct sd_bus *afb_common_get_system_bus()
{
	static struct sd_bus *result = NULL;
	return sdbusopen((void*)&result, (void*)sd_bus_open_system);
}