/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>

#include <glib.h>

#include <gdbus.h>

#include "plugin.h"
#include "adapter.h"
#include "log.h"

static gboolean session_event(GIOChannel *chan,
					GIOCondition cond, gpointer data)
{
	unsigned char buf[672];
	gsize len, written;
	GIOError err;

	if (cond & (G_IO_HUP | G_IO_ERR | G_IO_NVAL))
		return FALSE;

	err = g_io_channel_read(chan, (gchar *) buf, sizeof(buf), &len);
	if (err == G_IO_ERROR_AGAIN)
		return TRUE;

	g_io_channel_write(chan, (const gchar *) buf, len, &written);

	return TRUE;
}

static gboolean connect_event(GIOChannel *chan,
					GIOCondition cond, gpointer data)
{
	GIOChannel *io;
	struct sockaddr_rc addr;
	socklen_t optlen;
	char address[18];
	int sk, nsk;

	sk = g_io_channel_unix_get_fd(chan);

	memset(&addr, 0, sizeof(addr));
	optlen = sizeof(addr);

	nsk = accept(sk, (struct sockaddr *) &addr, &optlen);
	if (nsk < 0)
		return TRUE;

	io = g_io_channel_unix_new(nsk);
	g_io_channel_set_close_on_unref(io, TRUE);

	ba2str(&addr.rc_bdaddr, address);

	g_io_add_watch(io, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
							session_event, NULL);

	return TRUE;
}

static GIOChannel *setup_rfcomm(uint8_t channel)
{
	GIOChannel *io;
	struct sockaddr_rc addr;
	int sk;

	sk = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
	if (sk < 0)
		return NULL;

	memset(&addr, 0, sizeof(addr));
	addr.rc_family = AF_BLUETOOTH;
	bacpy(&addr.rc_bdaddr, BDADDR_ANY);
	addr.rc_channel = channel;

	if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		close(sk);
		return NULL;
	}

	if (listen(sk, 10) < 0) {
		close(sk);
		return NULL;
	}

	io = g_io_channel_unix_new(sk);
	g_io_channel_set_close_on_unref(io, TRUE);

	g_io_add_watch(io, G_IO_IN, connect_event, NULL);

	return io;
}

static GIOChannel *chan = NULL;

static int echo_probe(struct btd_adapter *adapter)
{
	const char *path = adapter_get_path(adapter);

	DBG("path %s", path);

	chan = setup_rfcomm(23);

	return 0;
}

static void echo_remove(struct btd_adapter *adapter)
{
	const char *path = adapter_get_path(adapter);

	DBG("path %s", path);

	g_io_channel_unref(chan);
}

static struct btd_adapter_driver echo_server = {
	.name	= "echo-server",
	.probe	= echo_probe,
	.remove	= echo_remove,
};

static int echo_init(void)
{
	DBG("Setup echo plugin");

	return btd_register_adapter_driver(&echo_server);
}

static void echo_exit(void)
{
	DBG("Cleanup echo plugin");

	btd_unregister_adapter_driver(&echo_server);
}

BLUETOOTH_PLUGIN_DEFINE(echo, VERSION,
		BLUETOOTH_PLUGIN_PRIORITY_DEFAULT, echo_init, echo_exit)