/**
 * \file
 *
 * \author	Georg Hopp
 *
 * \copyright
 * Copyright © 2014 Georg Hopp
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <stdarg.h>
#include <stdint.h>

#include <sys/types.h>

#include "trbase.h"
#include "trio.h"
#include "trdata.h"

#include "tr/datagram_service.h"
#include "tr/interface/protocol.h"
#include "tr/interface/comm_end_point.h"

static
int
datagramServiceCtor(void * _this, va_list * params)
{
	TR_PARENTCALL(TR_DatagramService, _this, TR_Class, ctor, params);

	return 0;
}

static
void
datagramServiceDtor(void * _this)
{
	TR_PARENTCALL(TR_DatagramService, _this, TR_Class, dtor);
}

static
TR_ProtoMessage
datagramServiceNextMessage(void * _this, TR_RemoteData * data)
{
	TR_CommEndPoint comm        = _this;
	TR_ProtoMessage ret_message = NULL;

	if (*data) {
		ret_message = TR_protoCreateMessage(comm->protocol, (*data)->remote);
		TR_protoParse(comm->protocol, ret_message, *data);

		/*
		 * In UDP I don't care about remaining data. UDP is an all or nothing
		 * approach. If the parser is unable to create a message from the data I
		 * drop the data.
		 * Here the protocol must not free the data if it does not create a
		 * complete message from it. If a message was created the original data
		 * might or might not traval with the created message. In any case the
		 * protocol is then responsible for freeing the data.
		 */

		if (! ret_message->ready) {
			TR_delete(*data);
			TR_delete(ret_message);
		}

		*data = NULL;
	}

	return ret_message;
}

static
int
datagramServiceCompose(void * _this, TR_ProtoMessage message)
{
	TR_RemoteData data =
		TR_protoCompose(((TR_CommEndPoint)_this)->protocol, message);

	if (! data) {
		return FALSE;
	}

	TR_queuePut(((TR_CommEndPoint)_this)->write_buffer, data);
	return ((TR_SizedData)data)->size;
}

intptr_t datagramService_events[TR_CEP_EVENT_MAX + 1];
TR_INIT_IFACE(TR_Class, datagramServiceCtor, datagramServiceDtor, NULL);
TR_INIT_IFACE(
		TR_CommEndPoint,
		datagramServiceNextMessage,
		datagramServiceCompose);
TR_CREATE_CLASS(
		TR_DatagramService,
		TR_CommEndPoint,
		NULL,
		TR_IF(TR_Class),
		TR_IF(TR_CommEndPoint)) = {
	{{
		 NULL,
		 TR_CEP_EVENT_MAX + 1,
		 datagramService_events
	}}
};

// vim: set ts=4 sw=4: