/*!
 * UbusCall.cpp
 *
 * Copyright (c) 2015, NADAL Jean-Baptiste. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 * 
 * @Author:  NADAL Jean-Baptiste
 * @Date: 21/03/2015
 *
 */

/*-------------------------------- INCLUDES ---------------------------------*/

extern "C" {
#include <libubus.h>
#include <libubox/blobmsg_json.h>	
}

#include "common.h"

#include "ubuscpp/UBusCall.h"

#define kDefaultTimeoutInSecond		5

static void receive_call_result_data (struct ubus_request *aReq, int aType, struct blob_attr *aMsg);


/*!  ----------------------------------------------------------------------------
 *  @fn UBusCall
 *
 *  @brief Constructor of the UBus Handler.
 */
UBusCall::UBusCall (void):
mTimeout (kDefaultTimeoutInSecond)
{
}

/*!  ----------------------------------------------------------------------------
 *  @fn Exec
 *
 *  @brief execute a.
 */
int UBusCall::Exec (const std::string &aPath, const std::string &aMethod, 
				    const std::string &aParameter, std::string &aResult)
{
	int theRet = 0;	
	uint32_t theId;
	
	struct blob_buf theBuf = {0};
	struct ubus_context *theCtx = ubus_connect (NULL);
	
	if (theCtx == NULL) {
		
		fprintf (stderr, "%s - Failed to create an ubus context.\n", __PRETTY_FUNCTION__);
		return -1;
	}
	
	blob_buf_init (&theBuf, 0);
	
	if (!aParameter.empty()) {

		if (!blobmsg_add_json_from_string (&theBuf, aParameter.c_str())) {
			
			fprintf (stderr, "%s - Failed to parse message data\n", __PRETTY_FUNCTION__);
			return -1;
		}
	}
	
	theRet = ubus_lookup_id (theCtx, aPath.c_str(), &theId);
	if (theRet) {
		
		fprintf (stderr, "%s - ubus_lookup_id error = '%d'\n", __PRETTY_FUNCTION__, theRet);
		ubus_free (theCtx);
		blob_buf_free (&theBuf);
		return theRet;
	}
	
	theRet = ubus_invoke (theCtx, theId, aMethod.c_str(), theBuf.head, receive_call_result_data, this, mTimeout * 1000);
	
	ubus_free (theCtx);
	blob_buf_free (&theBuf);
	
	if (!mData.empty()) {

		aResult = mData;
	}

	return theRet;
}


/*!  ----------------------------------------------------------------------------
 *  @fn SetResult
 *
 *  @brief Save the Result received by UBus.
 */
int UBusCall::SetResult (const std::string &aResult)
{
	mData = aResult;
	return 0;
}


/*!  ----------------------------------------------------------------------------
 *  @fn receive_call_result_data
 *
 *  @brief UBus received call back.
 */
static void receive_call_result_data (struct ubus_request *aReq, int aType, struct blob_attr *aMsg)
{
	UNUSED_PARAMETER (aType);
	char *theStr;
	UBusCall *anUBusObject = static_cast<UBusCall*>(aReq->priv);
	theStr = blobmsg_format_json (aMsg, true);
	
	anUBusObject->SetResult (std::string (theStr));
	
	free (theStr);
}