/*******************************************************************************
 * libretroshare/src/gxs: rsgxsdataaccess.cc                                   *
 *                                                                             *
 * libretroshare: retroshare core library                                      *
 *                                                                             *
 * Copyright 2012-2013 by Christopher Evi-Parker, Robert Fernie                *
 *                                                                             *
 * This program 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 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 Lesser General Public License for more details.                         *
 *                                                                             *
 * You should have received a copy of the GNU Lesser General Public License    *
 * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
 *                                                                             *
 *******************************************************************************/

#include "util/rstime.h"

#include "rsgxsutil.h"
#include "rsgxsdataaccess.h"
#include "retroshare/rsgxsflags.h"

/***********
 * #define DATA_DEBUG	1
 **********/

// Debug system to allow to print only for some services (group, Peer, etc)

#if defined(DATA_DEBUG)
static const uint32_t     service_to_print  = RS_SERVICE_GXS_TYPE_FORUMS;// use this to allow to this service id only, or 0 for all services
                                                                            // warning. Numbers should be SERVICE IDS (see serialiser/rsserviceids.h. E.g. 0x0215 for forums)

class nullstream: public std::ostream {};

static std::string nice_time_stamp(rstime_t now,rstime_t TS)
{
    if(TS == 0)
        return "Never" ;
    else
    {
        std::ostringstream s;
        s << now - TS << " secs ago" ;
        return s.str() ;
    }
}

static std::ostream& gxsdatadebug(uint32_t service_type)
{
    static nullstream null ;

    if (service_to_print==0 || service_type == 0 || (service_type == service_to_print))
        return std::cerr << time(NULL) << ":GXSDATASERVICE: " ;
    else
        return null ;
}

#define GXSDATADEBUG gxsdatadebug(mDataStore->serviceType())

static const std::vector<std::string> tokenStatusString( {
                                                                 std::string("FAILED"),
                                                                 std::string("PENDING"),
                                                                 std::string("PARTIAL"),
                                                                 std::string("COMPLETE"),
                                                                 std::string("DONE"),
                                                                 std::string("CANCELLED"),
                                                         });

#endif

bool operator<(const std::pair<uint32_t,GxsRequest*>& p1,const std::pair<uint32_t,GxsRequest*>& p2)
{
    return p1.second->Options.mPriority <= p2.second->Options.mPriority ;	// <= so that new elements with same priority are inserted before
}

RsGxsDataAccess::RsGxsDataAccess(RsGeneralDataService* ds) :
    mDataStore(ds), mDataMutex("RsGxsDataAccess"), mNextToken(0) {}


RsGxsDataAccess::~RsGxsDataAccess()
{
    for(auto& it:mRequestQueue)
		delete it.second;
}
bool RsGxsDataAccess::requestGroupInfo( uint32_t &token, uint32_t ansType, const RsTokReqOptions &opts, const std::list<RsGxsGroupId> &groupIds )
{
	if(groupIds.empty())
	{
        std::cerr << __PRETTY_FUNCTION__ << " (WW) Group Id list is empty!" << std::endl;
		return false;
	}

    GxsRequest* req = nullptr;
    uint32_t reqType = opts.mReqType;

    if(reqType & GXS_REQUEST_TYPE_GROUP_META)
    {
            GroupMetaReq* gmr = new GroupMetaReq();
            gmr->mGroupIds = groupIds;
            req = gmr;
    }
    else if(reqType & GXS_REQUEST_TYPE_GROUP_DATA)
    {
            GroupDataReq* gdr = new GroupDataReq();
            gdr->mGroupIds = groupIds;
            req = gdr;
    }
    else if(reqType & GXS_REQUEST_TYPE_GROUP_IDS)
    {
            GroupIdReq* gir = new GroupIdReq();
            gir->mGroupIds = groupIds;
            req = gir;
    }
    else if(reqType & GXS_REQUEST_TYPE_GROUP_SERIALIZED_DATA)
    {
            GroupSerializedDataReq* gir = new GroupSerializedDataReq();
            gir->mGroupIds = groupIds;
            req = gir;
    }

	if(!req)
	{
		RsErr() << __PRETTY_FUNCTION__ << " request type not recognised, " << "reqType: " << reqType << std::endl;
		return false;
	}

	generateToken(token);

#ifdef DATA_DEBUG
    GXSDATADEBUG << "RsGxsDataAccess::requestGroupInfo() gets token: " << token << std::endl;
#endif

    setReq(req, token, ansType, opts);
    storeRequest(req);

    return true;
}

bool RsGxsDataAccess::requestGroupInfo(uint32_t &token, uint32_t ansType, const RsTokReqOptions &opts)
{

    GxsRequest* req = nullptr;
    uint32_t reqType = opts.mReqType;

    if(reqType & GXS_REQUEST_TYPE_GROUP_META)
            req = new GroupMetaReq();
    else if(reqType & GXS_REQUEST_TYPE_GROUP_DATA)
            req = new GroupDataReq();
    else if(reqType & GXS_REQUEST_TYPE_GROUP_IDS)
            req = new GroupIdReq();
    else if(reqType & GXS_REQUEST_TYPE_GROUP_SERIALIZED_DATA)
            req = new GroupSerializedDataReq();
    else
    {
            RsErr() << "RsGxsDataAccess::requestGroupInfo() request type not recognised, type " << reqType << std::endl;
            return false;
    }

	generateToken(token);
#ifdef DATA_DEBUG
    GXSDATADEBUG << "RsGxsDataAccess::requestGroupInfo() gets Token: " << token << std::endl;
#endif

    setReq(req, token, ansType, opts);
    storeRequest(req);

    return true;
}

void RsGxsDataAccess::generateToken(uint32_t &token)
{
	RS_STACK_MUTEX(mDataMutex);
	token = mNextToken++;
}


bool RsGxsDataAccess::requestMsgInfo(uint32_t &token, uint32_t ansType, const RsTokReqOptions &opts, const GxsMsgReq &msgIds)
{

	GxsRequest* req = nullptr;
	uint32_t reqType = opts.mReqType;

        // remove all empty grpId entries
        GxsMsgReq::const_iterator mit = msgIds.begin();
        std::vector<RsGxsGroupId> toRemove;

        for(; mit != msgIds.end(); ++mit)
        {
            if(mit->second.empty())
                toRemove.push_back(mit->first);
        }

        std::vector<RsGxsGroupId>::const_iterator vit = toRemove.begin();

        GxsMsgReq filteredMsgIds = msgIds;

        for(; vit != toRemove.end(); ++vit)
            filteredMsgIds.erase(*vit);

        if(reqType & GXS_REQUEST_TYPE_MSG_META)
	{
		MsgMetaReq* mmr = new MsgMetaReq();
		mmr->mMsgIds = filteredMsgIds;
		req = mmr;

        }else if(reqType & GXS_REQUEST_TYPE_MSG_DATA)
	{
		MsgDataReq* mdr = new MsgDataReq();
		mdr->mMsgIds = filteredMsgIds;
		req = mdr;

        }else if(reqType & GXS_REQUEST_TYPE_MSG_IDS)
	{
		MsgIdReq* mir = new MsgIdReq();
		mir->mMsgIds = filteredMsgIds;
		req = mir;

	}

	if(req == nullptr)
	{
		RsErr() << "RsGxsDataAccess::requestMsgInfo() request type not recognised, type " << reqType << std::endl;
		return false;
	}else
	{
		generateToken(token);
#ifdef DATA_DEBUG
        GXSDATADEBUG << "RsGxsDataAccess::requestMsgInfo() gets Token: " << token << std::endl;
#endif
	}

	setReq(req, token, ansType, opts);
	storeRequest(req);
	return true;
}

bool RsGxsDataAccess::requestMsgInfo(uint32_t &token, uint32_t ansType, const RsTokReqOptions &opts, const std::list<RsGxsGroupId>& grpIds)
{
        GxsRequest* req = nullptr;
        uint32_t reqType = opts.mReqType;

        std::list<RsGxsGroupId>::const_iterator lit = grpIds.begin();

        if(reqType & GXS_REQUEST_TYPE_MSG_META)
        {
                MsgMetaReq* mmr = new MsgMetaReq();

                for(; lit != grpIds.end(); ++lit)
                    mmr->mMsgIds[*lit] = std::set<RsGxsMessageId>();

                req = mmr;
        }
        else if(reqType & GXS_REQUEST_TYPE_MSG_DATA)
        {
                MsgDataReq* mdr = new MsgDataReq();

                for(; lit != grpIds.end(); ++lit)
                    mdr->mMsgIds[*lit] = std::set<RsGxsMessageId>();

                req = mdr;
        }
        else if(reqType & GXS_REQUEST_TYPE_MSG_IDS)
        {
                MsgIdReq* mir = new MsgIdReq();

                for(; lit != grpIds.end(); ++lit)
                    mir->mMsgIds[*lit] = std::set<RsGxsMessageId>();

                req = mir;
        }

        if(req == nullptr)
        {
                RsErr() << __PRETTY_FUNCTION__ << " request type not recognised, type " << reqType << std::endl;
                return false;
        }else
        {
                generateToken(token);
#ifdef DATA_DEBUG
                GXSDATADEBUG << __PRETTY_FUNCTION__ << " gets Token: " << token << std::endl;
#endif
        }

        setReq(req, token, ansType, opts);
        storeRequest(req);
        return true;
}


void RsGxsDataAccess::requestServiceStatistic(uint32_t& token,const RsTokReqOptions& opts)
{
    ServiceStatisticRequest* req = new ServiceStatisticRequest();

    generateToken(token);

    if(opts.mReqType != GXS_REQUEST_TYPE_SERVICE_STATS)
    {
        RsErr() << "Expected opts.mReqType to be GXS_REQUEST_TYPE_SERVICE_STATS requestServiceStatistic()" << std::endl;
        return;
    }

    setReq(req, token, 0, opts);
    storeRequest(req);
}

void RsGxsDataAccess::requestGroupStatistic(uint32_t& token, const RsGxsGroupId& grpId,const RsTokReqOptions& opts)
{
    GroupStatisticRequest* req = new GroupStatisticRequest();
    req->mGrpId = grpId;

    if(opts.mReqType != GXS_REQUEST_TYPE_GROUP_STATS)
    {
        RsErr() << "Expected opts.mReqType to be GXS_REQUEST_TYPE_SERVICE_STATS requestServiceStatistic()" << std::endl;
        return;
    }

    generateToken(token);

    setReq(req, token,0, opts);
    storeRequest(req);
}

bool RsGxsDataAccess::requestMsgRelatedInfo(uint32_t &token, uint32_t ansType, const RsTokReqOptions &opts, const std::vector<RsGxsGrpMsgIdPair> &msgIds)
{

    MsgRelatedInfoReq* req = new MsgRelatedInfoReq();
    req->mMsgIds = msgIds;

    generateToken(token);

    setReq(req, token, ansType, opts);
    storeRequest(req);

    return true;
}


void RsGxsDataAccess::setReq(GxsRequest* req, uint32_t token, uint32_t ansType, const RsTokReqOptions& opts) const
{
	req->token = token;
	req->clientAnswerType = ansType;
	req->Options = opts;
	return;
}
void RsGxsDataAccess::storeRequest(GxsRequest* req)
{
	RS_STACK_MUTEX(mDataMutex);
	req->status = PENDING;
	req->reqTime = time(nullptr);

	mRequestQueue.insert(std::make_pair(req->token,req));
    mPublicToken[req->token] = PENDING;

#ifdef DATA_DEBUG
    GXSDATADEBUG << "Stored request token=" << req->token << " priority = " << static_cast<int>(req->Options.mPriority) << " Current request Queue is:" ;
    for(auto it(mRequestQueue.begin());it!=mRequestQueue.end();++it)
        GXSDATADEBUG << it->first << " (p=" << static_cast<int>(req->Options.mPriority) << ") ";
    GXSDATADEBUG << std::endl;
    GXSDATADEBUG << "PublicToken size: " << mPublicToken.size() << " Completed requests waiting for client: " << mCompletedRequests.size() << std::endl;
#endif
}

RsTokenService::GxsRequestStatus RsGxsDataAccess::requestStatus(uint32_t token)
{
	RsTokenService::GxsRequestStatus status;
	uint32_t reqtype;
	uint32_t anstype;
	rstime_t ts;

	if (!checkRequestStatus(token, status, reqtype, anstype, ts))
		return RsTokenService::FAILED;

	return status;
}

bool RsGxsDataAccess::cancelRequest(const uint32_t& token)
{
	RsStackMutex stack(mDataMutex); /****** LOCKED *****/

    GxsRequest* req = locked_retrieveCompletedRequest(token);
	if (!req)
	{
		return false;
	}

	req->status = CANCELLED;

	return true;
}

bool RsGxsDataAccess::clearRequest(const uint32_t& token)
{
	RS_STACK_MUTEX(mDataMutex);
    return locked_clearRequest(token);
}

bool RsGxsDataAccess::locked_clearRequest(const uint32_t& token)
{
    auto it = mCompletedRequests.find(token);

    if(it == mCompletedRequests.end())
        return false;

    delete it->second;
    mCompletedRequests.erase(it);

    auto it2 = mPublicToken.find(token);
    if(it2 != mPublicToken.end())
        mPublicToken.erase(it2);

#ifdef DATA_DEBUG
    GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": Removing public token " << token << ". Completed tokens: " << mCompletedRequests.size() << " Size of mPublicToken: " << mPublicToken.size() << std::endl;
#endif
    return true;
}

bool RsGxsDataAccess::getGroupSummary(const uint32_t& token, std::list<std::shared_ptr<RsGxsGrpMetaData> >& groupInfo)
{
	RS_STACK_MUTEX(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
	{
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve group summary" << std::endl;
		return false;
	}

	GroupMetaReq* gmreq = dynamic_cast<GroupMetaReq*>(req);

	if(gmreq)
	{
		groupInfo = gmreq->mGroupMetaData;
		gmreq->mGroupMetaData.clear();
	}
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed cast" << std::endl;
		return false;
	}
	locked_clearRequest(token);

	return true;
}

bool RsGxsDataAccess::getGroupData(const uint32_t& token, std::list<RsNxsGrp*>& grpData)
{
	RS_STACK_MUTEX(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
	{
		RsErr() << "RsGxsDataAccess::getGroupData() Unable to retrieve group data" << std::endl;
		return false;
	}

	GroupDataReq* gmreq = dynamic_cast<GroupDataReq*>(req);
	GroupSerializedDataReq* gsreq = dynamic_cast<GroupSerializedDataReq*>(req);

	if(gsreq)
	{
		grpData.swap(gsreq->mGroupData);
		gsreq->mGroupData.clear();
	}
	else if(gmreq)
	{
		grpData.swap(gmreq->mGroupData);
		gmreq->mGroupData.clear();
	}
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed cast req->reqType: " << req->reqType << std::endl;
		return false;
	}
	locked_clearRequest(token);

	return true;
}

bool RsGxsDataAccess::getMsgData(const uint32_t& token, NxsMsgDataResult& msgData)
{

	RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
    {

		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve group data" << std::endl;
		return false;
	}

	MsgDataReq* mdreq = dynamic_cast<MsgDataReq*>(req);

	if(mdreq)
	{
		msgData.swap(mdreq->mMsgData);
		mdreq->mMsgData.clear();
	}
	else
	{
		RsErr() << "RsGxsDataAccess::getMsgData() Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);

	return true;
}

bool RsGxsDataAccess::getMsgRelatedData(const uint32_t& token, NxsMsgRelatedDataResult& msgData)
{

        RsStackMutex stack(mDataMutex);

        GxsRequest* req = locked_retrieveCompletedRequest(token);

        if(req == nullptr)
        {
			RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve group data" << std::endl;
			return false;
		}
		MsgRelatedInfoReq* mrireq = dynamic_cast<MsgRelatedInfoReq*>(req);

		if(req->Options.mReqType != GXS_REQUEST_TYPE_MSG_RELATED_DATA)
			return false;

		if(mrireq)
		{
			msgData.swap(mrireq->mMsgDataResult);
			mrireq->mMsgDataResult.clear();
		}
		else
		{
			RsErr() << __PRETTY_FUNCTION__ << " Req found, failed caste" << std::endl;
			return false;
		}

		locked_clearRequest(token);

        return true;
}

bool RsGxsDataAccess::getMsgSummary(const uint32_t& token, GxsMsgMetaResult& msgInfo)
{

	RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
    {
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve group data" << std::endl;
		return false;
	}
	MsgMetaReq* mmreq = dynamic_cast<MsgMetaReq*>(req);

	if(mmreq)
	{
		msgInfo.swap(mmreq->mMsgMetaData);
		mmreq->mMsgMetaData.clear();
	}
	else
	{
		RsErr() << " Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);
	return true;
}

bool RsGxsDataAccess::getMsgRelatedSummary(const uint32_t &token, MsgRelatedMetaResult &msgMeta)
{
	RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
	{
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve message summary" << std::endl;
		return false;
	}
	if(req->Options.mReqType != GXS_REQUEST_TYPE_MSG_RELATED_META)
		return false;

	MsgRelatedInfoReq* mrireq = dynamic_cast<MsgRelatedInfoReq*>(req);

	if(mrireq)
	{
		msgMeta.swap(mrireq->mMsgMetaResult);
		mrireq->mMsgMetaResult.clear();
	}
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);
	return true;
}


bool RsGxsDataAccess::getMsgRelatedList(const uint32_t &token, MsgRelatedIdResult &msgIds)
{
	RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
	{
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve message data" << std::endl;
		return false;
	}
	if(req->Options.mReqType != GXS_REQUEST_TYPE_MSG_RELATED_IDS)
		return false;

	MsgRelatedInfoReq* mrireq = dynamic_cast<MsgRelatedInfoReq*>(req);

	if(mrireq)
	{
		msgIds.swap(mrireq->mMsgIdResult);
		mrireq->mMsgIdResult.clear();
	}
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);
	return true;
}

bool RsGxsDataAccess::getMsgIdList(const uint32_t& token, GxsMsgIdResult& msgIds)
{
	RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
    {
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve msg Ids" << std::endl;
		return false;
	}
	MsgIdReq* mireq = dynamic_cast<MsgIdReq*>(req);

	if(mireq)
	{
		msgIds.swap(mireq->mMsgIdResult);
		mireq->mMsgIdResult.clear();
	}
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed cast" << std::endl;
		return false;
	}
	locked_clearRequest(token);
	return true;
}

bool RsGxsDataAccess::getGroupList(const uint32_t& token, std::list<RsGxsGroupId>& groupIds)
{
	RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req == nullptr)
    {
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve group Ids, Request does not exist" << std::endl;
		return false;
	}
	GroupIdReq* gireq = dynamic_cast<GroupIdReq*>(req);

	if(gireq)
	{
		groupIds.swap(gireq->mGroupIdResult);
		gireq->mGroupIdResult.clear();
	}
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);
	return true;
}

bool RsGxsDataAccess::getGroupStatistic(const uint32_t &token, GxsGroupStatistic &grpStatistic)
{
    RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

    if(req == nullptr)
	{
		RsErr() << "RsGxsDataAccess::getGroupStatistic() Unable to retrieve grp stats" << std::endl;
		return false;
	}
	GroupStatisticRequest* gsreq = dynamic_cast<GroupStatisticRequest*>(req);

	if(gsreq)
		grpStatistic = gsreq->mGroupStatistic;
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);
    return true;
}

bool RsGxsDataAccess::getServiceStatistic(const uint32_t &token, GxsServiceStatistic &servStatistic)
{
    RsStackMutex stack(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

    if(req == nullptr)
    {
		RsErr() << __PRETTY_FUNCTION__ << " Unable to retrieve service stats" << std::endl;
		return false;
	}
	ServiceStatisticRequest* ssreq = dynamic_cast<ServiceStatisticRequest*>(req);

	if(ssreq)
		servStatistic = ssreq->mServiceStatistic;
	else
	{
		RsErr() << __PRETTY_FUNCTION__ << " Req found, failed caste" << std::endl;
		return false;
	}
	locked_clearRequest(token);
    return true;
}
GxsRequest* RsGxsDataAccess::locked_retrieveCompletedRequest(const uint32_t& token)
{
	auto it = mCompletedRequests.find(token) ;

	if(it == mCompletedRequests.end())
		return nullptr;

	return it->second;
}

#define MAX_REQUEST_AGE 120 // 2 minutes

void RsGxsDataAccess::processRequests()
{
	// process requests

	while (!mRequestQueue.empty())
	{
#ifdef DATA_DEBUG
        dumpTokenQueues();
#endif
        // Extract the first elements from the request queue. cleanup all other elements marked at terminated.

		GxsRequest* req = nullptr;
		{
			RsStackMutex stack(mDataMutex); /******* LOCKED *******/
			rstime_t now = time(nullptr); // this is ok while in the loop below

			while(!mRequestQueue.empty() && req == nullptr)
			{
				if(now > mRequestQueue.begin()->second->reqTime + MAX_REQUEST_AGE)
				{
					mPublicToken[mRequestQueue.begin()->second->token] = CANCELLED;
					delete mRequestQueue.begin()->second;
					mRequestQueue.erase(mRequestQueue.begin());
					continue;
				}

				switch( mRequestQueue.begin()->second->status )
				{
					case PARTIAL:
						RsErr() << "Found partial request in mRequestQueue. This is a bug." << std::endl;	// fallthrough
					case COMPLETE:
					case DONE:
					case FAILED:
					case CANCELLED:
#ifdef DATA_DEBUG
                        GXSDATADEBUG << "  Service " << std::hex << mDataStore->serviceType() << std::dec << ": request " << mRequestQueue.begin()->second->token << ": status = " << mRequestQueue.begin()->second->status << ": removing from the RequestQueue" << std::endl;
#endif
						delete mRequestQueue.begin()->second;
						mRequestQueue.erase(mRequestQueue.begin());
					continue;
					break;
					case PENDING:
						req = mRequestQueue.begin()->second;
						req->status = PARTIAL;
						mRequestQueue.erase(mRequestQueue.begin()); // remove it right away from the waiting queue.
					break;
				}

			}
		} // END OF MUTEX.

		if (!req)
			break;

		GroupMetaReq* gmr;
		GroupDataReq* gdr;
		GroupIdReq* gir;

		MsgMetaReq* mmr;
		MsgDataReq* mdr;
		MsgIdReq* mir;
		MsgRelatedInfoReq* mri;
		GroupStatisticRequest* gsr;
		GroupSerializedDataReq* grr;
		ServiceStatisticRequest* ssr;

#ifdef DATA_DEBUG
        GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": Processing request: " << req->token << " Status: " << req->status << " ReqType: " << req->reqType << " Age: " << time(nullptr) - req->reqTime << std::endl;
#endif

		/* PROCESS REQUEST! */
		bool ok = false;

		if((gmr = dynamic_cast<GroupMetaReq*>(req)) != nullptr)
		{
			ok = getGroupSummary(gmr);
		}
		else if((gdr = dynamic_cast<GroupDataReq*>(req)) != nullptr)
		{
			ok = getGroupData(gdr);
		}
		else if((gir = dynamic_cast<GroupIdReq*>(req)) != nullptr)
		{
			ok = getGroupList(gir);
		}
		else if((mmr = dynamic_cast<MsgMetaReq*>(req)) != nullptr)
		{
			ok = getMsgSummary(mmr);
		}
		else if((mdr = dynamic_cast<MsgDataReq*>(req)) != nullptr)
		{
			ok = getMsgData(mdr);
		}
		else if((mir = dynamic_cast<MsgIdReq*>(req)) != nullptr)
		{
			ok = getMsgIdList(mir);
		}
		else if((mri = dynamic_cast<MsgRelatedInfoReq*>(req)) != nullptr)
		{
			ok = getMsgRelatedInfo(mri);
		}
		else if((gsr = dynamic_cast<GroupStatisticRequest*>(req)) != nullptr)
		{
			ok = getGroupStatistic(gsr);
		}
		else if((ssr = dynamic_cast<ServiceStatisticRequest*>(req)) != nullptr)
		{
			ok = getServiceStatistic(ssr);
		}
		else if((grr = dynamic_cast<GroupSerializedDataReq*>(req)) != nullptr)
		{
			ok = getGroupSerializedData(grr);
		}
		else
			RsErr() << __PRETTY_FUNCTION__ << " Failed to process request, token: " << req->token << std::endl;

		// We cannot easily remove the request here because the queue may have more elements now and mRequestQueue.begin() is not necessarily the same element.
		// but we mark it as COMPLETE/FAILED so that it will be removed in the next loop.
		{
			RsStackMutex stack(mDataMutex); /******* LOCKED *******/

			if(ok)
			{
				// When the request is complete, we move it to the complete list, so that the caller can easily retrieve the request data

#ifdef DATA_DEBUG
                GXSDATADEBUG << "  Service " << std::hex << mDataStore->serviceType() << std::dec << ": Request completed successfully. Marking as COMPLETE." << std::endl;
#endif
				req->status = COMPLETE ;
				mCompletedRequests[req->token] = req;
				mPublicToken[req->token] = COMPLETE;
			}
			else
			{
				mPublicToken[req->token] = FAILED;
				delete req;//req belongs to no one now
#ifdef DATA_DEBUG
                GXSDATADEBUG << "  Service " << std::hex << mDataStore->serviceType() << std::dec << ": Request failed. Marking as FAILED." << std::endl;
#endif
			}
		} // END OF MUTEX.

	}
}



bool RsGxsDataAccess::getGroupSerializedData(GroupSerializedDataReq* req)
{
	std::map<RsGxsGroupId, RsNxsGrp*> grpData;
	std::list<RsGxsGroupId> grpIdsOut;

	getGroupList(req->mGroupIds, req->Options, grpIdsOut);

	if(grpIdsOut.empty())
		return true;


	for(std::list<RsGxsGroupId>::iterator lit = grpIdsOut.begin();lit != grpIdsOut.end();++lit)
		grpData[*lit] = nullptr;

    bool ok = mDataStore->retrieveNxsGrps(grpData, true);
    req->mGroupData.clear();

	std::map<RsGxsGroupId, RsNxsGrp*>::iterator mit = grpData.begin();

	for(; mit != grpData.end(); ++mit)
        req->mGroupData.push_back(mit->second) ;

	return ok;
}
bool RsGxsDataAccess::getGroupData(GroupDataReq* req)
{
	std::map<RsGxsGroupId, RsNxsGrp*> grpData;
        std::list<RsGxsGroupId> grpIdsOut;

        getGroupList(req->mGroupIds, req->Options, grpIdsOut);

        if(grpIdsOut.empty())
            return true;

        std::list<RsGxsGroupId>::iterator lit = grpIdsOut.begin(),
        lit_end = grpIdsOut.end();

        for(; lit != lit_end; ++lit)
        {
            grpData[*lit] = nullptr;
        }

        bool ok = mDataStore->retrieveNxsGrps(grpData, true);

	std::map<RsGxsGroupId, RsNxsGrp*>::iterator mit = grpData.begin();
	for(; mit != grpData.end(); ++mit)
		req->mGroupData.push_back(mit->second);

        return ok;
}

bool RsGxsDataAccess::getGroupSummary(GroupMetaReq* req)
{

	RsGxsGrpMetaTemporaryMap grpMeta;
	std::list<RsGxsGroupId> grpIdsOut;

	getGroupList(req->mGroupIds, req->Options, grpIdsOut);

	if(grpIdsOut.empty())
		return true;

    for(auto lit = grpIdsOut.begin();lit != grpIdsOut.end(); ++lit)
		grpMeta[*lit] = nullptr;

    mDataStore->retrieveGxsGrpMetaData(grpMeta);

    for(auto mit = grpMeta.begin(); mit != grpMeta.end(); ++mit)
		req->mGroupMetaData.push_back(mit->second);

	return true;
}

bool RsGxsDataAccess::getGroupList(GroupIdReq* req)
{
    return getGroupList(req->mGroupIds, req->Options, req->mGroupIdResult);
}

bool RsGxsDataAccess::getGroupList(const std::list<RsGxsGroupId>& grpIdsIn, const RsTokReqOptions& opts, std::list<RsGxsGroupId>& grpIdsOut)
{
	RsGxsGrpMetaTemporaryMap grpMeta;

    for(auto lit = grpIdsIn.begin(); lit != grpIdsIn.end(); ++lit)
		grpMeta[*lit] = nullptr;

    mDataStore->retrieveGxsGrpMetaData(grpMeta);

    for(auto mit = grpMeta.begin() ; mit != grpMeta.end(); ++mit)
		grpIdsOut.push_back(mit->first);

    filterGrpList(grpIdsOut, opts, grpMeta);

    return true;
}

bool RsGxsDataAccess::getMsgData(MsgDataReq* req)
{
	GxsMsgReq msgIdOut;

	const RsTokReqOptions& opts(req->Options);

	// filter based on options
	getMsgIdList(req->mMsgIds, opts, msgIdOut);

	// If the list is empty because of filtering do not retrieve from DB
	if((opts.mMsgFlagMask || opts.mStatusMask) && msgIdOut.empty())
		return true;

    mDataStore->retrieveNxsMsgs(msgIdOut, req->mMsgData, true);
	return true;
}


bool RsGxsDataAccess::getMsgSummary(MsgMetaReq* req)
{
	GxsMsgReq msgIdOut;

	const RsTokReqOptions& opts(req->Options);

	// filter based on options
	getMsgMetaDataList(req->mMsgIds, opts, req->mMsgMetaData);

//	// If the list is empty because of filtering do not retrieve from DB
//	if((opts.mMsgFlagMask || opts.mStatusMask) && msgIdOut.empty())
//		return true;
//
//	mDataStore->retrieveGxsMsgMetaData(msgIdOut, req->mMsgMetaData);

	return true;
}

bool RsGxsDataAccess::getMsgMetaDataList( const GxsMsgReq& msgIds, const RsTokReqOptions& opts, GxsMsgMetaResult& result )
{
    // First get all message metas, then filter out the ones we want to keep.
    result.clear();
    mDataStore->retrieveGxsMsgMetaData(msgIds, result);

    /* CASEs this handles.
     * Input is groupList + Flags.
     * 1) No Flags => All Messages in those Groups.
     *
     */
#ifdef DATA_DEBUG
    GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgList()" << std::endl;
#endif

    bool onlyOrigMsgs = false;
    bool onlyLatestMsgs = false;
    bool onlyThreadHeadMsgs = false;

    // Can only choose one of these two.
    if (opts.mOptions & RS_TOKREQOPT_MSG_ORIGMSG)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgList() MSG_ORIGMSG" << std::endl;
#endif
            onlyOrigMsgs = true;
    }
    else if (opts.mOptions & RS_TOKREQOPT_MSG_LATEST)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgList() MSG_LATEST" << std::endl;
#endif
            onlyLatestMsgs = true;
    }

    if (opts.mOptions & RS_TOKREQOPT_MSG_THREAD)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgList() MSG_THREAD" << std::endl;
#endif
            onlyThreadHeadMsgs = true;
    }

    GxsMsgMetaResult::iterator meta_it;

    for(meta_it = result.begin(); meta_it != result.end(); ++meta_it)
    {
            //const RsGxsGroupId& grpId = meta_it->first;

            //auto& filter( metaFilter[grpId] ); // does the initialization of metaFilter[grpId] and avoids further O(log(n)) calls

            auto& metaV = meta_it->second;

            if (onlyLatestMsgs) // if we only consider latest messages, we need to first filter out messages with "children"
            {
                // The strategy is the following: for each msg we only know its direct ancestor. So we build a map to be able to find for a given message
                // which messages derive from it.
                // Then when this map is fuly build, we follow this map and every message that has no direct follow up will be kept.
                // Because msgs are stored in a std::vector we build a map to convert each vector to its position in metaV.

               std::vector<bool> keep(metaV.size(),true);	   // this vector will tell wether we keep or not a given Meta
               std::map<RsGxsMessageId,uint32_t> index_in_metaV; // holds the index of each group Id in metaV

               for(uint32_t i=0;i<metaV.size();++i)
                   index_in_metaV[metaV[i]->mMsgId] = i;

               // Now loop once over message Metas and see if they have a parent. If yes, then mark the parent to be discarded.

               for(uint32_t i=0;i<metaV.size();++i)
                   if(!metaV[i]->mOrigMsgId.isNull() && metaV[i]->mOrigMsgId != metaV[i]->mMsgId)	// this one is a follow up
                   {
                       auto it = index_in_metaV.find(metaV[i]->mOrigMsgId);

                       if(it != index_in_metaV.end())
                           keep[it->second] = false;
                       else
                           std::cerr << "Found a msg that has a parent that is not locally known. Not an error anyway." << std::endl;

                   }

               // Finally we just discard the messages for which the keep flag has been set to false.

               for(uint32_t i=0;i<metaV.size();++i)
                   if(!keep[i])
                   {
                       //delete metaV[i];
                       metaV[i] = nullptr;
                   }
			}

// old version of the code. I keep it for future reference if something happens.

#ifdef OLD_VERSION_OF_THE_CODE
                    // RUN THROUGH ALL MSGS... in map origId -> TS.
                    std::map<RsGxsMessageId, std::pair<RsGxsMessageId, rstime_t> > origMsgTs;

                    for(uint32_t i=0;i<metaV.size();++i)
                    {
                        RsGxsMsgMetaData* msgMeta = metaV[i];

                        /* if we are grabbing thread Head... then parentId == empty. */
                        if (onlyThreadHeadMsgs && !(msgMeta->mParentId.isNull()))
                        {
                            delete msgMeta;
                            metaV[i] = nullptr;
                            continue;
                        }

                        auto oit = origMsgTs.find(msgMeta->mOrigMsgId);

                        bool addMsg = false;
                        if (oit != origMsgTs.end())
                        {
                            if(oit->second.second > msgMeta->mPublishTs)
                            {
#ifdef DATA_DEBUG
								std::cerr << "RsGxsDataAccess::getMsgList() Found New OrigMsgId: ";
								std::cerr << msgMeta->mOrigMsgId;
								std::cerr << " MsgId: " << msgMeta->mMsgId;
								std::cerr << " TS: " << msgMeta->mPublishTs;
								std::cerr << std::endl;
#endif
								origMsgTs[msgMeta->mOrigMsgId] = std::make_pair(msgMeta->mMsgId, msgMeta->mPublishTs); // add as latest. (overwriting if necessary)
                            }
                        }
                        else
                        {
                            delete msgMeta;
                            metaV[i] = nullptr;
                            continue;
                        }


                    }

                    // Add the discovered Latest Msgs.
                    for(auto oit = origMsgTs.begin(); oit != origMsgTs.end(); ++oit)
                    {
						msgIdsOut[grpId].insert(oit->second.first);
                    }
#endif

			for(uint32_t i=0;i<metaV.size();++i)
                if(metaV[i] != nullptr)
				{
					const auto& msgMeta = metaV[i];

					/* if we are grabbing thread Head... then parentId == empty. */
					if (onlyThreadHeadMsgs && !msgMeta->mParentId.isNull())
					{
						//delete msgMeta;
						metaV[i] = nullptr;
						continue;
					}

					if (onlyOrigMsgs && !msgMeta->mOrigMsgId.isNull() && msgMeta->mMsgId != msgMeta->mOrigMsgId)
					{
						//delete msgMeta;
						metaV[i] = nullptr;
						continue;
					}
				}
    }

    // collapse results while keeping the order, eliminating empty slots

    for(auto it(result.begin());it!=result.end();++it)
    {
        uint32_t j=0; // j is the end of the cleaned-up tab, at the first available place

        for(uint32_t i=0;i<it->second.size();++i) // i is the index in the tab possibly containing nullptr's
            if(it->second[i] != nullptr)
            {
				it->second[j] = it->second[i]; // move the pointer to the first available place
                ++j;
            }

        it->second.resize(j);	// normally all pointers have been moved forward so there is nothing to delete here.
    }

    // filterMsgIdList(msgIdsOut, opts, metaFilter); // this call is absurd: we already have in metaFilter the content we want.

    //metaFilter.clear();

    // delete meta data
    //cleanseMsgMetaMap(result);

    return true;
}

bool RsGxsDataAccess::getMsgIdList( const GxsMsgReq& msgIds, const RsTokReqOptions& opts, GxsMsgReq& msgIdsOut )
{
    GxsMsgMetaResult result;

	getMsgMetaDataList( msgIds, opts, result );

    // extract MessageIds

    msgIdsOut.clear();

    for(auto it(result.begin());it!=result.end();++it)
    {
        auto& id_set(msgIdsOut[it->first]);

        for(uint32_t i=0;i<it->second.size();++i)
            id_set.insert(it->second[i]->mMsgId);
    }

    // delete meta data
    //cleanseMsgMetaMap(result);

    return true;
}

bool RsGxsDataAccess::getMsgRelatedInfo(MsgRelatedInfoReq *req)
{
    /* CASEs this handles.
     * Input is msgList + Flags.
     * 1) No Flags => return nothing
     */
#ifdef DATA_DEBUG
    GXSDATADEBUG << "RsGxsDataAccess::getMsgRelatedList()" << std::endl;
#endif

    const RsTokReqOptions& opts = req->Options;

    bool onlyLatestMsgs = false;
    bool onlyAllVersions = false;
    bool onlyChildMsgs = false;
    bool onlyThreadMsgs = false;

    if (opts.mOptions & RS_TOKREQOPT_MSG_LATEST)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgRelatedList() MSG_LATEST" << std::endl;
#endif
            onlyLatestMsgs = true;
    }
    else if (opts.mOptions & RS_TOKREQOPT_MSG_VERSIONS)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgRelatedList() MSG_VERSIONS" << std::endl;
#endif
            onlyAllVersions = true;
    }

    if (opts.mOptions & RS_TOKREQOPT_MSG_PARENT)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgRelatedList() MSG_PARENTS" << std::endl;
#endif
            onlyChildMsgs = true;
    }

    if (opts.mOptions & RS_TOKREQOPT_MSG_THREAD)
    {
#ifdef DATA_DEBUG
            GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgRelatedList() MSG_THREAD" << std::endl;
#endif
            onlyThreadMsgs = true;
    }

	if(onlyAllVersions && onlyChildMsgs)
	{
		RS_ERR("Incompatible FLAGS (VERSIONS & PARENT)");
		return false;
	}

	if(onlyAllVersions && onlyThreadMsgs)
	{
		RS_ERR("Incompatible FLAGS (VERSIONS & THREAD)");
		return false;
	}

	if((!onlyLatestMsgs) && onlyChildMsgs)
	{
		RS_ERR("Incompatible FLAGS (!LATEST & PARENT)");
		return false;
	}

	if((!onlyLatestMsgs) && onlyThreadMsgs)
	{
		RS_ERR("Incompatible FLAGS (!LATEST & THREAD)");
		return false;
	}

	if(onlyChildMsgs && onlyThreadMsgs)
	{
		RS_ERR("Incompatible FLAGS (PARENT & THREAD)");
		return false;
	}

	if( (!onlyLatestMsgs) && (!onlyAllVersions) && (!onlyChildMsgs) &&
	        (!onlyThreadMsgs) )
	{
		RS_WARN("NO FLAGS -> SIMPLY RETURN nothing");
		return true;
	}

    for(auto vit_msgIds(req->mMsgIds.begin()); vit_msgIds != req->mMsgIds.end(); ++vit_msgIds)
    {
        MsgMetaFilter filterMap;


        const RsGxsGrpMsgIdPair& grpMsgIdPair = *vit_msgIds;

        // get meta data for all in group
        GxsMsgMetaResult result;
        GxsMsgReq msgIds;
        msgIds.insert(std::make_pair(grpMsgIdPair.first, std::set<RsGxsMessageId>()));
        mDataStore->retrieveGxsMsgMetaData(msgIds, result);
        auto& metaV = result[grpMsgIdPair.first];

        // msg id to relate to
        const RsGxsMessageId& msgId = grpMsgIdPair.second;
        const RsGxsGroupId& grpId = grpMsgIdPair.first;

        std::set<RsGxsMessageId> outMsgIds;

        std::shared_ptr<RsGxsMsgMetaData> origMeta;

        for(auto vit_meta = metaV.begin(); vit_meta != metaV.end(); ++vit_meta)
            if(msgId == (*vit_meta)->mMsgId)
            {
                origMeta = *vit_meta;
                break;
            }

		if(!origMeta)
		{
			RS_ERR("Cannot find meta of msgId: ", msgId, " to relate to");
            continue;
		}

        const RsGxsMessageId& origMsgId = origMeta->mOrigMsgId;
        auto& metaMap = filterMap[grpId];

        if (onlyLatestMsgs)
        {
            if (onlyChildMsgs || onlyThreadMsgs)
            {
                // RUN THROUGH ALL MSGS... in map origId -> TS.
                std::map<RsGxsMessageId, std::pair<RsGxsMessageId, rstime_t> > origMsgTs;
                std::map<RsGxsMessageId, std::pair<RsGxsMessageId, rstime_t> >::iterator oit;

                for(auto vit_meta = metaV.begin(); vit_meta != metaV.end(); ++vit_meta)
                {
                    auto meta = *vit_meta;

                    // skip msgs that aren't children.
                    if (onlyChildMsgs)
                    {
                        if (meta->mParentId != origMsgId)
                        {
                            continue;
                        }
                    }
                    else /* onlyThreadMsgs */
                    {
                        if (meta->mThreadId != msgId)
                        {
                            continue;
                        }
                    }


                    oit = origMsgTs.find(meta->mOrigMsgId);

                    bool addMsg = false;
                    if (oit == origMsgTs.end())
                    {
#ifdef DATA_DEBUG
                        GXSDATADEBUG << "RsGxsDataAccess::getMsgRelatedList() Found New OrigMsgId: "
                                << meta->mOrigMsgId
								<< " MsgId: " << meta->mMsgId
                            	<< " TS: " << meta->mPublishTs
                            	<< std::endl;
#endif

                            addMsg = true;
                    }
                    // check timestamps.
                    else if (oit->second.second < meta->mPublishTs)
                    {
#ifdef DATA_DEBUG
                        GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": RsGxsDataAccess::getMsgRelatedList() Found Later Msg. OrigMsgId: "
                        		<< meta->mOrigMsgId
                        		<< " MsgId: " << meta->mMsgId
                        		<< " TS: " << meta->mPublishTs
                        		<< std::endl;
#endif

                            addMsg = true;
                    }

                    if (addMsg)
                    {
                        // add as latest. (overwriting if necessary)
                        origMsgTs[meta->mOrigMsgId] = std::make_pair(meta->mMsgId, meta->mPublishTs);
                        metaMap.insert(std::make_pair(meta->mMsgId, meta));
                    }
                }

                // Add the discovered Latest Msgs.
                for(oit = origMsgTs.begin(); oit != origMsgTs.end(); ++oit)
                {
                    outMsgIds.insert(oit->second.first);
                }
            }
            else
            {

                /* first guess is potentially better than Orig (can't be worse!) */
                rstime_t latestTs = 0;
                RsGxsMessageId latestMsgId;
                std::shared_ptr<RsGxsMsgMetaData> latestMeta;

                for(auto vit_meta = metaV.begin(); vit_meta != metaV.end(); ++vit_meta)
                    if ((*vit_meta)->mOrigMsgId == origMsgId)
                    {
                        if ((*vit_meta)->mPublishTs > latestTs)
                        {
                            latestTs = (*vit_meta)->mPublishTs;
                            latestMsgId = (*vit_meta)->mMsgId;
                            latestMeta = (*vit_meta);
                        }
                    }

                outMsgIds.insert(latestMsgId);
                metaMap.insert(std::make_pair(latestMsgId, latestMeta));
            }
        }
        else if (onlyAllVersions)
        {
            for(auto vit_meta = metaV.begin(); vit_meta != metaV.end(); ++vit_meta)
                if ((*vit_meta)->mOrigMsgId == origMsgId)
                {
                    outMsgIds.insert((*vit_meta)->mMsgId);
                    metaMap.insert(std::make_pair((*vit_meta)->mMsgId, (*vit_meta)));
                }
        }

        GxsMsgIdResult filteredOutMsgIds;
        filteredOutMsgIds[grpId] = outMsgIds;
        filterMsgIdList(filteredOutMsgIds, opts, filterMap);

        if(!filteredOutMsgIds[grpId].empty())
        {
            if(req->Options.mReqType == GXS_REQUEST_TYPE_MSG_RELATED_IDS)
            {
                req->mMsgIdResult[grpMsgIdPair] = filteredOutMsgIds[grpId];
            }
            else if(req->Options.mReqType == GXS_REQUEST_TYPE_MSG_RELATED_META)
            {
                GxsMsgMetaResult metaResult;
                mDataStore->retrieveGxsMsgMetaData(filteredOutMsgIds, metaResult);
                req->mMsgMetaResult[grpMsgIdPair] = metaResult[grpId];
            }
            else if(req->Options.mReqType == GXS_REQUEST_TYPE_MSG_RELATED_DATA)
            {
                GxsMsgResult msgResult;
                mDataStore->retrieveNxsMsgs(filteredOutMsgIds, msgResult, true);
                req->mMsgDataResult[grpMsgIdPair] = msgResult[grpId];
            }
        }

        outMsgIds.clear();
        filteredOutMsgIds.clear();
    }
    return true;
}

bool RsGxsDataAccess::getGroupStatistic(GroupStatisticRequest *req)
{
    // filter based on options
    GxsMsgIdResult metaReq;
    metaReq[req->mGrpId] = std::set<RsGxsMessageId>();
    GxsMsgMetaResult metaResult;
    mDataStore->retrieveGxsMsgMetaData(metaReq, metaResult);

    const auto& msgMetaV_it = metaResult.find(req->mGrpId);

    if(msgMetaV_it == metaResult.end())
        return false;

    const auto& msgMetaV(msgMetaV_it->second);

    req->mGroupStatistic.mGrpId = req->mGrpId;
    req->mGroupStatistic.mNumMsgs = msgMetaV.size();
    req->mGroupStatistic.mTotalSizeOfMsgs = 0;
    req->mGroupStatistic.mNumThreadMsgsNew = 0;
    req->mGroupStatistic.mNumThreadMsgsUnread = 0;
    req->mGroupStatistic.mNumChildMsgsNew = 0;
    req->mGroupStatistic.mNumChildMsgsUnread = 0;

    std::set<RsGxsMessageId> obsolete_msgs ;	// stored message ids that are referred to as older versions of an existing message

    for(uint32_t i = 0; i < msgMetaV.size(); ++i)
        if(!msgMetaV[i]->mOrigMsgId.isNull() && msgMetaV[i]->mOrigMsgId!=msgMetaV[i]->mMsgId)
            obsolete_msgs.insert(msgMetaV[i]->mOrigMsgId);

    for(uint32_t i = 0; i < msgMetaV.size(); ++i)
    {
        const auto& m = msgMetaV[i];
        req->mGroupStatistic.mTotalSizeOfMsgs += m->mMsgSize + m->serial_size();

        if(obsolete_msgs.find(m->mMsgId) != obsolete_msgs.end()) 	// skip obsolete messages.
            continue;

        if (IS_MSG_NEW(m->mMsgStatus))
        {
            if (m->mParentId.isNull())
                ++req->mGroupStatistic.mNumThreadMsgsNew;
            else
                ++req->mGroupStatistic.mNumChildMsgsNew;
        }
        if (IS_MSG_UNREAD(m->mMsgStatus))
        {
            if (m->mParentId.isNull())
                ++req->mGroupStatistic.mNumThreadMsgsUnread;
            else
                ++req->mGroupStatistic.mNumChildMsgsUnread;
        }
    }

    return true;
}

// potentially very expensive!
bool RsGxsDataAccess::getServiceStatistic(ServiceStatisticRequest *req)
{
	RsGxsGrpMetaTemporaryMap grpMeta ;

    mDataStore->retrieveGxsGrpMetaData(grpMeta);

    req->mServiceStatistic.mNumGrps = grpMeta.size();
    req->mServiceStatistic.mNumMsgs = 0;
    req->mServiceStatistic.mSizeOfGrps = 0;
    req->mServiceStatistic.mSizeOfMsgs = 0;
    req->mServiceStatistic.mNumGrpsSubscribed = 0;
    req->mServiceStatistic.mNumThreadMsgsNew = 0;
    req->mServiceStatistic.mNumThreadMsgsUnread = 0;
    req->mServiceStatistic.mNumChildMsgsNew = 0;
    req->mServiceStatistic.mNumChildMsgsUnread = 0;

    for(auto mit = grpMeta.begin(); mit != grpMeta.end(); ++mit)
    {
        const auto& m = mit->second;
        req->mServiceStatistic.mSizeOfGrps += m->mGrpSize + m->serial_size(RS_GXS_GRP_META_DATA_CURRENT_API_VERSION);

        if (IS_GROUP_SUBSCRIBED(m->mSubscribeFlags))
        {
            ++req->mServiceStatistic.mNumGrpsSubscribed;

            GroupStatisticRequest gr;
            gr.mGrpId = m->mGroupId;
            getGroupStatistic(&gr);

            req->mServiceStatistic.mNumMsgs += gr.mGroupStatistic.mNumMsgs;
            req->mServiceStatistic.mSizeOfMsgs += gr.mGroupStatistic.mTotalSizeOfMsgs;
            req->mServiceStatistic.mNumThreadMsgsNew += gr.mGroupStatistic.mNumThreadMsgsNew;
            req->mServiceStatistic.mNumThreadMsgsUnread += gr.mGroupStatistic.mNumThreadMsgsUnread;
            req->mServiceStatistic.mNumChildMsgsNew += gr.mGroupStatistic.mNumChildMsgsNew;
            req->mServiceStatistic.mNumChildMsgsUnread += gr.mGroupStatistic.mNumChildMsgsUnread;
        }
    }

    req->mServiceStatistic.mSizeStore = req->mServiceStatistic.mSizeOfGrps + req->mServiceStatistic.mSizeOfMsgs;

    return true;
}

bool RsGxsDataAccess::getMsgIdList(MsgIdReq* req)
{

    GxsMsgMetaResult result;
    mDataStore->retrieveGxsMsgMetaData(req->mMsgIds, result);

    for(auto mit = result.begin(); mit != result.end(); ++mit)
    {
        const RsGxsGroupId grpId = mit->first;
        auto& metaV = mit->second;

        for(auto vit=metaV.begin(); vit != metaV.end(); ++vit)
            req->mMsgIdResult[grpId].insert((*vit)->mMsgId);
    }

    GxsMsgReq msgIdOut;

    // filter based on options
    getMsgIdList(req->mMsgIdResult, req->Options, msgIdOut);
    req->mMsgIdResult = msgIdOut;

    return true;
}

void RsGxsDataAccess::filterMsgIdList( GxsMsgIdResult& resultsMap, const RsTokReqOptions& opts, const MsgMetaFilter& msgMetas ) const
{
	for( GxsMsgIdResult::iterator grpIt = resultsMap.begin(); grpIt != resultsMap.end(); ++grpIt )
	{
		const RsGxsGroupId& groupId(grpIt->first);
		std::set<RsGxsMessageId>& msgsIdSet(grpIt->second);

		MsgMetaFilter::const_iterator cit = msgMetas.find(groupId);
		if(cit == msgMetas.end()) continue;
#ifdef DATA_DEBUG
        GXSDATADEBUG << __PRETTY_FUNCTION__ << " " << msgsIdSet.size()
		          << " for group: " << groupId << " before filtering"
		          << std::endl;
#endif

		for( std::set<RsGxsMessageId>::iterator msgIdIt = msgsIdSet.begin(); msgIdIt != msgsIdSet.end(); )
		{
			const RsGxsMessageId& msgId(*msgIdIt);
            const auto& msgsMetaMap = cit->second;

			bool keep = false;
            auto msgsMetaMapIt = msgsMetaMap.find(msgId);

            if( msgsMetaMapIt != msgsMetaMap.end() )
				keep = checkMsgFilter(opts, msgsMetaMapIt->second);

			if(keep)
                ++msgIdIt;
			else
				msgIdIt = msgsIdSet.erase(msgIdIt);
		}

#ifdef DATA_DEBUG
        GXSDATADEBUG << __PRETTY_FUNCTION__ << " " << msgsIdSet.size()
		          << " for group: " << groupId << " after filtering"
		          << std::endl;
#endif
	}
}

void RsGxsDataAccess::filterGrpList(std::list<RsGxsGroupId> &grpIds, const RsTokReqOptions &opts, const GrpMetaFilter& meta) const
{
    for(auto lit = grpIds.begin(); lit != grpIds.end(); )
    {
        auto cit = meta.find(*lit);

        bool keep = false;

        if(cit != meta.end())
           keep = checkGrpFilter(opts, cit->second);

        if(keep)
            ++lit;
        else
            lit = grpIds.erase(lit);
    }
}


bool RsGxsDataAccess::checkRequestStatus( uint32_t token, GxsRequestStatus& status, uint32_t& reqtype, uint32_t& anstype, rstime_t& ts )
{
	RS_STACK_MUTEX(mDataMutex);

    GxsRequest* req = locked_retrieveCompletedRequest(token);

#ifdef DATA_DEBUG
    GXSDATADEBUG << "CheckRequestStatus: token=" << token << std::endl ;
#endif

    if(req != nullptr)
	{
		anstype = req->clientAnswerType;
		reqtype = req->reqType;
		status = COMPLETE;
		ts = req->reqTime;
#ifdef DATA_DEBUG
        GXSDATADEBUG << " Returning status = COMPLETE" << std::endl;
#endif
		return true;
	}

    auto it = mPublicToken.find(token);

    if(it != mPublicToken.end())
    {
		status = it->second;
#ifdef DATA_DEBUG
        GXSDATADEBUG << " Returning status = " << status << std::endl;
#endif
        return true;
    }

    status = FAILED;
#ifdef DATA_DEBUG
    GXSDATADEBUG << " Token not found. Returning FAILED" << std::endl;
#endif
    return false;
}

bool RsGxsDataAccess::addGroupData(RsNxsGrp* grp) {

	RsStackMutex stack(mDataMutex);

	std::list<RsNxsGrp*> grpM;
	grpM.push_back(grp);
	return mDataStore->storeGroup(grpM);
}

bool RsGxsDataAccess::updateGroupData(RsNxsGrp* grp) {

	RsStackMutex stack(mDataMutex);

	std::list<RsNxsGrp*> grpM;
	grpM.push_back(grp);
	return mDataStore->updateGroup(grpM);
}

bool RsGxsDataAccess::getGroupData(const RsGxsGroupId& grpId, RsNxsGrp *& grp_data)
{
	RsStackMutex stack(mDataMutex);

    std::map<RsGxsGroupId, RsNxsGrp*> grps ;

    grps[grpId] = nullptr ;

    if(mDataStore->retrieveNxsGrps(grps, false))	// the false here is very important: it removes the private key parts.
    {
        grp_data = grps.begin()->second;
        return true;
    }
    else
        return false ;
}

bool RsGxsDataAccess::addMsgData(RsNxsMsg* msg) {

	RsStackMutex stack(mDataMutex);

	std::list<RsNxsMsg*> msgM;
	msgM.push_back(msg);
	return mDataStore->storeMessage(msgM);
}



void RsGxsDataAccess::tokenList(std::list<uint32_t>& tokens)
{

	RsStackMutex stack(mDataMutex);

	for(auto& it:mRequestQueue)
		tokens.push_back(it.second->token);

	for(auto& it:mCompletedRequests)
        tokens.push_back(it.first);
}

bool RsGxsDataAccess::locked_updateRequestStatus( uint32_t token, RsTokenService::GxsRequestStatus status )
{
    GxsRequest* req = locked_retrieveCompletedRequest(token);

	if(req) req->status = status;
	else return false;

	return true;
}

uint32_t RsGxsDataAccess::generatePublicToken()
{
	uint32_t token;
	generateToken(token);

	{
		RS_STACK_MUTEX(mDataMutex);
		mPublicToken[token] = PENDING ;
#ifdef DATA_DEBUG
        GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": Adding new public token " << token << " in PENDING state. Completed tokens: " << mCompletedRequests.size() << " Size of mPublicToken: " << mPublicToken.size() << std::endl;
        if(mDataStore->serviceType() == 0x218 && token==19)
            print_stacktrace();
#endif
    }

	return token;
}



bool RsGxsDataAccess::updatePublicRequestStatus( uint32_t token, RsTokenService::GxsRequestStatus status )
{
	RS_STACK_MUTEX(mDataMutex);

	auto mit = mPublicToken.find(token);

	if(mit != mPublicToken.end())
    {
        mit->second = status;
#ifdef DATA_DEBUG
        GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": updating public token " << token << " to state  " << tokenStatusString[status] << std::endl;
#endif
        return true;
    }
	else
        return false;
}



bool RsGxsDataAccess::disposeOfPublicToken(uint32_t token)
{
	RS_STACK_MUTEX(mDataMutex);
	auto mit = mPublicToken.find(token);
	if(mit != mPublicToken.end())
	{
		mPublicToken.erase(mit);
#ifdef DATA_DEBUG
        GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": Deleting public token " << token << ". Completed tokens: " << mCompletedRequests.size() << " Size of mPublicToken: " << mPublicToken.size() << std::endl;
#endif
        return true;
	}
	else
        return false;
}

#ifdef DATA_DEBUG
void RsGxsDataAccess::dumpTokenQueues()
{
    RS_STACK_MUTEX(mDataMutex);

    GXSDATADEBUG << "Service " << std::hex << mDataStore->serviceType() << std::dec << ": dumping token list."<< std::endl;

    for(auto tokenpair:mPublicToken)
        GXSDATADEBUG << "    Public Token " << tokenpair.first << " : " << tokenStatusString[tokenpair.second] << std::endl;

    for(auto tokenpair:mCompletedRequests)
        GXSDATADEBUG << "    Completed Tokens: " << tokenpair.first << std::endl;

    for(auto tokenpair:mRequestQueue)
        GXSDATADEBUG << "    RequestQueue: " << tokenpair.first << " status " << tokenStatusString[tokenpair.second->status] << std::endl;

    GXSDATADEBUG << std::endl;
}
#endif

bool RsGxsDataAccess::checkGrpFilter(const RsTokReqOptions &opts, const std::shared_ptr<RsGxsGrpMetaData>& meta) const
{

    bool subscribeMatch = false;

    if(opts.mSubscribeMask)
    {
        // Exact Flags match required.
        if ((opts.mSubscribeMask & opts.mSubscribeFilter) == (opts.mSubscribeMask & meta->mSubscribeFlags))
        {
                subscribeMatch = true;
        }
    }
    else
    {
        subscribeMatch = true;
    }

    return subscribeMatch;
}
bool RsGxsDataAccess::checkMsgFilter(const RsTokReqOptions& opts, const std::shared_ptr<RsGxsMsgMetaData> &meta ) const
{
	if (opts.mStatusMask)
	{
		// Exact Flags match required.
		if ( (opts.mStatusMask & opts.mStatusFilter) ==
		     (opts.mStatusMask & meta->mMsgStatus) )
		{
#ifdef DATA_DEBUG
            GXSDATADEBUG << __PRETTY_FUNCTION__
			          << " Continue checking Msg as StatusMatches: "
			          << " Mask: " << opts.mStatusMask
			          << " StatusFilter: " << opts.mStatusFilter
			          << " MsgStatus: " << meta->mMsgStatus
			          << " MsgId: " << meta->mMsgId << std::endl;
#endif
		}
		else
		{
#ifdef DATA_DEBUG
            GXSDATADEBUG << __PRETTY_FUNCTION__
			          << " Dropping Msg due to !StatusMatch "
			          << " Mask: " << opts.mStatusMask
			          << " StatusFilter: " << opts.mStatusFilter
			          << " MsgStatus: " << meta->mMsgStatus
			          << " MsgId: " << meta->mMsgId << std::endl;
#endif

			return false;
		}
	}
	else
	{
#ifdef DATA_DEBUG
        GXSDATADEBUG << __PRETTY_FUNCTION__
		          << " Status check not requested"
		          << " mStatusMask: " << opts.mStatusMask
		          << " MsgId: " << meta->mMsgId << std::endl;
#endif
	}

	if(opts.mMsgFlagMask)
	{
		// Exact Flags match required.
		if ( (opts.mMsgFlagMask & opts.mMsgFlagFilter) ==
		     (opts.mMsgFlagMask & meta->mMsgFlags) )
		{
#ifdef DATA_DEBUG
            GXSDATADEBUG << __PRETTY_FUNCTION__
			          << " Accepting Msg as FlagMatches: "
			          << " Mask: " << opts.mMsgFlagMask
			          << " FlagFilter: " << opts.mMsgFlagFilter
			          << " MsgFlag: " << meta->mMsgFlags
			          << " MsgId: " << meta->mMsgId << std::endl;
#endif
		}
		else
		{
#ifdef DATA_DEBUG
            GXSDATADEBUG << __PRETTY_FUNCTION__
			          << " Dropping Msg due to !FlagMatch "
			          << " Mask: " << opts.mMsgFlagMask
			          << " FlagFilter: " << opts.mMsgFlagFilter
			          << " MsgFlag: " << meta->mMsgFlags
			          << " MsgId: " << meta->mMsgId << std::endl;
#endif

			return false;
		}
	}
	else
	{
#ifdef DATA_DEBUG
        GXSDATADEBUG << __PRETTY_FUNCTION__
		          << " Flags check not requested"
		          << " mMsgFlagMask: " << opts.mMsgFlagMask
		          << " MsgId: " << meta->mMsgId << std::endl;
#endif
	}

	return true;
}

GxsGroupStatistic::~GxsGroupStatistic() = default;
GxsServiceStatistic::~GxsServiceStatistic() = default;
