/*
 * libretroshare/src/gxs: rsdataservice.cc
 *
 * Data Access, interface for RetroShare.
 *
 * Copyright 2011-2011 by Evi-Parker Christopher
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License Version 2 as published by the Free Software Foundation.
 *
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 *
 * Please report all bugs and problems to "retroshare@lunamutt.com".
 *
 */


#include <fstream>

#include "rsdataservice.h"

#define MSG_TABLE_NAME std::string("MESSAGES")
#define GRP_TABLE_NAME std::string("GROUPS")


// generic
#define KEY_NXS_FILE std::string("nxsFile")
#define KEY_NXS_FILE_OFFSET std::string("fileOffset")
#define KEY_NXS_FILE_LEN std::string("nxsFileLen")
#define KEY_NXS_IDENTITY std::string("identity")
#define KEY_GRP_ID std::string("grpId")
#define KEY_ORIG_GRP_ID std::string("origGrpId")
#define KEY_IDENTITY_SIGN std::string("idSign")
#define KEY_TIME_STAMP std::string("timeStamp")
#define KEY_NXS_FLAGS std::string("flags")
#define KEY_NXS_META std::string("meta")
#define KEY_NXS_SERV_STRING std::string("serv_str");


// grp table columns
#define KEY_ADMIN_SIGN std::string("adminSign")
#define KEY_KEY_SET std::string("keySet")
#define KEY_GRP_NAME std::string("grpName")

// grp local
#define KEY_GRP_SUBCR_FLAG std::string("subscribeFlag")
#define KEY_GRP_POP std::string("popularity")
#define KEY_MSG_COUNT std::string("msgCount")
#define KEY_GRP_STATUS std::string("grpStatus")
#define KEY_GRP_LAST_POST std::string("lastPost")


// msg table columns
#define KEY_PUBLISH_SIGN std::string("publishSign")
#define KEY_MSG_ID std::string("msgId")
#define KEY_ORIG_MSG_ID std::string("origMsgId")
#define KEY_MSG_PARENT_ID std::string("parentId")
#define KEY_MSG_THREAD_ID std::string("threadId")
#define KEY_MSG_NAME std::string("msgName")

// msg local
#define KEY_MSG_STATUS std::string("msgStatus")
#define KEY_CHILD_TS std::string("childTs")




/*** actual data col numbers ***/

// generic
#define COL_ACT_GROUP_ID 0
#define COL_NXS_FILE 1
#define COL_NXS_FILE_OFFSET 2
#define COL_NXS_FILE_LEN 3
#define COL_META_DATA 4
#define COL_ACT_MSG_ID 5

/*** meta column numbers ***/

// grp col numbers

#define COL_ADMIN_SIGN 5
#define COL_KEY_SET 6
#define COL_GRP_SUBCR_FLAG 7
#define COL_GRP_POP 8
#define COL_MSG_COUNT 9
#define COL_GRP_STATUS 10
#define COL_GRP_NAME 11
#define COL_GRP_LAST_POST 12
#define COL_ORIG_GRP_ID 13

// msg col numbers
#define COL_PUBLISH_SIGN 5
#define COL_MSG_ID 6
#define COL_ORIG_MSG_ID 7
#define COL_MSG_STATUS 8
#define COL_CHILD_TS 9
#define COL_PARENT_ID 10
#define COL_THREAD_ID 11
#define COL_MSG_NAME 12

// generic meta shared col numbers
#define COL_GRP_ID 0
#define COL_TIME_STAMP 1
#define COL_NXS_FLAGS 2
#define COL_IDENTITY_SIGN 3
#define COL_IDENTITY 4

#define RS_DATA_SERVICE_DEBUG

RsDataService::RsDataService(const std::string &serviceDir, const std::string &dbName, uint16_t serviceType,
                             RsGxsSearchModule *mod)
    : RsGeneralDataService(), mServiceDir(serviceDir), mDbName(mServiceDir + "/" + dbName), mServType(serviceType){

    initialise();

    // for retrieving msg meta
    msgMetaColumns.push_back(KEY_GRP_ID); msgMetaColumns.push_back(KEY_TIME_STAMP); msgMetaColumns.push_back(KEY_NXS_FLAGS);
    msgMetaColumns.push_back(KEY_IDENTITY_SIGN); msgMetaColumns.push_back(KEY_NXS_IDENTITY); msgMetaColumns.push_back(KEY_PUBLISH_SIGN);
    msgMetaColumns.push_back(KEY_MSG_ID); msgMetaColumns.push_back(KEY_ORIG_MSG_ID); msgMetaColumns.push_back(KEY_MSG_STATUS);
    msgMetaColumns.push_back(KEY_CHILD_TS); msgMetaColumns.push_back(KEY_MSG_PARENT_ID); msgMetaColumns.push_back(KEY_MSG_THREAD_ID);
    msgMetaColumns.push_back(KEY_MSG_NAME);

    // for retrieving actual data
    msgColumns.push_back(KEY_GRP_ID);  msgColumns.push_back(KEY_NXS_FILE); msgColumns.push_back(KEY_NXS_FILE_OFFSET);
    msgColumns.push_back(KEY_NXS_FILE_LEN); msgColumns.push_back(KEY_NXS_META); msgColumns.push_back(KEY_MSG_ID);

    // for retrieving grp meta data
    grpMetaColumns.push_back(KEY_GRP_ID);  grpMetaColumns.push_back(KEY_TIME_STAMP); grpMetaColumns.push_back(KEY_NXS_FLAGS);
    grpMetaColumns.push_back(KEY_IDENTITY_SIGN); grpMetaColumns.push_back(KEY_NXS_IDENTITY); grpMetaColumns.push_back(KEY_ADMIN_SIGN);
    grpMetaColumns.push_back(KEY_KEY_SET); grpMetaColumns.push_back(KEY_GRP_SUBCR_FLAG); grpMetaColumns.push_back(KEY_GRP_POP);
    grpMetaColumns.push_back(KEY_MSG_COUNT); grpMetaColumns.push_back(KEY_GRP_STATUS); grpMetaColumns.push_back(KEY_GRP_NAME);
    grpMetaColumns.push_back(KEY_GRP_LAST_POST); grpMetaColumns.push_back(KEY_ORIG_GRP_ID);

    // for retrieving actual grp data
    grpColumns.push_back(KEY_GRP_ID); grpColumns.push_back(KEY_NXS_FILE); grpColumns.push_back(KEY_NXS_FILE_OFFSET);
    grpColumns.push_back(KEY_NXS_FILE_LEN); grpColumns.push_back(KEY_NXS_META);
}

RsDataService::~RsDataService(){
    mDb->closeDb();
    delete mDb;
}

void RsDataService::initialise(){

    // initialise database
    mDb = new RetroDb(mDbName, RetroDb::OPEN_READWRITE_CREATE);

    // create table for msg data
    mDb->execSQL("CREATE TABLE " + MSG_TABLE_NAME + "(" +
                 KEY_MSG_ID + " TEXT," +
                 KEY_GRP_ID +  " TEXT," +
                 KEY_NXS_FLAGS + " INT,"  +
                 KEY_ORIG_MSG_ID +  " TEXT," +
                 KEY_TIME_STAMP + " INT," +
                 KEY_PUBLISH_SIGN + " BLOB," +
                 KEY_NXS_IDENTITY + " TEXT," +
                 KEY_IDENTITY_SIGN + " BLOB," +
                 KEY_NXS_FILE + " TEXT,"+
                 KEY_NXS_FILE_OFFSET + " INT," +
                 KEY_MSG_STATUS + " INT," +
                 KEY_CHILD_TS + " INT," +
                 KEY_NXS_META + " BLOB," +
                 KEY_MSG_THREAD_ID + " TEXT," +
                 KEY_MSG_PARENT_ID + " TEXT,"+
                 KEY_MSG_NAME + " TEXT," +
                 KEY_NXS_FILE_LEN + " INT);");

    // create table for grp data
    mDb->execSQL("CREATE TABLE " + GRP_TABLE_NAME + "(" +
                 KEY_GRP_ID + " TEXT," +
                 KEY_TIME_STAMP + " INT," +
                 KEY_ADMIN_SIGN + " BLOB," + " BLOB," +
                 KEY_NXS_FILE + " TEXT," +
                 KEY_NXS_FILE_OFFSET + " INT," +
                 KEY_KEY_SET + " BLOB," +
                 KEY_NXS_FILE_LEN + " INT," +
                 KEY_NXS_META + " BLOB," +
                 KEY_GRP_NAME + " TEXT," +
                 KEY_GRP_LAST_POST + " INT," +
                 KEY_GRP_POP + " INT," +
                 KEY_MSG_COUNT + " INT," +
                 KEY_GRP_SUBCR_FLAG + " INT," +
                 KEY_GRP_STATUS + " INT," +
                 KEY_NXS_IDENTITY + " TEXT," +
                 KEY_ORIG_GRP_ID + " TEXT," +
                 KEY_NXS_FLAGS + " INT," +
                 KEY_IDENTITY_SIGN + " BLOB);");

}

RsGxsGrpMetaData* RsDataService::getGrpMeta(RetroCursor &c)
{
    RsGxsGrpMetaData* grpMeta = new RsGxsGrpMetaData();

    bool ok = true;

    // for extracting raw data
    uint32_t offset = 0;
    char* data = NULL;
    uint32_t data_len = 0;

    // grpId
    c.getString(COL_GRP_ID, grpMeta->mGroupId);

    // required definition of a group
    ok &= !grpMeta->mGroupId.empty();


    c.getString(COL_IDENTITY, grpMeta->mAuthorId);
    c.getString(COL_GRP_NAME, grpMeta->mGroupName);
    c.getString(COL_ORIG_GRP_ID, grpMeta->mOrigGrpId);

    grpMeta->mPublishTs = c.getInt32(COL_TIME_STAMP);
    grpMeta->mGroupFlags = c.getInt32(COL_NXS_FLAGS);

    // identity if any
    if(!grpMeta->mAuthorId.empty() && ok){
        offset = 0;
        data = (char*)c.getData(COL_IDENTITY_SIGN, data_len);
        if(data)
            grpMeta->idSign.GetTlv(data, data_len, &offset);
    }

    offset = 0;
    data = (char*)c.getData(COL_ADMIN_SIGN, data_len);
    if(data)
        grpMeta->adminSign.GetTlv(data, data_len, &offset);


    offset = 0; data = NULL; data_len = 0;
    data = (char*)c.getData(COL_KEY_SET, data_len);

    if(data)
        ok &= grpMeta->keys.GetTlv(data, data_len, &offset);

    // local meta
    grpMeta->mSubscribeFlags = c.getInt32(COL_GRP_SUBCR_FLAG);
    grpMeta->mPop = c.getInt32(COL_GRP_POP);
    grpMeta->mMsgCount = c.getInt32(COL_MSG_COUNT);
    grpMeta->mLastPost = c.getInt32(COL_GRP_LAST_POST);
    grpMeta->mGroupStatus = c.getInt32(COL_GRP_STATUS);


    if(ok)
        return grpMeta;
    else
        delete grpMeta;

    return NULL;
}

RsNxsGrp* RsDataService::getGroup(RetroCursor &c)
{
    /*!
     * grpId, pub admin and pub publish key
     * necessary for successful group
     */
    RsNxsGrp* grp = new RsNxsGrp(mServType);
    bool ok = true;

    // for manipulating raw data
    uint32_t offset = 0;
    char* data = NULL;
    uint32_t data_len = 0;

    // grpId
    c.getString(COL_ACT_GROUP_ID, grp->grpId);
    ok &= !grp->grpId.empty();

    offset = 0; data_len = 0;
    if(ok){

        data = (char*)c.getData(COL_META_DATA, data_len);
        if(data)
            grp->meta.GetTlv(data, data_len, &offset);
    }

    /* now retrieve grp data from file */
    std::string grpFile;
    c.getString(COL_NXS_FILE, grpFile);
    ok &= !grpFile.empty();

    if(ok){

        data_len = c.getInt32(COL_NXS_FILE_LEN);
        offset = c.getInt32(COL_NXS_FILE_OFFSET);

        char grp_data[data_len];
        std::ifstream istrm(grpFile.c_str(), std::ios::binary);
        istrm.seekg(offset, std::ios::beg);
        istrm.read(grp_data, data_len);

        istrm.close();
        offset = 0;
        ok &= grp->grp.GetTlv(grp_data, data_len, &offset);
    }

    if(ok)
        return grp;
    else
        delete grp;

    return NULL;
}

RsGxsMsgMetaData* RsDataService::getMsgMeta(RetroCursor &c)
{

    RsGxsMsgMetaData* msgMeta = new RsGxsMsgMetaData();

    bool ok = true;
    uint32_t data_len = 0,
    offset = 0;
    char* data = NULL;


    c.getString(COL_GRP_ID, msgMeta->mGroupId);
    c.getString(COL_MSG_ID, msgMeta->mMsgId);

    // without these, a msg is meaningless
    ok &= (!msgMeta->mGroupId.empty()) && (!msgMeta->mMsgId.empty());

    c.getString(COL_ORIG_MSG_ID, msgMeta->mOrigMsgId);
    c.getString(COL_IDENTITY, msgMeta->mAuthorId);
    c.getString(COL_MSG_NAME, msgMeta->mMsgName);

    if(!msgMeta->mAuthorId.empty()){
        offset = 0;
        data = (char*)c.getData(COL_IDENTITY_SIGN, data_len);
        msgMeta->idSign.GetTlv(data, data_len, &offset);
    }

    msgMeta->mMsgFlags = c.getInt32(COL_NXS_FLAGS);
    msgMeta->mPublishTs = c.getInt32(COL_TIME_STAMP);

    offset = 0; data_len = 0;

    if(ok){

        data = (char*)c.getData(COL_PUBLISH_SIGN, data_len);
        if(data)
            msgMeta->pubSign.GetTlv(data, data_len, &offset);

    }

    // thread and parent id
    c.getString(COL_THREAD_ID, msgMeta->mThreadId);
    c.getString(COL_PARENT_ID, msgMeta->mParentId);

    // local meta
    msgMeta->mMsgStatus = c.getInt32(COL_MSG_STATUS);
    msgMeta->mChildTs = c.getInt32(COL_CHILD_TS);

    if(ok)
        return msgMeta;
    else
        delete msgMeta;

    return NULL;
}



RsNxsMsg* RsDataService::getMessage(RetroCursor &c)
{

    RsNxsMsg* msg = new RsNxsMsg(mServType);

    bool ok = true;
    uint32_t data_len = 0,
    offset = 0;
    char* data = NULL;
    c.getString(COL_ACT_GROUP_ID, msg->grpId);
    c.getString(COL_ACT_MSG_ID, msg->msgId);

    ok &= (!msg->grpId.empty()) && (!msg->msgId.empty());

    offset = 0; data_len = 0;
    if(ok){

        data = (char*)c.getData(COL_META_DATA, data_len);
        if(data)
            msg->meta.GetTlv(data, data_len, &offset);
    }

    /* now retrieve grp data from file */
    std::string msgFile;
    c.getString(COL_NXS_FILE, msgFile);
    offset = c.getInt32(COL_NXS_FILE_OFFSET);
    data_len = c.getInt32(COL_NXS_FILE_LEN);
    ok &= !msgFile.empty();

    if(ok){

        char msg_data[data_len];
        std::ifstream istrm(msgFile.c_str(), std::ios::binary);
        istrm.seekg(offset, std::ios::beg);
        istrm.read(msg_data, data_len);

        istrm.close();
        offset = 0;
        ok &= msg->msg.GetTlv(msg_data, data_len, &offset);
    }

    if(ok)
        return msg;
    else
        delete msg;

    return NULL;
}

int RsDataService::storeMessage(std::map<RsNxsMsg *, RsGxsMsgMetaData *> &msg)
{
    std::map<RsNxsMsg*, RsGxsMsgMetaData* >::iterator mit = msg.begin();

    // start a transaction
    mDb->execSQL("BEGIN;");

    for(; mit != msg.end(); mit++){

        RsNxsMsg* msgPtr = mit->first;
        RsGxsMsgMetaData* msgMetaPtr = mit->second;

        // create or access file in binary
        std::string msgFile = mServiceDir + "/" + msgPtr->grpId + "-msgs";
        std::fstream ostrm(msgFile.c_str(), std::ios::binary | std::ios::app | std::ios::out);
        ostrm.seekg(0, std::ios::end); // go to end to append
        uint32_t offset = ostrm.tellg(); // get fill offset

        ContentValue cv;

        cv.put(KEY_NXS_FILE_OFFSET, (int32_t)offset);
        cv.put(KEY_NXS_FILE, msgFile);
        cv.put(KEY_NXS_FILE_LEN, (int32_t)msgPtr->msg.TlvSize());
        cv.put(KEY_MSG_ID, msgMetaPtr->mMsgId);
        cv.put(KEY_GRP_ID, msgMetaPtr->mGroupId);
        char pubSignData[msgMetaPtr->pubSign.TlvSize()];
        offset = 0;
        msgMetaPtr->pubSign.SetTlv(pubSignData, msgMetaPtr->pubSign.TlvSize(), &offset);
        cv.put(KEY_PUBLISH_SIGN, msgMetaPtr->pubSign.TlvSize(), pubSignData);


        if(! (msgMetaPtr->mAuthorId.empty()) ){
            char idSignData[msgMetaPtr->idSign.TlvSize()];
            offset = 0;
            msgMetaPtr->idSign.SetTlv(idSignData, msgMetaPtr->idSign.TlvSize(), &offset);
            cv.put(KEY_IDENTITY_SIGN, msgMetaPtr->idSign.TlvSize(), idSignData);
            cv.put(KEY_NXS_IDENTITY, msgMetaPtr->mAuthorId);
        }

        cv.put(KEY_NXS_FLAGS, (int32_t) msgMetaPtr->mMsgFlags);
        cv.put(KEY_TIME_STAMP, (int32_t) msgMetaPtr->mPublishTs);

        offset = 0;
        char metaData[msgPtr->meta.TlvSize()];
        msgPtr->meta.SetTlv(metaData, msgPtr->meta.TlvSize(), &offset);
        cv.put(KEY_NXS_META, msgPtr->meta.TlvSize(), metaData);

        cv.put(KEY_MSG_PARENT_ID, msgMetaPtr->mParentId);
        cv.put(KEY_MSG_THREAD_ID, msgMetaPtr->mThreadId);
        cv.put(KEY_ORIG_MSG_ID, msgMetaPtr->mOrigMsgId);
        cv.put(KEY_MSG_NAME, msgMetaPtr->mMsgName);

        // now local meta
        cv.put(KEY_MSG_STATUS, (int32_t)msgMetaPtr->mMsgStatus);
        cv.put(KEY_CHILD_TS, (int32_t)msgMetaPtr->mChildTs);

        offset = 0;
        char msgData[msgPtr->msg.TlvSize()];
        msgPtr->msg.SetTlv(msgData, msgPtr->msg.TlvSize(), &offset);
        ostrm.write(msgData, msgPtr->msg.TlvSize());
        ostrm.close();

        mDb->sqlInsert(MSG_TABLE_NAME, "", cv);
    }

    // finish transaction
    return mDb->execSQL("COMMIT;");
}


int RsDataService::storeGroup(std::map<RsNxsGrp *, RsGxsGrpMetaData *> &grp)
{
    std::map<RsNxsGrp*, RsGxsGrpMetaData* >::iterator sit = grp.begin();

    // begin transaction
    mDb->execSQL("BEGIN;");

    for(; sit != grp.end(); sit++){

        RsNxsGrp* grpPtr = sit->first;
        RsGxsGrpMetaData* grpMetaPtr = sit->second;

        std::string grpFile = mServiceDir + "/" + grpPtr->grpId;
        std::fstream ostrm(grpFile.c_str(), std::ios::binary | std::ios::app | std::ios::out);
        ostrm.seekg(0, std::ios::end); // go to end to append
        uint32_t offset = ostrm.tellg(); // get fill offset

        /*!
         * STORE file offset, file length, file name,
         * grpId, flags, publish time stamp, identity,
         * id signature, admin signatue, key set, last posting ts
         * and meta data
         **/
        ContentValue cv;
        cv.put(KEY_NXS_FILE_OFFSET, (int32_t)offset);
        cv.put(KEY_NXS_FILE_LEN, (int32_t)grpPtr->grp.TlvSize());
        cv.put(KEY_NXS_FILE, grpFile);
        cv.put(KEY_GRP_ID, grpPtr->grpId);
        cv.put(KEY_GRP_NAME, grpMetaPtr->mGroupName);
        cv.put(KEY_ORIG_GRP_ID, grpMetaPtr->mOrigGrpId);
        cv.put(KEY_NXS_FLAGS, (int32_t)grpMetaPtr->mGroupFlags);
        cv.put(KEY_TIME_STAMP, (int32_t)grpMetaPtr->mPublishTs);

        if(! (grpMetaPtr->mAuthorId.empty()) ){
            cv.put(KEY_NXS_IDENTITY, grpMetaPtr->mAuthorId);

            char idSignData[grpMetaPtr->idSign.TlvSize()];
            offset = 0;
            grpMetaPtr->idSign.SetTlv(idSignData, grpMetaPtr->idSign.TlvSize(), &offset);
            cv.put(KEY_IDENTITY_SIGN, grpMetaPtr->idSign.TlvSize(), idSignData);
            std::string wat(idSignData, grpMetaPtr->idSign.TlvSize());
            std::cerr << wat << std::endl;
        }

        char adminSignData[grpMetaPtr->adminSign.TlvSize()];
        offset = 0;
        grpMetaPtr->adminSign.SetTlv(adminSignData, grpMetaPtr->adminSign.TlvSize(), &offset);
        cv.put(KEY_ADMIN_SIGN, grpMetaPtr->adminSign.TlvSize(), adminSignData);

        offset = 0;
        char keySetData[grpMetaPtr->keys.TlvSize()];
        grpMetaPtr->keys.SetTlv(keySetData, grpMetaPtr->keys.TlvSize(), &offset);
        cv.put(KEY_KEY_SET, grpMetaPtr->keys.TlvSize(), keySetData);

        offset = 0;
        char metaData[grpPtr->meta.TlvSize()];
        grpPtr->meta.SetTlv(metaData, grpPtr->meta.TlvSize(), &offset);
        cv.put(KEY_NXS_META, grpPtr->meta.TlvSize(), metaData);

        // local meta data
        cv.put(KEY_GRP_SUBCR_FLAG, (int32_t)grpMetaPtr->mSubscribeFlags);
        cv.put(KEY_GRP_POP, (int32_t)grpMetaPtr->mPop);
        cv.put(KEY_MSG_COUNT, (int32_t)grpMetaPtr->mMsgCount);
        cv.put(KEY_GRP_STATUS, (int32_t)grpMetaPtr->mGroupStatus);
        cv.put(KEY_GRP_LAST_POST, (int32_t)grpMetaPtr->mLastPost);

        offset = 0;
        char grpData[grpPtr->grp.TlvSize()];
        grpPtr->grp.SetTlv(grpData, grpPtr->grp.TlvSize(), &offset);
        ostrm.write(grpData, grpPtr->grp.TlvSize());
        ostrm.close();

        mDb->sqlInsert(GRP_TABLE_NAME, "", cv);
    }
    // finish transaction
    return mDb->execSQL("COMMIT;");
}

int RsDataService::retrieveNxsGrps(std::map<std::string, RsNxsGrp *> &grp, bool withMeta, bool cache){

	if(grp.empty()){

		RetroCursor* c = mDb->sqlQuery(GRP_TABLE_NAME, grpColumns, "", "");

		if(c)
		{
			std::vector<RsNxsGrp*> grps;

			retrieveGroups(c, grps, withMeta);
			std::vector<RsNxsGrp*>::iterator vit = grps.begin();

			for(; vit != grps.end(); vit++)
			{
				grp[(*vit)->grpId] = *vit;
			}

			delete c;
		}

	}else{

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

		for(; mit != grp.end(); mit++)
		{
			const std::string& grpId = mit->first;
			RetroCursor* c = mDb->sqlQuery(GRP_TABLE_NAME, grpColumns, "grpId='" + grpId + "'", "");

			if(c)
			{
				std::vector<RsNxsGrp*> grps;
				retrieveGroups(c, grps);

				if(!grps.empty())
				{
					RsNxsGrp* ng = grps.front();
					grp[ng->grpId] = ng;
				}else{
					grp.erase(grpId);
				}

				delete c;
			}
		}
	}

	return 1;
}

void RsDataService::retrieveGroups(RetroCursor* c, std::vector<RsNxsGrp*>& grps, bool withMeta){

    if(c){
        bool valid = c->moveToFirst();

        while(valid){
            RsNxsGrp* g = getGroup(*c);

            // only add the latest grp info
            if(g)
            {
            	RsGxsGrpMetaData* meta;

            	if(withMeta)
            		meta = getGrpMeta(*c);

            	if(meta) g->metaData = meta;
                grps.push_back(g);
            }
            valid = c->moveToNext();
        }
    }
}

int RsDataService::retrieveNxsMsgs(const GxsMsgReq &reqIds, GxsMsgResult &msg, bool cache)
{

    GxsMsgReq::const_iterator mit = reqIds.begin();

    for(; mit != reqIds.end(); mit++)
    {

        const std::string& grpId = mit->first;

        // if vector empty then request all messages
        const std::vector<std::string>& msgIdV = mit->second;
        std::vector<RsNxsMsg*> msgSet;

        if(msgIdV.empty()){
            RetroCursor* c = mDb->sqlQuery(MSG_TABLE_NAME, msgColumns, KEY_GRP_ID+ "='" + grpId + "'", "");

            if(c)
                retrieveMessages(c, msgSet);

            delete c;
        }else{

            // request each grp
            std::vector<std::string>::const_iterator sit = msgIdV.begin();

            for(; sit!=msgIdV.end();sit++){
                const std::string& msgId = *sit;
                RetroCursor* c = mDb->sqlQuery(MSG_TABLE_NAME, msgColumns, KEY_GRP_ID+ "='" + grpId
                                               + "' AND " + KEY_MSG_ID + "='" + msgId + "'", "");

                if(c)
                    retrieveMessages(c, msgSet);

                delete c;
            }
        }

        msg[grpId] = msgSet;
        msgSet.clear();
    }
}

void RsDataService::retrieveMessages(RetroCursor *c, std::vector<RsNxsMsg *> &msgs)
{
    bool valid = c->moveToFirst();
    while(valid){
        RsNxsMsg* m = getMessage(*c);

        if(m){
            msgs.push_back(m);;
        }else{
            delete m;
        }

        valid = c->moveToNext();
    }
    return;
}

int RsDataService::retrieveGxsMsgMetaData(const std::vector<std::string> &grpIds, GxsMsgMetaResult &msgMeta)
{
    std::vector<std::string>::const_iterator vit = grpIds.begin();

    for(; vit != grpIds.end(); vit++)
    {
        const std::string& grpId = *vit;

        std::vector<RsGxsMsgMetaData*> meta;

        RetroCursor* c = mDb->sqlQuery(MSG_TABLE_NAME, msgMetaColumns, "", KEY_GRP_ID+ "='" + grpId + "'");

        if(c)
        {
            bool valid = c->moveToFirst();
            while(valid){
                RsGxsMsgMetaData* m = getMsgMeta(*c);

                if(m){
                    meta.push_back(m);
                }else{
                    delete m;
                }
                valid = c->moveToNext();
            }

            msgMeta[grpId] = meta;
        }
        delete c;

    }
    return 1;
}

int RsDataService::retrieveGxsGrpMetaData(std::map<std::string, RsGxsGrpMetaData *>& grp)
{
    RetroCursor* c = mDb->sqlQuery(GRP_TABLE_NAME, grpMetaColumns, "", "");

    if(c)
    {
        bool valid = c->moveToFirst();

        while(valid)
        {
            RsGxsGrpMetaData* g = getGrpMeta(*c);

            if(g)
            {
                grp[g->mGroupId] = g;
            }
            valid = c->moveToNext();
        }
    }
    delete c;

    return 1;
}

int RsDataService::resetDataStore()
{

#ifdef RS_DATA_SERVICE_DEBUG
    std::cerr << "resetDataStore() " << std::endl;
#endif

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

    retrieveNxsGrps(grps, false, false);
    std::map<std::string, RsNxsGrp*>::iterator mit
            = grps.begin();

    // remove all grp msgs files from service dir
    for(; mit != grps.end(); mit++){
        std::string file = mServiceDir + "/" + mit->first;
        std::string msgFile = file + "-msgs";
        remove(file.c_str()); // remove group file
        remove(msgFile.c_str()); // and remove messages file
    }

    mDb->closeDb();
    remove(mDbName.c_str()); // remove db file

    // recreate database
    initialise();

    return 1;
}

int RsDataService::removeGroups(const std::vector<std::string> &grpIds)
{

    return 0;
}

int RsDataService::updateGroupMetaData(GrpLocMetaData *meta)
{
    return 0;
}

int RsDataService::updateMessageMetaData(MsgLocMetaData *metaData)
{
    return 0;
}


int RsDataService::removeMsgs(const GxsMsgReq& msgIds)
{
    return 0;
}

uint32_t RsDataService::cacheSize() const {
    return 0;
}

int RsDataService::setCacheSize(uint32_t size)
{
    return 0;
}