#ifndef RSNXSITEMS_H
#define RSNXSITEMS_H

/*
 * libretroshare/src/serialiser: rsnxssitems.h
 *
 * RetroShare Serialiser.
 *
 * Copyright 2012 Christopher Evi-Parker, Robert Fernie.
 *
 * 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 <map>
#include <openssl/ssl.h>

#include "rsitems/rsserviceids.h"
#include "rsitems/itempriorities.h"
#include "serialiser/rsserial.h"
#include "serialiser/rstlvbase.h"
#include "serialiser/rstlvitem.h"
#include "serialiser/rstlvkeys.h"
#include "gxs/rsgxsdata.h"

// These items have "flag type" numbers, but this is not used.

const uint8_t RS_PKT_SUBTYPE_NXS_SYNC_GRP_REQ_ITEM    = 0x01;
const uint8_t RS_PKT_SUBTYPE_NXS_SYNC_GRP_ITEM        = 0x02;
const uint8_t RS_PKT_SUBTYPE_NXS_SYNC_GRP_STATS_ITEM  = 0x03;
const uint8_t RS_PKT_SUBTYPE_NXS_GRP_ITEM             = 0x04;
const uint8_t RS_PKT_SUBTYPE_NXS_ENCRYPTED_DATA_ITEM  = 0x05;
const uint8_t RS_PKT_SUBTYPE_NXS_SESSION_KEY_ITEM     = 0x06;
const uint8_t RS_PKT_SUBTYPE_NXS_SYNC_MSG_ITEM        = 0x08;
const uint8_t RS_PKT_SUBTYPE_NXS_SYNC_MSG_REQ_ITEM    = 0x10;
const uint8_t RS_PKT_SUBTYPE_NXS_MSG_ITEM             = 0x20;
const uint8_t RS_PKT_SUBTYPE_NXS_TRANSAC_ITEM         = 0x40;
const uint8_t RS_PKT_SUBTYPE_NXS_GRP_PUBLISH_KEY_ITEM = 0x80;

// possibility create second service to deal with this functionality

const uint8_t RS_PKT_SUBTYPE_EXT_SEARCH_GRP   = 0x0001;
const uint8_t RS_PKT_SUBTYPE_EXT_SEARCH_MSG   = 0x0002;
const uint8_t RS_PKT_SUBTYPE_EXT_DELETE_GRP   = 0x0004;
const uint8_t RS_PKT_SUBTYPE_EXT_DELETE_MSG   = 0x0008;
const uint8_t RS_PKT_SUBTYPE_EXT_SEARCH_REQ   = 0x0010;


/*!
 * Base class for Network exchange service
 * Main purpose is for rtti based routing used in the
 * serialisation and deserialisation of NXS packets
 *
 * Service type is set by plugin service
 */
class RsNxsItem : public RsItem
{

public:
    RsNxsItem(uint16_t servtype, uint8_t subtype)
        : RsItem(RS_PKT_VERSION_SERVICE, servtype, subtype), transactionNumber(0)
    {
        setPriorityLevel(QOS_PRIORITY_RS_GXS_NET);
        return;
    }
    virtual ~RsNxsItem(){}
   
    virtual bool serialise(void *data,uint32_t& size) const = 0 ;	
    virtual uint32_t serial_size() const = 0 ; 			
    virtual void clear() = 0;
    virtual std::ostream &print(std::ostream &out, uint16_t indent = 0) = 0;

    bool serialise_header(void *data,uint32_t& pktsize,uint32_t& tlvsize, uint32_t& offset) const;

    uint32_t transactionNumber; // set to zero if this is not a transaction item
};


/*!
 * Use to request grp list from peer
 * Server may advise client peer to use sync file
 * while serving his request. This results
 */
class RsNxsSyncGrpReqItem : public RsNxsItem 
{
public:

	static const uint8_t FLAG_USE_SYNC_HASH;
	static const uint8_t FLAG_ONLY_CURRENT; // only send most current version of grps / ignores sync hash

	RsNxsSyncGrpReqItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_SYNC_GRP_REQ_ITEM) { clear(); return;}

	virtual void clear();
	virtual std::ostream &print(std::ostream &out, uint16_t indent);

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const ; 			
        
	uint8_t flag; // advises whether to use sync hash
	uint32_t createdSince; // how far back to sync data
	uint32_t updateTS; // time of last group update
	std::string syncHash; // use to determine if changes that have occured since last hash
};

/*!
 * Use to request statistics about a particular group
 */
class RsNxsSyncGrpStatsItem : public RsNxsItem 
{
public:

    RsNxsSyncGrpStatsItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_SYNC_GRP_STATS_ITEM) {}

    virtual void clear() {}
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    virtual bool serialise(void *data,uint32_t& size) const;	
    virtual uint32_t serial_size() const ; 			
        
    static const uint8_t GROUP_INFO_TYPE_REQUEST  = 0x01;
    static const uint8_t GROUP_INFO_TYPE_RESPONSE = 0x02; 
    
    uint32_t request_type;	// used to determine the type of request
    RsGxsGroupId grpId;		// id of the group
    uint32_t number_of_posts;	// number of posts in that group
    uint32_t last_post_TS; 	// time_stamp of last post
};

/*!
 * Use to request grp list from peer
 * Server may advise client peer to use sync file
 * while serving his request. This results
 */
class RsNxsGroupPublishKeyItem : public RsNxsItem
{
public:
    RsNxsGroupPublishKeyItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_GRP_PUBLISH_KEY_ITEM) { clear(); return;}

    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    RsGxsGroupId grpId ;
    RsTlvPrivateRSAKey private_key ;
};



/*!
 * This RsNxsItem is for use in enabling transactions
 * in order to guaranttee a collection of item have been
 * received
 */
class RsNxsTransacItem: public RsNxsItem {

public:

    static const uint16_t FLAG_STATE_MASK = 0xff;
    static const uint16_t FLAG_TYPE_MASK = 0xff00;

    /** transaction state **/
    static const uint16_t FLAG_BEGIN_P1;
    static const uint16_t FLAG_BEGIN_P2;
    static const uint16_t FLAG_END_SUCCESS;
    static const uint16_t FLAG_CANCEL;
    static const uint16_t FLAG_END_FAIL_NUM;
    static const uint16_t FLAG_END_FAIL_TIMEOUT;
    static const uint16_t FLAG_END_FAIL_FULL;


    /** transaction type **/
    static const uint16_t FLAG_TYPE_GRP_LIST_RESP;
    static const uint16_t FLAG_TYPE_MSG_LIST_RESP;
    static const uint16_t FLAG_TYPE_GRP_LIST_REQ;
    static const uint16_t FLAG_TYPE_MSG_LIST_REQ;
    static const uint16_t FLAG_TYPE_GRPS;
    static const uint16_t FLAG_TYPE_MSGS;
    static const uint16_t FLAG_TYPE_ENCRYPTED_DATA;

    RsNxsTransacItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_TRANSAC_ITEM) { clear(); return; }
    virtual ~RsNxsTransacItem() { return ; }

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const ; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    uint16_t transactFlag;
    uint32_t nItems;
    uint32_t updateTS;

    // not serialised
    uint32_t timestamp;
};

/*!
 * Use to send to peer list of grps
 * held by server peer
 */
class RsNxsSyncGrpItem: public RsNxsItem
{

public:

    static const uint8_t FLAG_REQUEST;
    static const uint8_t FLAG_RESPONSE;
    static const uint8_t FLAG_USE_SYNC_HASH;

    RsNxsSyncGrpItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_SYNC_GRP_ITEM) { clear(); return ; }
    virtual ~RsNxsSyncGrpItem() { return; }

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);


    uint8_t flag; // request or response

    uint32_t publishTs; // to compare to Ts of receiving peer's grp of same id

    /// grpId of grp held by sending peer
    RsGxsGroupId grpId;
    RsGxsId authorId;

};

/*!
 * Use to send to peer list of grps
 * held by server peer
 */
class RsNxsSessionKeyItem : public RsNxsItem
{

public:

    RsNxsSessionKeyItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_SESSION_KEY_ITEM) { clear(); }
    virtual ~RsNxsSessionKeyItem() {}

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    /// Session key encrypted for the whole group
    /// 
    uint8_t iv[EVP_MAX_IV_LENGTH] ;					// initialisation vector
    std::map<RsGxsId, RsTlvBinaryData> encrypted_session_keys;	// encrypted session keys
};
/*!
 * Use to send to peer list of grps
 * held by server peer
 */
class RsNxsEncryptedDataItem : public RsNxsItem
{

public:

    RsNxsEncryptedDataItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_ENCRYPTED_DATA_ITEM),encrypted_data(servtype) 
    { 
	encrypted_data.tlvtype = TLV_TYPE_BIN_ENCRYPTED ;
	clear(); 
    }
    virtual ~RsNxsEncryptedDataItem() {}

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    /// grpId of grp held by sending peer
    /// 
    RsTlvBinaryData encrypted_data ;
};


/*!
 * Contains serialised group items
 * Each item corresponds to a group which needs to be
 * deserialised
 */
class RsNxsGrp : public RsNxsItem
{

public:

    RsNxsGrp(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_GRP_ITEM), grp(servtype), meta(servtype),
    metaData(NULL) { clear();
    //std::cout << "\nGrp refcount++ : " << ++refcount << std::endl;
    return; }
    virtual ~RsNxsGrp() { if(metaData) delete metaData;
    //std::cout << "\nGrp refcount-- : " << --refcount << std::endl;
    }

    RsNxsGrp* clone() const;

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    RsGxsGroupId grpId; /// group Id, needed to complete version Id (ncvi)
    static int refcount;
    RsTlvBinaryData grp; /// actual group data
    uint8_t pos; /// used for splitting up grp
    uint8_t count; /// number of split up messages

    /*!
     * This should contains all data
     * which is not specific to the Gxs service data
     */
    // This is the binary data for the group meta that is sent to friends. It *should not* contain any private
    // key parts. This is ensured in RsGenExchange
    
    RsTlvBinaryData meta;

    // Deserialised metaData, this is not serialised by the serialize() method. So it may contain private key parts in some cases.
    RsGxsGrpMetaData* metaData;
};

/*!
 * Use to request list of msg held by peer
 * for a given group
 */
class RsNxsSyncMsgReqItem : public RsNxsItem
{

public:
 
#ifdef UNUSED_CODE
    static const uint8_t FLAG_USE_SYNC_HASH;
#endif
    static const uint8_t FLAG_USE_HASHED_GROUP_ID;

    RsNxsSyncMsgReqItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_SYNC_MSG_REQ_ITEM) { clear(); return; }

    virtual bool serialise(void *data,uint32_t& size) const;	
    virtual uint32_t serial_size() const; 			

    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    RsGxsGroupId grpId;
    uint8_t flag;
    uint32_t createdSinceTS;
    uint32_t updateTS; // time of last update
    std::string syncHash;
};

/*!
 * Use to send list msgs for a group held by
 * a peer
 */
class RsNxsSyncMsgItem : public RsNxsItem
{
public:

    static const uint8_t FLAG_REQUEST;
    static const uint8_t FLAG_RESPONSE;
    static const uint8_t FLAG_USE_SYNC_HASH;
    RsNxsSyncMsgItem(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_SYNC_MSG_ITEM) { clear(); return; }

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    uint8_t flag; // response/req
    RsGxsGroupId grpId;
    RsGxsMessageId msgId;
    RsGxsId authorId;

};


/*!
 * Used to respond to a RsGrpMsgsReq
 * with message items satisfying request
 */
class RsNxsMsg : public RsNxsItem
{
public:

    RsNxsMsg(uint16_t servtype) : RsNxsItem(servtype, RS_PKT_SUBTYPE_NXS_MSG_ITEM), meta(servtype), msg(servtype),
    metaData(NULL) {
    //	std::cout << "\nrefcount++ : " << ++refcount << std::endl;
    	clear(); return;
    }
    virtual ~RsNxsMsg()
    {
    	//std::cout << "\nrefcount-- : " << --refcount << std::endl;
    	if(metaData){
    		//std::cout << "\ndeleted\n";
    		delete metaData;
    	}
    }

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear();
    virtual std::ostream &print(std::ostream &out, uint16_t indent);

    uint8_t pos; /// used for splitting up msg
    uint8_t count; /// number of split up messages
    RsGxsGroupId grpId; /// group id, forms part of version id
    RsGxsMessageId msgId; /// msg id
    static int refcount;

    /*!
     * This should contains all the data
     * which is not specific to the Gxs service data
     */
    RsTlvBinaryData meta;

    /*!
     * This contains Gxs specific data
     * only client of API knows who to decode this
     */
    RsTlvBinaryData msg;

    RsGxsMsgMetaData* metaData;

};

/*!
 * Used to request a search of user data
 */
class RsNxsSearchReqItem : public RsNxsItem
{
public:

    RsNxsSearchReqItem(uint16_t servtype): RsNxsItem(servtype, RS_PKT_SUBTYPE_EXT_SEARCH_REQ), serviceSearchItem(servtype) { return; }
    virtual ~RsNxsSearchReqItem() { return;}

	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    virtual void clear() { return;}
    virtual std::ostream &print(std::ostream &out, uint16_t /*indent*/) { return out; }

    uint8_t nHops; /// how many peers to jump to
    uint32_t token; // search token
    RsTlvBinaryData serviceSearchItem; // service aware of item class
    uint32_t expiration; // expiration date
};


/*!
 * Used to respond to a RsGrpSearchReq
 * with grpId/MsgIds that satisfy search request
 */
class RsNxsSearchResultMsgItem
{
public:

    RsNxsSearchResultMsgItem() : context(0) { return;}
    
	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    void clear() {}
    std::ostream &print(std::ostream &out, uint16_t /*indent*/) { return out; }

    uint32_t token; // search token to be redeemed
    RsTlvBinaryData context; // used by client service
    std::string msgId;
    std::string grpId;
    RsTlvKeySignature idSign;

    uint32_t expiration; // expiration date
};

/*!
 * Used to respond to a RsGrpSearchReq
 * with grpId/MsgIds that satisfy search request
 */
class RsNxsSearchResultGrpItem
{
public:

    RsNxsSearchResultGrpItem();
    
	virtual bool serialise(void *data,uint32_t& size) const;	
	virtual uint32_t serial_size() const; 			
        
    void clear() {}
    std::ostream &print(std::ostream &out, uint16_t /*indent*/) { return out; }

    uint32_t token; // search token to be redeemed

    RsTlvBinaryData context; // used by client service

    std::string grpId;
    RsTlvKeySignature adminSign;

    uint32_t expiration; // expiration date
};


#ifndef UNUSED_CODE
class RsNxsDeleteMsg
{
public:

    RsNxsDeleteMsg() { return; }

    std::string msgId;
    std::string grpId;
    RsTlvKeySignature deleteSign; // ( msgId + grpId + msg data ) sign //TODO: add warning not to place msgId+grpId in msg!

};

class RsNxsDeleteGrp
{
public:

    RsNxsDeleteGrp() { return;}

    std::string grpId;
    RsTlvKeySignature idSign;
    RsTlvKeySignature deleteSign; // (grpId + grp data) sign // TODO: add warning not to place grpId in msg
};
#endif


class RsNxsSerialiser : public RsSerialType
{
public:

    RsNxsSerialiser(uint16_t servtype) :
            RsSerialType(RS_PKT_VERSION_SERVICE, servtype), SERVICE_TYPE(servtype) { return; }

    virtual ~RsNxsSerialiser() { return; }

    virtual uint32_t size(RsItem *item);
    virtual bool serialise(RsItem *item, void *data, uint32_t *size);
    virtual RsItem* deserialise(void *data, uint32_t *size);

private:
    RsNxsSyncGrpReqItem      *deserialNxsSyncGrpReqItem(void *data, uint32_t *size);      /* RS_PKT_SUBTYPE_SYNC_GRP */
    RsNxsSyncGrpItem         *deserialNxsSyncGrpItem(void *data, uint32_t *size);         /* RS_PKT_SUBTYPE_SYNC_GRP_ITEM */
    RsNxsSyncMsgReqItem      *deserialNxsSyncMsgReqItem(void *data, uint32_t *size);      /* RS_PKT_SUBTYPE_SYNC_MSG */
    RsNxsSyncMsgItem         *deserialNxsSyncMsgItem(void *data, uint32_t *size);         /* RS_PKT_SUBTYPE_SYNC_MSG_ITEM */
    RsNxsGrp                 *deserialNxsGrpItem(void *data, uint32_t *size);             /* RS_PKT_SUBTYPE_NXS_GRP */
    RsNxsMsg                 *deserialNxsMsgItem(void *data, uint32_t *size);             /* RS_PKT_SUBTYPE_NXS_MSG */
    RsNxsTransacItem         *deserialNxsTransacItem(void* data, uint32_t *size);         /* RS_PKT_SUBTYPE_NXS_TRANS */
    RsNxsGroupPublishKeyItem *deserialNxsGroupPublishKeyItem(void* data, uint32_t *size); /* RS_PKT_SUBTYPE_NXS_GRP_PUBLISH_KEY */
    RsNxsSessionKeyItem      *deserialNxsSessionKeyItem(void* data, uint32_t *size);      /* RS_PKT_SUBTYPE_NXS_SESSION_KEY_ITEM */
    RsNxsEncryptedDataItem   *deserialNxsEncryptedDataItem(void* data, uint32_t *size);   /* RS_PKT_SUBTYPE_NXS_ENCRYPTED_DATA_ITEM */
    RsNxsSyncGrpStatsItem    *deserialNxsSyncGrpStatsItem(void* data, uint32_t *size);    /* RS_PKT_SUBTYPE_NXS_SYNC_GRP_STATS_ITEM */

    bool checkItemHeader(void *data, uint32_t *size, uint8_t subservice_type);
    
    const uint16_t SERVICE_TYPE;
};


#endif // RSNXSITEMS_H