/*
 * libretroshare/src/chat: distantchat.h
 *
 * Services for RetroShare.
 *
 * Copyright 2014 by Cyril Soler
 *
 * 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 "csoler@users.sourceforge.net".
 *
 */

#pragma once

#include <chat/rschatitems.h>
#include <retroshare/rsmsgs.h>
#include <retroshare/rsgxstunnel.h>

class RsGixs ;

static const uint32_t DISTANT_CHAT_AES_KEY_SIZE = 16 ;

class DistantChatService: public RsGxsTunnelService::RsGxsTunnelClientService
{
public:
    // So, public interface only uses DistandChatPeerId, but internally, this is converted into a RsGxsTunnelService::RsGxsTunnelId
    
   
    DistantChatService() : mDistantChatMtx("distant chat")
    {
        mGxsTunnels = NULL ;
        mDistantChatPermissions = RS_DISTANT_MESSAGING_CONTACT_PERMISSION_FLAG_FILTER_NONE ;	// default: accept everyone
    }

    virtual void triggerConfigSave()=0 ;
    bool processLoadListItem(const RsItem *item) ;
    void addToSaveList(std::list<RsItem*>& list) const;
    
    // Creates the invite if the public key of the distant peer is available.
    // Om success, stores the invite in the map above, so that we can respond to tunnel requests.
    //
    bool initiateDistantChatConnexion(const RsGxsId& to_gxs_id, const RsGxsId &from_gxs_id, DistantChatPeerId& dcpid, uint32_t &error_code) ;
    bool closeDistantChatConnexion(const DistantChatPeerId &tunnel_id) ;
    
    // Sets flags to only allow connexion from some people.
    
    uint32_t getDistantChatPermissionFlags() ;
    bool setDistantChatPermissionFlags(uint32_t flags) ;
    
    // Returns the status of a distant chat contact. The contact is defined by the tunnel id (turned into a DistantChatPeerId) because
    // each pair of talking GXS id needs to be treated separately
    
    virtual bool getDistantChatStatus(const DistantChatPeerId &tunnel_id, DistantChatPeerInfo& cinfo) ;

    // derived in p3ChatService, so as to pass down some info
    virtual void handleIncomingItem(RsItem *) = 0;
    virtual bool handleRecvChatMsgItem(RsChatMsgItem *ci)=0 ;

    bool handleOutgoingItem(RsChatItem *) ;
    bool handleRecvItem(RsChatItem *) ;
    void handleRecvChatStatusItem(RsChatStatusItem *cs) ;

private:
    struct DistantChatContact
    {
        RsGxsId from_id ;
        RsGxsId to_id ;
    };
    // This maps contains the current peers to talk to with distant chat.
    //
    std::map<DistantChatPeerId, DistantChatContact> 	mDistantChatContacts ;		// current peers we can talk to

    // Permission handling
    
    uint32_t mDistantChatPermissions ;

    // Overloaded from RsGxsTunnelClientService
    
public:
    virtual void connectToGxsTunnelService(RsGxsTunnelService *tunnel_service) ;
    
private:
    virtual bool acceptDataFromPeer(const RsGxsId& gxs_id) ;
    virtual void notifyTunnelStatus(const RsGxsTunnelService::RsGxsTunnelId& tunnel_id,uint32_t tunnel_status) ;
    virtual void receiveData(const RsGxsTunnelService::RsGxsTunnelId& id,unsigned char *data,uint32_t data_size) ;

    // Utility functions.
    
    void markDistantChatAsClosed(const DistantChatPeerId& dcpid) ;

    RsGxsTunnelService *mGxsTunnels ;
    RsMutex mDistantChatMtx ;
};