/***************************************************************************
 *   Copyright (C) 2009 by Joris Guisson                                   *
 *   joris.guisson@gmail.com                                               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 ***************************************************************************/

#ifndef BT_PEERPROTOCOLEXTENSION_H
#define BT_PEERPROTOCOLEXTENSION_H

#include <ktorrent_export.h>
#include <util/constants.h>

namespace bt
{
class Peer;

const Uint32 UT_PEX_ID = 1;
const Uint32 UT_METADATA_ID = 2;

/**
    Base class for protocol extensions
*/
class KTORRENT_EXPORT PeerProtocolExtension
{
public:
    PeerProtocolExtension(bt::Uint32 id, Peer* peer);
    virtual ~PeerProtocolExtension();

    /// Virtual update function does nothing, needs to be overridden if update
    virtual void update();

    /// Does this needs to be update
    virtual bool needsUpdate() const
    {
        return false;
    }

    /// Handle a packet
    virtual void handlePacket(const bt::Uint8* packet, Uint32 size) = 0;

    /// Send an extension protocol packet
    void sendPacket(const QByteArray & data);

    /// Change the ID
    void changeID(Uint32 id);

protected:
    bt::Uint32 id;
    Peer* peer;
};

}

#endif // BT_PEERPROTOCOLEXTENSION_H
