/*
Copyright (C) 2010 Srivats P.

This file is part of "Ostinato"

This 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 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>
*/

#ifndef _COMBO_PROTOCOL_H
#define _COMBO_PROTOCOL_H

#include "abstractprotocol.h"

template <int protoNumber, class ProtoA, class ProtoB>
class ComboProtocol : public AbstractProtocol
{
public:
    ComboProtocol(StreamBase *stream, AbstractProtocol *parent = 0)
        : AbstractProtocol(stream, parent)
    {
        protoA = new ProtoA(stream, this);
        protoB = new ProtoB(stream, this);
        protoA->next = protoB;
        protoB->prev = protoA;

        qDebug("%s: protoNumber = %d, %p <--> %p", __FUNCTION__,
            protoNumber, protoA, protoB);

        if (protoA->protocolNumber() == protoB->protocolNumber())
            fieldPrefix = OuterInnerPrefix;
        else if (similarProto())
            fieldPrefix = ProtoNamePrefix;

    }

    virtual ~ComboProtocol()
    {
        delete protoA;
        delete protoB;
    }

    static ComboProtocol* createInstance(StreamBase *stream,
        AbstractProtocol *parent)
    {
        return new ComboProtocol<protoNumber, ProtoA, ProtoB>(stream, parent);
    }

    virtual quint32 protocolNumber() const
    {
        return protoNumber;
    }

    virtual void protoDataCopyInto(OstProto::Protocol &protocol) const
    {
        protoA->protoDataCopyInto(protocol);
        protoB->protoDataCopyInto(protocol);
        protocol.mutable_protocol_id()->set_id(protocolNumber());
    }

    virtual void protoDataCopyFrom(const OstProto::Protocol &protocol)
    {
        if (protocol.protocol_id().id() == protocolNumber())
        {
            OstProto::Protocol    proto;

            // NOTE: To use protoX->protoDataCopyFrom() we need to arrange
            // so that it sees its own protocolNumber() - but since the
            // input param 'protocol' is 'const', we work on a copy
            proto.CopyFrom(protocol);

            proto.mutable_protocol_id()->set_id(protoA->protocolNumber());
            protoA->protoDataCopyFrom(proto);

            proto.mutable_protocol_id()->set_id(protoB->protocolNumber());
            protoB->protoDataCopyFrom(proto);
        }
    }

    virtual QString name() const
    {
        return protoA->name() + "/" + protoB->name();
    }
    virtual QString shortName() const
    {
        return protoA->shortName() + "/" + protoB->shortName();
    }

    virtual ProtocolIdType protocolIdType() const
    {
        return protoB->protocolIdType();
    }

    virtual quint32 protocolId(ProtocolIdType type) const
    {
        return protoA->protocolId(type);
    }
    //quint32 payloadProtocolId(ProtocolIdType type) const;

    virtual int    fieldCount() const
    {
        return protoA->fieldCount() + protoB->fieldCount();
    }
    //virtual int    metaFieldCount() const;
    //int    frameFieldCount() const;

    virtual FieldFlags fieldFlags(int index) const
    {
        int cnt = protoA->fieldCount();

        if (index < cnt)
            return protoA->fieldFlags(index);
        else
            return protoB->fieldFlags(index - cnt);
    }
    virtual QVariant fieldData(int index, FieldAttrib attrib,
        int streamIndex = 0) const
    {
        int cnt = protoA->fieldCount();
        QVariant value = index < cnt ?
            protoA->fieldData(index, attrib, streamIndex) :
            protoB->fieldData(index - cnt, attrib, streamIndex);

        if (attrib == FieldName) {
            switch (fieldPrefix) {
            case OuterInnerPrefix:
                value = QString("%1 %2")
                    .arg(index < cnt ? QString("Outer") : QString("Inner"))
                    .arg(value.toString());
                break;
            case ProtoNamePrefix:
                value = QString("%1 %2")
                    .arg(index < cnt ? protoA->shortName() : protoB->shortName())
                    .arg(value.toString());
                break;
            case NoPrefix:
                // Fall-through
                break;
            }
        }

        return value;
    }
    virtual bool setFieldData(int index, const QVariant &value, 
        FieldAttrib attrib = FieldValue)
    {
        int cnt = protoA->fieldCount();

        if (index < cnt)
            return protoA->setFieldData(index, value, attrib);
        else
            return protoB->setFieldData(index - cnt, value, attrib);
    }

#if 0
    QByteArray protocolFrameValue(int streamIndex = 0,
        bool forCksum = false) const;
    virtual int protocolFrameSize() const;
    int protocolFrameOffset() const;
    int protocolFramePayloadSize() const;
#endif

    virtual bool isProtocolFrameSizeVariable() const
    {
        return (protoA->isProtocolFrameSizeVariable()
            || protoB->isProtocolFrameSizeVariable());
    }
    virtual int protocolFrameVariableCount() const
    {
        int count = AbstractProtocol::protocolFrameVariableCount();
        count = AbstractProtocol::lcm(
                        count,
                        protoA->protocolFrameVariableCount());
        count = AbstractProtocol::lcm(
                        count,
                        protoB->protocolFrameVariableCount());
        return count;
    }

    virtual quint32 protocolFrameCksum(int streamIndex = 0,
        CksumType cksumType = CksumIp, CksumFlags cksumFlags = 0) const
    {
        // For a Pseudo IP cksum, we assume it is the succeeding protocol
        // that is requesting it and hence return protoB's cksum;
        if (cksumType == CksumIpPseudo)
            return protoB->protocolFrameCksum(
                                streamIndex,cksumType, cksumFlags);

        return AbstractProtocol::protocolFrameCksum(
                                streamIndex, cksumType, cksumFlags);
    }
#if 0
    quint32 protocolFrameHeaderCksum(int streamIndex = 0,
        CksumType cksumType = CksumIp) const;
    quint32 protocolFramePayloadCksum(int streamIndex = 0,
        CksumType cksumType = CksumIp) const;
#endif
    template <int protocolNumber, class FormA, class FormB, class ProtocolA, class ProtocolB> friend class ComboProtocolConfigForm;

protected:
    ProtoA    *protoA;
    ProtoB    *protoB;

private:
    bool similarProto()
    {
        // TODO: Use Levenshtein distance or something similar with > 70% match
        // For now we use an ugly hack!
        if (protoA->shortName().contains("IPv")
            && protoB->shortName().contains("IPv"))
            return true;
        if (protoA->shortName().contains("Vlan")
            && protoB->shortName().contains("Vlan"))
            return true;
        return false;
    }

    enum FieldNamePrefix {
        NoPrefix,
        ProtoNamePrefix,
        OuterInnerPrefix
    };

    FieldNamePrefix fieldPrefix{NoPrefix};
};

#endif