/*
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 _GMP_H
#define _GMP_H

#include "abstractprotocol.h"
#include "gmp.pb.h"

#include <QHash>

/* 
Gmp Protocol Frame Format - TODO: for now see the respective RFCs
*/

class GmpProtocol : public AbstractProtocol
{
public:
    enum GmpField
    {
      // ------------
      // Frame Fields
      // ------------
        // Fields used in all ASM and SSM messages, unless otherwise specified
        kType = 0,
        kRsvdMrtCode,
        kChecksum,
        kMldMrt,    // MLD Only (except MLDv2 Report)
        kMldRsvd,   // MLD Only (except MLDv2 Report)
       
        // Field used in ASM messages
        kGroupAddress,
        FIELD_COUNT_ASM_ALL,

        // Fields used in SSM Query
        kRsvd1 = FIELD_COUNT_ASM_ALL,
        kSFlag,
        kQrv,
        kQqic,
        kSourceCount,
        kSources,
        FIELD_COUNT_SSM_QUERY,

        // Fields used in SSM Report
        kRsvd2 = FIELD_COUNT_SSM_QUERY,
        kGroupRecordCount,
        kGroupRecords,
        FIELD_COUNT_SSM_REPORT,
        FRAME_FIELD_COUNT = FIELD_COUNT_SSM_REPORT,

      // -----------
      // Meta Fields
      // -----------
        kIsOverrideChecksum = FRAME_FIELD_COUNT,

        kGroupMode,
        kGroupCount,
        kGroupPrefix,

        kIsOverrideSourceCount,

        kIsOverrideGroupRecordCount,

        FIELD_COUNT
    };

    GmpProtocol(StreamBase *stream, AbstractProtocol *parent = 0);
    virtual ~GmpProtocol();

    virtual ProtocolIdType protocolIdType() const;

    virtual int fieldCount() const;
    virtual int frameFieldCount() const;

    virtual AbstractProtocol::FieldFlags fieldFlags(int index) const;
    virtual QVariant fieldData(int index, FieldAttrib attrib,
               int streamIndex = 0) const;
    virtual bool setFieldData(int index, const QVariant &value, 
            FieldAttrib attrib = FieldValue);

    virtual int protocolFrameSize(int streamIndex = 0) const;

    virtual int protocolFrameVariableCount() const;

protected:
    OstProto::Gmp    data;

    int msgType() const;

    virtual bool isSsmReport() const = 0;
    virtual bool isQuery() const = 0;
    virtual bool isSsmQuery() const = 0;

    int qqic(int value) const;

    virtual quint16 checksum(int streamIndex) const = 0;

private:
    static QHash<int, int> frameFieldCountMap;
};

inline int GmpProtocol::msgType() const 
{ 
    return fieldData(kType, FieldValue).toInt(); 
}

inline int GmpProtocol::qqic(int value) const
{
    return quint8(value); // TODO: if value > 128 convert to mantissa/exp form
}

#endif