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#include <qxtdatastreamsignalserializer.h>
#include <QIODevice>
#include <QDataStream>
#include <QtGlobal>
#include <QtDebug>
#include <qendian.h>

QByteArray QxtDataStreamSignalSerializer::serialize(const QString& fn, const QVariant& p1, const QVariant& p2, const QVariant& p3,
        const QVariant& p4, const QVariant& p5, const QVariant& p6, const QVariant& p7, const QVariant& p8) const
{
    QByteArray rv;
    QDataStream str(&rv, QIODevice::WriteOnly);
    str << fn;
    unsigned char ct = 8;
    if (!p1.isValid()) ct = 0;
    else if (!p2.isValid()) ct = 1;
    else if (!p3.isValid()) ct = 2;
    else if (!p4.isValid()) ct = 3;
    else if (!p5.isValid()) ct = 4;
    else if (!p6.isValid()) ct = 5;
    else if (!p7.isValid()) ct = 6;
    else if (!p8.isValid()) ct = 7;
    str << ct;
    if (ct-- > 0) str << p1;
    if (ct-- > 0) str << p2;
    if (ct-- > 0) str << p3;
    if (ct-- > 0) str << p4;
    if (ct-- > 0) str << p5;
    if (ct-- > 0) str << p6;
    if (ct-- > 0) str << p7;
    if (ct-- > 0) str << p8;
    char sizeData[4];
    qToLittleEndian(quint32(rv.size()), (uchar*)sizeData);
    return QByteArray(sizeData, 4) + rv;
}

QxtAbstractSignalSerializer::DeserializedData QxtDataStreamSignalSerializer::deserialize(QByteArray& data)
{
    QByteArray cmd;
    quint32 len = qFromLittleEndian<quint32>(reinterpret_cast<const uchar*>(data.constData()));

    cmd = data.mid(4, len);
    data = data.mid(len + 4);
    if (cmd.length() == 0) return NoOp();

    QDataStream str(cmd);

    QString signal;
    unsigned char argCount;
    QList<QVariant> v;
    QVariant t;
    str >> signal >> argCount;

    if (str.status() == QDataStream::ReadCorruptData) return ProtocolError();

    for (int i = 0; i < argCount; i++)
    {
        str >> t;
        v << t;
    }
    return qMakePair(signal, v);
}

bool QxtDataStreamSignalSerializer::canDeserialize(const QByteArray& buffer) const
{
    if(buffer.length() < int(sizeof(quint32))) return false;
    quint32 headerLen = qFromLittleEndian<quint32>(reinterpret_cast<const uchar*>(buffer.constData()));
    quint32 bodyLen = quint32(buffer.length() - 4);
    return headerLen <= bodyLen;
}
