#include "gats-qt/gatsstream.h"
#include "gats-qt/object.h"

#ifdef WIN32
#include <winsock2.h>
#else
#include <arpa/inet.h>
#endif

#include <QBuffer>

Gats::GatsStream::GatsStream( QIODevice &rStream ) :
	rStream( rStream )
{
}

Gats::GatsStream::~GatsStream()
{
}

Gats::Object *Gats::GatsStream::readObject()
{
	char buf[1500];

	do
	{
		if( qbRead.size() < 5 )
		{
			int iRead = rStream.read( buf, 5-qbRead.size() );
			qbRead.append( buf, iRead );

			if( qbRead.size() < 5 )
				return NULL;
		}
	} while( !skipReadNulls() );

	uint8_t uVer;
	uVer = qbRead[0];
	
	int32_t iSize;
	memcpy( &iSize, qbRead.constData()+1, 4 );
	iSize = ntohl( iSize );
	while( qbRead.size() < iSize )
	{
		int32_t iRead = iSize - qbRead.size();
		if( iRead > 1500 )
			iRead = 1500;
		int32_t iReal = rStream.read( buf, iRead );
		qbRead.append( buf, iReal );
		if( iReal < iRead )
		{
			return NULL;
		}
	}

	if( qbRead.size() < iSize )
	{
		return NULL;
	}

	QBuffer rTmp( &qbRead );
	rTmp.open( QIODevice::ReadOnly );
	rTmp.seek( 5 );
	Gats::Object *pObj = Gats::Object::read( rTmp );
	qbRead.clear();

	emit objectRead( pObj );

	return pObj;
}

void Gats::GatsStream::writeObject( Gats::Object *pObject )
{
	QIODevice *pTmp;
	if( rStream.isSequential() )
	{
		pTmp = new QBuffer();
		pTmp->open( QIODevice::WriteOnly );
	}
	else
	{
		pTmp = &rStream;
	}

	uint8_t uBuf = 1;
	uint32_t iSize = 0;
	pTmp->write( (const char *)&uBuf, 1 );
	uint64_t iSizePos = pTmp->pos();
	pTmp->write( (const char *)&iSize, 4 );
	pObject->write( *pTmp );
	iSize = htonl( pTmp->pos() );
	uint64_t iEndPos = pTmp->pos();
	pTmp->seek( iSizePos );
	pTmp->write( (const char *)&iSize, 4 );

	if( rStream.isSequential() )
	{
		pTmp->close();
		rStream.write( ((QBuffer *)pTmp)->data() );
		delete pTmp;
	}
	else
	{
		pTmp->seek( iSizePos );
	}
}

bool Gats::GatsStream::skipReadNulls()
{
	bool bHaveSeeked = false;
	for(;;)
	{
		if( qbRead.size() == 0 )
			return false;
		if( qbRead.at(0) != 0 )
			return !bHaveSeeked; //true;
		else
		{
			qbRead.remove( 0, 1 );
			bHaveSeeked = true;
		}
	}
}