/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: VideoDeleteWorker class implementation

* 

*/

// INCLUDE FILES

#include <qtimer.h>

#include "videocollectioncommon.h"

#include "videocollectionclient.h"

#include "videodeleteworker.h"

// ================= MEMBER FUNCTIONS =======================

//

/**

 * private global inline hash function for TMPXItemId keys in QSet

 */

inline uint qHash(TMPXItemId key) 

{ 

    QPair<uint, uint> keyPair(key.iId1, key.iId2); 

    return qHash(keyPair);

}

// -----------------------------------------------------------------------------

// VideoDeleteWorker()

// -----------------------------------------------------------------------------

//

VideoDeleteWorker::VideoDeleteWorker(VideoCollectionClient &collection, QObject *parent) :

QObject(parent),

mCollectionClient(collection),

mRequestWaitTimer(0),

mLastStatus(0),

mLastStatusData(QVariant())

{

}

// -----------------------------------------------------------------------------

// ~VideoDeleteWorker()

// -----------------------------------------------------------------------------

//

VideoDeleteWorker::~VideoDeleteWorker()

{

    if(mRequestWaitTimer && mRequestWaitTimer->isActive())

    {

        mRequestWaitTimer->stop();

    }

    // if we're still doing some background deletion, 

    // dump all deletes to collection and stop timer

    flushAll();

}

// -----------------------------------------------------------------------------

// requestDelete()

// -----------------------------------------------------------------------------

//

void VideoDeleteWorker::requestDelete(const QList<TMPXItemId> &indexList)

{

    if(!mRequestWaitTimer)

    {

        mRequestWaitTimer = new QTimer();

        connect(mRequestWaitTimer, SIGNAL(timeout()), this, SLOT(execDeleteBlockSlot()));

    }

    mRemoveBuffer.unite(QSet<TMPXItemId>::fromList(indexList));

    if(!mRequestWaitTimer->isActive())

    {

        // first startup throught zero timer, after that

        // deletion is chained. Next delete block starts from

        // modelChangedSlot

        mRequestWaitTimer->setSingleShot(true);

        mRequestWaitTimer->start(0);

    }

}

// -----------------------------------------------------------------------------

// removeFromRequest()

// -----------------------------------------------------------------------------

//

int VideoDeleteWorker::removeFromRequest(TMPXItemId &itemId)

{

    mRemoveBuffer.remove(itemId);

    return mRemoveBuffer.count();

}

// -----------------------------------------------------------------------------

// isDeleting()

// -----------------------------------------------------------------------------

//

bool VideoDeleteWorker::isDeleting()

{

    return mRemoveBuffer.count() ? true : false;

}

// -----------------------------------------------------------------------------

// updateStatus()

// -----------------------------------------------------------------------------

//

void VideoDeleteWorker::updateStatus(int status, QVariant data)

{

    // do not update invalid status

    if(status != VideoCollectionCommon::statusDeleteSucceed && 

       status != VideoCollectionCommon::statusSingleDeleteFail &&

       status != VideoCollectionCommon::statusMultipleDeleteFail)

    {

        return;

    }

    if(!mLastStatus || mLastStatus == VideoCollectionCommon::statusDeleteSucceed)

    {

        mLastStatus = status;

        mLastStatusData = data;

        return;    

    }

    if(status == VideoCollectionCommon::statusDeleteSucceed)

    {

        return;

    }

    int count = 0;

    if(mLastStatus == VideoCollectionCommon::statusSingleDeleteFail)

    {

        // old status was single fail

        mLastStatus = VideoCollectionCommon::statusMultipleDeleteFail;

        count = 2;

        if(status == VideoCollectionCommon::statusMultipleDeleteFail)

        {

            count = data.toInt() + 1;

        }

        // count of failed is now 2

        mLastStatusData = count;

        return;

    }

    // all other cases mean multi

    count = data.toInt();

    mLastStatus = VideoCollectionCommon::statusMultipleDeleteFail;

    count ? mLastStatusData = mLastStatusData.toInt() + count : 

                        mLastStatusData = mLastStatusData.toInt() + 1;

}

// -----------------------------------------------------------------------------

// getStatus()

// -----------------------------------------------------------------------------

//

int VideoDeleteWorker::getLastStatus(QVariant &data)

{

    data = mLastStatusData;

    return mLastStatus;

}

// -----------------------------------------------------------------------------

// clearStatus()

// -----------------------------------------------------------------------------

//

void VideoDeleteWorker::clearStatus()

{

    mLastStatus = 0;

    mLastStatusData = QVariant();

}

// -----------------------------------------------------------------------------

// continueSlot()

// -----------------------------------------------------------------------------

//

void VideoDeleteWorker::continueSlot()

{

   if(!mRequestWaitTimer || !mRemoveBuffer.count())

   {

       return;

   }

   if(!mRequestWaitTimer->isActive())

   {

       mRequestWaitTimer->setSingleShot(true);

       mRequestWaitTimer->start(0);

   }

}

// -----------------------------------------------------------------------------

// doBackgroundDeleteSlot()

// -----------------------------------------------------------------------------

//

void VideoDeleteWorker::execDeleteBlockSlot()

{

    if(!mRemoveBuffer.count())

    {

        return;

    }

    QList<TMPXItemId> deleteBlock;

    // create block of max 3 items

    int counter = 0;

    QSet<TMPXItemId>::iterator iter = mRemoveBuffer.begin();

    while(iter != mRemoveBuffer.end() && counter < 3)

    {

        deleteBlock.append((*iter));

        iter = mRemoveBuffer.erase(iter);

        counter++;

    }

    // need to handle errors somehow

    if(mCollectionClient.deleteVideos(&deleteBlock) != 0)

    {

        // signal block delete startup failed

        emit deleteStartupFailed(deleteBlock);

    } 

}

// -----------------------------------------------------------------------------

// flushAll()

// -----------------------------------------------------------------------------

//

void VideoDeleteWorker::flushAll()

{

    if(!mRemoveBuffer.count())

    {

        return;

    }

    QList<TMPXItemId> ids = mRemoveBuffer.toList();

    mCollectionClient.deleteVideos(&ids);

    mRemoveBuffer.clear();

}

// End of file