/*

* 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:   VideoListData class declaration*

*/

#include <mpxmediageneraldefs.h>

#include <mpxmedia.h>

#include <vcxmyvideosdefs.h>

#include "videodatacontainer.h"

#include "videocollectionutils.h"

/**

 * global qHash function required fo creating hash values for TMPXItemId -keys

 */

inline uint qHash(TMPXItemId key) 

{ 

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

    return qHash(keyPair);

}

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

// VideoDataContainer

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

//

VideoDataContainer::VideoDataContainer()

{

    // NOP

}

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

// VideoDataContainer

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

//

VideoDataContainer::~VideoDataContainer()

{

    clear();

    clearRemoved();

}

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

// clear

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

//

void VideoDataContainer::clear()

{

    QHash<TMPXItemId, QPair<int, CMPXMedia*> >::iterator i = mMediaData.begin();

    while(i != mMediaData.end())

    {

        delete (*i).second;

        ++i;

    }

    mMediaData.clear();

    mMediaIds.clear();

}

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

// remove

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

//

void VideoDataContainer::remove(const TMPXItemId &id)

{   

    QHash<TMPXItemId, QPair<int, CMPXMedia*> >::iterator removeIter = mMediaData.find(id);

    if(removeIter == mMediaData.end())

    {

        return;

    }

    QHash<TMPXItemId, QPair<int, CMPXMedia*> >::iterator hashIter;     

    mMediaIds.removeAt(removeIter->first);    

    // sync item indexes whose ids exist in id- list after

    // recently removoved. 

    decIndexesAfter(removeIter->first);

    delete removeIter->second;

    mMediaData.erase(removeIter);

}   

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

// append

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

//

void VideoDataContainer::append(CMPXMedia *media)

{

    TMPXItemId mediaId = TMPXItemId::InvalidId();

    VideoCollectionUtils::instance().mediaValue<TMPXItemId>(media, KMPXMediaGeneralId, mediaId );

    if(mediaId == TMPXItemId::InvalidId())

    {

        // could not get id or id does not match ==> NOP

        return;       

    }

    QHash<TMPXItemId, QPair<int, CMPXMedia*> >::iterator iter = mMediaData.find(mediaId);

    // if item is in the removal list, not allowed to append

    if(mRemovedMedia.contains(mediaId))

    {

        delete media;

        return;    

    }

    // if item exist, do not add into container

    if(iter != mMediaData.end())

    {

        return;

    }      

    mMediaIds.append(mediaId);

    mMediaData[mediaId] = qMakePair( mMediaIds.count() - 1, media);     

}

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

// fromIndex

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

//

CMPXMedia* VideoDataContainer::fromIndex(int index) const

{   

    if(index >= 0 && index < mMediaIds.count() && mMediaData.contains(mMediaIds[index]))

    {   

        return (mMediaData.find(mMediaIds[index]))->second;

    }

    return 0;  

}

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

// indexOfId

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

//

int VideoDataContainer::indexOfId(const TMPXItemId &id) const

{

    QHash<TMPXItemId, QPair<int, CMPXMedia*> >::const_iterator iter = mMediaData.find(id);

    if( iter != mMediaData.constEnd())

    {

        return iter->first;

    }

    return -1;

}

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

// idFromIndex

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

//

TMPXItemId VideoDataContainer::idFromIndex(int index) const

{

    if(index >= 0 && index < mMediaIds.count())

    {

        return mMediaIds[index];

    }

    return TMPXItemId::InvalidId();    

}

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

// count

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

//

int VideoDataContainer::count() const

{

    return mMediaData.count();

}

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

// decIndexesAfter

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

//

void VideoDataContainer::decIndexesAfter(int fromIndex)

{

    int count = mMediaIds.count();

    QMultiHash<TMPXItemId, QPair<int, CMPXMedia*> >::iterator hashIter;   

    for(int i = fromIndex; i < count; ++i)

    {

        hashIter = mMediaData.find(mMediaIds[i]);

        if(hashIter != mMediaData.end())

        {

            hashIter->first--;

        }

    }   

}

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

// markItemsRemoved

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

//

TMPXItemId VideoDataContainer::markItemRemoved(const int &itemIndex)

{

    // for all provided indexes:

    // - get item address from mMediaData

    // - get item index from mMediaData

    // - remove item from mMediaData, do not deallocate object

    // - remove item's id from mMediaIds -list 

    // - append item into mRemovedMedia

    // - append item's id into returned id -list

    TMPXItemId id = TMPXItemId::InvalidId();

    CMPXMedia *media = 0;

    id = idFromIndex(itemIndex);

    media = fromIndex(itemIndex);    

    if(id == TMPXItemId::InvalidId() || !media)

    {

        return id;

    }

    if(!mRemovedMedia.contains(id))

    {

        mRemovedMedia[id] = media;  

    }

    mMediaData.remove(id);

    mMediaIds.removeAt(itemIndex);

    decIndexesAfter(itemIndex);

    return id;

}

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

// clearRemoved

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

//

int VideoDataContainer::clearRemoved(QList<TMPXItemId> *itemIds)

{

    int count = 0;

    QList<TMPXItemId> ids;

    QList<TMPXItemId>::const_iterator iterEnd;

    if(!itemIds)

    {

        ids = mRemovedMedia.keys();

    }

    else

    {

        ids = *itemIds;

    }

    QList<TMPXItemId>::const_iterator idIter = ids.constBegin();

    QHash<TMPXItemId, CMPXMedia*>::iterator iter;

    while(idIter != ids.constEnd())

    {

        iter = mRemovedMedia.find((*idIter));

        if(iter != mRemovedMedia.end())

        {

            delete (*iter);

            mRemovedMedia.remove((*idIter));

            count++;

        }        

        ++idIter;

    }

    return count;

}

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

// restoreRemovedItems

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

//

int VideoDataContainer::restoreRemovedItems(QList<TMPXItemId> *itemIds)

{  

    int count = 0;

    QList<TMPXItemId> ids;

    QList<TMPXItemId>::const_iterator iterEnd;

    if(!itemIds)

    {

        ids = mRemovedMedia.keys();

    }

    else

    {

        ids = *itemIds;

    }

    QList<TMPXItemId>::const_iterator idIter = ids.constBegin();

    QHash<TMPXItemId, CMPXMedia*>::iterator iter;

    while(idIter != ids.constEnd())

    {

        iter = mRemovedMedia.find((*idIter));        

        if(iter != mRemovedMedia.constEnd() && !mMediaData.contains(iter.key()))

        {

            // append data to actual containers and remove item from deleted hash

            mMediaIds.append(iter.key());

            mMediaData[iter.key()] = qMakePair(mMediaIds.count() - 1, iter.value());              

            mRemovedMedia.remove((*idIter));

            count++;    

        }

        ++idIter;

    }    

    return count;

}

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

// getRemovedMedia

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

//

CMPXMedia* VideoDataContainer::getRemovedMedia(TMPXItemId itemId)

{

    QHash<TMPXItemId, CMPXMedia*>::const_iterator itemIter = 

                                            mRemovedMedia.constFind(itemId);

    if(itemIter != mRemovedMedia.constEnd())

    {

        return itemIter.value();

    }

   return 0;

}

// end of file