/*

* 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: VideoThumbnailFetcher class implementation

*

*/

// INCLUDE FILES

#include <qpixmap.h>

#include <thumbnailmanager_qt.h>

#include "videothumbnailfetcher.h"

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

//

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

// VideoThumbnailFetcher::VideoThumbnailFetcher()

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

//

{

    mThumbnailManager = new ThumbnailManager();

    mThumbnailManager->setThumbnailSize(ThumbnailManager::ThumbnailMedium);

    mThumbnailManager->setQualityPreference(ThumbnailManager::OptimizeForPerformance);

    mThumbnailManager->setMode(ThumbnailManager::CropToAspectRatio);

    connect(mThumbnailManager, SIGNAL(thumbnailReady( QPixmap , void * , int , int )),

                this, SLOT(thumbnailReadySlot( QPixmap , void * , int , int )));

}

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

// VideoThumbnailFetcher::~VideoThumbnailFetcher()

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

//

VideoThumbnailFetcher::~VideoThumbnailFetcher()

{

    cancelFetches();

    disconnect(mThumbnailManager, SIGNAL(thumbnailReady( QPixmap , void * , int , int )),

                this, SLOT(thumbnailReadySlot( QPixmap , void * , int , int )));

    delete mThumbnailManager;

    mThumbnailManager = 0;

}

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

// VideoThumbnailFetcher::addFetch()

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

//

void VideoThumbnailFetcher::addFetch(const QString fileName, void *internal, int priority)

{

    ThumbnailFetchData *fetch = new ThumbnailFetchData;

    fetch->mFileName = fileName;

    fetch->mInternal = internal;

    fetch->mPriority = priority;

    mFetchList.append(fetch);

}

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

// VideoThumbnailFetcher::continueFetching()

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

//

void VideoThumbnailFetcher::continueFetching()

{

    mPaused = false;

    // First fetch all thumbnails that have been created already, next

    // start thumbnail creation for one thumbnail at a time. 

    if(!mFetchList.isEmpty())

    {

        startThumbnailFetches();

    }

    else if(!mCreationList.isEmpty())

    {

        startThumbnailCreation();

    }

    // All thumbnails have been fetched, report it.

    if(mFetchList.isEmpty() && mCreationList.isEmpty() && mStartedFetchList.isEmpty())

    {

        emit allThumbnailsFetched();

    }

}

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

// VideoThumbnailFetcher::startThumbnailFetches()

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

//

void VideoThumbnailFetcher::startThumbnailFetches()

{

    if(!mThumbnailManager)

        return;

    // Only fetch those thumbnails that are already been created.

    mThumbnailManager->setMode(ThumbnailManager::DoNotCreate);

    // Push all from thumbnail manager.

    while(!mFetchList.isEmpty())

    {

        ThumbnailFetchData *fetch = mFetchList.takeFirst();

        int requestId = mThumbnailManager->getThumbnail(fetch->mFileName,

               fetch->mInternal, fetch->mPriority);

        if(requestId != -1)

        {

            // Request succeed, add to list of started fetches.

            mStartedFetchList.insert(requestId, fetch);

        }

        else

        {

            // Request failed, free internal data.

            delete fetch->mInternal;

            delete fetch;

        }

    }

}

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

// VideoThumbnailFetcher::startThumbnailCreation()

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

//

void VideoThumbnailFetcher::startThumbnailCreation()

{

    if(!mThumbnailManager || !mTbnCreationEnabled)

        return;

    mThumbnailManager->setMode(ThumbnailManager::CropToAspectRatio);

    // Do nothing if list is empty. 

    if(mCreationList.isEmpty())

        return;

    // Find fetch with highest priority. 

    int highestPriority = 0;

    int indexWithHighestPriority = 0;

    for(int i = 0; i < mCreationList.count(); i++)

    {

        if(mCreationList.at(i)->mPriority > highestPriority)

        {

            indexWithHighestPriority = i;

            highestPriority = mCreationList.at(i)->mPriority;

        }

    }

    ThumbnailFetchData *fetch = mCreationList.takeAt(indexWithHighestPriority);

    // Do request to thumbnail manager.

    int requestId = mThumbnailManager->getThumbnail(fetch->mFileName,

            fetch->mInternal, fetch->mPriority);

    // Request failed, free internal data.

    if(requestId == -1)

    {

        delete fetch->mInternal;

        delete fetch;

    }

    else 

    {

        // Don't keep track of fetches when creating thumbnails, if

        // it fails with -1 it would be only tried to create again.  

        delete fetch;

    }

}

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

// VideoThumbnailFetcher::pauseFetching()

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

//

void VideoThumbnailFetcher::pauseFetching()

{

    mPaused = true;

}

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

// VideoThumbnailFetcher::cancelFetches()

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

//

void VideoThumbnailFetcher::cancelFetches()

{

    // Clear list of started fetches, thumbnail manager has the internal 

    // pointer.

    QList<int> keys = mStartedFetchList.keys();

    for(int i = 0; i < keys.count(); i++ )

    {

        delete mStartedFetchList.take(keys[i]);

    }

    // Merge lists and free data.

    mFetchList.append(mCreationList);

    mCreationList.clear();

    while(!mFetchList.isEmpty())

    {

        ThumbnailFetchData *fetch = mFetchList.takeFirst();

        delete fetch->mInternal;

        delete fetch;

    }

}

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

// VideoThumbnailFetcher::fetchCount()

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

//

int VideoThumbnailFetcher::fetchCount()

{

    return mFetchList.count() + mCreationList.count() + mStartedFetchList.count();

}

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

// VideoThumbnailFetcher::enableThumbnailCreation()

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

//

void VideoThumbnailFetcher::enableThumbnailCreation(bool enable)

{

    mTbnCreationEnabled = enable;

}

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

// VideoThumbnailFetcher::thumbnailReadySlot()

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

//

void VideoThumbnailFetcher::thumbnailReadySlot(QPixmap tnData, void *internal, int requestId, int error)

{

    // Thumbnail has not been generated yet, put it into creation list.

    if(error == -1 && internal)

    {

        if(mStartedFetchList.contains(requestId))

        {

            ThumbnailFetchData *fetch = mStartedFetchList.take(requestId);

            mCreationList.append(fetch);

        }

        else

        {

            // Fetch data was not found, meaning cancelFetches was called.

            delete internal;

        }

    }

    else

    {

        // Report that thumbnail was fetched.

        emit thumbnailReady(tnData, internal, error);

        if(mStartedFetchList.contains(requestId))

            delete mStartedFetchList.take(requestId);

    }

    // Continue the fetching process.

    if(!mPaused && mStartedFetchList.isEmpty())

        continueFetching();

}

// End of file.