/*

* Copyright (c) 2006 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:  Thumbnail loader implementation

*

*/

#include <thumbnaildata.h>

#include <AknIconUtils.h>

#include "mpxcollectionviewhgtnloader.h"

#include "mpxlog.h"

_LIT( KMPXAlbumMimeType, "audio/mpeg3" );

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

// CODEScrollerTNLoader::NewL()

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

//

CMpxTNLoader* CMpxTNLoader::NewL (

        MMpxTNLoaderObserver& aObserver, TThumbnailSize aSize )

    {

    CMpxTNLoader* self = new (ELeave) CMpxTNLoader(aObserver, aSize );

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop(self);

    return self;

    }

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

// CMpxTNLoader:~CMpxTNLoader()

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

//

CMpxTNLoader::~CMpxTNLoader ( )

    {

    // cancel outstanding requests

    if(iTnEngine)

        {

//        CancelAll();

        }

    iLoading.ResetAndDestroy();

    delete iTnEngine;

    if( iAsyncCallBack )

        iAsyncCallBack->Cancel();

    delete iAsyncCallBack;

    if( iPauseTimer )

        iPauseTimer->Cancel();

    delete iPauseTimer;

    }

TInt CMpxTNLoader::LoadThumbnail( TAny* aSelf )

    {

    CMpxTNLoader* self = (CMpxTNLoader*)aSelf;

    MPX_TRAPD( err, self->LoadNextTNL() );

    return err;

    }

void CMpxTNLoader::LoadNextTNL()

    {

    if( iPaused )

        return;

    if( iLoading.Count() > 0 )

        {

        TInt index = iLoading[0]->iIndex;

        if( index >= 0 && iLoading[0]->iId == 0)

            {

            CThumbnailObjectSource* source = CThumbnailObjectSource::NewLC(iLoading[0]->iFileName, KMPXAlbumMimeType);

            TRAPD(err, iLoading[0]->iId = iTnEngine->GetThumbnailL( *source, NULL, 1 ); )

        	MPX_DEBUG4( "GetThumbnailL: %d [%d,%d]", err, index, iLoading[0]->iId);

			CleanupStack::PopAndDestroy(source);

            }

        }

    }

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

// CMpxTNLoader::ThumbnailPreviewReady()

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

//

void CMpxTNLoader::ThumbnailPreviewReady (MThumbnailData& /*aThumbnail*/,

        TThumbnailRequestId /*aId*/ )

    {

    // Previews not currently used

    }

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

// CMpxTNLoader::ThumbnailReady()

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

//

void CMpxTNLoader::ThumbnailReady (TInt aError,

        MThumbnailData& aThumbnail, TThumbnailRequestId aId )

    {

    TInt index = FindLoadingById(aId, ETrue);

	MPX_DEBUG4( "ThumbnailReady: %d [%d,%d]", aError, index, aId );

    if( index != KErrNotFound )

        {

        CFbsBitmap* bitmap = (aError == KErrNone ? aThumbnail.DetachBitmap() : NULL);

        TRAP_IGNORE(iObserver.TNReadyL(aError, bitmap, NULL, index));

        if( iLoading.Count() > 0 )

            {

            if(!iAsyncCallBack->IsActive())

                iAsyncCallBack->CallBack();

            }

        }

    }

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

// CMpxTNLoader::CMpxTNLoader()

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

//

CMpxTNLoader::CMpxTNLoader (MMpxTNLoaderObserver& aObserver, TThumbnailSize aSize )

: iObserver( aObserver ), iSize(aSize)

    {

    }

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

// CMpxTNLoader::ConstructL()

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

//

void CMpxTNLoader::ConstructL ()

    {

    iTnEngine = CThumbnailManager::NewL( *this );

    iTnEngine->SetFlagsL( CThumbnailManager::EDefaultFlags );

    iTnEngine->SetQualityPreferenceL( CThumbnailManager::EOptimizeForQuality );

    iTnEngine->SetThumbnailSizeL( iSize );

    TCallBack callback(CMpxTNLoader::LoadThumbnail, this);

    iAsyncCallBack = new (ELeave) CAsyncCallBack( CActive::EPriorityHigh );

    iAsyncCallBack->Set(callback);

    iPauseTimer = CPeriodic::NewL( CActive::EPriorityStandard  );

    }

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

// CMpxTNLoader::FindLoading()

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

//

TInt CMpxTNLoader::FindLoadingById(TThumbnailRequestId aId, TBool aRemove)

    {

    TInt index = KErrNotFound;

    for(TInt i = 0; i < iLoading.Count(); ++i)

        {

        if(iLoading[i]->iId == aId)

            {

            index = iLoading[i]->iIndex;

            if(aRemove)

                {

                delete iLoading[i];

                iLoading.Remove(i);

                }

            break;

            }

        }

    return index;

    }

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

// CMpxTNLoader::FindLoading()

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

//

TInt CMpxTNLoader::FindLoadingByIndex(TInt aIndex, TBool aRemove)

    {

    TInt index = KErrNotFound;

    for(TInt i = 0; i < iLoading.Count(); ++i)

        {

        if(iLoading[i]->iIndex == aIndex)

            {

            index = i;

            if(aRemove)

                {

                delete iLoading[i];

                iLoading.Remove(i);

                }

            break;

            }

        }

    return index;

    }

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

// CMpxTNLoader::LoadThumbL()

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

//

void CMpxTNLoader::LoadThumbL( TInt aIndex, const TDesC& aFileName )

    {

    if( FindLoadingByIndex(aIndex) == KErrNotFound )

        {

        iLoading.Append( new (ELeave) TLoadingTN( 0, aIndex, aFileName ) );

        if( !iAsyncCallBack->IsActive() )

            iAsyncCallBack->CallBack();

        }

    }

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

// CMpxTNLoader::CancelThumb()

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

//

void CMpxTNLoader::CancelThumb( TInt aIndex )

    {

    TInt loadingIndex = FindLoadingByIndex( aIndex );

    if(loadingIndex != KErrNotFound)

        {

        if( iLoading[loadingIndex]->iId != 0 )

            {

			MPX_DEBUG2( "Cancel Thumb Request: %d", aIndex );

            iTnEngine->CancelRequest( iLoading[loadingIndex]->iId );

            }

        delete iLoading[loadingIndex];

        iLoading.Remove(loadingIndex);

        }

    }

void CMpxTNLoader::CancelAll()

    {

    while ( iLoading.Count() > 0 )

        {

        if( iLoading[0]->iId != 0 )

            iTnEngine->CancelRequest( iLoading[0]->iId );

        delete iLoading[0];

        iLoading.Remove(0);

        }

    }

void CMpxTNLoader::SetSizeL( TThumbnailSize aSize )

    {

    iTnEngine->SetThumbnailSizeL( aSize );

    }

void CMpxTNLoader::Pause(TTimeIntervalMicroSeconds32 aDelay)

    {

    iAsyncCallBack->Cancel();

    iPaused = ETrue;

    iPauseTimer->Cancel();

    iPauseTimer->Start(

            aDelay, aDelay, 

            TCallBack(ResumeCallback, this));

    }

void CMpxTNLoader::Resume()

    {

    iPaused = EFalse;

    if( !iAsyncCallBack->IsActive() )

        iAsyncCallBack->CallBack();    

    iPauseTimer->Cancel();

    }

TInt CMpxTNLoader::ResumeCallback(TAny* aPtr)

    {

    CMpxTNLoader* self = (CMpxTNLoader*)aPtr;

    if( self )

        {

        self->Resume();

        }

    return KErrNone;

    }