/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:   CVcxHgMyVideosVideoData class definition*

*/

#ifndef VCXHGMYVIDEOSVIDEODATAUPDATER_H

#define VCXHGMYVIDEOSVIDEODATAUPDATER_H

// INCLUDE FILES

#include <coemain.h>

#include <thumbnailmanager.h>

#include <thumbnailmanagerobserver.h>

#include "vcxhgmyvideosvideodata.h"

// FORWARD DECLARATIONS

class CVcxHgMyVideosModel;

class CHgScroller;

class CMPXMediaArray;

class CThumbnailManager;

class CVcxHgMyVideosVideoList;

class CPeriodic;

// CLASS DECLARATION

/**

 *

 * @lib vcxhgmyvideos.lib

 */

NONSHARABLE_CLASS( CVcxHgMyVideosVideoDataUpdater ) :

        public CActive,

        public MThumbnailManagerObserver 

    {

    public:

        /**

         * Two-phased constructor.

         * 

         * @param aModel Reference to component model.

         * @param aScroller Reference to Hg list control.

         * @param aVideoArray Reference to video array.

         * @return New object.

         */

        static CVcxHgMyVideosVideoDataUpdater* NewL( 

                CVcxHgMyVideosModel& aModel,

                CHgScroller& aScroller,

        /**

         * Two-phased constructor.

         * 

         * @param aModel Reference to component model.

         * @param aScroller Reference to Hg list control.

         * @param aVideoArray Reference to video array.

         * @return New object. 

         */

        static CVcxHgMyVideosVideoDataUpdater* NewLC( 

                CVcxHgMyVideosModel& aModel,

                CHgScroller& aScroller,

        /**

         * Destructor.

         */

        virtual ~CVcxHgMyVideosVideoDataUpdater();

        /**

         * Sets data updater to pause or normal mode.

         * 

         * @param aPaused If ETrue, updater is paused.

         */

        void SetPausedL( TBool aPaused );

        /**

         * Called to inform video data updater that info array has changed.

         * Causes re-setting of all data as info array is the bases for fetched

         * additional video data.  

         */

        void InfoArrayChanged();        

        /**

         * Called by video list implementation when new data is needed.

         * Appends data item into buffer and flushes it to start fetching.

         * 

         * @param aMPXItemId MPX item id of video data.

         */

        void RequestDataL( TMPXItemId aMPXItemId );

        /**

         * Called by video list implementation when new data is needed.

         * Appends data item into buffer that needs to be flushed using 

         * FlushRequestBufferL() to start fetching.

         * 

         * @param aMPXItemId MPX item id of video data.

         */

        void AddToRequestBufferL( TMPXItemId aMPXItemId );

        /**

         * Called by video list implementation when new data is needed.

         * Flushes fetch requests from buffer.

         */

        void FlushRequestBufferL();

        /**

         * Called by video list implementation when data is not needed anymore.

         * Removes data item from buffer.

         * 

         * @param aMPXItemId MPX item id of video data.

         */

        void ReleaseData( TMPXItemId aMPXItemId );

        /**

         * Called when user wants to move or delete video from UI. Removes

         * data item from buffer and cancels ongoing thumbnail generation.

         * 

         * @param aMPXItemId MPX item id of video data.         

         */

        void PrepareForMoveOrDelete( TMPXItemId aMPXItemId );

    public: // From MThumbnailManagerObserver

        /**

         * Preview thumbnail generation or loading is complete.

         *

         * @param aThumbnail An object representing the resulting thumbnail.

         * @param aId Request ID for the operation

         */

        void ThumbnailPreviewReady( MThumbnailData& aThumbnail, TThumbnailRequestId aId );

        /**

         * Final thumbnail bitmap generation or loading is complete.

         *

         * @param aError         Error code.

         * @param aThumbnail     An object representing the resulting thumbnail.

         * @param aId            Request ID for the operation.

         */

        void ThumbnailReady( TInt aError, MThumbnailData& aThumbnail, TThumbnailRequestId aId );

    public: // From CActive

        /**

         * From CActive.

         */

        void RunL();

        /**

         * From CActive. 

         * 

         * @param aError Error code.

         * @return KErrNone if continuing is ok.

         */        

        TInt RunError( TInt aError );

        /**

         * From CActive.

         */        

        void DoCancel();

    protected:    

        /**

         * Default constructor

         *

         * @param aModel Reference to component model.

         * @param aScroller Reference to Hg list control.

         * @param aVideoArray Reference to video array.

         */

        CVcxHgMyVideosVideoDataUpdater( 

                CVcxHgMyVideosModel& aModel,

                CHgScroller& aScroller,

        /**

         * 2nd phase constructor.

         */

        void ConstructL();

		/**

         * Returns index of fetch array based on MPX Item Id.

         * 

         * @param aMpxItemId MPX Item Id.

         * @return Index of array or KErrNotFound.

         */

        TInt IndexByMPXItemId( TMPXItemId aMpxItemId );

        /**

         * Selects next index to be fetched.

         * 

         * @param aSelectForPeekOnly    Select for peek only.

         * @return ETrue if selected otherwise EFalse.

         */

        TBool SelectNextIndexL( TBool aSelectForPeekOnly );

        /**

         * Removes item from fetch array.

         * 

         * @param aIndex Index of fetch array.

         */

        void RemoveItem( TInt aIndex );

        /**

         * Removes item from fetch array and cancel thumbnail generation.

         * 

         * @param aIndex Index of fetch array.         

         */

        void RemoveAndCancelThumbnailGeneration( TInt aIndex );

        /**

         * Cancels possibly ongoing activities (thumbnail generation, DRM check).

         *

         * @param aIndex Index of fetch array.

         */

        void CancelActivities( TInt aIndex );

        /**

         * Adds item into fetch array. 

         * 

         * @param aMPXItemId MPX item id.

         */

        void AddItemToFetchArrayL( TMPXItemId aMPXItemId );

        /**

         * Cancels any on-going video data operations and deletes fetch array.

         */

        void CancelAndDeleteFetchArray();

        /**

         * Makes sure that video data fetching continues.

         */

        void ContinueVideoDataFetchingL();

        /**

         * Updates fetched video data to UI.

         */

        void UpdateVideoDataToUiL( CVcxHgMyVideosVideoData& aVideoData );

        /**

         * Checks if list refreshing is needed.

		 * 

		 * @param aIndex The item index on the Ganes list that was modified last.

         * @return ETrue if refreshing is needed, otherwise EFalse.

		 */

        TBool ListRefreshNeeded( TInt aIndex );

        /**

         * Callback method for RefreshTimer.  

         */

        static TInt RefreshTimerCallBack( TAny* aAny );

        /**

         * Refreshes the ganes list.

         */

        void RefreshScreen();

        /**

         * Checks DRM properties

		 *

		 * @param aVideoData	Reference to video data.

         */

        void CheckDrmL( CVcxHgMyVideosVideoData& aVideoData );

        /**

         * Gets active request count

         *

		 * @param aPeekRequests	On return number of peek requests.

		 * @param aGetRequests	On return number of get requests.

		 */

        void GetActiveRequestCount( TInt& aPeekRequests, TInt& aGetRequests );

        /**

         * Starts thumbnail fetch

         */

        void StartThumbnailL( CVcxHgMyVideosVideoData& aItem, TBool aPeek );

        /**

         * Tries to select item for fetch.

		 * 

		 * @param aIndex				Index

		 * @param aSelectForPeekOnly	ETrue

		 * @return ETrue if selected, otherwise EFalse

         */

        TBool TrySelectL( TInt aIndex, TBool aSelectForPeekOnly );

        /**

         * Tries to select item for fetch.

		 *

		 * @param aPos                Scroller position.

		 * @param aSelectForPeekOnly  Select for peek only status.

		 * @return ETrue if selected, otherwise EFalse.

         */

        TBool TrySelectFromScrollerL( TInt aPos, TBool aSelectForPeekOnly );

        /**

         * Tries to select item for fetch.

		 *

		 * @param aStartPos           Start position.

         * @param aEndPos             End position.

		 * @param aSelectForPeekOnly  Select for peek only status.

		 * @return ETrue if selected, otherwise EFalse.

         */

        TBool TrySelectFromScrollerAreaL( TInt aStartPos, 

                                          TInt aEndPos,

                                          TBool aSelectForPeekOnly );

        /**

         * Starts final actions for finished thumbnails

         */

        void StartFinalActions();

        /**

         * Checks if cancellation of activities is needed for item

		 *

		 * @param aItem		Reference to data item.

		 * @return ETrue if cancel is needed, otherwise EFalse.

         */

        TBool CancelNeeded( CVcxHgMyVideosVideoData& aItem );

        /**

         * Callback method for RetryTimer.  

         */

        static TInt RetryTimerCallBack( TAny* aAny );

        /**

         * Gets scroller area

		 *

		 * @param aFirstIndexOnScreen     First index on screen.

 		 * @param aLastIndexOnScreen      Last index on screen.

		 * @param aLastIndex              Last index.

         */

        void GetScrollerArea( TInt& aFirstIndexOnScreen, 

							  TInt& aLastIndexOnScreen,

        					  TInt& aLastIndex );

    protected:

        /**

         * Reference to component's model.

         * Not own.

         */

        CVcxHgMyVideosModel& iModel;

        /**

         * Hg list component.

         * Not own.

         */

        CHgScroller& iScroller;

        /**

         * Array of videos that need data fetching.

         * Own

         */

        RPointerArray<CVcxHgMyVideosVideoData> iFetchArray; 

        /**

         * Reference to video array.

         * Not own.

         */

        CVcxHgMyVideosVideoList& iVideoArray; 

        /** 

         * Used for indicating that list needs to be refreshed.         

         * Own.

         */ 

        CPeriodic* iRefreshTimer;

        /**

         * Flag for pause state.

         */

        TBool iPaused;

        /**

         * Stores previous first scroller index for checking scroll direction 

         */

        TInt iPreviousFirstScrollerIndex;

        /**

         * Stores time of previous scroller first index update

         */

        TInt64 iPreviousFirstScrollerIndexTime;

        /** 

         * Used for restarting thumbnail creation after scroll

         * Own.

         */

        CPeriodic* iRetryTimer;

        /**

         * For refresh logic

         */

        TBool iPreviousModifiedIndexOnScreen;

    };

#endif // VCXHGMYVIDEOSVIDEODATAUPDATER_H