/*

* Copyright (c) 2007 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:   Provides albums support from MDS*

*/

#ifndef VCXMYVIDEOSMDSALBUMS_H

#define VCXMYVIDEOSMDSALBUMS_H

// INCLUDES

#include <mdequery.h>

#include <mpxmedia.h>

#include "vcxmyvideosalbum.h"

#include "vcxmyvideosmdsdb.h"

// FORWARD DECLARATIONS

class CMPXMedia;

// CONSTANTS

// CLASS DECLARATION

/**

* Provides albums support, uses MDS.

*

* @lib mpxmyvideoscollectionplugin.lib

*/

NONSHARABLE_CLASS(CVcxMyVideosMdsAlbums) :

        public CActive,

        public MMdEQueryObserver,

        public MMdERelationItemObserver

#if 0

        ,

        public MMdERelationObserver

#endif

    {    

    public: // Constructors and destructor

        friend class CVcxMyVideosMdsCmdQueue;

        friend class CVcxMyVideosMdsDb;

        enum TVcxAsyncOperation

            {

            EVcxNone,

            EVcxAddVideosToAlbum,

            EVcxRemoveRelations,

            EVcxRemoveAlbums

            };

        /**

        * Constructor.

        * 

        * @param aMdsDb    Owner of this object.

        * @param aObserver Object which is listening album related events. If NULL, then

        *                  no observer is set.

        */

        static CVcxMyVideosMdsAlbums* NewL( CVcxMyVideosMdsDb& aMdsDb,

                MVcxMyVideosMdsAlbumsObserver* aObserver );

        /**

        * Destructor

        */

        virtual ~CVcxMyVideosMdsAlbums();

    public: // new methods

        /**

         * From CActive.

         * Cancels possible ongoing asynchronous request.

         * 

         * @param aType Defines what kind of request is cancelled.

         */

        void DoCancel( CVcxMyVideosMdsDb::TRequestType aType = CVcxMyVideosMdsDb::EAll );

        /**

         * Cancels queries.

         *

         * @param aType Defines what kind of request is cancelled.

         */

        void CancelQueries( CVcxMyVideosMdsDb::TRequestType aType = CVcxMyVideosMdsDb::EAll );

        /**

        * Gets My Videos albums from MDS asynchronously.

        * HandleGetAlbumsResp() callback function is called when ready.

        * Utilizes CVcxMyVideosMdsCmdQueue.

        *

        * @param aAlbumList  Album list is written here. Caller owns this, ownership

        *                    does not move.

        * @param aClient     Response call is done to this object.

        */

        void GetAlbumsL( CMPXMedia* aAlbumList, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Gets album from MDS synchronously.

         * 

         * @param aId  MDS ID of the album to be fetched.

         * @returm     MPX media containing album data. Ownership

         *             moves to caller. NULL if not found.

         */

        CMPXMedia* GetAlbumL( TUint32 aId );

        /**

         * Gets album content IDs asynchronously.

         * HandleGetAlbumContentIdsResp() callback function is called when ready.

         * Utilizes CVcxMyVideosMdsCmdQueue.

         *

         * @param aAlbumId      Album ID.

         * @param aContentArray Item IDs which belog to aAlbum are written here. Caller must

         *                      keep aContentArray available until HandleGetAlbumContentIdsResp

         *                      has been called.

        * @param aClient        Response call is done to this object.

         */

        void GetAlbumContentIdsL( TUint32 aAlbumId, RArray<TVcxMyVideosAlbumVideo>& aContentArray,

                MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Gets album content videos asynchronously.

         * HandleGetAlbumContentVideosResp() callback function is called when ready.

         * Utilizes CVcxMyVideosMdsCmdQueue.

         * 

         * @param aAlbumId    Album ID.

         * @param aVideoList  Media containing media array. Video media objects are added to media array.

         *                    Caller must keep aVideoList available until callback has been called.

         * @param aClient     Response call is done to this object.

         */

        void GetAlbumContentVideosL( TUint32 aAlbumId, CMPXMedia& aVideoList,

                MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Adds videos to album asynchronously. HandleAddVideosToAlbumResp() callback function

         * is called when operation finishes.

         * Utilizes CVcxMyVideosMdsCmdQueue.

         *

         * @param aMpxCmd    Media containing command parameters: album ID and video ID list.

         *                   Results are also written to this object. See media structure and

         *                   used attributes from vcxmyvideosdef.c file,

         *                   KVcxCommandMyVideosAddToAlbum command. Ownership does not move.

         *                   

         * @param aClient    Response call is done to this object.

         */

        void AddVideosToAlbumL( CMPXMedia* aMpxCmd, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Removes relations asynchronously.

         * Utilizes CVcxMyVideosMdsCmdQueue.

         * 

         * @param aRelationIds  Relations which are removed.

         * @param aResults      In sync with aRelationIds. Result codes, KErrNone if successful,

         *                      KErrGeneral if failed.

         * @param aClient       Response call is done to this object.

         */

        void RemoveRelationsL( RArray<TUint32>& aRelationIds,

                RArray<TUint32>& aResults, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Adds album to MDS. aAlbum should have KMPXMediaGeneralTitle attribute

         * set. The MDS item ID of the created album is written to KMPXMediaGeneralId

         * attribute.

         * 

         * @param aAlbum  Album which is added to database. 

         */

        void AddAlbumL( CMPXMedia& aAlbum );

        /**

         * Removes albums asynchronously. HandleRemoveAlbumsResp() callback function

         * is called when operation finishes.

         * Utilizes CVcxMyVideosMdsCmdQueue.

         *

         * @param aMpxCmd    Media containing command parameters: media array containing album IDs.

         *                   Results are also written to this object. See media structure and

         *                   used attributes from vcxmyvideosdef.c file,

         *                   KVcxCommandMyVideosRemoveAlbums command. Ownership does not move.

         *                   

         * @param aClient    Response call is done to this object.

         */        

        void RemoveAlbumsL( CMPXMedia* aMpxCmd, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Sets album attributes.

         * 

         * @param aVideo  Values from aVideo are written to MDS.

         */

        void SetAlbumL( CMPXMedia& aVideo );

    protected:

        /**

        * From CActive.

        * Called when operation completes.

        */

        void RunL();

        /**

        * From CActive.

        * Actual implementation for cancelling.

        */

        void DoCancel();

    private:

        /**

        * Constructor

        */

        CVcxMyVideosMdsAlbums( CVcxMyVideosMdsDb& aMdsDb,

                MVcxMyVideosMdsAlbumsObserver* aObserver );

        /**

        * Symbian 2nd phase constructor.

        */

        void ConstructL();

        /**

        * Copies album data from aObject to aAlbum.

        *

        * @param aObject  MDS object to copy data from.

        * @param aAlbum   MPX media to copy data to.

        */

        void Object2MediaL( CMdEObject& aObject, CMPXMedia& aAlbum );

        /**

         * Copies album data from aAlbum to aObject.

         * 

         * @param aAlbum MPX media to copy data from.

         * @param aObject MDS object to copy data to.

         */

        void Media2ObjectL( CMPXMedia& aAlbum, CMdEObject& aObject);

        /**

        * Gets various defintions from MDS and stores them to member variables.

        */

        void GetSchemaDefinitionsL();

        /**

        * Gets My Videos albums from MDS asynchronously.

        * HandleGetAlbumsResp() callback function is called when ready.

        *

        * @param aAlbumList  Album list is written here. Caller owns this, ownership

        *                    does not move.

        * @param aClient     Callback is done to this object.

        */

        void DoGetAlbumsL( CMPXMedia* aAlbumList, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Gets album content IDs from MDS asynchronously.

         * HandleGetAlbumContentIdsResp() callback function is called when ready.

         *

         * @param aAlbumId      Album ID.

         * @param aContentArray Array containing MDS IDs which belong to aAlbum.

         *                      Caller is responsible to keep array available

         *                      until HandleGetAlbumContentResp has been called. 

        * @param aClient        Callback is done to this object.

         */

        void DoGetAlbumContentIdsL( TUint32 aAlbumId,

                RArray<TVcxMyVideosAlbumVideo>& aContentArray,

                MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Gets album content videos from MDS asynchronously.

         * HandleGetAlbumContentVideosResp() callback function is called when ready.

         * 

         * @param aAlbumId   Album ID.

         * @param aVideoList Media containing empty media array. Videos are added to array. Caller

         *                   must keep aVideoList available until HandleGetAlbumContentVideosResp

         *                   is called.

         * @param aClient    Callback is done to this object.

         */

        void DoGetAlbumContentVideosL( TUint32 aAlbumId, CMPXMedia& aVideoList,

                MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Adds videos to album asynchronously. HandleAddVideosToAlbumResp() callback function

         * is called when operation finishes.

         * 

         * @param aMpxCmd    Media containing command parameters: album ID and video ID list.

         *                   Results are also written to this object. See media structure and

         *                   used attributes from vcxmyvideosdef.c file,

         *                   KVcxCommandMyVideosAddToAlbum command. Ownership does not move.

         * @param aClient    Response call is done to this object.

         */

        void DoAddVideosToAlbumL( CMPXMedia* aMpxCmd, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Removes relations asynchronously.

         * 

         * @param aRelationIds  Relations which are removed.

         * @param aResults      In sync with aRelationIds. Result codes, KErrNone if successful,

         *                      KErrGeneral if failed.

         * @param aClient       Response call is done to this object.

         */

        void DoRemoveRelationsL( RArray<TUint32>& aRelationIds,

                RArray<TUint32>& aResults, MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

         * Removes albums asynchronously.

         * 

         * @param aMpxCmd  Media containing command parameters: array with albums IDs.

         * @param aClient  Response call is done to this object.

         */

        void DoRemoveAlbumsL( CMPXMedia* aMpxCmd,

                MVcxMyVideosMdsAlbumsObserver& aClient );

        /**

        * Handles album query responses.

        * 

        * @param aQuery  Query instance.

        * @param aError  <code>KErrNone</code>, if the query was completed

        *                successfully. Otherwise one of the system-wide error 

        *                codes.

        */

        void HandleAlbumQueryCompletedL(CMdEQuery& aQuery, TInt aError);

        /**

        * Handles video query responses.

        * 

        * @param aQuery  Query instance.

        * @param aError  <code>KErrNone</code>, if the query was completed

        *                successfully. Otherwise one of the system-wide error 

        *                codes.

        * @param aFirstNewItemIndex Index of the first new item in the query.

        * @param aNewItemCount      How many new items were added.

        * @param aComplete          ETrue if query is complete, EFalse if new to come.

        */

        void HandleVideoQueryResultsL( CMdEQuery& aQuery, TInt aError,

                TInt aFirstNewItemIndex, TInt aNewItemCount, TBool aComplete );

        /**

         * Handles relation query responses.

         * 

         * @param aQuery Query instance.

         * @param aError  <code>KErrNone</code>, if the query was completed

         *                successfully. Otherwise one of the system-wide error 

         *                codes.

         */

        void HandleRelationQueryCompletedL( CMdEQuery& aQuery, TInt aError );

        /**

         * Called from RunL when video adding to album completes.

         */

        void HandleAddVideosToAlbumCompletedL();

        /**

         * Called from RunL when relations remove completes.

         */

        void HandleRemoveRelationsCompletedL();

        /**

         * Called from RunL when albums remove completes.

         */

        void HandleRemoveAlbumsCompletedL();

        /**

         * Registers observing to MDS session.

         */

        void SetObservingL();

    protected:

        /**

        * From MMdEQueryObserver.

        * Called to notify the observer that new results have been received 

        * in the query.

        *

        * @param aQuery              Query instance that received new results.

        * @param aFirstNewItemIndex  Index of the first new item that was added

        *                            to the result item array.

        * @param aNewItemCount       Number of items added to the result item 

        *                            array.

        */

        void HandleQueryNewResults(CMdEQuery& aQuery,

                TInt aFirstNewItemIndex,

                TInt aNewItemCount);

        /**

        * From MMdEQueryObserver.

        * Called to notify the observer that the query has been completed,

        * or that an error has occured.

        *

        * @param aQuery  Query instance.

        * @param aError  <code>KErrNone</code>, if the query was completed

        *                successfully. Otherwise one of the system-wide error 

        *                codes.

        */

        void HandleQueryCompleted(CMdEQuery& aQuery, TInt aError);

        /**

         * From MMdERelationItemObserver

         */

        void HandleRelationItemNotification(CMdESession& aSession, 

                    TObserverNotificationType aType,

                    const RArray<TMdERelation>& aRelationArray);

        /**

         * From MMdERelationObserver

         */

        void HandleRelationNotification(CMdESession& aSession, 

                TObserverNotificationType aType,

                const RArray<TItemId>& aRelationIdArray);

    private:

        /**

         * Main class for Mds operations. Owns session to MDS.

         */

        CVcxMyVideosMdsDb& iMdsDb;

        /**

         * Observer of albums related events. May be NULL.

         * not own.

         */

        MVcxMyVideosMdsAlbumsObserver* iObserver;

        /**

        * Asynchronous album object fetching query is stored here. Own.

        */

        CMdEObjectQuery* iAlbumQuery;

        /**

        * Asynchronous video object fetching query is stored here. Own.

        */

        CMdEObjectQuery* iVideoQuery;

        /**

        * Asynchronous relation fetching query is stored here. Own.

        */

        CMdERelationQuery* iRelationQuery;

        /**

        * The default namespace definition, not own.

        */

        CMdENamespaceDef* iNamespaceDef;

        /**

        * Album object definition, not own.

        */

        CMdEObjectDef* iAlbumObjectDef;

        /**

        * Album type property definition, not own.

        */

        CMdEPropertyDef* iTypePropertyDef;

        /**

         * "Contains" relation definition, not own.

         */

        CMdERelationDef* iContainsRelationDef;

        /**

        * Pointer to album list which is being fetched from MDS. Not own.

        */

        CMPXMedia* iAlbumList;

        /**

        * Pointer to video list which is being fetched from MDS. Not own.

        */

        CMPXMedia* iVideoList;

        /**

         * When doing some async operation to MDS, the album ID is stored here.

         */

        TUint32 iAlbumId;

        /**

         * When fetching album content from MDS, the pointer to content array is stored here.

         * Only MDS ID is filled to TVideo.

         * Not own.

         */

        RArray<TVcxMyVideosAlbumVideo>* iAlbumContent;

        /**

         * The pending async operation ID is stored here.

         */

        TVcxAsyncOperation iAsyncOperation;

        /**

         * Used for storing items during async mds operations.

         */

        RPointerArray<CMdEInstanceItem> iItemArray;

        /**

         * Used for storing result buffer during async mds operations.

         */

        RMdEDataBuffer iResultBuffer;

        /**

         * Used in async operations to store

         * pointer to result array (which is owned by the user). 

         */

        RArray<TInt>* iResultArray;

        /**

         * Used in async operations to store

         * pointer to result array (which is owned by the user). 

         */

        RArray<TUint32>* iResultArrayUint32;

        /**

         * Used in async oprations (EVcxAddVideosToAlbum and EVcxRemoveVideosFromAlbum) to store

         * pointer to item ID array (which is owned by the user). 

         */

        RArray<TUint32>* iIdArray;

        /**

         * Used to store command parameters during async MDS operations. Not owned.

         */

        CMPXMedia* iMpxCmd;

        /**

         * Used to store pointer to client who initiated the async operation.

         */

        MVcxMyVideosMdsAlbumsObserver* iClient;

    };