/*

* 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:    Categories related functionality*

*/

#ifndef VCXMYVIDEOSCATEGORIES_H

#define VCXMYVIDEOSCATEGORIES_H

// INCLUDES

#include <vcxmyvideosdefs.h>

// FORWARD DECLARATIONS

class CMPXMedia;

class CVcxMyVideosCollectionPlugin;

// CONSTANTS

// CLASS DECLARATION

/**

* MPX My Videos collection categories implementation.

*

* @lib mpxmyvideoscollectionplugin.lib

*/

NONSHARABLE_CLASS(CVcxMyVideosCategories) : CBase

    {    

    public: // Constructors and destructor

        /**

        * Two-phased constructor

        * @return object constructed

        */

        static CVcxMyVideosCategories* NewL ( CVcxMyVideosCollectionPlugin& aCollection );

        /**

        * Destructor

        */

        virtual ~CVcxMyVideosCategories();

        /**

        * Creates Media container with categories.

        */

        CMPXMedia* CreateCategoryListL();

    public: // new methods

        /**

        * When CVcxMyVideosVideoCache::iCache->iVideoList is grown (appended),

        * this is called to update category attributes.

        *

        * @param aVideoList          Current video list cache.

        * @param aNewItemsStartIndex Start position of new items.

        */

        void UpdateCategoriesL( CMPXMedia& aVideoList, TInt aNewItemsStartIndex );

        /**

        * Called after video is added to iCollection.iCache.

        * Updates category variables accordingly.

        * Modify events to iCollection.iMessageList are added, but the list

        * is not sent.

        *

        * @param aMdsId Item which was added.

        */

        void VideoAddedL( TUint32 aMdsId );

        /**

        * Called after video is added to iCollection.iCache.

        * Updates category variables accordingly.

        * Modify events to iCollection.iMessageList are added, but the list

        * is not sent.

        *

        * @param aVideo Item which was added.

        */

        void VideoAddedL( CMPXMedia& aVideo );

        /**

        * Called after videos are added to iCollection.iCache.

        * Updates category variables accordingly.

        * Modify events to iCollection.iMessageList are added, but the list

        * is not sent.

        *

        * @param aIds Items which were added.

        */

        void VideosAddedL( RArray<TUint32>& aIds );

        /**

        * Called just _before_ video is removed from iCollection.iCache.

        * Updates category variables accordingly.

        * Modify events to iCollection.iMessageList are added, but the list

        * is not sent.

        *

        * @param aMdsId Item which is being removed.

        */

        void VideoRemovedL( TUint32 aMdsId );

        /**

        * Called just _before_ video is removed from iCollection.iCache.

        * Updates category variables accordingly.

        * Modify events to iCollection.iMessageList are added, but the list

        * is not sent.

        *

        * @param aVideo Item which is being removed.

        */

        void VideoRemovedL( CMPXMedia& aVideo );

        /**

        * Called just _before_ videos are removed from iCollection.iCache.

        * Updates category variables accordingly.

        * Modify events to iCollection.iMessageList are added, but the list

        * is not sent.

        *

        * @param aIds Items which are being removed.

        */

        void VideosRemovedL( RArray<TUint32>& aIds );

        /**

        * Resets video counters to 0 from categories. Does not

        * send events.

        */

        void ResetVideoCountersL();

        /**

        * Updates categories' New Video Name fields.

        * Sends iCollection.iMessageList if any of the categories is modified.

        */

        void UpdateCategoriesNewVideoNamesL();

        /**

        * Called when video is updated in a way it affects New Video Name (and date) in category.

        * This updates the category accordinly. This function adds modify events to

        * collections message list if category is edited. Does not flush the message list.

        *

        * @param aVideo     Video which was changed.

        * @param aModified  Set to ETrue if categories were modified.

        */

        void UpdateCategoryNewVideoNameAndDateL( CMPXMedia& aVideo, TBool& aModified );

        /**

        * Called when items New Video Flag is updated in iCollection.iCache.

        * This function updates video counters only, no New Video Name.

        *

        * @param aOldFlags  Items flags before update.

        * @param aNewFlags  Items flags after update.

        * @param aOrigin    Which origin is affected.

        * @param aModified  Set to ETrue if category counters were edited and events

        *                   were added to message list. This does not flush the message list.

        */

        void NewVideoFlagChangedL( TUint32 aOldFlags, TUint32 aNewFlags,

                TUint8 aOrigin, TBool& aModified );        

        /**

        * Checks in which categories the video belongs to and sends modified events for them.

        *

        * @param aVideo             Video which was modified.

        * @param aFlushMessageList  If ETrue, then the collections message list is sent to clients.

        * @param aExtraInfo         Extra information about the event, this value is written to

        *                           KVcxMediaMyVideosInt32Value attribute. If aExtraInfo

        *                           is 0, nothing is written.

        */

        void GenerateCategoryModifiedEventL( CMPXMedia& aVideo, TBool aFlushMessageList,

                TInt32 aExtraInfo = 0 );

        /**

        * Called when videos origin is changed in iCollection.iCache.

        * Updates category variables and sends necessarry events.

        *

        * @param aVideo       Video which is changed, flags variable is read from here.

        * @param aPrevOrigin  Previous origin.

        * @param aNewOrigin   New origin.

        */

        void OriginChangedL( CMPXMedia& aVideo, TUint8 aPrevOrigin, TUint8 aNewOrigin );

    private:

        /**

        * Constructor

        */

        CVcxMyVideosCategories( CVcxMyVideosCollectionPlugin& aCollectionPlugin );

        /**

        * Symbian 2nd phase constructor.

        */

        void ConstructL ();

        /**

        * Creates CMPXMedia object with category values and appends it to

        * aCategoryArray.

        *

        * @param aTitle         Category title.

        * @param aId            Collection item ID

        * @param aCategoryArray New CMPXMedia category object is appended here. 

        */

        void AppendCategoryToArrayL( const TDesC& aTitle, TMPXItemId aId,

                CMPXMediaArray& aCategoryArray );

        /**

        * Updates video counts in categories.

        *

        * @param aCategoryArray       Category array, provided as function parameter since the

        *                             calling function already has it available.

        * @param aVideosIncrements    How many new items were added to each category.

        * @param aNewVideosIncrements How many videos with new flag were added to each category.

        */

        void UpdateVideosCountL( CMPXMediaArray& aCategoryArray,

        /**

        * Increases/decreases aCountAttribute in aCategory. Adds event to

        * iCollection.iMessageList if category is modified. aEventInfo is written

        * to event's extra info. Does not flush iCollection.iMessageList.

        *

        * @param aCategory       Category being modified.

        * @param aIncrement      This is added to category's current attribute value.

        * @param aCountAttribute Attribute ID.

        * @param aEventInfo      This is written to generated event's extra info attribute.

        * 

        */

        void UpdateVideosCountL( CMPXMedia& aCategory, TInt aIncrement,

                TMPXAttributeData aCountAttribute, TInt aEventInfo );

        /**

        * aVideo is added(or removed) to aCategory. Updates category variables accordingly. 

        *

        * @param aCategory      Category

        * @param aCategoryIndex Category index in iList

        * @param aAdded         ETrue if aVideo was added to iList, EFalse if being removedo.

        */

        void UpdateCategoryL( CMPXMedia& aCategory, TInt aCategoryIndex,

                CMPXMedia& aVideo, TBool aAdded );

        /**

        * Adds aAddition to aAttribute in aCategory.

        *

        * @param aCategory  Category to modify.

        * @param aAddition  How much increase/decrease the attribute.

        * @param aAttribute Which attribute to modify.

        */

        void AddToTUint32AttributeL( CMPXMedia& aCategory, TInt aAddition,

                TMPXAttributeData aAttribute );

        /**

        * Returns the corresponding category index in category list (=iList) for aOrigin.

        * Notice that category index is the same as categorys MPXIDs iId1 value.

        * They should be kept the same.

        *

        * @param aOrigin  Origin, see values from TVcxMyVideosOrigin, if -1 given, then

        *                 index for All category is returned.

        * @return         Index in category list (=iList)

        */

        TInt CategoryIndex( TInt aOrigin );

        /**

        * Updates categorys New Video Name and Creation date fields. Sets aModified to

        * ETrue if value is changed, also adds modify event to event list,

        * but does not send it.

        *

        * @param aOrigin     Identifies the category, -1 is used for All category.

        * @param aModified   Set to ETrue if category item is modified. Otherwise

        *                    the value is not touched.

        * @param aIgnoredIds Items with these MDS ids are ignored on the update.

        *                    Usefull if items are being deleted but are still on the

        *                    video list.

        */

        void UpdateCategoryNewVideoNameAndDateL( TInt aOrigin, TBool& aModified,

                RArray<TUint32>& aIgnoredIds );

        /**

        * Goes through aVideoList and checks all videos which have new video

        * flag set and returns the latest ones name. Pointer to latest video

        * object is written to aNewVideo.

        *

        * @param aVideoList  Video list

        * @param aOrigin     Can be used to filter search. Only items which have

        *                    matching origin are included to the operation.

        *                    If -1, then all items are included.

        * @param aIgnoredIds Items with these MDS ids are ignored on the update.

        *                    Usefull if items are being deleted but are still on the

        *                    video list.

        * @param aNewVideo   Pointer to media object containing the new video name is

        *                    written here. NULL is written if not found. Ownership

        *                    does not move (stays in aVideoList).

        *                   

        */

        const TDesC& CalculateNewVideoNameL( CMPXMedia& aVideoList, TInt aOrigin,

                RArray<TUint32>& aIgnoredIds, CMPXMedia*& aNewVideo );

        /**

        * Video was added or is being removed in iCollection.iCache. Update

        * Categories accordingly.

        *

        * @param aMdsId Item which was added or removed.

        * @param aAdded ETrue if add operation, EFalse if remove.

        */

        void VideoAddedOrRemovedL( TUint32 aMdsId, TBool aAdded );

        /**

        * Video was added or is being removed in iCollection.iCache. Update

        * Categories accordingly.

        *

        * @param aVideo Item which was added or removed.

        * @param aAdded ETrue if add operation, EFalse if remove.

        */

        void VideoAddedOrRemovedL( CMPXMedia& aVideo, TBool aAdded );

        /**

        * Videos were added or are being removed in iCollection.iCache. Update

        * Categories accordingly.

        *

        * @param aIds Items which were added or are being removed.

        * @param aAdded ETrue if add operation, EFalse if remove.

        */

        void VideosAddedOrRemovedL( RArray<TUint32>& aIds, TBool aAdded );

        /**

        * Resets iModifiedCategories

        */

        void ResetModifiedCategoriesArray();

        /**

        * Creates events from iModifiedCategories and adds them

        * to iCollection.iMessageList. Does not send.

        */

        void AddEventsFromModifiedCategoriesArrayL();

    public:

        /**

        * Contains category list, this is kept in memory to speed things up.

        * Own.

        */

        CMPXMedia* iList;

        /**

        * Media array of iList, owned by iList.

        */

        CMPXMediaArray* iListArray;

    private:

        /**

        * Owner of this object.

        */

        CVcxMyVideosCollectionPlugin& iCollection;

        /**

        * Array containing boolean for each category, if set ETrue, then modified event

        * has been added for the category (to iCollection.iMessageList).

        */

        RArray<TBool> iModifiedCategories;

    };

#endif   // VCXMYVIDEOSCATEGORIES_H