/*

* 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 "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:  This class is responsible for all category tables (Artist,

*                Album, Genre, Composer).

*

*

*/

#ifndef MPXDBALBUM_H

#define MPXDBALBUM_H

// INCLUDES

#include "mpxdbcategory.h"

// CLASS DECLARATION

class MMPXDbAlbumObserver

    {

    public:

        virtual TInt HandleIsUnknownArtistL(TUint32 aId) = 0;    

        virtual TUint32 HandleArtistForAlbumL( const TUint32 aId ) = 0;

    };

/**

* Responsible for managing all music databases

*

* @lib MPXDbPlugin.lib

*/

class CMPXDbAlbum :

    public CMPXDbCategory

    {

    public:

        /**

        * Two-phased constructor.

        * @param aDbManager database manager to use for database interactions

        * @param aCategory identifies the category

        * @return New CMPXDbCategory instance.

        */

        static CMPXDbAlbum* NewL(CMPXDbManager& aDbManager,

            TMPXGeneralCategory aCategory, MMPXDbAlbumObserver& aObserver);

        /**

        * Two-phased constructor.

        * @param aDbManager database manager to use for database interactions

        * @param aCategory identifies the category

        * @return New CMPXDbCategory instance on the cleanup stack.

        */

        static CMPXDbAlbum* NewLC(CMPXDbManager& aDbManager,

            TMPXGeneralCategory aCategory, MMPXDbAlbumObserver& aObserver);

        /**

        * Destructor

        */

        virtual ~CMPXDbAlbum();

    public:

        /**

        * Add a category item. If the record already exists, its counter will

        * be incremented.

        * @param aName: This is the name to be entered into the row

        * @param aDriveId: The Drive Id the name (category) belongs

        * @param aNewRecord: indicates to the caller if a new record is created.

        *        ETrue if a new row is created in the table; otherwise EFalse.

        * @param aCaseSensitive indicates whether case sensitivity should be taken

        *        into consideration when generating the unique row id

        * @return The unique id of the row added.

        */

        TUint32 AddItemL(const TDesC& aName, TUint32 aArtist, const TDesC& aArt, TInt aDriveId, TBool& aNewRecord,

            TBool aCaseSensitive = ETrue);

        /**

        * Decrement the number of songs for the item. If the count gets to 0, remove

        * the item.

        * @param aId: The ID of the category to delete.

        * @param aDriveId: The drive Id the name (category) belongs to. Songs on different

        *                  drives may belong to the same album or artist; consequently, one

        *                  row for each artist/album id and drive ID pair will exist in the

        *                  lookup table with a count existing for each row that tracks the

        *                  number number of songs on that drive with that album/artist.

        * @param aItemChangedMessages if valid on return contains a deleted message if the

        *                  category was deleted

        * @param aItemExist Out parameter, ETrue if the category is not deleted after the delete,

        *        EFalse otherwise

		* @param aArtist: The ID of the artist

        */

        void DecrementSongsForCategoryL(TUint32 aId, TInt aDriveId,

            CMPXMessageArray* aItemChangedMessages, TBool& aItemExist, const TUint32 aArtist);

		/**

	* Gets the details for all category items.

	* @param aAttrs attributes to be returned

	* @param aMediaArray returns the requested attributes for all items

	*/

		void GetAllCategoryItemsL(const TArray<TMPXAttribute>& aAttrs,

			CMPXMediaArray& aMediaArray);

		/**

	* Update a category item. 

	* @param aId: The ID of the category to update

	* @param aMedia: The media data

	* @param aDriveId: The Drive Id the name (category) belongs

	* @param aItemChangedMessages: if valid on return contains a updated message if the

    *        category was updated

	*/

		void UpdateItemL(TUint32 aId, const CMPXMedia& aMedia, TInt aDriveId, CMPXMessageArray* aItemChangedMessages);

	public:

		/**

	* Get albums count for a specified artist

	* @param aId: The ID of the artist

	*/		

	    TInt GetAlbumsCountForArtistL(TUint32 aArtistId);

		/**

	* Get songs count for a specified album and a specified artist

	* @param aArtistId: The ID of the artist

	* @param aAlbumId: The ID of the album

	*/		

		TInt GetSongsCountInAlbumMatchingArtistL(TUint32 aArtistId, TUint32 aAlbumId);

    private:	

        /**

        * Updates the media with information from the table

        * @param aRecord record containing the source fields

        * @param aAttrs attributes to be returned

        * @param aMedia returns the requested attributes

        */

        void UpdateMediaL(RSqlStatement& aRecord, const TArray<TMPXAttribute>& aAttrs,

            CMPXMedia& aMedia);

         /**

        * Generate searching criteria for album table from the given criteria

        * @param aMedia media data

        * @param aFields fields of Album table

        * @param aValues values of each field of Album table

        * @return a string containing the selection criteria. The ownership is passed to the caller.

        */

		void GenerateAlbumFieldsValuesL(const CMPXMedia& aMedia, 

			CDesCArray& aFields, CDesCArray& aValues);

		TBool IsUnknownArtistL(TUint32 aId);

		TUint32 ArtistForAlbumL(const TUint32 aId);

    private:    // from MMPXTable

        /**

        * @see MMPXTable

        */

        virtual void CreateTableL(RSqlDatabase& aDatabase, TBool aCorruptTable);

        /**

        * @see MMPXTable

        */

        virtual TBool CheckTableL(RSqlDatabase& aDatabase);

    private:

        /**

        * C++ constructor.

        * @param aDbManager database manager to use for database interactions

        * @param aCategory identifies the category

        */

        CMPXDbAlbum(CMPXDbManager& aDbManager, TMPXGeneralCategory aCategory, MMPXDbAlbumObserver& aObserver);

        /**

        * Second phase constructor.

        */

        void ConstructL();

    public:

        /**

        * Column indexes in the category tables

        */

        enum TAlbumColumns

            {

            EAlbumUniqueId = KMPXTableDefaultIndex,

            EAlbumName,

            EAlbumSongCount,

            EAlbumArtist,

            EAlbumArt,

            EAlbumArtistName,

            EAlbumFieldCount

            };

    private:    // Data

        MMPXDbAlbumObserver& iObserver;

    };

#endif // MPXDBALBUM_H

// End of File