/*

* 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:  This class provides the functions to manipulate the podcast collection

*                database.

*

*/

#ifndef MPXPODCASTDBHANDLER_H

#define MPXPODCASTDBHANDLER_H

//  INCLUDES

#include <e32base.h>

#include <f32file.h>

#include <mpxattribute.h>

#include <mpxmediageneraldefs.h>

#include <mpxpodcastdefs.h>

#include "mpxdbcommonstd.h"

#include "mpxpodcastcollectiondbstd.h"

#include "mpxpodcastcollectiondb.hrh"

#include "mpxdbpodcast.h"       // For MMPXDbPodcastObserver

#include "mpxdbactivetask.h"

// FORWARD DECLARATIONS

class CMPXMedia;

class CMPXMediaArray;

class CMPXPodcastDbManager;

class CMPXDbCategory;

class CMPXDbAuxiliary;

// CLASS DECLARATION

/**

*  Podcast collection database handler

*

*  @lib mpxpodcastdbplugin.lib

*/

class CMPXPodcastDbHandler :

    public CBase,

    public MMPXDbPodcastObserver

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aFs file server session

        * @return New CMPXPodcastDbHandler instance

        */

        static CMPXPodcastDbHandler* NewL(RFs& aFs, CMPXResource& aResource);

        /**

        * Two-phased constructor.

        * @param aFs file server session

        * @return New CMPXPodcastDbHandler instance

        */

        static CMPXPodcastDbHandler* NewLC(RFs& aFs, CMPXResource& aResource);

        /**

        * Destructor.

        */

        virtual ~CMPXPodcastDbHandler();

    public:

        /**

        * Add a episode to the podcast collection database

        * @param aMedia media object which contains file path,

        *                  author, name(title), episode no., etc...

        * @return TUint32 id of the item added

        */

        TUint32 AddEpisodeL(const CMPXMedia& aMedia);

        /**

        * Update episode info for a episode in the podcast collection database

        * @param aMedia episode details object  which contains file path,

        *                  author, name(title), episode no., etc...

        * @param aMessageArray resulted change events

        * @return ETrue if the change is UI visible

        */

        CMPXDbActiveTask::TChangeVisibility UpdateEpisodeL(const CMPXMedia& aMedia, CMPXMessageArray& aMessageArray);

        /**

        * Remove all episodes within podcast collection database

        */

        void RemoveEntireCollectionL();

        /**

        * Remove a episode from the podcast collection database

        * @param aEpisodeId ID of the episode to be removed

        * @param aUriArray a descriptor array to contain the URI of the deleted file

        * @param aMessageArray a list of change events as a result of the

        *                             episode removal

        * @param aDeleteRecord indicates whether the client has explictly requested

        *                to delete the records from the database. If ETrue, records

        *                associated with the media will be deleted from the database;

        *                if EFalse, whether to mark the records as deleted or to delete

        *                the records will be based on other deciding factors.

        */

        void RemoveEpisodeL(TUint32 aEpisodeId, CDesCArray& aUriArray,

            CMPXMessageArray& aMessageArray, TBool aDeleteRecord = EFalse);

        /**

        * Removes a category of episodes from the podcast collection, and its

        * corresponding category in the lookup table

        * @param aCategory the category to remove

        * @param aCategoryId ID of the category to remove

        * @param aUriArray a descriptor array to contain the URI of the deleted file(s)

        * @param aMessageArray change events as result of the episode removal

        */

        void RemoveEpisodesMatchingCategoryL(TMPXGeneralCategory aCategory,

            TUint32 aCategoryId, CDesCArray& aUriArray, CMPXMessageArray& aMessageArray);

        /**

        * Removes a publish date category of episodes from the podcast collection

        * @param aCategoryId the publish date cateogry to remove

        * @param aUriArray a descriptor array to contain the URI of the deleted file(s)

        * @param aMessageArray change events as result of the episode removal

        */

        void RemoveEpisodesMatchingPublishDateCategoryL(TUint32 aCategoryId,

            CDesCArray& aUriArray, CMPXMessageArray& aMessageArray);

        /**

        * Delete records in all databases which have been marked as deleted

        */

        void CleanupDeletedRecordsL();

        /**

        * Get all episodes from the podcast collection databasee

        * @param aAttrs Array of attributes to @return

        * @param aMediaArray Array to place all the episodes' required info

        */

        void GetAllEpisodesL(const TArray<TMPXAttribute>& aAttrs,

            CMPXMediaArray& aMediaArray);

        /**

        * Get all the episodes that match the given title ID

        * @param aTitleId ID of the title to match

        * @param aAttrs Array of attributes to return

        * @param aMediaArray Array to place all the matching episodes' required info

        */

        void GetEpisodesMatchingTitleL(TUint aTitleId,

            const TArray<TMPXAttribute>& aAttrs, CMPXMediaArray& aMediaArray);

        /**

        * Get all the episodes that match the given playlist ID.

        * Podcast collection only support Recently Added and Not Yet Played

        * auto playlists.

        * @param aPlaylistId ID of the playlist to match

        * @param aAttrs Array of attributes to return

        * @param aMediaArray Array to place all the required episode info

        * @param aIndexOfCurrentlyPlayingItem index of the currently playing

        *        episode or KErrNotFound (-1) if no currently playing episode within

        *        this playlist

        */

        void GetEpisodesMatchingPlaylistL(TUint aPlaylistId,

            const TArray<TMPXAttribute>& aAttrs, CMPXMediaArray& aMediaArray,

            TInt& aIndexOfCurrentlyPlayingItem);

        /**

        * Get the episode info that matches the given episode ID

        * @param aEpisodeId ID of the episode

        * @param aAttrs Array of attributes to return

        * @param aMediaArray Array to place all the required episode info

        */

        void GetEpisodeL(TUint32 aEpisodeId, const TArray<TMPXAttribute>& aAttrs,

            CMPXMediaArray& aMediaArray);

        /**

        * Get the episode info that matches the given episode ID

        * @aEpisodeId ID of the episode

        * @param aAttrs Array of attributes to return

        * @param aMedia CMPXMedia instance to place all the required song info

        */

        void GetEpisodeL(TUint32 aEpisodeId, const TArray<TMPXAttribute>& aAttrs,

            CMPXMedia& aMedia);

        /**

        * Get the episode ID of the episode that matches the given URI

        * @param aUri URI to match

        * @return Episode ID

        */

        TUint32 GetEpisodeIdMatchingUriL(const TDesC& aUri);

        /**

        * Get all the podcast title names from the podcast collection database

        * @param aAttrs Array of attributes to return

        * @param aMediaArray Array to place all the titles required info

        */

        void GetAllPodcastTitlesL(const TArray<TMPXAttribute>& aAttrs,

            CMPXMediaArray& aMediaArray);

        /**

        * Get all episodes matching the specified publish date

        * @param aPlaylistId the publish date playlist to retrieve

        * @param aAttrs the attributes to return

        * @param aPendingCategoryDeletionFlag true if the episodes within a publish

        *        date category are being retrieved to be deleted

        * @param aMediaArray Array to place all the episode info

        */

        TInt GetEpisodesMatchingPublishPlaylistL(TUint aPlaylistId,

            const TArray<TMPXAttribute>& aAttrs, TBool aPendingCategoryDeletionFlag,

            CMPXMediaArray& aMediaArray);

        /**

        * Get title name using the specified ID

        * @param aId the id of the title to retrieve the name of

        * @return the podcast title matching the specified ID, ownership is transferred

        */

        HBufC* GetTitleNameMatchingIdL(const TUint32 aId);

        /**

        * Get URI from the Id

        * @param aId to search for

        * @return URI matching the ID, ownership is transferred

        */

        HBufC* GetUriMatchingIdL (const TUint32 aId);

        /**

        * Get the duration for all episodes

        * @return duration value

        */

        TInt GetAllEpisodesDurationL();

        /**

        * Get the duration for a specified title

        * @param aTitleId identifies the title

        * @return duration value

        */

        TInt GetTitleDurationL(TUint32 aTitleId);

        /**

        * Get the duration for the episodes not yet played

        * @return duration value

        */

        TInt GetNotPlayedDurationL();

        /**

        * Get the duration for recently added episodes

        * @return duration value

        */

        TInt GetRecentlyAddedDurationL();

        /**

        * Fetch the total number of items in the specified category

        * @param aCategory category to be queried

        * @return number of items.

        */

        TInt NumberOfItemsL(TMPXPodcastCategory aCategory);

        /**

        * Find media(s) from the collection

        * @param aCriteria selection criteria

        * @param aAttrs attributes for the matching media

        * @return matching media. Ownership is transferred.

        */

        CMPXMedia* FindAllLC(const CMPXMedia& aCriteria,

            const TArray<TMPXAttribute>& aAttrs);

        /**

        * Set the last refreshed time

        * @param aTime the updated last refresh time

        */

        void SetLastRefreshedTimeL( TTime aTime );

        /**

        * Get the last refreshed time

        * @return last refreshed time

        */

        TTime GetLastRefreshedTimeL();

        /**

        * Set the db corrupted bit in the aux table for all drives

        * @param aCorrupted flag indicating whether or not the db is corrupted

        */

        void SetDBCorruptedL(TBool aCorrupted);

        /**

        * Get the db corrupted flag

        * @return ETrue if database is corrupted, else EFalse

        */

        TBool IsDBCorruptedL();

        /**

        * Checks if the database has been created

        * @return ETrue if file has been created

        */

        TBool DatabaseCreated();

        /**

        * Close and re-open the podcast collection database stored on the specified drive

        * @param aDrive drive containing the podcast collection database to re-open

        */

        void OpenDatabaseL(TInt aDrive);

        /**

        * Close a database for a particular drive

        * @param aDrive drive to close

        */

        void CloseDatabaseL(TInt aDrive);

        /**

        * Recreate all podcast databases

        */

        void ReCreateDatabasesL();

        /**

        * Start a refresh operation

        */

        void RefreshStartL();

        /**

        * End a refresh operation

        */

        void RefreshEndL();

        /**

        * Sets the value of the IsPlaying field for a given episode

        * @param aMedia contains episode information

        * @param aIsPlaying value of the IsPlaying field

        */

        void SetIsPlayingL(const CMPXMedia& aMedia, TBool aIsPlaying);

        /**

        * Get total record count for podcasts in db

        * @param aDrive, specifies drive number for db selection

        * @return count

        */

        TUint GetTotalCountL(TInt aDrive);

        /**

        * Get URIs for all podcasts

        * @param aDrive, specifies drive number for db selection

        * @param aFromID, specifies last record's unique ID

        * @param aRecords, specifies the number of records to get

        * @param aUriArr, will contain all URIs on return

        * @param aLastID, will contain a unique ID of last record in the array

        */

        void GetPodcastUriArrayL(TInt aDrive, TInt aFromID, TInt aRecords,

                                 CDesCArray& aUriArr, TInt& aLastID);

        /**

        * Starts a transaction

        */

        void BeginTransactionL();

        /**

        * Ends a transaction. Depending on the error code either commits or

        * rollsback the transaction.

        * @param aError error code

        */

        void EndTransactionL(TInt aError);

        /**

        * Checks if the database is currently in a transaction.

        * @return ETrue if database is currently in a transaction, EFalse otherwise

        */

        TBool InTransaction();

        /**

         * Checks if the spefified drive is a remove drive

         */      

        TBool IsRemoteDrive(TDriveNumber aDrive);

    private:

        /**

        * Find media entry/entries from the collection

        * @param aCriteria selection criteria

        * @param aAttrs attributes for the matching media

        * @param aMediaArray array of matching media entry/entries

        */

        void FindAllL(const CMPXMedia& aCriteria, const TArray<TMPXAttribute>& aAttrs,

            CMPXMediaArray& aMediaArray);

        /**

        * Find episode(s) which match(es) the selection criteria

        * @param aCriteria selection criteria

        * @param aAttrs the attributes to include for the artist(s) matching the

        *        selection criteria

        * @param aMediaArray artist(s) matching the selection criteria

        */

        void FindEpisodesL(const CMPXMedia& aCriteria, const TArray<TMPXAttribute>& aAttrs,

            CMPXMediaArray& aMediaArray);

        /**

        * Add an episode to the podcast collection database

        * @param aMedia media object which contains file path, author, name, podcast title etc...

        * @return episode Id of the episode that has been added to the database

        */

        TUint32 DoAddEpisodeL(const CMPXMedia& aMedia);

        /**

        * Update episode info for a episode in the podcast collection database

        * @param aMedia episode details object  which contains file path,

        *               author, name(title), podcast title, etc...

        * @param aItemChangedMessages a list of items changed

        * @return ETrue if UI visible change

        */

        CMPXDbActiveTask::TChangeVisibility DoUpdateEpisodeL(const CMPXMedia& aMedia,

            CMPXMessageArray& aItemChangedMessages);

        /**

        * Remove a episode from the podcast collection database

        * @param aEpisodeId ID of the episode to be removed

        * @param aUriArray a descriptor array to contain the URI of the deleted file

        * @param aMessageArray change events as result of the episode removal

        * @param aDeleteRecord if ETrue the episode will be deleted, if EFalse

        *           it will be marked as deleted

        */

        void DoRemoveEpisodeL(TUint32 aEpisodeId, CDesCArray& aUriArray,

            CMPXMessageArray& aMessageArray, TBool aDeleteRecord);

        /**

        * Remove the episodes for a category from the podcast collection database

        * @param aCategory category type

        * @param aCategoryId category item

        * @param aUriArray a descriptor array to contain the URI of the deleted file

        * @param aMessageArray change events as result of the episode removal

        */

        void DoRemoveEpisodesMatchingCategoryL(TMPXGeneralCategory aCategory,

            TUint32 aCategoryId, CDesCArray& aUriArray, CMPXMessageArray& aMessageArray);

        /**

        * Remove the episodes for a publish date category

        * @param aCategoryId identifies the publish date category

        * @param aUriArray a descriptor array to contain the URI of the deleted file

        * @param aMessageArray change events as result of the episode removal

        */

        void DoRemoveEpisodesMatchingPublishDateCategoryL(TUint32 aCategoryId,

            CDesCArray& aUriArray, CMPXMessageArray& aMessageArray);

        /**

        * Delete records in all databases which have been marked as deleted

        */

        void DoCleanupDeletedRecordsL();

        /**

        * Makes sure all the folders specified in the array parameter are created,

        * otherwise it tries to create them. Updates the iDbDrives member variable

        * with the drives corresponding to the folders.

        * @param aFolders contains all the folders to be processed

        */

        void ProcessPodcastFoldersL(const CDesCArray& aFolders);

        /**

        * Returns the CMPXDbCategory instance associated with the specified

        * category type

        * @param aCategory category type

        * @return corresponding CMPXDbCategory instance

        * @leave KErrNotSupported if invalid category

        */

        CMPXDbCategory* DbCategoryL(TMPXGeneralCategory aCategory) const;

        /**

        * Verify the volume id for the databases

        */

        void VerifyVolumeIdL( TInt aDrive );

        void VerifyVolumeIdL();

        /**

         * Checks if there is a drive that has a low disk space

         * @leave KErrDiskFull if the space on one of the drives is below the

         *         critical level

         */

        void CheckDiskSpaceOnDrivesL();

#if defined (__MTP_PROTOCOL_SUPPORT)

        /**

        * Reads the "save deleted records" MTP flag from CenRep and returns

        * the value.

        * @return value of the "save deleted records" MTP flag

        */

        TBool SaveDeletedSongs();

#endif

#ifdef RD_MULTIPLE_DRIVE

        /**

        * Retrieve all visible podcast folder locations

        */

        CDesCArrayFlat* GetPodcastFoldersL();

#endif // RD_MULTIPLE_DRIVE

    private:    // From MMPXDbPodcastObserver

        /**

        * @see MMPXDbPodcastObserver

        */

        TUint32 AddCategoryItemL(TMPXGeneralCategory aCategory, const TDesC& aName,

            TInt aDriveId, CMPXMessageArray* aItemChangedMessages);

        /**

        * @see MMPXDbPodcastObserver

        */

        void DeleteEpisodeForCategoryL(TMPXGeneralCategory aCategory, TUint32 aCategoryId,

            TInt aDriveId, CMPXMessageArray* aItemChangedMessages);

    private:

        /**

        * C++ constructor

        * @param file session

        */

        CMPXPodcastDbHandler(RFs& aFs, CMPXResource& aResource);

        /**

        * Symbian 2nd phase constructor..

        */

        void ConstructL();