/*

* Copyright (c) 2006-2007 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:  Thumbnail server

 *

*/

#ifndef THUMBNAILSERVER_H

#define THUMBNAILSERVER_H

#include <e32base.h>

#include <fbs.h>

#include <w32std.h>

#include <apmrec.h>

#include <apgcli.h>

#include <e32hashtab.h>

#include <mdesession.h>

#include "thumbnailmanager.h"

#include "thumbnailmanagerconstants.h" // TThumbnailServerRequestId

#include "thumbnailstore.h"     // TThumbnailPersistentSize

#include "tmshutdownobserver.h"

// Needed for creating server thread.

const TUint KDefaultHeapSize = 160 * 1024;

class CThumbnailTaskProcessor;

class CThumbnailProvider;

class CThumbnailTask;

class CThumbnailStore;

class MIHLScaler;

class CThumbnailServerSession;

class CThumbnailDiskUnmountObserver;

class CThumbnailMemoryCardObserver;

/**

 * Helper function to destroy all objects which are referred to

 * by pointers in a hash table.

 * @since S60 v5.0

 * @param aHashMap Reference to hash map

 */

template <class K, class V> void ResetAndDestroyHashMap( RHashMap<K, V* > &

    aHashMap )

    {

    THashMapIter<K, V* > iter( aHashMap );

    // const pointer to a non-const object

    V* const * item = iter.NextValue();

    while ( item )

        {

        delete * item;

        item = iter.NextValue();

        }

    aHashMap.Close();

    }

/**

 *  Thumbnail server.

 *

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CThumbnailServer ): public CPolicyServer,

                                       public MMdESessionObserver,

    {

public:

    /**

     * Two-phased constructor

     *

     * @since S60 v5.0

     * @return New CThumbnailServer server.

     */

    static CThumbnailServer* NewL();

    /**

     * Destructor

     *

     * @since S60 v5.0

     */

    virtual ~CThumbnailServer();

public:

    /**

     * Creates new server session.

     *

     * @since S60 v5.0

     * @param aVersion Version info.

     * @param aMessage Message to be passed.

     * @return New session.

     */

    CSession2* NewSessionL( const TVersion& aVersion, const RMessage2& aMessage

        )const;

    /**

     * ThreadFunctionL

     *

     * @since S60 v5.0

     */

    static void ThreadFunctionL();

    /**

     * AddSession

     *

     * @since S60 v5.0

     */

    void AddSession();

    /**

     * DropSession

     *

     * @since S60 v5.0

     */

    void DropSession(CThumbnailServerSession* aSession);

    // from MMdESessionObserver

    void HandleSessionOpened( CMdESession& aSession, TInt aError );

    void HandleSessionError( CMdESession& aSession, TInt aError );    

    // from MTMShutdownObserver

    void ShutdownNotification();

    /**

     * Adds bitmap to bitmap pool. Server assumes ownership of the bitmap and

     * implements reference counting to know when it is safe to delete

     * the object. Reference count is increased if the bitmap already

     * exists in the pool.

     *

     * @since S60 v5.0

     * @param aSession Server side session which owns the bitmap.

     * @param aBitmap Bitmap to be added to pool.

     */

    void AddBitmapToPoolL( CThumbnailServerSession* aSession, CFbsBitmap*

    /**

     * Store thumbnail.

     *

     * @since S60 v5.0

     * @param aPath Image path.

     * @param aBitmap Thumbnail image.

     * @param aOriginalSize Original size of image.

     * @param aCropped Enabled if the thumbnail was cropped.

     * @param aThumbnailSize Prededined size of requested thumbnail.

     * @param aThumbFromPath Thumbnail created from associated path.

     * @param aThumbFromPath Check first if source uri exists.

     */

    void StoreThumbnailL( const TDesC& aPath, CFbsBitmap* aBitmap, const TSize&

        aOriginalSize, const TBool aCropped, const TThumbnailSize aThumbnailSize,

        const TThumbnailId aThumbnailId, const TBool aThumbFromPath = ETrue,

        const TBool aCheckExist = ETrue);

    /**

     * Fetch thumbnail image.

     *

     * @since S60 v5.0

     * @param aPath Path of the media object whose thumbnail is to be

     *              retrieved.

     * @param aThumbnail Pointer to get the fetched thumbnail bitmap.

     *                   Caller assumes ownership.

     * @param aMinimumSize Minimum size of the thumbnail.

     * @param aOriginalSize Original size of the object file in pixels

     * @param aCropped If true, match cropped images only.

     * @param aAllowUpscaling If enabled, allow fetching thumbnails that

     *                        are smaller than requested.

     * @param aThumbnailSize Prededined size of requested thumbnail.

     */

    void FetchThumbnailL( const TDesC& aPath, CFbsBitmap* & aThumbnail, 

             TDesC8* & aData, const TThumbnailSize aThumbnailSize, TSize &aOriginalSize );

    /**

     * Fetch thumbnail image.

     *

     * @since S60 v5.0

     * @param aThumbnailId ID of the media object whose thumbnail is to be

     *              retrieved.

     * @param aThumbnail Pointer to get the fetched thumbnail bitmap.

     *                   Caller assumes ownership.

     */    

    void FetchThumbnailL( TThumbnailId aThumbnailId, CFbsBitmap* &

        aThumbnail, TDesC8* & aData, TThumbnailSize aThumbnailSize, TSize &aOriginalSize );

    /**

     * Delete thumbnails.

     *

     * @since S60 v5.0

     * @param aPath           Path of the media object whose thumbnail is

     *                        to be deleted.

     */

    void DeleteThumbnailsL( const TDesC& aPath );

    /**

     * Delete thumbnails by Id.

     *

     * @since S60 v5.0

     * @param aItemId         Id of item whose thumbnails are to be deleted.

     */

    void DeleteThumbnailsByIdL( TThumbnailId aItemId );    

    /**

     * Resolve the MIME-type of given file using recognizer framework.

     *

     * @since S60 v5.0

     * @param aFile File to be recognized.

     * @return MIME-type

     */

    TDataType ResolveMimeTypeL( RFile& aFile );

    /**

     * Removes bitmap from bitmap pool. Reference count is decremented

     * and if it reaches zero, the bitmap object is deleted.

     *

     * @since S60 v5.0

     * @param aHandle Bitmap handle.

     */

    void DeleteBitmapFromPool( TInt aHandle );

    /**

     * Resolve plugin to be used in thumbnail creation by mime type.

     *

     * @since S60 v5.0

     * @param aMimeType Mime type of the file from which a thumbnail is to be

     *                  created.

     * @return Thumbnail provider.

     */

    CThumbnailProvider* ResolveProviderL( const TDesC8& aMimeType );

    /**

     * Add thumbnailtask to processor queue.

     *

     * @since S60 v5.0

     * @param aTask Task to be added to queue.

     */

    void QueueTaskL( CThumbnailTask* aTask );

    /**

     * Remove thumbnailtask from processor queue.

     *

     * @since S60 v5.0

     * @param aRequestId ID of the task to be removed from queue.

     * @return Error code.

     */

    TInt DequeTask( const TThumbnailServerRequestId& aRequestId );

    /**

     * Change priority of specific task.

     *

     * @since S60 v5.0

     * @param aRequestId ID of the task to be assigned new priority.

     * @param aNewPriority New priority for the task.

     * @return Error code.

     */

    TInt ChangeTaskPriority( const TThumbnailServerRequestId& aRequestId, TInt

        aNewPriority );

    /**

     * Scale bitmap

     *

     * @since S60 v5.0

     * @param aStatus      Request status.

     * @param aSource      Source bitmap.

     * @param aDest        Destination bitmap.

     * @param aSourceRect  Source rectangle for cropping.

     */

    void ScaleBitmapL( TRequestStatus& aStatus, const CFbsBitmap& aSource,

        CFbsBitmap& aDest, const TRect& aSourceRect );

    /**

     * Cancel scaling operation

     *

     * @since S60 v5.0

     */

    void CancelScale();

    /**

     * Returns processor.

     *

     * @since S60 v5.0

     * @return Reference to processor instance.

     */

    CThumbnailTaskProcessor& Processor();

    /**

     * Get persistent size.

     *

     * @since S60 v5.0

     * @param aThumbnailSize Relative thumbnail size 

     * @return Persistent size object

     */    

    TThumbnailPersistentSize & PersistentSizeL( TThumbnailSize

            aThumbnailSize ); 

    /**

     * Persistent sizes.

     *

     * @since S60 v5.0

     * @return List of thumbnail sizes (including othe parameters) which

     *         are stored for later access.

     */

    RArray < TThumbnailPersistentSize > PersistentSizesL();

    /**

     * Get missing thumbnail sizes.

     *

     * @since S60 v5.0

     * @param aPath Path associated to missing thumbnails

     * @param aMissingSizes Returns a list of thumbnail sizes not yet create related to the path

     */

    void GetMissingSizesAndIDsL( const TDesC& aPath, TInt aSourceType, RArray <

        TThumbnailPersistentSize > & aMissingSizes, TBool& aMissingIDs);

    /**

     * Fileserver

     *

     * @since S60 v5.0

     * @return File server

     */

    RFs& Fs();

    /**

     * Get the required size (in characters) for a buffer that contains the

     * list of supported MIME types

     * 

     * @since S60 v5.0

     */

    TInt GetMimeTypeBufferSize()const;

    /**

     * Get the list of supported MIME types and store them in the buffer.

     *

     * @since S60 v5.0

     * @param aBuffer A buffer to receive the space delimited list of MIME

     *                types. Must be as least as large as the size returned

     *                by GetMimeTypeBufferSizeL()

     */

    void GetMimeTypeList( TDes& aBuffer )const;

    /**

     * Close store instance for given drive.

     *

     * @since S60 v5.0

     * @param aDrive Drive for which the store is used, such as EDriveC,

     *               EDriveE, etc.

     */

    void CloseStoreForDriveL( const TInt aDrive );     

    /**

     * React to change in memory card status.

     *

     * @since S60 v5.0     

     */

    void MemoryCardStatusChangedL();

    /**

     * Update thumbnails in database

     *

     * @since S60 v5.0

     * @param aItemId       TThumbnailId

     * @param aPath         (New) path for the Thumbnail

     * @param aOrientation  Thumbnail orientation

     * @param aModified     Last modified

     * @param TBool         EFalse, if new thumbs need to be created

     */  

    TBool UpdateThumbnailsL( const TThumbnailId aItemId, const TDesC& aPath,

                             const TInt aOrientation, const TInt64 aModified );

    /** 

     * Resolve mime type from file extension

     *

     * @since S60 v5.0     

     * @param aFileName Image file

     * @param aMimeType Mime type

     * @return TInt KErrNone/KErrNotFound

     */

    TInt MimeTypeFromFileExt( const TDesC& aFileName, TDataType& aMimeType );

    /** 

     * Resolve source type from mime type

     *

     * @since S60 v5.0     

     * @param aMimeType Mime type

     * @return TInt TThumbnailPersistentSize enum

     */

    TInt SourceTypeFromMimeType( const TDataType& aMimeType );

    /** 

     * Resolve source type from size type

     *

     * @since S60 v5.0     

     * @param aSizeType size type enum

     * @return TInt TThumbnailPersistentSize enum

     */

    TInt SourceTypeFromSizeType( const TInt aSizeType );

    /** 

     * Is mime type supported

     *

     * @since S60 v5.0     

     * @param aMimeType Mime type

     * @return TBool supported

     */

    TBool SupportedMimeType( const TDataType& aMimeType );    

    /** 

     * Get MDS session

     *

     * @since S60 v5.0     

     * @return CMdESession

     */

    CMdESession* GetMdESession();

    /**

     * Get store instance for given path.

     *

     * @since S60 v5.0

     * @param aPath Path to a file

     * @return CThumbnailStore object

     */

    CThumbnailStore* StoreForPathL( const TDesC& aPath );  

    /**

     * Update ID in database

     *

     * @since S60 v5.0

     * @param aItemId Id of item whose thumbnails are to be updated.

     * @param aNewPath Path property of the object to be updated.

     */  

    void UpdateIDL( const TDesC& aPath, const TThumbnailId aNewId );

    /**

     * Close Removable Stores

     *

     * @since S60 v5.0

     */  

    void CloseRemovableDrivesL();

    /**

     * Open Removable Stores

     *

     * @since S60 v5.o

     */  

    void OpenRemovableDrivesL();

    /**

     * Checks if formatting is ongoing

     *

     * @since S60 v5.o

     */ 

    TBool IsFormatting();

protected: // Functions from base classes

    /**

    * From CPolicyServer.

    * Handles capability checking for certain server requests.

    * @param aMsg  Message which was received from the client side

    * @param aAction  

    * @param aMissing

    * @result return one of TCustomResult set {EPass, EFail, EAsync}.

    */

    CPolicyServer::TCustomResult CustomSecurityCheckL( 

        const RMessage2 &aMsg, TInt &aAction, TSecurityInfo &aMissing );

    /**

    * From CPolicyServer.

    * Handles failure

    * @param aMsg  Message which was received from the client side

    * @param aAction  

    * @param aMissing

    * @result return one of TCustomResult set {EPass, EFail, EAsync}.

    */

    CPolicyServer::TCustomResult CustomFailureActionL(

        const RMessage2 &aMsg, TInt aAction, const TSecurityInfo &aMissing );

private:

    /**

     * Get a provider plug-in by the given UID

     *

     * @since S60 v5.0

     * @param aImplUid UID of the provider plug-in.

     * @return Provider instance.

     */

    CThumbnailProvider* GetProviderL( const TUid& aImplUid );

    /**

     * Get store instance for given drive.

     *

     * @since S60 v5.0

     * @param aDrive Drive for which the store is used, such as EDriveC,

     *               EDriveE, etc.

     * @return CThumbnailStore object

     */

    CThumbnailStore* StoreForDriveL( const TInt aDrive );

    /**

     * Add unmount observer for each unmountable drive.

     *

     * @since S60 v5.0

     */

    void AddUnmountObserversL();

    /**