/*

* 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: 

*

*/

#ifndef VCXMYVIDEOSDOWNLOADUTIL_H

#define VCXMYVIDEOSDOWNLOADUTIL_H

// INCLUDES

#include <downloadmgrclient.h>

#include <mpxmedia.h>

#include <vcxmyvideosdefs.h>

#include <ipvideo/vcxconnutilengineobserver.h>

#include "vcxmyvideostimer.h"

// FORWARD DECLARATIONS

class CVcxConnectionUtility;

class CMediatorEventProvider;

class RFs;

// CONSTANTS

const TInt KVcxSubDirLevels     = 2;

const TInt KVcxMaxSubDirLength  = 10;    

const TInt KVcxMaxSubDirsLength = KVcxMaxSubDirLength * KVcxSubDirLevels;

const TInt KVcxMaxItemsInDir    = 100;

// CLASS DECLARATION

NONSHARABLE_CLASS(MVcxMyVideosDownloadUtilObserver)

    {

    public:

        /**

        * Event handler which client must implement.

        *

        * @param aDownloadId           Download ID in Download Manager.

        * @param aProgress             Download progress, 0-100.

        * @param aDownloaded           Current file size, in bytes.

        * @param aDownloadError        If download goes to failed state, this contains the reason code

        *                              otherwise 0.

        * @param aDownloadGlobalError  if download goes to failed state, this contains the global reason

        *                              code, otherwise 0.

        */

        virtual void HandleDlEvent( TVcxMyVideosDownloadState aState,

                TUint32 aDownloadId,

                TInt aProgress,

                TInt64 aDownloaded,

                TInt32 aDownloadError,

                TInt32 aDownloadGlobalError ) = 0;

    };

/**

* Download related stuff.

*

* @lib mpxmyvideoscollectionplugin.dll

*/

NONSHARABLE_CLASS(CVcxMyVideosDownloadUtil) :

    public CBase,

    public MHttpDownloadMgrObserver,

    public MVcxMyVideosTimerObserver,

    public MConnUtilEngineObserver

    {    

    public: // Constructors and destructor

        /**

        * Two-phased constructor

        * @param aObserver Observer

        * @param aFs       File server session.

        * @return          Object constructed

        */

        static CVcxMyVideosDownloadUtil* NewL ( MVcxMyVideosDownloadUtilObserver& aObserver, RFs& aFs );

        /**

        * Destructor

        */

        virtual ~CVcxMyVideosDownloadUtil();

    public:

        /**

        * Starts download. New download ID is written to aDownload. If KVcxMediaMyVideosDownloadId

        * != 0, then the existing download is resumed.

        *

        * @param aDownload download parameters

        */

        void StartDownloadL( CMPXMedia& aDownload );

        /**

        * Pauses download.

        *

        * @param aDownloadId Download ID.

        * @return            System-wide error code.

        */

        TInt PauseDownload( TUint32 aDownloadId );

        /**

        * Returns download by download ID. Ownership is not moved.

        *

        * @param aDownloadId Download ID.

        * @return            Download, or NULL if not found.

        */

        RHttpDownload* Download( TUint32 aDownloadId );

        /**

        * Returns download which has aFileName as EDlAttrDestFilename.

        * Ownership is not moved.

        *

        * @param aFileName Filename.

        * @return          Download, or NULL if not found.

        */

        RHttpDownload* Download( const TDesC& aFileName );

        /**

        * Returns array to downloads.

        */

        const CDownloadArray& Downloads();

        /**

        * Deletes download from download manager using download id.

        *

        * @param aDeleteContent If ETrue, then content is deleted also.

        * @return               System-wide error code.

        */

        TInt CancelDownload( TInt32 aId, TBool aDeleteContent );

        /**

        * Gets MPX/MDS version of the download state.

        *

        * @param aDownload       Download whose state is fetched.

        * @param aDownloadState  On completion, the download state is written here.

        */        

        void GetDownloadState(

                RHttpDownload& aDownload,

                TVcxMyVideosDownloadState& aDownloadState );

        /**

        * Returns download state.

        *

        * @param aDownload   Download

        * @param aDownloaded How much the file has been downloaded in bytes.

        * @param aAllowSilentReset if ETrue, silent flag is set to EFalse, in

        *                          case dl size is not gotten ok.

        * @return            Download progress, in percentages.

        */        

        TInt8 DownloadProgress( RHttpDownload& aDownload, TUint64& aDownloaded,

                                TBool aAllowSilentReset );

        /**

        * Checks that every download item in Download Manager has corresponding

        * object in MPX/MDS (= aVideoList), if not, deletes the download.

        */

        void ClearOrphanDownloadsL( CMPXMedia& aVideoList );

        /**

        * Deletes download asynchronously.

        *

        * @param aDownloadId    Download to delete.

        * @param aDeleteContent If ETrue, then the content file is also deleted.

        */

        void DeleteDownloadAsync( TInt32 aDownloadId, TBool aDeleteContent );

        /**

        * Creates path and filename for the new video download.

        *

        * @return The path. 

        */

        HBufC* CreateFilePathL( const CMPXMedia& aMedia );

        /**

        * Notify via mediator, that one download has finished succesfully.

        *

        * @param aMsg Buffer that contains the data that is sent with event.

        */

        void NotifyDownloadCompleted( const TDesC8& aMsg );

        /**

        * Notify via mediator, that count of new videos has decreased.

        * 

        * @param aMsg Buffer that constains the data that is sent with event.  

        */

        void NotifyNewVideosCountDecreased( const TDesC8& aMsg );

    public: // From MHttpDownloadMgrObserver 

        /**

         * Handler function for download events.

         *

         * @param aDownload download

         * @aEvent aEvent event

         */

        void HandleDMgrEventL( RHttpDownload& aDownload, THttpDownloadEvent aEvent );

    public: // from MConnUtilEngineObserver

        /**

         * Roaming request from connectioutility.

         * Download utility decides whether it allows 

         * iap roaming and returns true or false based on decision.

         *

         * @return TBool

         */

        TBool RequestIsRoamingAllowedL();

        /**

         * Iap change notification from connectiontutility

         *

         */

        void  IapChangedL();              

    public: // from MVcxMyVideosTimer

        /**

        * Handle timer event.

        *

        * @param aTimer pointer to timer which expired.

        */

        void TimerExpired( CVcxMyVideosTimer* aTimer );

    private:

        /**

        * Constructor

        *

        * @param aObserver Observer

        * @param aFs       File server session.

        */

        CVcxMyVideosDownloadUtil( MVcxMyVideosDownloadUtilObserver& aObserver, RFs& aFs );

        /**

        * Symbian 2nd phase constructor.

        */

        void ConstructL ();

#ifdef _DEBUG

        const TDesC& GetS60DlStateDes( TInt32 aState );

        const TDesC& GetS60DlProgressDes( TInt32 aProgress );

#endif

        /**

        * Signal via mediator event that there is ongoing downloads.

        */

        void NotifyDownloadStarted();

        /**

        * Check, is there running downloads. If not, notify via mediator

        */

        void NotifyIfNoActiveDownloads();

        /**

        * Counts active downloads.

        * @return Active download count.

        */

        TInt32 ActiveDownloadCount();

        /**

        * Creates filepath.

        *

        * @param aMedia    Media item whose path is created

        * @param aPath     New path is written here.

        * @param aCounter  Counter value which is inserted to filename. 

        */

        void GeneratePathL( const CMPXMedia& aMedia, TDes& aPath, TInt aCounter );

        /**

        * Finds a sub dir which has less than KVcxMaxItemsInDir items, if not

        * found, creates one. The result is stored to iSubDir.

        *

        * @param aPath path

        */

        void FindSubDirL( const TDesC& aPath );

        /**

        * Calculates entries from the path.

        *

        * @param aPath Path.

        * @returm      Entrycount on the path.

        */

        TInt FileCountL( const TDesC& aPath );

        /**

        * Returns the drive section of the file path,

        * according to preferred cenrep setting. If drive

        * is locked or not present, the next available drive is

        * tried. If no available drives found, system drive is used.

        * Stores value to iPreferredMemoryDrivePath.

        *

        * @return   The drive section of the file path.

        */

        const TDesC& UsedMemoryDesL();

        /**

        * Stops iDownloadProgressTimer.

        */

        void StopProgressTimer();

        /**

        * Starts iDownloadProgressTimer.

        */

        void StartProgressTimer();

    private: //data

        /**

        * S60 Download manager client object.

        */

        RHttpDownloadMgr iDownloadManager;

        /**

        * Storage class for user name, used for 16->8 bit conversion.

        * This is member variable to reduce stack usage.

        */

        TBuf8<KMaxDefAttrLength> iUserName;

        /**

        * Storage class for password, used for 16->8 bit conversion.

        * This is member variable to reduce stack usage.

        */

        TBuf8<KMaxDefAttrLength> iPassword;

        /**

        * Storage class for url, used for 16->8 bit conversion.

        * This is member variable to reduce stack usage.

        */

        TBuf8<KMaxUrlLength> iUrl;

        /**

        * Observer of this class.

        */

        MVcxMyVideosDownloadUtilObserver& iObserver;

        /**

        * Used to delete download asynchronously, own.

        */

        CVcxMyVideosTimer* iDownloadDeleteTimer;

        /**

        * Used to update download progresses, own.

        */

        CVcxMyVideosTimer* iDownloadProgressTimer;

        /**

        * Downloads which are deleted asynchronously are stored here.

        */

        RArray<TInt32> iDownloadsToDelete;         

        /**

        * Delete content flags for async download delete are stored here.

        */

        RArray<TBool> iDeleteContent;

        /**

        * connectionutility

        */

        CVcxConnectionUtility* iConnUtil;

        /**

        * iMediatorEventProvider

        */

        CMediatorEventProvider* iMediatorEventProvider;

        /**

        * IAP currently set to Download Manager.

        * is used to avoid new set if IAP is the same already.

        */

        TUint32 iCurrentIap;

        /**

        * Used for storing the drive section of the path,

        * c:, e:, etc.

        */

        TBuf<2> iUsedMemoryDrivePath;

        /**

        * Drive used for downloading.

        */

        TInt iUsedDrive;

        /**

        * Fileserver session.

        */

        RFs& iFs;

        /**

        * SubDir is stored here.

        */

        TBuf<KVcxMaxSubDirsLength> iSubDir;

        /**

        * Flag that tells do we really have a roaming situation.

        */

        TBool iRoamingOngoing;

    };

#endif   // VCXMYVIDEOSDOWNLOADUTIL_H