/*

* 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 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:    Http download handler for epg plugin*

*/

#ifndef __CLIVETVDOWNLOAD_H

#define __CLIVETVDOWNLOAD_H

// User includes

#include <e32std.h>

#include "MIptvDownloadObserver.h"

#include "MIptvLiveUITimerObserver.h"

// FORWARD DECLARATIONS

class MIptvDownloadObserver;

class CIptvEpgService;

class CIptvLiveUIObjectTimer;

/**

*	Class to provide download functionality for i.e. epg plugins to download

*	content files over http. Download observer is used to report progress of

*	of the downloads to the user of this class.

*/

class CIptvDownload : public CBase,

					  public MHttpDownloadMgrObserver,

					  public MIptvLiveUITimerObserver

	{

	public:

	/**

	*	Symbian two phase constructor

	*	@param	None

	*	@return	Pointer to newly created CLiveTvHttpDownload object

	*/

	IMPORT_C static CIptvDownload* NewL( MIptvDownloadObserver* aObserver );

	/**

	*	Destructor

	*/

	~CIptvDownload();

	public: // Implemented methods from inherited M-classes

        /**

         *	From MHttpDownloadMgrObserver. Observer function to receive

         *	notification events about sessions and sub-sessions of Download

         *	Manager.

         *	@param	aDownload	Download resource handle which event occured in

         *	@param	aEvent		Occured download event. Contains following

    	 *						two values:

         *						THttpDownloadState

         *						THttpProgressState

         *	@return	None

         */

        void HandleDMgrEventL(RHttpDownload& aDownload, THttpDownloadEvent aEvent);

        /**

        * From MIptvLiveUITimerObserver. Timer fired successfully.

        */

        void TimerFires();

        /**

        * From MIptvLiveUITimerObserver. Error occured in the timer.

        * @param aError KErrNone if timer fired ok, KErrCancel, the timer was

    	* cancelled; KErrAbort, the timer was aborted because the system time

    	* changed; KErrUnderflow, the requested completion time is in the past;

    	* KErrOverFlow, the requested completion time is too far in the future.

        */

        void TimerError( const TInt aError );

	public: // new public methods

    	/**

    	*	Setter for service data to be used to retrieve username and password

    	*	to establish the download.

    	*	@param	aService	Object containing data for download object to

    	*						initialize download. This method needs to be

    	*						called before callind DownloadL.

    	*	@return	None

    	*/

    	IMPORT_C void SetService( CIptvEpgService* aService );

    	/**

    	*	Function to be used to start http download.

    	*	@param	aUid			Appuid of the application which is connecting in

    	*							download manager. This valua can be retrieved from

    	*							CIptvEpgService object

    	*	@param	aUri			Uri where download is done from

    	*	@param	aIapId			Internet accesspoint's id to be  used

    	*	@param	aFileName		Name of the file where retrieved data is put (this

    	*							also requires the path)

    	*	@param	aETag			Descriptor containing the previous ETag value. This

    	*							value is used to check if there has been an update

    	*							for the data on the server side when we receive content

    	*							type and ETag value in response header.

    	*	@param	aModifiedSince	String representing the modified since value of last

    	*							download. This value is used to compare with last modified

    	*							value from http header after receiving content type.

    	*	@return	None

    	*/

    	IMPORT_C void DownloadL( TUid aUid,

    							 const TDesC8& aUri,

    							 TUint32 aIapId,

    							 const TDesC& aFileName,

    							 const TDesC& aETag = KNullDesC(),

    							 const TDesC& aModifiedSince = KNullDesC() );

	private: // new private methods

    	/**

    	*	Default constructor

    	*/

    	CIptvDownload( MIptvDownloadObserver* aObserver );

    	/**

    	*	Symbian second phase constructor

    	*	@param	None

    	*	@return	None

    	*/

    	void ConstructL();

    	/**

    	*	Method to map download error to one of the enumerations defined

    	*	in TIptvDlError.

    	*	@param	aDownload	Object containing data for the download object

    	*						that faced an error situation

    	*	@param	aError		On return contains mapped error enumeration

    	*						and if no match found, EIptvDlGeneral is returned

    	*/

    	void ResolveDownloadErrorCode( RHttpDownload& aDownload,

    								   TIptvDlError& aError ) const;

    	/**

    	*	Initializes the download meaning takes connection to download

    	*	manager and sets used IAP from iService. This method is called

    	*	from SetService.

    	*	@param	None

    	*	@return	None

    	*/

    	void InitializeDownloadL();

        /**

        *  Delete current download asynchronously.

        */

        void DeleteDownloadAsyncL();

        /**

        * Create download.

        */

        void CreateDownloadL( const TDesC8& aUri, TBool aNoContentTypeCheck );

        /**

        * Leaving handler for TimerError().

        * 

        * @param aError KErrNone if timer fired ok, KErrCancel, the timer was

        * cancelled; KErrAbort, the timer was aborted because the system time

        * changed; KErrUnderflow, the requested completion time is in the past;

        * KErrOverFlow, the requested completion time is too far in the future. 

        */

        void HandleTimerErrorL( const TInt aError );

	private: // instance variables

    	/**

    	*	Handle to download manager to be used to retrieve data over http

    	*/

        RHttpDownloadMgr iDownloadManager;

        /**

        *	Pointer to download observer interface. This interface is used to

        *	signalize the caller about the progress of the download.

        */

        MIptvDownloadObserver* iObserver;

        /**

        *	Service containing specified data for the current download.

        */

        CIptvEpgService* iService;

    	/**

    	* ETrue if download manager is connected, EFalse otherwise.

    	*/

    	TBool iConnected;

    	TBuf<100> iDownloadETag;

    	TBuf<100> iDownloadLastModified;

    	/**

    	* Url for the download.

    	*/

    	TBuf8<KIptvUrlMaxLength> iUrl;

        /**

        * File name for the download.

        */

    	TBuf<KIptvUrlMaxLength> iFileName;

    	/**

    	* Timer for asynchronous operations like deleting the download.

    	*/

    	CIptvLiveUIObjectTimer* iTimer;

    	/**

    	* Flag to identify if async download deletion is ongoing.

    	*/

    	TBool iDeleteDownloadTimerRunning;

    	/**

        * Identifies download.

        */

        TInt32 iDownloadId;

        /**

        * Error to be sent to observer.

        */

        TInt iDlError;

        /**

        * After getting last-modified info we restart the download.

        */

        TBool iRestartDownloadAfterDeletion;

	};

#endif // __CLIVETVDOWNLOAD_H