/*

* Copyright (c) 2009 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 CMODEMATHANDLER_H

#define CMODEMATHANDLER_H

#include <e32base.h>

#include "mmodematobserver.h"

const TInt KMaxDteIdCount(10);

const TInt KPluginCount(2); //atext & common plugin

const TInt KMaxNumOfTransactionIds(256);

// FORWARD DECLARATIONS

class CModemAtSrv;

class RIscApi;

class TIsiReceiveC;

class MMtiWrapperService;

class CModemAtPipeController;

// CLASS DECLARATION

/**

*  CModemAtHandler

*  CModemAtHandler receives AT-commands from CModemATSession andsends AT-command to the AT-modem. 

*  CModemAtHandler communicates with AT modem by ISI-messages. Also pipemessages and name-service messages

*   are sent/received by CModemAtHandler. Pipe- and nameservice messages are forwarded to the CModemAtPipeController. 

*/

class CModemAtHandler : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aServer

     * @return Instance of self

     */

    static CModemAtHandler* NewL( CModemAtSrv& aServer );

    /**

     * Destructor.

     */

    ~CModemAtHandler();

    /**

     * Sends AT-command to Modem AT-server

     * @param aDteId 

     * @param aPluginType AText/Common

     * @param aMessageType 0=normal, 1=getnvram status

     * @param aCmd AT-command

     */

    TInt SendATCommand(

        const TUint8 aDteId,

        const TATPluginInterface aPluginType,

        const TUint8 aMessageType,

        const TDesC8& aCmd );

    /**

      *  Connects Handler to modem with specific dteid.

      *  @param TUint8 aDteId

      *  @return KErrNone or

	  *  @return KErrNoMemory

      */

    TInt Connect( const TUint8 aDteId );

    /**

     *  Disconnects handler from modem

     *  @param TUint8 aDteId

     *  @return Disconnect status

     */

    TInt Disconnect( const  TUint8 aDteId );

    TBool IsDisconnected();

    void HandleCommandModeChange( TInt aDteid, TCommandMode aMode );

    void SendAtModemDataRedirectResultReq( const TUint8 aDteId, const TUint aResult);

    TInt SendEscapeSignalDetection( const TUint8 aDteId );

    void HandleSignalDetectedResp( const TIsiReceiveC& aMessage );

    void RemovePipe( const TUint8 aDteId );

    TBool IsPluginConnected();

protected:

    // from CActive

    void RunL();

    void DoCancel();

private:

    /**

     * Default C++ constructor.

     */

    CModemAtHandler( CModemAtSrv& aServer );

    /**

     *  2nd phase constructor

     */

    void ConstructL();

    void OpenChannelL();

    void HandleATResponse(const TIsiReceiveC& aMessage);

#ifdef __WINSCW__

    void HandleATResponse( );

#endif

    void HandleModemConnectResp( const TIsiReceiveC& aMessage);

    void HandleSignalInd(const TIsiReceiveC& aMessage);

    void HandleUnsolicitedData(const TIsiReceiveC& aMessage);

    TInt GetMinSizeDividendByFour( TInt aSize);

    void HandleIntermediateDataInd(const TIsiReceiveC& aMessage);

    void HandleRedirectInd(const TIsiReceiveC& aMessage);

    void HandleRedirectResultResp(const TIsiReceiveC& aMessage);

    void SetDisconnected( TBool aIsDisconnected );

private:

    //data

    CModemAtSrv& iServer;

    RIscApi* iIscApi;

    HBufC8* iReceivedMessageBuffer;

    TUint16 iMessageBufferSize;

    TPtr8 iReceivePtr;

    TUint16 iReceiveMessageLength;

    TIsiReceiveC*  iReceivedMessage;

    TUint iPepObjId;    //controller pep

    CModemAtPipeController* iPipeController;

#ifdef __WINSCW__

    TInt iEmulatedValue;

    TUint8 iDteId;

    TUint8 iChannel;

    TATPluginInterface iPluginType;

#endif

    TUint8 iLastTransactionId[KMaxNumOfTransactionIds];

    TBool iDisconnected;

    };

#endif  // CMODEMATHANDLER_H