/*

* Copyright (c) 2009-2010 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:  Definitions needed for one "stream" of CDunTransporter

*

*/

/*

 * TODO: When local media is of type RComm, listening on it is started with

 * RComm::NotifyDataAvailable() call. Check that USB ACM port and Irda RCOMM

 * (and any other new media in the future) behaves correctly so that when

 * RComm::ReadOneOrMore() is issued, the read is issued immediately without

 * checking for new data. If waiting for new data happens in this

 * NotifyDataAvailable/ReadOneOrMore combination, raise a defect to Symbian.

 */

#include "DunTransporter.h"

#include "DunDownstream.h"

#include "DunUpstream.h"

#include "DunDebug.h"

// ---------------------------------------------------------------------------

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

CDunDownstream* CDunDownstream::NewL( MDunTransporterUtilityAux* aUtility )

    {

    CDunDownstream* self = new (ELeave) CDunDownstream( aUtility );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// ---------------------------------------------------------------------------

// Destructor.

// ---------------------------------------------------------------------------

//

CDunDownstream::~CDunDownstream()

    {

    FTRACE(FPrint( _L("CDunDownstream::~CDunDownstream()" )));

    ResetData();

    FTRACE(FPrint( _L("CDunDownstream::~CDunDownstream() complete" )));

    }

// ---------------------------------------------------------------------------

// Resets data to initial values

// ---------------------------------------------------------------------------

//

void CDunDownstream::ResetData()

    {

    // APIs affecting this:

    // IssueRequest()

    Stop();

    // InitializeForDataPushing()

    delete iPushData.iDataPusher;

    iPushData.iDataPusher = NULL;

    // AddConnMonCallbackL()

    iCallbacksR.Close();

    iCallbacksW.Close();

    // AddSkippedErrorL()

    iOkErrorsR.Close();

    iOkErrorsW.Close();

    // Internal

    Initialize();

    }

// ---------------------------------------------------------------------------

// Initializes this stream for AT command notifications

// ---------------------------------------------------------------------------

//

TInt CDunDownstream::InitializeForDataPushing(

    MDunAtCmdHandler* aAtCmdHandler )

    {

    FTRACE(FPrint( _L("CDunDownstream::InitializeForDataPushing()" ) ));

    if ( iPushData.iDataPusher || iPushData.iAtCmdHandler )  // optional

        {

        FTRACE(FPrint( _L("CDunDownstream::InitializeForDataPushing() (already exists) complete" ) ));

        return KErrAlreadyExists;

        }

    if ( !aAtCmdHandler )

        {

        FTRACE(FPrint( _L("CDunDownstream::InitializeForDataPushing() (aAtCmdHandler) not initialized!" ) ));

        return KErrGeneral;

        }

    CDunDataPusher* dataPusher = NULL;

    TRAPD( retTrap, dataPusher = CDunDataPusher::NewL(*this,this) );

    if ( retTrap != KErrNone )

        {

        FTRACE(FPrint( _L("CDunDownstream::InitializeForDataPushing() (trapped!) complete" ) ));

        return retTrap;

        }

    if ( iComm )

        {

        dataPusher->SetMedia( iComm );

        }

    else if ( iSocket )

        {

        dataPusher->SetMedia( iSocket );

        }

    iPushData.iDataPusher = dataPusher;

    iPushData.iAtCmdHandler = aAtCmdHandler;

    FTRACE(FPrint( _L("CDunDownstream::InitializeForDataPushing() complete" ) ));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// Adds data to event queue and starts sending if needed

// ---------------------------------------------------------------------------

//

TInt CDunDownstream::AddToQueueAndSend( const TDesC8 *aPushedData,

                                        MDunCompletionReporter* aCallback )

    {

    FTRACE(FPrint( _L("CDunDownstream::AddToQueueAndSend()" ) ));

    if ( !iPushData.iDataPusher )

        {

        FTRACE(FPrint( _L("CDunDownstream::AddToQueueAndSend() (iPushData.iDataPusher not initialized!) complete" )));

        return KErrGeneral;

        }

    // Add to event queue. If something went wrong, just return

    TInt retTemp = iPushData.iDataPusher->AddToEventQueue( aPushedData, aCallback );

    if ( retTemp != KErrNone )

        {

        FTRACE(FPrint( _L("CDunDownstream::AddToQueueAndSend() (ERROR) complete" )));

        return retTemp;

        }

    // Now push the data. If already active, push will start later, if not

    // active it will start immediately.

    iPushData.iDataPusher->SendQueuedData();

    FTRACE(FPrint( _L("CDunDownstream::AddToQueueAndSend() complete" ) ));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// Starts downstream by issuing read request

// ---------------------------------------------------------------------------

//

TInt CDunDownstream::StartStream()

    {

    FTRACE(FPrint( _L("CDunDownstream::StartStream()" ) ));

    // Note: only start URC here.

    // The downstream read request is started when command mode ends.

    // This is done to make the data arrive in the correct order (reply vs.

    // data) with "ATD" command.

    TInt retVal = KErrNone;

    if ( iPushData.iAtCmdHandler )

        {

        retVal = iPushData.iAtCmdHandler->StartUrc();

        }

    FTRACE(FPrint( _L("CDunDownstream::StartStream() complete" ) ));

    return retVal;

    }

// ---------------------------------------------------------------------------

// Stops transfer for read or write endpoints

// ---------------------------------------------------------------------------

//

TInt CDunDownstream::Stop( TBool aStopMplex )

    {

    FTRACE(FPrint( _L("CDunDownstream::Stop() (Dir=%d)" ), iDirection));

    if ( !iPushData.iDataPusher )

        {

        FTRACE(FPrint( _L("CDunDownstream::Stop() (iPushData.iDatapusher not initialized!) complete" )));

        return KErrGeneral;

        }

    // Stop the downstream related AT command handling functionality

    if ( aStopMplex )  // optional

        {

        if ( iPushData.iAtCmdHandler )

            {

            iPushData.iAtCmdHandler->StopAtCmdHandling();

            }

        // Stop the multiplexer separately

        iPushData.iDataPusher->Stop();

        }

    if ( iTransferState != EDunStateTransferring )

        {

        FTRACE(FPrint( _L("CDunDownstream::Stop() (not ready) complete" )));

        return KErrNotReady;

        }

    // Stop only current operation

    if ( iOperationType == EDunOperationTypeRead )

        {

        if ( iNetwork )

            {

            iNetwork->ReadCancel();

            Cancel();

            FTRACE(FPrint( _L("CDunDownstream::Stop() (Network) cancelled" )));

            }

        }

    else if ( iOperationType == EDunOperationTypeWrite )

        {

        iPushData.iDataPusher->StopOneEvent( iBufferPtr );

        }

    iTransferState = EDunStateIdle;

    FTRACE(FPrint( _L("CDunDownstream::Stop() complete" )));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// CDunDownstream::CDunDownstream

// ---------------------------------------------------------------------------

//

CDunDownstream::CDunDownstream( MDunTransporterUtilityAux* aUtility ) :

    iUtility( aUtility )

    {

    Initialize();

    }

// ---------------------------------------------------------------------------

// CDunDownstream::ConstructL

// ---------------------------------------------------------------------------

//

void CDunDownstream::ConstructL()

    {

    FTRACE(FPrint( _L("CDunDownstream::ConstructL()" ) ));

    if ( !iUtility )

        {

        User::Leave( KErrGeneral );

        }

    FTRACE(FPrint( _L("CDunDownstream::ConstructL() complete" ) ));

    }

// ---------------------------------------------------------------------------

// Initializes this class

// ---------------------------------------------------------------------------

//

void CDunDownstream::Initialize()

    {

    // Don't initialize iUtility here (it is set through NewL)

    iPushData.iDataMode = EFalse;

    iPushData.iDataPusher = NULL;

    iPushData.iAtCmdHandler = NULL;

    }

// ---------------------------------------------------------------------------

// Issues transfer request for this stream

// ---------------------------------------------------------------------------

//

TInt CDunDownstream::IssueRequest()

    {

    // Set direction

    iDirection = static_cast<TDunDirection>( EDunStreamTypeDownstream | iOperationType );

    FTRACE(FPrint( _L("CDunDownstream::IssueRequest() (Dir=%d)" ), iDirection));

    if ( !iPushData.iDataPusher )

        {

        FTRACE(FPrint( _L("CDunDownstream::IssueRequest() (iPushData.iDataPusher not initialized!) complete" ) ));

        return KErrGeneral;

        }

    if ( iTransferState != EDunStateIdle )

        {

        FTRACE(FPrint( _L("CDunDownstream::IssueRequest() (not ready) complete" ) ));

        return KErrNotReady;

        }

    if ( iOperationType == EDunOperationTypeRead )

        {

        iBufferPtr->SetLength( iBufferPtr->MaxLength() );

        FTRACE(FPrint( _L("CDunDownstream::IssueRequest() trying to read %d bytes... (Dir=%d)" ), iBufferPtr->Length(), iDirection));

        }

    else // iOperationType == EDunOperationTypeWrite

        {

        FTRACE(FPrint( _L("CDunDownstream::IssueRequest() writing %d bytes... (Dir=%d)" ), iBufferPtr->Length(), iDirection));

        }

    switch ( iDirection )

        {

        case EDunReaderDownstream:

            iStatus = KRequestPending;

            iNetwork->ReadOneOrMore( iStatus, *iBufferPtr );

            SetActive();

            FTRACE(FPrint( _L("CDunDownstream::IssueRequest() RComm ReadOneOrMore() requested" ) ));

            break;

        case EDunWriterDownstream:

            AddToQueueAndSend( iBufferPtr, this );

            break;

        default:

            FTRACE(FPrint( _L("CDunDownstream::IssueRequest() (ERROR) complete" ) ));

            return KErrGeneral;

        }

    iTransferState = EDunStateTransferring;

    FTRACE(FPrint( _L("CDunDownstream::IssueRequest() (Dir=%d) complete" ), iDirection));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// From class CActive.

// Gets called when endpoint data read complete

// ---------------------------------------------------------------------------

//

void CDunDownstream::RunL()

    {

    FTRACE(FPrint( _L("CDunDownstream::RunL() (Dir=%d)" ), iDirection));

    iTransferState = EDunStateIdle;

    if ( iOperationType != EDunOperationTypeRead )

        {

        FTRACE(FPrint( _L("CDunDownstream::RunL() (wrong operation type!) complete" )));

        return;

        }

    TBool isError;

    TInt retTemp = iStatus.Int();

    TInt stop = ProcessErrorCondition( retTemp, isError );

    if ( !stop )  // no real error detected -> continue

        {

        if ( !isError )

            {

            // Operation type was read so now set to write

            iOperationType = EDunOperationTypeWrite;

            }  // if ( !isError )

        IssueRequest();

        }  // if ( !stop )

    else  // stop -> tear down connection

        {

        // Now CDunDataPusher notifies to write case so here we just notify the

        // read case.

        TDunConnectionReason connReason;

        connReason.iReasonType = EDunReasonTypeRW;

        connReason.iContext = GetMediaContext( EDunStreamTypeDownstream );

        connReason.iSignalType = 0;

        connReason.iSignalHigh = EFalse;

        connReason.iDirection = iDirection;

        connReason.iErrorCode = retTemp;

        iUtility->DoNotifyConnectionNotOk( iComm,

                                           iSocket,

                                           connReason,

                                           iCallbacksR );

        FTRACE(FPrint( _L("CDunDownstream::RunL() stop" )));

        }  // else

    FTRACE(FPrint( _L("CDunDownstream::RunL() complete" )));

    }

// ---------------------------------------------------------------------------

// From class CActive.

// Gets called on cancel

// ---------------------------------------------------------------------------

//

void CDunDownstream::DoCancel()

    {

    }

// ---------------------------------------------------------------------------

// From class MDunStreamManipulator.

// Gets called when outside party wants to push data to the existing stream

// ---------------------------------------------------------------------------

//

TInt CDunDownstream::NotifyDataPushRequest( const TDesC8 *aPushedData,

                                            MDunCompletionReporter* aCallback )

    {

    FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushRequest()" )));

    // If in data mode push the reply anyway as "CONNECT" or "NO CARRIER"

    // reply could arrive before/after the command mode information itself.

    TInt retVal = AddToQueueAndSend( aPushedData, aCallback );

    FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushRequest() complete" )));

    return retVal;

    }

// ---------------------------------------------------------------------------

// From class MDunCompletionReporter.

// Gets called when data push is complete

// ---------------------------------------------------------------------------

//

void CDunDownstream::NotifyDataPushComplete( TBool aAllPushed )

    {

    FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushComplete()" )));

    // Next just skip the notifications of atomic operations because also this

    // class initiates the pushing of atomic data.

    if ( !aAllPushed )

        {

        FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushComplete() (continue) complete" )));

        return;

        }

    iTransferState = EDunStateIdle;

    iOperationType = EDunOperationTypeUndefined;

    if ( !iPushData.iDataPusher )

        {

        FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushComplete() (iPushData.iDataPusher not initialized!) complete" )));

        return;

        }

    // Now the multiplexer might have pushed the contained data in this class

    // or it might have pushed only the external data. If the pushed data

    // contains this classes data then reissue request, otherwise just clear

    // the queue.

    TInt foundIndex = iPushData.iDataPusher->FindEventFromQueue( iBufferPtr );

    iPushData.iDataPusher->SignalCompletionAndClearQueue();

    FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushComplete() (find event)" )));

    if ( foundIndex >= 0 )

        {

        // Restart the reading from Dataport only if in data mode

        FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushComplete() (issue request)" )));

        if ( iPushData.iDataMode )

            {

            iOperationType = EDunOperationTypeRead;

            IssueRequest();

            }

        }

    FTRACE(FPrint( _L("CDunDownstream::NotifyDataPushComplete() complete" )));

    }

// ---------------------------------------------------------------------------

// From class MDunCmdModeMonitor.

// Notifies about command mode start

// ---------------------------------------------------------------------------

//

void CDunDownstream::NotifyCommandModeStart()

    {

    FTRACE(FPrint( _L("CDunDownstream::NotifyCommandModeStart()" )));

    iPushData.iDataMode = EFalse;

    // Now the data mode has ended.

    // If read operation then cancel it.

    if ( iOperationType == EDunOperationTypeRead )

        {

        Stop( EFalse );

        }

    FTRACE(FPrint( _L("CDunDownstream::NotifyCommandModeStart() complete" )));

    }

// ---------------------------------------------------------------------------

// From class MDunCmdModeMonitor.

// Notifies about command mode end

// ---------------------------------------------------------------------------

//

void CDunDownstream::NotifyCommandModeEnd()

    {

    FTRACE(FPrint( _L("CDunDownstream::NotifyCommandModeEnd()" )));

    iPushData.iDataMode = ETrue;

    // Command mode ends here so start reading from Dataport

    iOperationType = EDunOperationTypeRead;

    IssueRequest();

    FTRACE(FPrint( _L("CDunDownstream::NotifyCommandModeEnd() complete" )));

    }