/*

* Copyright (c) 2007-2008 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:   Implementation of the handover trigger

*

*/

#include <e32base.h>

#include <vccsubscribekeys.h>

#include "vccuipsproperty.h"

#include "vcchotrigger.h"

#include "vccsignallevelhandler.h"

#include "vccwlansignallevelhandler.h"

#include "vccgsmsignallevelhandler.h"

#include "rubydebug.h"

#include "vcchopolicyreader.h"

#include "vcccchmonitor.h"

#include "vccengpsproperty.h"

#include "cvccperformer.h"

// Min. signal strength.

static const TInt32 KStrengthMin = 110;

// ======== MEMBER FUNCTIONS ========

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

// Symbian constructor

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

//

EXPORT_C CVccHoTrigger* CVccHoTrigger::NewL()

    {

    RUBY_DEBUG_BLOCKL( "CVccHoTrigger::NewL" );

    CVccHoTrigger* self = new ( ELeave ) CVccHoTrigger();

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

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

// Destructor

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

//

CVccHoTrigger::~CVccHoTrigger()

    {

    RUBY_DEBUG0( "CVccHoTrigger::~CVccHoTrigger() - ENTER" );

    delete iProperty;

    delete iWlanSignalLevelHandler;

    delete iGsmSignalLevelHandler;

    delete iHoPolicyReader;

    delete iCchMonitor;

    delete iEngPsProperty;

    RUBY_DEBUG0( "CVccHoTrigger::~CVccHoTrigger() - EXIT" );

    }

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

// CVccHoTrigger::CVccHoTrigger()

// C++ default constructor can NOT contain any code, that might leave.

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

//

CVccHoTrigger::CVccHoTrigger() :         //: CActive( EPriorityStandard )

    iGsmClass( ESignalClassUndefined ),

    iWlanClass( ESignalClassUndefined ),

    iManualHoDone( EFalse ),

    iHoNotAllowed( EFalse ),

    iHoAllowedIfCsOriginated( ETrue )

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::CVccHoTrigger" );

    }

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

// 2nd phase constructor

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

//

void CVccHoTrigger::ConstructL()

    {

    RUBY_DEBUG_BLOCKL( "CVccHoTrigger::ConstructL" );

    iProperty = CVccUiPsProperty::NewL();

    iHoPolicyReader = CVccHoPolicyReader::NewL();

    iHoPolicyReader->ReadSettingsL();

    iEngPsProperty = CVccEngPsProperty::NewL();

    iPolicy = iHoPolicyReader->HoPolicy();

    TSignalLevelParams gsm = iHoPolicyReader->CsSignalLevelParams();

    TSignalLevelParams wlan = iHoPolicyReader->PsSignalLevelParams();

    iWlanSignalLevelHandler =

        CVccWlanSignalLevelHandler::NewL( *this, wlan, *iEngPsProperty );

    iGsmSignalLevelHandler =

        CVccGsmSignalLevelHandler::NewL( *this, gsm );

    iHoAllowedIfCsOriginated = iPolicy.DtAllowedWhenCsOriginated();

    // Previous signal level class must be undefined

    iPreviousGsmClass = ESignalClassUndefined;

    iPreviousWlanClass = ESignalClassUndefined;

    // In the beginning the VoIP service is not available.

    // This will be changed when the cch monitor calls us

    // when the service is available.

    iCchServiceStatus = EServiceUnavailable;

    // CS network has signal level zero if the service is not

    // available.

    iCsSignalLevel = KStrengthMin;

    // We are not stared yet.

    iStarted = EFalse;

    // Update P&S keys to tell if we can do ho or not.    

    UpdatePsKeysL();

    // Create the CCH monitor. We are the observer to be

    // notified when the status changes.

    iCchMonitor = CVccCchMonitor::NewL( *this );

    }

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

// Stop monitoring

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

//

EXPORT_C void CVccHoTrigger::Stop()

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::Stop" );

    Stop( *iWhoStartedMe );

    }

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

// Stop monitoring

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

//

EXPORT_C void CVccHoTrigger::Stop( CVccPerformer& aStopper )

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::Stop" );

    // If someone else that the one who started us tries

    // to stop us, we do not allow it.

    // There may be several performers that are in differnet state

    // and in those state they do not need trigger and thus try

    // to stop us.

    if ( iWhoStartedMe == &aStopper )

        {

        iWhoStartedMe = NULL;

        iStarted = EFalse;

        TRAP_IGNORE( UpdatePsKeysL() );

        TRAP_IGNORE( iProperty->NotifySubscriberL( EVccNoRequestOngoing ) );

        iWlanSignalLevelHandler->Stop();

        iGsmSignalLevelHandler->Stop();

        iGsmClass = ESignalClassUndefined;

        iWlanClass = ESignalClassUndefined;        

        // Reset CS signal strength to min

        iCsSignalLevel = KStrengthMin;

        // Disable (do not send notifications).

        // The service is not actually disabled.

        // It will be disabled (if needed) when the monitor

        // is deleted.

        iCchMonitor->DisableService();

        RUBY_DEBUG0( " -Trigger stopped");

        }

    }

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

// Start monitoring

// We must not leave.

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

//

EXPORT_C void CVccHoTrigger::Start( CVccPerformer& aWhoStartedMe, 

                                    TBool aCsOriginated )

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::Start" );

    if( iHoAllowedIfCsOriginated == EFalse && aCsOriginated )

        {

        RUBY_DEBUG0( "HO not allowed for CS originated calls" );

        Stop();

        return;

        }

    //anyone can start, but only the last one who started can stop the trigger

    iWhoStartedMe = &aWhoStartedMe;

    if( !iStarted )

        {

        // Previous signal level class must be undefined

        iPreviousGsmClass = ESignalClassUndefined;

        iPreviousWlanClass = ESignalClassUndefined;

        // read signal high/low levels, timers etc.

        TRAPD( err, iHoPolicyReader->ReadSettingsL() );

        RUBY_DEBUG1( "reading ho settings, err = %d", err );

        if ( !err )

        	{

		    TSignalLevelParams gsm = iHoPolicyReader->CsSignalLevelParams();

		    TSignalLevelParams wlan = iHoPolicyReader->PsSignalLevelParams();

		    iPolicy = iHoPolicyReader->HoPolicy();

		    iWlanSignalLevelHandler->SetParams( wlan );

		    iGsmSignalLevelHandler->SetParams( gsm );

		    TRAPD( err_wlan, iWlanSignalLevelHandler->StartL() );

		    RUBY_DEBUG1( "starting wlan signal level handler, err = %d", err_wlan );

		    TRAPD( err_gsm, iGsmSignalLevelHandler->StartL() );

		    RUBY_DEBUG1( "starting gsm signal level handler, err = %d", err_gsm );

		    if ( !err_wlan && !err_gsm )

		    	{		    

			    // Enable the VoIP service to be able to do VoIP calls.

			    TRAPD( err_cch, iCchMonitor->EnableServiceL() );

			    RUBY_DEBUG1( "enabling service, err = %d", err_cch );

			    if ( !err_cch )

			    	{

			    	// Everything was started ok

			    	iStarted = ETrue;

			    	}

		    	}

		    else

		    	{

		    	// Stop the handlers just in case either one was started

		    	iWlanSignalLevelHandler->Stop();

		    	iGsmSignalLevelHandler->Stop();

		    	}

        	}

        TRAP_IGNORE( UpdatePsKeysL() );

        }

    }

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

// Set the domain type of the current call

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

//

EXPORT_C void CVccHoTrigger::SetCurrentDomainType( TCallDomainType aDomainType )

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::SetCurrentDomainType" );

    iDomainType = aDomainType;

    }

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

// Set the preferred domain type

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

//

EXPORT_C void CVccHoTrigger::SetPreferredDomainType( 

                                        TVccHoPolicyPreferredDomain aDomainType )

    {

    RUBY_DEBUG1( "CVccHoTrigger::SetPreferredDomainType(%d)", aDomainType );

    iPolicy.SetPreferredDomain( aDomainType );

    }

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

// Set Immediate Domain Transfer on/off

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

//

EXPORT_C void CVccHoTrigger::SetImmediateDomainTransfer( TBool aImmediateDT )

    {

    RUBY_DEBUG1( "CVccHoTrigger::SetImmediateDomainTransfer(%d)", aImmediateDT );

    iPolicy.SetDoImmediateHo(  aImmediateDT );

    }

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

// Handles wlan signal change notifications

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

//

void CVccHoTrigger::WlanSignalChanged(

        TInt32 /*aSignalStrength*/,

        TSignalStrengthClass aClass )

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::WlanSignalChanged" );

    //Store signal strength class to that we know later what is the strength

    iWlanClass = aClass;

    RUBY_DEBUG1( " -iWlanClass=%x ", iWlanClass );

    RUBY_DEBUG1( " -iDomainType=%x ", iDomainType );

    RUBY_DEBUG1( " -iGsmClass=%x ", iGsmClass );

    RUBY_DEBUG1( " -DoImmediateHO=%x ", iPolicy.DoImmediateHo() );

    RUBY_DEBUG1( " -PreferredDomain=%x ", iPolicy.PreferredDomain() );

    RUBY_DEBUG1( " -iGsmClass=%x ", iGsmClass );

    RUBY_DEBUG1( " -DoHoInHeldWaitingCalls=%x ", iPolicy.DoHoInHeldWaitingCalls() );

    RUBY_DEBUG0( "0 = GOOD, 1 = WEAK, 2 = UNDEFINED" );

    // If the previous class is the same as the new one

    // - do nothing.

    if ( iPreviousWlanClass == iWlanClass )

        {

        if (iWlanClass == ESignalClassWeak)

            {

            RUBY_DEBUG0( "Signal is still weak try again to do HO" );

            }

        else

            {

            RUBY_DEBUG0( "No change in WLAN signal class -> return" );

            return;

            }

          }

    else

        {

        iPreviousWlanClass = iWlanClass;

        }

    TriggerHo();

     }

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

// Handles GSM singnal change notifications

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

//

void CVccHoTrigger::GsmSignalChanged(

        TInt32 aSignalStrength,

        TSignalStrengthClass aClass )

    {

    RUBY_DEBUG_BLOCK( "VccHoTrigger::GsmSignalChanged" );

    RUBY_DEBUG1( " -iCsSignalLevel=%d ", aSignalStrength );

    //Store signal strength class to that we know later what is the strength

    iGsmClass = aClass;

    // Save the signal strength as "status".

    // Zero (0) means that the service is not available.

    iCsSignalLevel = aSignalStrength;

    // Update P&S keys to tell if we can do ho or not.

    // If the signal level has gone to zero, we are unable to

    // do hondover.

    TVccHoStatus hoStatus( EVccHoStateUnknown );

    iEngPsProperty->GetCurrentHoStatus( hoStatus );

        {

        RUBY_DEBUG0( "HO not in progress,  updating keys" );

        TRAP_IGNORE( UpdatePsKeysL() );

        }

    RUBY_DEBUG1( " -iWlanClass=%x ", iWlanClass );

    RUBY_DEBUG1( " -iDomainType=%x ", iDomainType );

    RUBY_DEBUG1( " -iGsmClass=%x ", iGsmClass );

    RUBY_DEBUG1( " -DoImmediateHO=%x ", iPolicy.DoImmediateHo() );

    RUBY_DEBUG1( " -PreferredDomain=%x ", iPolicy.PreferredDomain() );

    RUBY_DEBUG1( " -DoHoInHeldWaitingCalls=%x ", iPolicy.DoHoInHeldWaitingCalls() );  

    RUBY_DEBUG0( "0 = GOOD, 1 = WEAK, 2 = UNDEFINED" );

    // If the previous class is the same as the new one

    // - do nothing.

    if ( iPreviousGsmClass == iGsmClass && iWlanClass != ESignalClassWeak  )

        {

        RUBY_DEBUG0( "No change in GSM signal class -> return" );

        return;

        }

    else

        {

        iPreviousGsmClass = iGsmClass;

        }

    TriggerHo();

    }

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

// Handles CCH monitor notifications

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

//

void CVccHoTrigger::CchServiceStatusChanged( TServiceStatus aStatus )

    {

    RUBY_DEBUG_BLOCK( "VccHoTrigger::CchServiceStateChanged" );

    RUBY_DEBUG1( " -Service status = %d", aStatus );

    // Save the status

    iCchServiceStatus = aStatus;

    TRAP_IGNORE( UpdatePsKeysL() );

    TriggerHo();

    }

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

// Check if the CS or PS services are available or not

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

//

TBool CVccHoTrigger::ServicesAvailable()

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::AreServicesAvailable" );

    TBool retVal( ETrue );

    // If PS service (VoIP service) is unavailable or

    // the CS service == 0 (i.e. signal level),

    // we cannot do handover.

    if ( iCchServiceStatus == EServiceUnavailable || 

                    iCsSignalLevel == KStrengthMin )

        {

        RUBY_DEBUG0( " -VoIP/CS service(s) not available" );

        retVal = EFalse;

        }

    return retVal;

    }

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

// Update (write) service status state to P&S.

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

//

void CVccHoTrigger::UpdatePsKeysL()

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::UpdatePsKeysL" );

    // If we are started and both services are available,

    // handover can be done.

    // Services available in CS means that we have

    // signal strength != KStrengthMin (which is 110, returned

    // from the CS signal level monitor).

    RUBY_DEBUG1( " -iStarted = %d", iStarted );

    RUBY_DEBUG1( " -iHoNotAllowed = %d", iHoNotAllowed );

    RUBY_DEBUG1( " -Service status = %d (0=unavailable, 1=available)", iCchServiceStatus );

    RUBY_DEBUG1( " -CS signal min level = 110, current level = %d", iCsSignalLevel );

    if ( iStarted &&

            ( iCchServiceStatus == EServiceAvailable ) && 

            ( iCsSignalLevel != KStrengthMin ) &&

            ( !iHoNotAllowed ) )

        {

        RUBY_DEBUG0( " -We are started and both services are available" );

        // Check HO direction restrictions

        if ( ( iPolicy.AllowedDirection() & ECsToPsAllowed ) && 

                ( iPolicy.AllowedDirection() & EPsToCsAllowed ) )

            {

            if( iPolicy.DoHoInHeldWaitingCalls() )

                {

                RUBY_DEBUG0( " -Services available and ho allowed to both \

                             directions, also in multicall" );

                iEngPsProperty->NotifySubscriberL( EVccHoStateIdle, KErrNone );

                }

            else

                {

                RUBY_DEBUG0( " -Services available and ho allowed to both \

                             directions but not in multicall" );

                iEngPsProperty->NotifySubscriberL( EVccHoStateIdleIfSingleCall, KErrNone );

                }

            }

        else if ( !( iPolicy.AllowedDirection() & ECsToPsAllowed  ) &&

                ( iPolicy.AllowedDirection() & EPsToCsAllowed ) )

            {

            if( iPolicy.DoHoInHeldWaitingCalls() )

                {

                RUBY_DEBUG0( " -HO allowed only to CS" );

                iEngPsProperty->NotifySubscriberL( EVccCsToPsNotAllowed, KErrNone );

                }

            else

                {

                RUBY_DEBUG0( " -HO allowed only to CS, in single call situation" );

                iEngPsProperty->NotifySubscriberL( EVccHoAllowedToCsIfSingleCall, KErrNone );

                }

            }

        else if ( !( iPolicy.AllowedDirection() & EPsToCsAllowed ) &&  

                    ( iPolicy.AllowedDirection() & ECsToPsAllowed ) )

            {

            if( iPolicy.DoHoInHeldWaitingCalls() )

                {

                RUBY_DEBUG0( " -HO allowed only to PS" );

                iEngPsProperty->NotifySubscriberL( EVccPsToCsNotAllowed, KErrNone );

                }

            else

                {

                RUBY_DEBUG0( " -HO allowed only to PS, in single call situation" );

                iEngPsProperty->NotifySubscriberL( EVccHoAllowedToPsIfSingleCall, KErrNone );

                }

            }

        }

    else

        {

        RUBY_DEBUG0( " -We are stopped or services are unavailable:" );

        iEngPsProperty->NotifySubscriberL( EVccHoUnavailable, KErrNotReady );        

        }

    }

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

// If manual HO is done, no automatic should be made.

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

//

EXPORT_C void CVccHoTrigger::ManualHoCallStarted()

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::ManualHoCallStarted" );

    iManualHoDone = ETrue;

    //notify Wlan Signal Level Handler so it can stop polling WLAN signal

    iWlanSignalLevelHandler->SetManualHoDone( ETrue );

    }

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

// After manual HO call has been released automatic HOs can be made again.

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

//

EXPORT_C void CVccHoTrigger::ManualHoCallReleased()

    {

    RUBY_DEBUG_BLOCK( "CVccHoTrigger::ManualHoCallReleased" );

    iManualHoDone = EFalse;

    iWlanSignalLevelHandler->SetManualHoDone( EFalse );

    }

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