/*

* Copyright (c) 2004-2005 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:  Provides DOS emergency number policy API implementation.

*

*/

// INCLUDE FILES

#include "cdosemergencynumberpolicy.h" 

#include <mmtsy_names.h>

#include <telservicesvariant.hrh>

#include <centralrepository.h>

#include <telservicesinternalcrkeys.h>

#include <defaultemergencynumberscrkeys.h>

// CONSTANT

const TInt KDosEmergencyNumberMaxLength = 6;

//Prefix for Sip.

_LIT( KSipPrefix, "sip:" );

//Prefix for Tel.

_LIT( KTelPrefix, "tel:" );

//Prefix for Sos.

_LIT( KSosPrefix, "sos:" );

// @ char

_LIT( KAt, "@" );

// Prefix length

const TInt KPrefixLength = 4;

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

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

// CDosEmergencyNumberPolicy::~CDosEmergencyNumberPolicy()

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

//

CDosEmergencyNumberPolicy::~CDosEmergencyNumberPolicy()

    {

    if ( iListener )

        {

        iListener->StopListening();

        delete iListener;

        }

    delete iCenRep;

    iProductSpecificList.Zero();

    iCustomPhone.Close();

    iMobilePhone.Close();

    }

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

// CDosEmergencyNumberPolicy::ConstructL()

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

//

void CDosEmergencyNumberPolicy::ConstructL( RTelServer& aETelServer )

    {

    iETelServer = aETelServer;

    User::LeaveIfError( iMobilePhone.Open( iETelServer , KMmTsyPhoneName ) );

    User::LeaveIfError( iCustomPhone.Open( iMobilePhone) );

    TInt variantReadOnlyValues = 0;

    TInt err = KErrNone;

    CRepository* variationFlags = CRepository::NewL( KCRUidTelSrvVariation );

    err = variationFlags->Get( KTelSrvVariationFlags , variantReadOnlyValues );

    if ( err != KErrNotFound )

        {

        User::LeaveIfError( err );

        }  

    if ( KTelSrvLVFlagAdvancedENCheck & variantReadOnlyValues )

        {

        iAdvancedCheck = ETrue;

        }

    else

        {

        iAdvancedCheck = EFalse;

        }

    iCenRep = CRepository::NewL( KCRUidDefaultEmergencyNumbers );    

    iListener = CCenRepNotifyHandler::NewL( 

        *this, 

        *iCenRep, 

        CCenRepNotifyHandler::EStringKey, 

        KDefaultEmergencyNumbersList );

    iListener->StartListeningL();

    ReadProductSpecificNumbers();

    }

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

// CDosEmergencyNumberPolicy::IsEmergencyNumberL 

// 

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

//

TInt CDosEmergencyNumberPolicy::IsEmergencyNumber ( 

                                    TPhCltTelephoneNumber& aTelNumber, 

                                    TPhCltEmergencyNumberQueryMode aMode,

                                    TBool& aIsEmergencyNumber )

    {   

    TPhCltTelephoneNumber checkedTelNumber(aTelNumber);

    ParseNumber( checkedTelNumber );

    aIsEmergencyNumber = EFalse;

    RMmCustomAPI::TEmerNumberCheckMode  checkedNumberMode;

    if ( checkedNumberMode.iNumber.MaxLength() >= checkedTelNumber.Length() ) // aTelNumber -> checkedTelNumber

        {

        checkedNumberMode.iNumber = checkedTelNumber; // aTelNumber -> checkedTelNumber

        }

    else

        {

        // too long, cannot be checked

        return KErrArgument;

        }

    // set check type

    switch ( aMode )

        {

        case EPhCltEmergencyNumberQueryModeAdvanced:

            {

            // check if it is a product specific number.

            if ( IsInListByAdvancedMode( checkedTelNumber ) ) // aTelNumber -> checkedTelNumber

                {

                aTelNumber = checkedTelNumber; // aTelNumber -> checkedTelNumber

                aIsEmergencyNumber = ETrue;

                return KErrNone;

                }

            // if TSY doesn't support advanced mode, then check by S60 advanced mode

            // based on TSY normal mode check.

            if ( ! iAdvancedCheck )

                {

                TInt length = 

                    Min( checkedTelNumber.Length(), KDosEmergencyNumberMaxLength ); // aTelNumber -> checkedTelNumber

                checkedNumberMode.iCheckMode = RMmCustomAPI::EEmerNumberCheckNormal;

                TInt result = KErrArgument;

                while ( ( length > 0 ) && ! aIsEmergencyNumber )

                    {

                    checkedNumberMode.iNumber = checkedTelNumber.Right( length ); // aTelNumber -> checkedTelNumber

                    result = iCustomPhone.CheckEmergencyNumber( 

                            checkedNumberMode, aIsEmergencyNumber );

                    if ( result == KErrNone && aIsEmergencyNumber )

                        {

                        aTelNumber = checkedNumberMode.iNumber;

                        }

                    length--;

                    }

                return result;

                }

            else

                {

                checkedNumberMode.iCheckMode = 

                    RMmCustomAPI::EEmerNumberCheckAdvanced;

                }

            }

            break;

        case EPhCltEmergencyNumberQueryModeNormal:

        case EPhCltEmergencyNumberQueryModeNormalWriteback:

            // check if it is a product specific number.

            if ( IsInListByNormalMode( checkedTelNumber ) ) // aTelNumber -> checkedTelNumber

                {

                aTelNumber = checkedTelNumber; // aTelNumber -> checkedTelNumber

                aIsEmergencyNumber = ETrue;

                return KErrNone;

                }

            // flow thru

        default:

            checkedNumberMode.iCheckMode = 

                RMmCustomAPI::EEmerNumberCheckNormal;

            break;

        }

    // do checking   

    TInt err = iCustomPhone.CheckEmergencyNumber ( 

      checkedNumberMode, aIsEmergencyNumber );

    aTelNumber = checkedNumberMode.iNumber;

    return err;

    }

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

// CDosEmergencyNumberPolicy::ReadProductSpecificNumbers

// 

// Reads product specific values from central repository

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

//

void CDosEmergencyNumberPolicy::ReadProductSpecificNumbers()

    {

    // This is done only once in bootup phase.

    iProductSpecificList.Zero();

    TInt err = KErrNone;

        err = iCenRep->Get( KDefaultEmergencyNumbersList, 

                                iProductSpecificList );

    if ( err != KErrNone )

        {

        // just to make sure, if central repository has modified it,

        // even when there was an error.

        iProductSpecificList.Zero();

        }

    }

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

// CDosEmergencyNumberPolicy::IsInListByAdvancedMode

// 

// Checks if the number is in list by advanced mode check.

//

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

//

TBool CDosEmergencyNumberPolicy::IsInListByAdvancedMode ( TDes& aNumber )

    {    

    TLex list( iProductSpecificList );

    TLexMark mark;

    TPtrC token_candidate( KNullDesC() ) ; 

    for ( TInt i = 0; i < KEnPolicySDEmergencyNumberListLength; i++ )

        {

        list.Mark( mark );

        list.SkipCharacters();

        TPtrC token;

        token.Set( list.MarkedToken( mark ) );

        if ( token.Length() && ( token == aNumber.Right( token.Length() ) ) )

            {

            // _DDPRINT( 4, "ENPolicy.SDM.IsInListAdvanced.ok.", place );

            if( token_candidate == KNullDesC )

                { 

                token_candidate.Set( token ); 

                } 

            else 

                { 

                if( token.Length() > token_candidate.Length() ) 

                    { 

                    token_candidate.Set( token );                          

                    } 

                } 

            } 

        list.Inc(); 

        } 

    if( token_candidate != KNullDesC ) 

        { 

        aNumber = token_candidate; 

        return ETrue; 

        }    

    return EFalse;   

    }

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

// CDosEmergencyNumberPolicy::IsInListByNormalMode

// 

// Checks if the number is in list by normal mode check.

//

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

//

TBool CDosEmergencyNumberPolicy::IsInListByNormalMode( const TDesC& aNumber )

    {

    TInt length = aNumber.Length();

    TInt place = iProductSpecificList.Find( aNumber ); // first number of aNumber

    // _DDPRINT( 4, "ENPolicy.SDM.IsInListNormal.ok.", place );    // debug print

    if ( place < 0 )

        {

        // negative value is an error, not found!

        // return immediately

        return EFalse;

        }

    TInt endOfMatch = place + length; // end of number + 1

    // we check the begining

    if ( place > 0 )

        {

        // we are not in the begining of buffer, so we have to check

        // char before that

        if ( iProductSpecificList[ place -1 ] != KEnPolicySDNumberSeparator )

            {

            // this was just a substring numbers before that

            return EFalse;

            }

        }

    // beginning was ok, so we can continue

    // now checking the end

    // there must be atleast one empty space in the end that

    // we do the checking of number end.

    if ( endOfMatch < ( iProductSpecificList.Length() - 2 ) )

        {

        if ( iProductSpecificList[ endOfMatch ] != KEnPolicySDNumberSeparator )

            {

            return EFalse;

            }

        }

    //match is wrong, only part of ememergency number is matched

    int newmatchlen = 0;

    for (int i = place; i < iProductSpecificList.Length(); i++)

        {

        if(iProductSpecificList [i] != KEnPolicySDNumberSeparator )

            newmatchlen++;

        else

            break;  

        }

        if (length != newmatchlen)

            {

            return EFalse;

            }

    // if we get so far, its ok.

    return ETrue;

    }

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

// CDosEmergencyNumberPolicy::ParserNumber

// 

// Removes sip prefixis beging of the number and end of the number after @ char.

// @ character is also removed.

//

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

//

void CDosEmergencyNumberPolicy::ParseNumber( TPhCltTelephoneNumber& aTelNumber )

    {

    // Does number contains prefix. If yes then remove it

    if ( 0 == aTelNumber.FindC( KSipPrefix ) ||

         0 == aTelNumber.FindC( KTelPrefix ) ||

           0 == aTelNumber.FindC( KSosPrefix ) )

        {

        aTelNumber.Delete( 0, KPrefixLength );

          }

        // Does Number contains domain part. If yes remove it at beging of @ character.

      TInt atIndex = aTelNumber.Find( KAt );

      TInt telNumberLength = aTelNumber.Length();

        if ( 0 < atIndex && 

             atIndex < telNumberLength )

        {

            aTelNumber.Delete( atIndex, telNumberLength - atIndex );

            }

    }

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

// CDosEmergencyNumberPolicy::HandleNotifyString

// 

// Inherited from MCenRepNotifyHandlerCallback.

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

//

void CDosEmergencyNumberPolicy::HandleNotifyString( 

    TUint32 aId, const TDesC16& aNewValue )

    {

    if( aId == KDefaultEmergencyNumbersList )

        {

        iProductSpecificList.Zero();

        iProductSpecificList.Copy( aNewValue );

        }

    }

// ========================== OTHER EXPORTED FUNCTIONS =========================

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

// NewEnPolicy()

// 

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

//

EXPORT_C CEmergencyNumberPolicy* NewEnPolicyL()

    {

    return new (ELeave) CDosEmergencyNumberPolicy;

    }

// End of File