/*

* Copyright (c) 2007 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:  Engine for BS Engine

 *

*/

#include <apgtask.h>

#include <apgwgnam.h>

#include <eikenv.h>

#include <e32base.h>

#include "bsengineglobals.h"

#include "bsdebug.h"

#include "bsengine.h"

#include "bsapplicationinfo.h"

#include "bsconfiguration.h"

// CONSTANTS

const TInt KSecondTaskIndex( 1);

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

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

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

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

//

CBSEngine::CBSEngine()

    {

    iEnv = CEikonEnv::Static( );

    iSwap = EFalse;

    }

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

// Symbian 2nd phase constructor can leave.

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

//

void CBSEngine::ConstructL()

    {

    DEBUG(("Create Engine"));

    iConfiguration = CBSConfiguration::NewL( );

    }

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

// Destructor.

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

//

CBSEngine::~CBSEngine()

    {

    DEBUG(("~CBSEngine"));

    iAppsStack.ResetAndDestroy( );

    iFocusHistory.Close( );

    delete iConfiguration;

    }

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

// Two-phased constructor.

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

//

CBSEngine* CBSEngine::NewL()

    {

    CBSEngine* self = CBSEngine::NewLC( );

    CleanupStack::Pop( self ) ;

    return self;

    }

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

// Two-phased constructor.

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

//

CBSEngine* CBSEngine::NewLC()

    {

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

    CleanupStack::PushL( self );

    self->ConstructL( ) ;

    return self;

    }

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

// 

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

//

void CBSEngine::HandleFocusChangeL( const TUid& aApp )

    {

    DEBUG(("-> HandleFocusChangeL(0x%X)", aApp.iUid ));

    // check if application is not in ignored list

    if ( iConfiguration->IsIgnored( aApp ) )

        {

        DEBUG(("\tIgnore the event - application in ignored list"));

        return;

        }

    TInt fsCount = iFocusHistory.Count( );

    if ( fsCount > 0 && iFocusHistory[fsCount - 1] == aApp.iUid )

        {

        DEBUG(("\tIgnore the event - application already on top"));

        iSwap = EFalse;

        return;

        }

    // check if we should not reset back stepping stack

    if ( iConfiguration->IsReset( aApp ) )

        {

        iSwap = EFalse;

        ResetHistory( );

        }

    // check if we should reset if application was started tru 

    RArray<TInt>& thuApps = iConfiguration->ResetIfThruList( );

    for ( TInt i = 0; i < thuApps.Count( ); i++ )

        {

        // position of application - i.e. fast swap

        if ( aApp.iUid == thuApps[i] )

            {

            //mark that there is a fast swap or dialog

            iSwap = ETrue;

            return;

            }

        else if( iSwap )

            {

            iSwap = EFalse;

            TInt pos = iFocusHistory.Count( ) - 1;

            if ( pos >= 0 )

                {

                TInt currentApp = aApp.iUid;

                TInt prevApp = iFocusHistory[pos];

                if ( currentApp != prevApp )

                    {

                    //we are here as the result of the fast swap

                    ResetHistory( );

                    iFocusHistory.AppendL( thuApps[i] );

                    break;

                    }

                }

            }

        }

    // add application to focus history list, 

    iFocusHistory.AppendL( aApp.iUid );

    }

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

// 

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

//

TInt CBSEngine::HandleActivationEventL( const TUid& aApp,

    const TDesC8& aState, TBool aItem )

    {

    DEBUG(("-> HandleActivationEventL(0x%X, %S, 0x%X)",

                    aApp.iUid, &aState, aItem));

    TInt result(EBSEngineCommandWasNotConsumed);

#ifdef _DEBUG    

    // check from which application it was started 

    for ( TInt i = 0; i< iFocusHistory.Count( ); i++ )

        {

        DEBUG(("\tiFocusHistory[%d] = %X)", i, iFocusHistory[i]));

        }

#endif        

    // is it the same application - i.e. internal state change - ignore       

    CBSApplicationInfo* last(NULL);

    if ( iAppsStack.Count( ) )

        last = iAppsStack[iAppsStack.Count() - 1];

    if ( last && last->AppUid( ) == aApp )

        {

        DEBUG(("\tIgnore the event, application is already on stack"));

        }

    else if ( aItem ) // store only item events

        {

        CBSApplicationInfo* newApp = CBSApplicationInfo::NewLC();

        newApp->SetPrevAppUid( FindPreviousApp( aApp ) );

        newApp->SetAppUid( aApp );

        newApp->SetItemStateL( aState );

        DEBUG(("\tAdd to BS stack app:0x%X, state:%S, prevapp:0x%X)",

                        newApp->AppUid().iUid,

                        &newApp->ItemState(),

                        newApp->PrevAppUid().iUid));

        iAppsStack.AppendL( newApp );

        CleanupStack::Pop( newApp );

        result = EBSEngineCommandWasConsumed;

        }

    return result;

    }

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

// 

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

//

TInt CBSEngine::HandleBackEventL( const TUid& aApp, const TDesC8& aState,

    TBool aCheckOnly )

    {

    DEBUG(("-> HandleBackEventL(0x%X, %S, 0x%X )",

                    aApp.iUid, &aState, aCheckOnly ));

    TInt result(EBSEngineCommandWasNotConsumed);

    // get last application at stack

    CBSApplicationInfo* info(NULL);

    if ( iAppsStack.Count( ) )

        {

        info = iAppsStack[iAppsStack.Count() - 1];

        DEBUG(("\tcheck UIDs (0x%X-0x%X)", aApp.iUid, info->AppUid() ));

        DEBUG(("\tcheck states (%S-%S)", &aState, &info->ItemState()));

        if ( info && info->AppUid( ) == aApp && info->ItemState().Compare( aState ) == 0 )

            {

            DEBUG(("\tcheck prev app, if BS to be ignored = %d)",

                            iConfiguration->IsIgnoredIfStartedFrom( info->PrevAppUid() ) ));

            // check what application activated the application in question 

            if ( !iConfiguration->IsIgnoredIfStartedFrom( info->PrevAppUid( ) ) )

                {

                // find the task which is directly below the current one

                // in window group Z-order hierarchy

                TApaTaskList taskList(iEnv->WsSession( ) );

                // current task is in "0" position, next one is "1"

                // NOTE: FindByPos doesn't return hidden tasks

                TApaTask lowerTask = taskList.FindByPos( KSecondTaskIndex );

                CApaWindowGroupName* apaWGName = CApaWindowGroupName::NewLC(

                    iEnv->WsSession( ), lowerTask.WgId( ) );

                TUid lowerTaskUid = apaWGName->AppUid( );

                CleanupStack::PopAndDestroy( apaWGName );

                DEBUG(("\tcheck task below (0x%X-0x%X)",

                                lowerTaskUid.iUid, info->PrevAppUid().iUid));

                // if the lower task is the one that activated the current one

                // send the current one to background.

                // the condition is false if i.e. the previous active task

                // has been closed or sent to background (no explicit

                // activation of the current task occured)

                if ( lowerTaskUid == info->PrevAppUid( ) )

                    {

                    if ( !aCheckOnly )

                        {

                        SendToBackground( aApp );

                        // remove history for the application    

                        RemoveAppRecord( aApp );

                        }

                    result = EBSEngineCommandWasConsumed;

                    }

                }

            }

        }

    return result;

    }

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

// 

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

//

void CBSEngine::SendToBackground( const TUid& aApp )

    {

    DEBUG(("-> SendToBackgroundL(0x%X)", aApp.iUid ));

    TApaTaskList taskList(iEnv->WsSession( ));

    TApaTask task = taskList.FindApp( aApp );

    if ( task.Exists( ) )

        {

        // Request window server to send application to background

        task.SendToBackground( );

        }

    }

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

// 

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

//    

TUid CBSEngine::FindPreviousApp( const TUid& aApp )

    {

    TUid result(TUid::Null( ));

    for ( TInt i = iFocusHistory.Count( ) - 1; i >= 0; i-- )

        {

        if ( iFocusHistory[i] != aApp.iUid )

            {

            result = TUid::Uid( iFocusHistory[i] );

            break;

            }

        }

    return result;

    }

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

// 

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

//

void CBSEngine::RemoveAppRecord( const TUid& aApp )

    {

    DEBUG(("-> RemoveRecord(0x%X)", aApp.iUid ));

    for ( TInt i = iAppsStack.Count( ) - 1; i >= 0; i-- )

        {

        CBSApplicationInfo* info = iAppsStack[i];

        if ( info->AppUid( ) == aApp )

            {

            DEBUG(("\tRemove item - [%d]", i));

            iAppsStack.Remove( i );

            delete info;

            break;

            }

        }

    }

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

// 

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

//

void CBSEngine::ResetHistory()

    {

    DEBUG(("-> ResetHistory"));

    iAppsStack.ResetAndDestroy( );

    iFocusHistory.Reset( );

    }

// End of File