/*

* Copyright (c) 2006 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 view utility

*

*/

// INCLUDE FILES

#include <eikenv.h>

#include <eikapp.h>

#include <eikappui.h>

#include <centralrepository.h>

#include <mpxprivatecrkeys.h>

#include "mpxviewutilitycommanddef.h"

#include "mpxviewhistory.h"

#include "mpxviewutilityhelper.h"

#include "mpxviewutilityimp.h"

#include "mpxviewpluginhandler.h"

#include "mpxlog.h"

// CONSTANTS

_LIT( KMPXDelimiter, ";" );

const TInt KMPXMaxHistoryLength( 255 );

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

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

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

// might leave.

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

//

CMPXViewUtilityImp::CMPXViewUtilityImp()

    {

    // Do nothing

    }

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

// By default Symbian 2nd phase constructor is private.

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

//

void CMPXViewUtilityImp::ConstructL()

    {

    iPluginManager = CMPXViewPluginHandler::NewL( this, *this );

    iCurrentView = CMPXViewHistory::NewL();

    ConstructDefaultViewHistoryL();

    }

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

// Two-phased constructor.

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

//

CMPXViewUtilityImp* CMPXViewUtilityImp::NewL()

    {

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

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

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

// Destructor

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

//

CMPXViewUtilityImp::~CMPXViewUtilityImp()

    {

    delete iPreviousView;

    delete iCurrentView;

    delete iDefaultView;

    delete iPluginManager;

    iDefaultHistoryPath.ResetAndDestroy();

    iCurrentHistoryPath.ResetAndDestroy();

    iObservers.Reset();

    }

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

// Retrieves view utility from TLS. Creates if it's not there.

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

//

MMPXViewUtility* CMPXViewUtilityImp::UtilityL()

    {

    MPX_FUNC( "CMPXViewUtilityImp::UtilityL" );

    MMPXViewUtility* utility = reinterpret_cast<MMPXViewUtility*>( Dll::Tls() );

    if ( !utility )

        {

        utility = CMPXViewUtilityImp::NewL();

        StoreViewUtility( utility );

        }

    static_cast<CMPXViewUtilityImp*>( utility )->iRefCount++;

    return utility;

    }

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

// Store view utility to TLS.

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

//

void CMPXViewUtilityImp::StoreViewUtility( MMPXViewUtility* aUtility )

    {

    Dll::SetTls( aUtility );

    }

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

// From MMPXViewUtility

// This method must be called when the client no longer needs this instance.

// This object will be destroyed when no one is using it.

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

//

void CMPXViewUtilityImp::Close()

    {

    ASSERT( iRefCount > 0 );

    MPX_FUNC_EX( "CMPXViewUtilityImp::Close" );

    MPX_DEBUG2( "CMPXViewUtilityImp::Close ref count = %d", iRefCount );

    if ( --iRefCount == 0 )

        {

        MPX_DEBUG1( "CMPXViewUtilityImp::Close deleting this" );

        // last client released

        StoreViewUtility( NULL );

        delete this;

        }

    }

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

// From MMPXViewUtility

// Activate view by resolving passed uid.

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

//

void CMPXViewUtilityImp::ActivateViewL(

    const TUid& aUid,

    const TDesC* aParam )

    {

    RArray<TUid> array;

    CleanupClosePushL( array );

    array.AppendL( aUid );

    ActivateViewL( array, EFalse, EFalse, aParam );

    CleanupStack::PopAndDestroy( &array );

    }

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

// From MMPXViewUtility

// Activate view by resolving passed uids.

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

//

void CMPXViewUtilityImp::ActivateViewL(

    const RArray<TUid>& aUids,

    const TDesC* aParam )

    {

    ActivateViewL( aUids, EFalse, EFalse, aParam );

    }

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

// From MMPXViewUtility

// Activate view as default view, does not bring to foreground.

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

//

void CMPXViewUtilityImp::SetAsDefaultViewL( const TUid& aUid )

    {

    RArray<TUid> array;

    CleanupClosePushL( array );

    array.AppendL( aUid );

    SetAsDefaultViewL( array );

    CleanupStack::PopAndDestroy( &array );

    }

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

// From MMPXViewUtility

// Activate view by resolving passed uids.

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

//

void CMPXViewUtilityImp::SetAsDefaultViewL( const RArray<TUid>& aUids )

    {

    TInt count = iCurrentHistoryPath.Count();

    if ( count > 0 )

        {

        User::Leave( KErrAlreadyExists );

        }

    else

        {

        TUid pluginType( KNullUid );

        TUid pluginImpUid( KNullUid );

        CMPXViewPlugin* plugin(

            iPluginManager->ResolvePluginL( aUids, pluginType, pluginImpUid ) );

        MPX_DEBUG4( "CMPXViewUtilityImp::SetAsDefaultViewL adding type: 0x%x, impUid: 0x%x, address: 0x%x to current view history",

            pluginType.iUid, pluginImpUid.iUid, plugin );

        CMPXViewHistory* viewHistory = CMPXViewHistory::NewL( aUids, pluginType, pluginImpUid, plugin );

        iCurrentHistoryPath.Append( viewHistory ); // iCurrentHistoryPath takes ownership

        delete iCurrentView;

        iCurrentView = NULL;

        iCurrentView = CMPXViewHistory::NewL( viewHistory );

        delete iDefaultView;

        iDefaultView = NULL;

        iDefaultView = CMPXViewHistory::NewL( viewHistory );

        NotifyObservers( ActiveViewType(), PreviousViewType() );

        MPX_DEBUG2( "CMPXViewUtilityImp::SetAsDefaultViewL activating 0x%x as default view", pluginType.iUid );

        TRAPD( err, plugin->SetAsDefaultViewL() );

        if ( err != KErrNone )

            {

            MPX_DEBUG2( "CMPXViewUtilityImp::SetAsDefaultViewL error duing SetAsDefaultViewL, leaving with code %d", err );

            // error during activation, clean up view history

            MarkViewAsClosedL( plugin );

            User::Leave( err );

            }

        else if ( ActiveViewType() != pluginType )

            {

            // notify observers again if the view type has changed

            // possibily because ActivateViewL of the plugin is sync

            // and the plugin exited already

            MPX_DEBUG1( "CMPXViewUtilityImp::SetAsDefaultViewL notifying observers again" );

            NotifyObservers( ActiveViewType(), PreviousViewType() );

            }

        else

            {

            // nothing to do

            }

        }

    }

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

// From MMPXViewUtility

// Activate previous view.

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

//

void CMPXViewUtilityImp::ActivatePreviousViewL()

    {

    // if can't find default history in cenrep, don't use default history

    if ( iCurrentHistoryPath.Count() > 1 )

        {

        TBool jump( EFalse );

        // previousViewType contains a list of view types that needs to be checked

        TUid previousViewType = KNullUid;

        if ( iDefaultHistoryPath.Count() > 0 )

            {

            // default path exist, check that

            TUid currentViewType(

                iCurrentHistoryPath[ iCurrentHistoryPath.Count() - 1 ]->iPluginType );

            TInt count( iDefaultHistoryPath.Count() );

            // loop starts at one, since there's no previous view in index 0

            for ( TInt i = 1; i < count && previousViewType == KNullUid; i++ )

                {

                if ( iDefaultHistoryPath[ i ]->iPluginType == currentViewType )

                    {

                    previousViewType = iDefaultHistoryPath[ i - 1 ]->iPluginType;

                    }

                }

            if ( previousViewType != KNullUid )

                {

                jump = ETrue;

                // if previousViewType exist in iCurrentHistoryPath, it's not a jump

                count = iCurrentHistoryPath.Count();

                for ( TInt i = 0; ( ( i < count ) && ( jump ) ); i++ )

                    {

                    if ( iCurrentHistoryPath[ i ]->iPluginType == previousViewType )

                        {

                        jump = EFalse;

                        }

                    }

                MPX_DEBUG2( "CMPXViewUtilityImp::ActivatePreviousViewL activating jump = %d", jump );

                }

#ifdef _DEBUG

            else

                {

                // current UID doesn't exist in default path, just follow the current path

                MPX_DEBUG1( "CMPXViewUtilityImp::ActivatePreviousViewL activating current UID doesn't exist in default path" );

                }

#endif // _DEBUG

            }

#ifdef _DEBUG

        else

            {

            // default path doesn't exist, just use current history path

            MPX_DEBUG1( "CMPXViewUtilityImp::ActivatePreviousViewL activating without default history" );

            }

#endif // _DEBUG

        RArray<TUid> array;

        CleanupClosePushL( array );

        TInt lastIndex( iCurrentHistoryPath.Count() - 1 );

        TBool updatePreviousView( EFalse );

        TBool activatingPreviousView( EFalse );

        UpdatePreviousViewInfoL( lastIndex );

        if ( jump )

            {

            if ( previousViewType != KNullUid )

                {

                MPX_DEBUG2( "CMPXViewUtilityImp::ActivatePreviousViewL activating 0x%x jumped", previousViewType.iUid );

                updatePreviousView = ETrue;

                array.AppendL( previousViewType );

                }

            }

        else

            {

            TInt count = iCurrentHistoryPath[ lastIndex - 1 ]->iUids.Count();

            MPX_DEBUG2( "CMPXViewUtilityImp::ActivatePreviousViewL activating not jumped iUid.Count %d", count );

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

                {

                TUid u = iCurrentHistoryPath[ lastIndex - 1 ]->iUids[ i ];

                MPX_DEBUG2( "CMPXViewUtilityImp::ActivatePreviousViewL activating not jumped, appending 0x%x", u.iUid );

                array.AppendL( u );

                }

            activatingPreviousView = ETrue;

            }

        // last index is current view, previous view is at last index - 1

        delete iCurrentHistoryPath[ lastIndex ];

        iCurrentHistoryPath.Remove( lastIndex );

        iCurrentHistoryPath.Compress();

        ActivateViewL( array, activatingPreviousView, updatePreviousView );

        CleanupStack::PopAndDestroy( &array );

        }

    else

        {

        // no history

        User::Leave( KErrNotFound );

        }

    }

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

// From MMPXViewUtility

// Pre-load view plug-ins that have KMPXVpFeaturePreLoaded flag set.

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

//

void CMPXViewUtilityImp::PreLoadViewsL()

    {

    MPX_FUNC( "CMPXViewUtilityImp::PreLoadViewsL" );

	PreLoadViewsL( KNullUid );

    }

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

// From MMPXViewUtility

// Pre-load view plug-ins that have KMPXVpFeaturePreLoaded flag set and also by resolving UID

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

//

void CMPXViewUtilityImp::PreLoadViewsL( const TUid& aUid )

    {

    MPX_DEBUG2( "CMPXViewUtilityImp::PreLoadViewsL aUid: 0x%x", aUid );

    RArray<TUid> array;

    CleanupClosePushL( array );

    // Get list of plug-ins that need to be pre-loaded

   	iPluginManager->GetPreLoadPluginsL( array, aUid );

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

        {

        MPX_DEBUG2( "CMPXViewUtilityImp::PreLoadViewsL loading UID: 0x%x", array[i] );

        CMPXViewPlugin* plugin = iPluginManager->PluginL( array[i] );

        plugin->CreateViewL();

        }

    CleanupStack::PopAndDestroy( &array );

    }

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

// From MMPXViewUtility

// Pre-load view plug-in by resolving passed uid.

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

//

void CMPXViewUtilityImp::PreLoadViewL( const TUid& aUid )

    {

    TUid pluginType( KNullUid );

    TUid pluginImpUid( KNullUid );

    CMPXViewPlugin* plugin(

        iPluginManager->ResolvePluginL( aUid, pluginType, pluginImpUid ) );

    plugin->CreateViewL();

    }

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

// From MMPXViewUtility

// Get a reference to view plugin manager.

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

//

MMPXViewPluginManager& CMPXViewUtilityImp::ViewPluginManager()

    {

    return *iPluginManager;

    }

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

// From MMPXViewUtility

// Constructs default view history

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

//

TUid CMPXViewUtilityImp::ConstructDefaultViewHistoryL()

    {

    iDefaultHistoryPath.ResetAndDestroy();

    delete iDefaultView;

    iDefaultView = NULL;

    CRepository* cenRepository = CRepository::NewLC( KCRUidMPXSettings );

    TBool isEmbedded = CEikonEnv::Static()->StartedAsServerApp();

    MPX_DEBUG2( "CMPXViewUtilityImp::ConstructDefaultViewHistoryL isEmbedded: %d", isEmbedded );

    // check if embeded mode, if embeded mode use host application uid

    // CAiwGenericParamList

    // if not embeded mode, use app uid

    // get default paths

    TUid settingsUid( KNullUid );

    if ( isEmbedded )

        {

        // TO-DO: get host UID

        }

    else

        {

        CEikAppUi* appUi = CEikonEnv::Static()->EikAppUi();

        if ( appUi )

            {

            CEikApplication* app = appUi->Application();

            if ( app )

                {

                settingsUid = app->AppDllUid();

                }

            }

        }

    TInt ret ( KErrGeneral );

    HBufC* defaultPath = HBufC::NewLC( KMPXMaxHistoryLength );

    MPX_DEBUG2( "CMPXViewUtilityImp::ConstructDefaultViewHistoryL trying to read default history from uid 0x%x", settingsUid.iUid );

    TPtr dPathPtr = defaultPath->Des();

    ret = cenRepository->Get( settingsUid.iUid, dPathPtr );

    if ( ret == KErrNone )

        {

        TPtrC defaultPathPtr( *defaultPath );

        TInt nextLoc = defaultPathPtr.Find( KMPXDelimiter );

        TBool defaultSet( EFalse );

        while ( nextLoc != KErrNotFound )

            {

            TPtrC currentPath = defaultPathPtr.Left( nextLoc );

            AddToDefaultViewHistoryL( currentPath );

            if ( !defaultSet && iDefaultHistoryPath.Count() == 1 )

                {

                // first entry is the default view

                iDefaultView = CMPXViewHistory::NewL( iDefaultHistoryPath[0] );

                defaultSet = ETrue;

                }

            defaultPathPtr.Set( defaultPathPtr.Mid( nextLoc + 1 ) );

            nextLoc = defaultPathPtr.Find( KMPXDelimiter );

            }

        if ( defaultPathPtr.Length() > 0 )

            {

            AddToDefaultViewHistoryL( defaultPathPtr );

            }

        }

    else

        {

        // get default view

        HBufC* defaultView = HBufC::NewLC( KMPXMaxHistoryLength );

        TPtr dViewPtr = defaultView->Des();

        ret = cenRepository->Get( KMPXVUCurrentDefaultView, dViewPtr );

        if ( ret == KErrNone )

            {

            TPtrC defaultViewPtr( *defaultView );

            if ( defaultViewPtr.Length() > 0 )

                {

                TInt nextPos( 0 );

                TInt err(

                    CMPXViewUtilityHelper::ExtractNum( defaultViewPtr, nextPos, ret ) );

                if ( err == KErrNone )

                    {

                    iDefaultView = CMPXViewHistory::NewL();

                    iDefaultView->iPluginType = TUid::Uid( ret );

                    if ( iDefaultHistoryPath.Count() > 0 )

                        {

                        TRAP( ret, AddToDefaultViewHistoryL( defaultViewPtr, 0 ) );

                        }

                    }

                if ( iDefaultHistoryPath.Count() == 0 && err != KErrNone )

                    {

                    ret = err;

                    }

                }

            }

        CleanupStack::PopAndDestroy( defaultView );

        }

    CleanupStack::PopAndDestroy( defaultPath );

    // clean up duplicate entries

    TInt count( iDefaultHistoryPath.Count() );

    TUid previousUid( KNullUid );

    for ( TInt i = count - 1; i >= 0; i-- )

        {

        if ( iDefaultHistoryPath[ i ]->iPluginType == previousUid )

            {

            MPX_DEBUG3( "CMPXViewUtilityImp::ConstructDefaultViewHistoryL removing duplicate entry 0x%x at %d", iDefaultHistoryPath[ i ]->iPluginType.iUid, i );

            // duplicate entry, remove

            delete iDefaultHistoryPath[ i ];

            iDefaultHistoryPath.Remove( i );

            }

        else

            {

            previousUid = iDefaultHistoryPath[ i ]->iPluginType;

            }

        }

    iDefaultHistoryPath.Compress();

    MPX_DEBUG2( "CMPXViewUtilityImp::ConstructDefaultViewHistoryL after clean up, default path contains %d elements", iDefaultHistoryPath.Count() );

    CleanupStack::PopAndDestroy( cenRepository );

    return DefaultViewUid();

    }

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

// Push default history to view history

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

//

void CMPXViewUtilityImp::PushDefaultHistoryL()

    {

    MPX_FUNC( "CMPXViewUtilityImp::PushDefaultHistoryL" );

    TInt count( iDefaultHistoryPath.Count() );

    iCurrentHistoryPath.ResetAndDestroy();

    delete iPreviousView;

    iPreviousView = NULL;

    if ( count > 0 )

        {

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