/*

* Copyright (c) 2007-2009 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:  Communication with server side implementation of

*                Area Registry.

* Part of:      Tactile Feedback.

*

*/

#include <e32std.h>

#include <eikenv.h>

#include <tactileinternaldatatypes.h>

#include <tactilefeedbacktrace.h>

#include "touchfeedbackclient.h"

#include "touchfeedbackimpl.h"

#include "touchfeedbackregistry.h"

#include "OstTraceDefinitions.h"

#ifdef OST_TRACE_COMPILER_IN_USE

#include "touchfeedbackclientTraces.h"

#endif

// Minimun and maximum sized of one shared memory chunk.

const TInt KTactileChunkInitialSize = 4096; // 4kB

const TInt KTactileChunkMaxSize     = 262144; // 256kB

const TUid KTactileClickPluginUid   = { 0x2000B493 };

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

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

// 

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

//

CTouchFeedbackClient::CTouchFeedbackClient( CTouchFeedbackImpl& aFeedback ):

    iClickPlugin ( CEikonEnv::Static()->WsSession()),

    iFeedback( aFeedback )

    {

    }

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

// We do all the initializations in the construction phase. Other option

// would be to postpone these until the first registry entry has been added.

//

// #1 Connect to our ClickPlugin

// #2 Create a shared chunk, which is used for storing this application

//    process' area registry, so that it can be accessed by the window

//    server.

// #3 Set window count to zero in the new chunk

// #4 Try to create a global semaphore to have mutual exclusion on chunks

//    If semaphore already exists, then try to open it.

// #5 Put our chunk name to package buffer, and send it to click plugin

//    so that it can open a handle to our chunk and thus access the shared

//    memory.

// #6 Create a CIdle object that is used for updating the registry in shared

//    memory.

//

// Notice that we will leave in case anything fails. This has to be handled

// on higher level, so that whole application launch will not fail in case

// touch feedback does not work.

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

//

void CTouchFeedbackClient::ConstructL()

    {

    TRACE("CTouchFeedbackClient::ConstructL - Begin");

    // #1 Connect to click plugin

    User::LeaveIfError( iClickPlugin.Construct( KTactileClickPluginUid ) );

    TBool changable = EFalse;

    TBool loaded = iClickPlugin.IsLoaded( changable );  

    if ( !loaded )

        {

        User::Leave( KErrNotSupported );

        }

    // #2 Create shared chunk 

    TTactileFeedbackConnectData data;

    // Set window group identifier

    data.iWindowGroupId = CCoeEnv::Static()->RootWin().Identifier();

    // Now create the chunk

    TInt err = iChunk.CreateGlobal( data.iChunkName, 

                                    KTactileChunkInitialSize, 

                                    KTactileChunkMaxSize );     

    // We have to take into account, that the chunk may already exist.

    // This may happen in case we have been started (and crashed)

    // once already.

    if ( err == KErrAlreadyExists )

        {

        User::LeaveIfError( iChunk.OpenGlobal( data.iChunkName, EFalse ) );

        }

    else if( err != KErrNone )

        {

        User::LeaveIfError( err );

        }

    // #3 Set window count to zero

    TInt* chunkPtr = reinterpret_cast<TInt*>( iChunk.Base() );

    *chunkPtr = 0; // No entries in the chunk in the beginning

    // #4 Try to create/open global semaphore

    err = iSemaphore.CreateGlobal( KTouchFeedbackSemaphore, 1 );

    if ( err == KErrAlreadyExists )

        {

        User::LeaveIfError( iSemaphore.OpenGlobal( KTouchFeedbackSemaphore ) );

        }

    else if( err != KErrNone )

        {

        User::LeaveIfError( err );

        }

    // #5 Send chunk name to window server

    TPckgC<TTactileFeedbackConnectData> dataPkg ( data );

    User::LeaveIfError( iClickPlugin.CommandReply( ETactileOpCodeConnect, 

                                                   dataPkg ) );

    iConnected = ETrue;

    iFeedbackTimer = CPeriodic::NewL( CActive::EPriorityStandard );

    User::LeaveIfError( iFbClient.Connect() );

    // #6 We use Standard priority so that we won't disturb the normal 

    //    functionality of the application, but can get registry updated

    //    fastly enough in case the application does very plenty of 

    //    background prosessing with active objects.

    iIdle = CIdle::NewL( CActive::EPriorityStandard );

    TRACE("CTouchFeedbackClient::ConstructL - End");

    }

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

// 

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

//

CTouchFeedbackClient* CTouchFeedbackClient::NewL( CTouchFeedbackImpl& aFeedback )

    {

    CTouchFeedbackClient* self = 

        new( ELeave ) CTouchFeedbackClient ( aFeedback );

    CleanupStack::PushL( self );

    self->ConstructL();    

    CleanupStack::Pop( self );

    return self;

    }

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

// 

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

//

CTouchFeedbackClient::~CTouchFeedbackClient()

    {

    iChunk.Close();

    iSemaphore.Close();

    if ( iFeedbackTimer )

        {

        iFeedbackTimer->Cancel();

        delete iFeedbackTimer;    

        }

    iFbClient.Close();

    if ( iConnected )

        {

        TTactileFeedbackDisconnectData data;

        data.iWindowGroupId = CCoeEnv::Static()->RootWin().Identifier();

        TPckgC<TTactileFeedbackDisconnectData> dataPkg ( data );

        iClickPlugin.CommandReply( ETactileOpCodeDisconnect, dataPkg );    

        }

    iClickPlugin.Close();  

    delete iIdle;  

    }

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

// In this function we just activate CIdle. The motivation is that this

// way we avoid updating the registry multiple times. For e.g. Calculator

// application launch would cause around 20 registry updates in case we would

// always make changes to shared memory immediately after registry update.

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

//

void CTouchFeedbackClient::RegistryChanged( )

    {

    if ( iIdle && !iIdle->IsActive() )

        {

        iIdle->Start( TCallBack( IdleCallbackL, this ) ); 

        }

    }

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

// Callback for CIdle.

//

// We check the current enabled/disabled status of tactile feedback for

// this application, and either UpdateRegistryToChunkL for updating whole

// registry to shared chunk, or ClearWholeChunkL for clearing all feedback

// areas from the shared chunk.

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

//

TInt CTouchFeedbackClient::IdleCallbackL( TAny* aPtr )

    {

    if ( aPtr )

        {

        CTouchFeedbackClient* self =

            static_cast<CTouchFeedbackClient*> ( aPtr );

        if ( self->iFeedback.FeedbackEnabledForThisApp() )

            {

            self->UpdateRegistryToChunkL();

            }

        else

            {

            self->ClearWholeChunkL();

            }

        }

    return KErrNone;

    }

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

// Area registry is written to shared memory in following format

//

// + Header (four bytes) = Number of windows as TInt

// + Window entries 

// + Area registry entries

// 

// Window entries: For each window:

//   [four bytes] = Window handle 

//   [four bytes] = Number of registry entries in this window 

//   [four bytes] = Offset of registry data from beginning of chunk

// Area registry entries:

//   - Each entry written as TFeedbackChunkAreaEntry straight into memory

//

//

// Steps taken in this function:

//

// #1 Calculate the size needed for area registry data

// #2 Mutual exclusion with global semaphore

// #3 Increase Chunk size in case necessary

// #4 Update Chunk contents. This is now done simply by writing the whole

//    area registry into the shared memory.

// #5 Release semaphore

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

//

void CTouchFeedbackClient::UpdateRegistryToChunkL()

    {

    TRACE( "CTouchFeedbackClient::UpdateRegistryToChunkL - Begin" );

    RPointerArray<CTouchFeedbackRegistry>* registry =

        iFeedback.RegistryArray();

    // Do cleanup so that empty registry instances are not hanging anymore

    TInt windowIndex = 0;

    TInt cleanupAreaCount = 0;

    TInt cleanupWindowCount = 0;

    // value is returned in parameter variable  

    iFeedback.GetAreaCount( cleanupAreaCount, cleanupWindowCount );  

    while ( windowIndex < cleanupWindowCount )

        {

        TBool emptyWindow = ( (*registry)[windowIndex]->AreaCount() == 0 ); 

        if ( emptyWindow )

            {

            // Remove empty/possibly destroyed registry instance that possibly 

            // may refer to destroyed control/window.

            CTouchFeedbackRegistry* feedbackRegistry = (*registry)[windowIndex];

            registry->Remove( windowIndex );

            delete feedbackRegistry;

            cleanupWindowCount--;

            }

        else

            {

            windowIndex++; // to next window

            }

        }

    // #1 Calculate the size needed    

    TInt windowCount(0);

    TInt areaCount(0);

    iFeedback.GetAreaCount( areaCount, windowCount );    

    // Header contains only number of windows in this registry

    TInt headerSize = sizeof( TInt );     

    // There is a list of windows in this registry in the beginning, with

    // data offsets in the chunk    

    TInt windowItemSize = 

        sizeof( TInt ) + // Window handle

        sizeof( TInt ) + // Area count

        sizeof( TInt );  // Offset to area registry entries

    // Size of one area registry entry

    TInt areaItemSize = sizeof( TFeedbackChunkAreaEntry );    

    TInt sizeNeeded =     

        headerSize + 

        windowCount * windowItemSize + 

        areaCount * areaItemSize;

    // #2 Mutual exclusion    

    iSemaphore.Wait();

     // We use cleanup item for making sure that semaphore will not stay

    // reserved in case there is a leave.

    CleanupStack::PushL( TCleanupItem( CleanupSemaphore, &iSemaphore ) );

    // #3 Increase chunk (committed) size in case needed    

    if ( iChunk.Size() < sizeNeeded )

        {

        TInt err = iChunk.Adjust( sizeNeeded );

        if ( err != KErrNone )

            {

            // In case the current registry does not fit to the chunk, then

            // we'll set window count to zero, in case that is possible

            // (it is not possible if chunk size is zero).

            // This means that there won't be any area registry based 

            // feedback for this application on the moment.

            if ( iChunk.Size() > 0 )

                {

                TInt* chunkPtr = reinterpret_cast<TInt*>( iChunk.Base() );

                // Set window count to zero   

                *chunkPtr = 0;           

                }

            // We will leave anyway

            User::Leave( err );

            }

        }

    // #4 Update chunk contents    

    TInt* chunkPtr = reinterpret_cast<TInt*>( iChunk.Base() );

    // Set window count in the beginning of chunk    

    *chunkPtr = windowCount; 

    chunkPtr++;

    TInt areaOffset = headerSize + windowCount * windowItemSize;

    // This is pointer to the first area registry entry in the chunk

    TFeedbackChunkAreaEntry* chunkEntryPtr 

       = reinterpret_cast<TFeedbackChunkAreaEntry*> ( iChunk.Base() + areaOffset );

    // Check if audio or vibra is disabled for this application.

    TBool audioEnabled = iFeedback.FeedbackEnabledForThisApp( ETouchFeedbackAudio );

    TBool vibraEnabled = iFeedback.FeedbackEnabledForThisApp( ETouchFeedbackVibra );

    // One loop round for each window where we have area registry entries.

    for ( TInt windowIndex = 0; windowIndex < windowCount; windowIndex++ )

        {

        RArray<TFeedbackEntry>* windowRegistry = 

            (*registry)[windowIndex]->WindowRegistry();

        // Write handle of this window

        *chunkPtr = (*registry)[windowIndex]->WindowHandle();

        chunkPtr++;

        // Store the address where we shall write count later

        // (We don't know the amount of areas yet, as we shall

        // only add areas of visible controls).

        TInt* countPointer = chunkPtr;

        chunkPtr++;

        // Write offset of the area registry entries of this window

        *chunkPtr = ((TInt)chunkEntryPtr-(TInt)iChunk.Base());

        chunkPtr++;

        // Write all areas of visible controls in this window 

        // to the shared memory. Invisible controls' areas are left out so

        // that they won't mess up the feedback for overlapping visible

        // controls.

        TInt visibleAreaCount = 0;

        for ( TInt areaIndex = windowRegistry->Count()-1; areaIndex >= 0; areaIndex-- )

            {

            TFeedbackEntry entry = (*windowRegistry)[areaIndex];

            if ( entry.iVisible ) 

                {

            chunkEntryPtr->iRect = entry.iRect;

            TInt feedback = ( entry.iFeedbackTypeUp << 10 );

            feedback |= entry.iFeedbackTypeDown;            

            // Add audio and vibra information to feedback type

            if ( entry.iVibraEnabled && vibraEnabled )

                {

                //feedback |= KTactileVibraBit;    

                if ( entry.iFeedbackDown & ETouchFeedbackVibra )

                    {

                    feedback |= KTactileVibraBitDown;    

                    }

                if ( entry.iFeedbackUp & ETouchFeedbackVibra )

                    {

                    feedback |= KTactileVibraBitUp;    

                    }

                }

            if ( entry.iAudioEnabled && audioEnabled )

                {

                //feedback |= KTactileAudioBit;

                if ( entry.iFeedbackDown & ETouchFeedbackAudio )

                    {

                    feedback |= KTactileAudioBitDown;    

                    }

                if ( entry.iFeedbackUp & ETouchFeedbackAudio )

                    {

                    feedback |= KTactileAudioBitUp;    

                    } 

                }

            chunkEntryPtr->iFeedbackType = static_cast<TTouchLogicalFeedback>( feedback );

            chunkEntryPtr->iEventType    = entry.iEventType;    

            chunkEntryPtr++;        

                visibleAreaCount++;      

                }            

            }

        // Now store area count as we know the amount of visible areas

        // for this window.    

        *countPointer = visibleAreaCount;     

        }   

    // #5 Release semaphore so that other processes can access the chunks again    

    // This calls "Signal" on the semaphore

    CleanupStack::PopAndDestroy(&iSemaphore);

    TRACE( "CTouchFeedbackClient::UpdateRegistryToChunkL - End" );

    }

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

// Despite the function name, we don't actually clear whole chunk here

// as that is not necessary. It is enough to set the window count to zero

// at beginning of chunk, as then server will consider this chunk empty.

//

// #1 Mutual exclusion

// #2 Make sure chunk is not of zero -size

// #3 Set window count to zero at beginning of chunk

// #4 Release mutual exclusion

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

//

void CTouchFeedbackClient::ClearWholeChunkL()

    {

    TRACE( "CTouchFeedbackClient::ClearWholeChunkL - Begin" );

    // #1 Mutual exclusion    

    iSemaphore.Wait();

    // We use cleanup item for making sure that semaphore will not stay

    // reserved in case there is a leave.

    CleanupStack::PushL( TCleanupItem( CleanupSemaphore, &iSemaphore ) );

    // We only need four bytes for the data, as we are only going to store

    // one number to the chunk. But we count the space just in case anyway, 

    // because at some point chunks initial size may be change so that it is

    // zero.

    TInt sizeNeeded = sizeof( TInt );

    // #2 Increase chunk (committed) size in case needed    

    if ( iChunk.Size() < sizeNeeded )

        {

        User::LeaveIfError( iChunk.Adjust( sizeNeeded ) );

        }

      // #3 Update chunk contents    

    TInt* chunkPtr = reinterpret_cast<TInt*>( iChunk.Base() );

    // Set window count to zero (this is enough for the server to think

    // that there are no feedback areas at all).

    *chunkPtr = 0; 

    // #4 Release semaphore

    CleanupStack::PopAndDestroy(&iSemaphore);         

    TRACE( "CTouchFeedbackClient::ClearWholeChunkL - End" );

    }

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

// This is a cleanup function for releasing a semaphore in case there will

// be a leave after calling RSemaphore::Wait (otherwise there could easily

// be a deadlock in the system).

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

//

void CTouchFeedbackClient::CleanupSemaphore( TAny* aPtr )

    {

    TRACE( "CTouchFeedbackClient::CleanupSemaphore" );

    if ( aPtr )

        {

        RSemaphore* sem = static_cast<RSemaphore*> ( aPtr );

        sem->Signal();

        }    

    }

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

// Here we just send the logical feedback type to server.

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

//

void CTouchFeedbackClient::ImmediateFeedback( TTouchLogicalFeedback aType,  

    TBool aVibraOn, TBool aAudioOn  )

    {