/*

* 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 the License "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:  

*

*/

#include "config.h"

#include "SharedTimer.h"

#include <wtf/Assertions.h>

#include <e32std.h>

#include <e32base.h>

static TInt64 remainingMicro = 0;

static bool shutdownInProgress = false;

namespace WebCore {

static CPeriodic* sharedTimer;

static void (*sharedTimerFiredFunction)();

void setSharedTimerFiredFunction(void (*f)())

    {

    ASSERT(!sharedTimerFiredFunction || sharedTimerFiredFunction == f);

    sharedTimerFiredFunction = f;

    }

static TInt timerFired( TAny* /*aPtr*/ )

    {

    if (shutdownInProgress)

        {

        return KErrNone;

        }

    if( remainingMicro == 0 )

        {

        sharedTimerFiredFunction();

        }

    else

        {

        setSharedTimerFireTime( -1 );

        }

    return KErrNone;

    }

void setSharedTimerFireTime(double fireTime)

    {

    if (shutdownInProgress)

        {

        return;

        }

    ASSERT(sharedTimerFiredFunction);

    if (sharedTimer)

        {

        sharedTimer->Cancel();

        delete sharedTimer;

        sharedTimer = NULL;

        }

    if (fireTime != -1)

        remainingMicro = 0;

    sharedTimer = CPeriodic::New( CActive::EPriorityStandard );

    if( sharedTimer )

        {

        TInt64 interval( remainingMicro );

        if( remainingMicro == 0 )

            {

            // fireTime comes in second resolution

            TTime fireDate( TTime(fireTime * 1000000 ).Int64() );

            TTime time;

            time.HomeTime();

            interval = fireDate.Int64() - time.Int64();

            }

        interval = interval < 0 ? 0 : interval;

        //

        TInt t;

        if (interval<(TInt)(KMaxTInt32))

            {

            t = interval;

            remainingMicro = 0;

            }

        else

            {

            t = KMaxTInt32;

            remainingMicro = interval - KMaxTInt32;

            }

        sharedTimer->Start( t, 0, timerFired);

        }

    }

void stopSharedTimer()

    {

    if (sharedTimer)

        {

        sharedTimer->Cancel();

        delete sharedTimer;

        sharedTimer = NULL;

        }

    remainingMicro = 0;

    }

void shutdownSharedTimer()

    {

    shutdownInProgress = true;

    stopSharedTimer();

    }

}