/*

* Copyright (c) 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: Music Player application monitor utility - private implementation.

*

*/

#include <apgtask.h>

#include <AknTaskList.h>

#include "mpapplicationmonitor_p.h"

#include "mpapplicationmonitor.h"

#include "mptrace.h"

// -1 means the window will never be visible.

const TInt KWindowGroupPriority = -1;

/*!

    \class MpApplicationMonitorPrivate

    \brief Music Player application monitor utility - private implementation.

*/

/*!

 Constructor

 */

MpApplicationMonitorPrivate::MpApplicationMonitorPrivate( MpApplicationMonitor *qq )

    : CActive( CActive::EPriorityStandard ),

      q_ptr( qq )

{

    TX_ENTRY_ARGS( "Q pointer=" << ( void * )qq )

    CActiveScheduler::Add( this );

    TX_EXIT

}

/*!

 Destructor

 */

MpApplicationMonitorPrivate::~MpApplicationMonitorPrivate()

{

    TX_LOG

    // Cancel any outstanding request

    Cancel();

    iWindowGroup.Close();

    iWsSession.Close();

    TX_EXIT

}

/*!

 \internal

 */

void MpApplicationMonitorPrivate::init( quint32 clientSecureId )

{

    TX_ENTRY

    iHostUid = TUid::Uid( clientSecureId );

    TRAPD( err, DoInitL() );

    if ( err != KErrNone ) {

        TX_LOG_ARGS( "Error: " << err << "; should never get here." );

    }

    TX_EXIT

}

/*!

 Request if music player application is running.

 */

bool MpApplicationMonitorPrivate::isApplicationRunning()

{

    TX_ENTRY

    bool running = false;

    TRAPD( err, running = DoIsApplicationRunningL() );

    if ( err != KErrNone ) {

        TX_LOG_ARGS( "Error: " << err << "; should never get here." );

    }

    TX_EXIT

    return running;

}

/*!

 \internal

 Checks if the chosen app is launched

 */

void MpApplicationMonitorPrivate::RunL()

    {

    // Get the status of this object.

    const TInt errCode( iStatus.Int() );

    TX_ENTRY_ARGS("Status=" << errCode);

    if ( KErrNone == errCode ) {

        TWsEvent event;

        iWsSession.GetEvent( event );

        if ( event.Type() == EEventWindowGroupsChanged ) {

            emit q_ptr->applicationStatusChanged( isApplicationRunning() );

        }

        TX_LOG_ARGS("OK, renewing request");

        StartMonitor();

    }

    else if ( KErrCancel != errCode ) {

        TX_LOG_ARGS("Renewing request after error: " << errCode);

        StartMonitor();

    }

    else {

        TX_LOG_ARGS("cancelled");

    }

    TX_EXIT

}

/*!

 \internal

 Cancel the outstanding request.

 */

void MpApplicationMonitorPrivate::DoCancel()

{

    TX_ENTRY

    iWsSession.EventReadyCancel();

    TX_EXIT

}

/*!

 \internal

 */

void MpApplicationMonitorPrivate::DoInitL()

{

    TX_ENTRY

    CreateWindowGroupL();

    StartMonitor();

    TX_EXIT

}

/*!

 \internal

 */

bool MpApplicationMonitorPrivate::DoIsApplicationRunningL()

{

    TX_ENTRY

    bool taskExists = false;

    CAknTaskList* taskList = CAknTaskList::NewL( iWsSession );

    TApaTask task = taskList->FindRootApp( iHostUid );

    delete taskList;

    taskExists = task.Exists();

    TX_LOG_ARGS("taskExists=" << taskExists);

    return taskExists;

}

/*!

 \internal

 Creates a window group and hides it from the UI.

 */

void MpApplicationMonitorPrivate::CreateWindowGroupL()

{

    TX_ENTRY

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

    RWindowGroup wg( iWsSession );

    // Make a handle from the address of window group object

    User::LeaveIfError( wg.Construct( reinterpret_cast<TUint32>( &wg ) ) );

    User::LeaveIfError( wg.EnableGroupChangeEvents() );

    // Get the ordinal position of this window group

    const TInt ordPos( wg.OrdinalPosition() );

    // Set priority so it's hidden in the UI

    wg.SetOrdinalPosition( ordPos, KWindowGroupPriority );

    // Needs to be a member variable. Must be closed in destructor.

    // Otherwise can't monitor what has been opened.

    iWindowGroup = wg;

    iWsSession.Flush();

    TX_EXIT

}

/*!

 \internal

 Starts event monitoring.

 */

void MpApplicationMonitorPrivate::StartMonitor()

{

    TX_ENTRY

    Cancel();

    iWsSession.EventReady( &iStatus );

    SetActive();

    TX_EXIT

}