/*

* 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 song scanner.

*

*/

#include "mpsongscanner.h"

#include "mpmpxharvesterframeworkwrapper.h"

#include "mptrace.h"

/*!

    \class MpSongScanner

    \brief Music Player song scanner.

    Song scanner interfaces with MPX Harvesting Framework to harvest

    music files in the device.

*/

/*!

 \fn void scanStarted()

 This signal is emitted when scanning has started.

 */

/*!

 \fn void scanCountChanged( int count )

 This signal is emitted to notify that scan count has changed.

 */

/*!

 \fn void scanFinished( int error, int itemsAdded )

 Emitted when scanning has finished.

 */

/*!

 Constructs the song scanner.

 */

MpSongScanner::MpSongScanner( MpMpxHarvesterFrameworkWrapper *wrapper, QObject *parent )

    : QObject( parent ),

      mMpxHarvesterWrapper(wrapper),

      mScanning( false ),

      mAutomaticScan( true )

{

    TX_ENTRY

    connect( mMpxHarvesterWrapper, SIGNAL( scanStarted() ),

    connect( mMpxHarvesterWrapper, SIGNAL( scanEnded( int, int ) ),

            this, SLOT( handleScanEnded( int, int ) ), Qt::QueuedConnection );

    connect( mMpxHarvesterWrapper, SIGNAL( scanCountChanged( int ) ), 

            this, SIGNAL( scanCountChanged( int ) ), Qt::QueuedConnection );

    // Disk events should be handled asap in order to stop the scan on time

    connect( mMpxHarvesterWrapper, SIGNAL( diskEvent( MpxDiskEvents ) ),

            this, SLOT( handleDiskEvent(MpxDiskEvents) ) );

    TX_EXIT

}

/*!

 Destructs the song scanner.

 */

MpSongScanner::~MpSongScanner()

{

    TX_LOG

}

/*!

 Initiates song scanning.

 */

void MpSongScanner::scan( bool automaticScan )

{

    TX_ENTRY

    if ( !mScanning ) {

        mScanning = true;

        mAutomaticScan = automaticScan;

        mMpxHarvesterWrapper->scan();

    }

    TX_EXIT

}

/*!

 Returns mAutomaticScan value.

 */

bool MpSongScanner::isAutomaticScan()

{

    return mAutomaticScan;

}

/*!

 Cancels ongoing song scanning, if any.

 \sa scan()

 */

void MpSongScanner::cancelScan()

{

    TX_ENTRY

    if ( mScanning ) {

        mScanning = false;

        mMpxHarvesterWrapper->cancelScan();

    }

    TX_EXIT

}

/*!

 Slot called upon notification from MPX Harvesting FW indicating end of

 scanning process.

 */

void MpSongScanner::handleScanEnded( int numItemsAdded, int error )

{

    if (error == KErrDiskFull) {

        emit scanFinished( ScanErrorDiskFull, 0 );

        mScanning = false;

    }

    else{

        if( error < 0) {

            emit scanFinished( ScanGeneralError, numItemsAdded );

        }

        else if ( mScanning ) {

            emit scanFinished( ScanErrorNone, numItemsAdded );

        }

        else {

            // Scan canceled

            emit scanFinished( ScanGeneralError, numItemsAdded );

        }

        mScanning = false;

    }

    TX_EXIT

}

/*!

 Slot to be called when disk event is received from MPX framework.

 */

void MpSongScanner::handleDiskEvent( MpxDiskEvents event )

{

    TX_ENTRY

    Q_UNUSED( event );

    if ( mScanning ) {

        emit scanFinished( ScanInterrupted, 0 );

        mScanning = false;

    }

    TX_EXIT

}