/*

* 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:

*

*/

#ifndef IRQSONGHISTORYENGINE_H_

#define IRQSONGHISTORYENGINE_H_

#include <QObject>

class IRQMetaData;

class IRQPreset;

class IRQSongHistoryInfo;

class CIRSongHistoryDb;

class IRQSongInfo;

/**

* Engine component for Internet Radio SongHistory.

*/

class IRQSongHistoryEngine : public QObject

{

    Q_OBJECT

public:

    IMPORT_C static IRQSongHistoryEngine* openInstance();

    IMPORT_C void closeInstance();

    /**

    * Get all history from daba base

    * @param    QList<IRQSongHistoryInfo *>

    */

    IMPORT_C void getAllHistory(QList<IRQSongHistoryInfo *>& aSongHistoryArr);

    /**

     * this is songs' get, the above will be changed to the stations only

     */

    IMPORT_C void getAllSongHistory(QList<IRQSongInfo *>& aSongHistoryArr);

    /**

    * Clear all history in data base

    */

    IMPORT_C int clearAllHistory();

    IMPORT_C int clearAllSongHistory();

    /**

    * Called by the UI when a particular channel has been removed from the ISDS.

    */

    IMPORT_C void syncHistory(int aChannelId);

    /**

    * Called by the UI when a particular channel has been changed in the ISDS.

    */

    IMPORT_C void updateSongHistoryDb(int aChannelId,

    /**

    * Connected with play controller with the song name changed.

    * @param    aMetaData   The meta data contains song name, artist and bitrate.

    * @param    aPreset     The preset contains other information.

    */

    IMPORT_C void handleMetaDataReceived(const IRQMetaData& aMetaData, const IRQPreset& aPreset);

    /**

    * Connected with play controller with the song name changed.

    * @param    aMetaData   The meta data contains song name, artist and bitrate.

    * @param    aMusicshopStatus     The music shop status of the song

    */

    IMPORT_C void handleSongMetaDataReceived(const IRQMetaData& aMetaData, QString& aMusicshopStatus);

    /*

     * delete one item from the station history db

     * @param   aIndex    the index of the item need deleted

     */

    IMPORT_C bool deleteOneItem(int aIndex);

private:

    enum TSongHistoryItemChange

    {

        ENOCHANGE = 0,

        ECHANNELCHANGED,

        EMETADATACHANGED,

        EBLANKENTRIES

    };

private:

    /**

     *  Creates IRQSongHistoryEngine instance

     */

    static IRQSongHistoryEngine* createInstanceL();

    void constructL();

    /**

    * Constructor.

    */

    IRQSongHistoryEngine();

    /**

    * Destructor.

    */

    ~IRQSongHistoryEngine();

    TSongHistoryItemChange detectSongHistoryItemChangesL(const IRQMetaData& aMetaData, const QString& aChannelName);

    void handleMetaDataReceivedL(const IRQMetaData& aMetaData, const IRQPreset& aPreset);

	void getAllHistoryL(QList<IRQSongHistoryInfo *>& aSongHistoryArr);

	void handleSongMetaDataReceivedL(const IRQMetaData& aMetaData, QString& aMusicshopStatus);

    void getAllSongHistoryL(QList<IRQSongInfo *>& aSongHistoryArr);

private:

    /** An instance of songhistory database. */

    CIRSongHistoryDb* iSongHistoryDb;

    /**

     * Number of objects currently referring to the singleton object IRQSongHistoryEngine

     */

    int iSingletonInstances;

};

#endif //IRQSONGHISTORYENGINE_H_