#include <qhash.h>

#include <qmap.h>

static const char* DOCML_NAME_VC_COLLECTIONWIDGET     = "vc:mCollectionWidget";

static const char* DOCML_NAME_VC_COLLECTIONCONTENTWIDGET = "vc:mCollectionContentWidget";

static const char* DOCML_NAME_NO_VIDEOS_LABEL         = "vc:mNoVideosLabel";

static const char* DOCML_NAME_CHECK_CONTAINER         = "mCheckBoxContainer";

// async loading timeout

static const int ASYNC_FIND_TIMEOUT                   = 50; // ms

class QActionGroup;

class HbAction;

class VideoCollectionUiLoader:

    public QObject,

    public HbDocumentLoader

    Q_OBJECT

private:

    /** actions used in menus and toolbars */

    enum ActionIds

    {

        EActionSortBy          =  1,

        EActionSortByDate,

        EActionSortByName,

        EACtionSortByItemCount,

        EActionSortByLength,

        EActionSortBySize,

        EActionNewCollection,

        EActionAddToCollection,

        EActionDelete,

        ETBActionAllVideos,

        ETBActionCollections,

        ETBActionServices,

        ETBActionAddVideos,

        ETBActionRemoveVideos,

        ETBActionSortVideos

    };

    /** VideoCollectionUiLoader parameter class */ 

    class Params

    {

    public:

        Params(const QString& name,

            bool isWidget = false,

            QObject *receiver = 0,

            const char *docml = 0,

            const char *member = 0):

            mName(name),

            mIsWidget(isWidget),

            mReceiver(receiver),

            mDocml(docml),

            mMember(member)

            {

            // nothing to do 

            }

        bool isDuplicate(const Params& params) const

            {

            bool isSame(false);

            if (mName == params.mName &&

                mReceiver == params.mReceiver &&

                mDocml == params.mDocml &&

                mMember == params.mMember)

            {

                isSame = true;

            }

            return isSame;

            }

    public:

        QString mName;

        bool mIsWidget;

        QObject *mReceiver;

        const char *mDocml;

        const char *mMember;

    };

    /**

     * C++ constructor.

     */

    /**

     * C++ destructor.

     */

    virtual ~VideoCollectionUiLoader();

    /**

     * Starts to load a specified UI section.

     * 

     * @param uiSection, UI section to load.

     * @param receiver, Receiver of a ready signal.

     * @param widgetSlot, Slot which is called when a widget is ready.

     * @param objectSlot, Slot which is called when an object is ready.

     * @return None.

     */

    void startLoading(QSet<QString> uiSections,

        QObject *receiver,

        const char *widgetSlot,

        const char *objectSlot);

    T* findWidget(const QString &name)

        return qobject_cast<T*>(doFindWidget(name));

    T* findObject(const QString &name)

        return qobject_cast<T*>(doFindObject(name));

    /**

     * Set video services in use.

     */

    void setIsService(bool isService);

signals:

    /**

     * Signals that widget has been loaded asynchonously.

     * 

     * @param widget, Widget which was loaded.

     * @param name, Name of the widget in document.

     * @return None.

     */

    void widgetReady(QGraphicsWidget *widget, const QString &name);

    /**

     * Signals that object has been loaded asynchonously.

     * 

     * @param object, Object which was loaded.

     * @param name, Name of the object in document.

     * @return None.

     */

    void objectReady(QObject *object, const QString &name);

public:

    /**

     * Loads widget from document.

     * 

     * @param name, Widget name.

     * @return QGraphicsWidget*.

     */

    QGraphicsWidget* doFindWidget(const QString &name);

    /**

     * Loads object from document.

     * 

     * @param name, Widget name.

     * @return QGraphicsWidget*.

     */

    QObject* doFindObject(const QString &name);

    /**

     * Adds a ui section to async loading queue.

     */

    void addToQueue(Params &params);

    /**

     * Init a specific widget.

     */

    void initWidget(QGraphicsWidget *widget,

        const QString &name);

    /**

     * Init a specific object.

     */

    void initObject(QObject *object,

        const QString& name);

private:

    /** from QObject */

    void timerEvent(QTimerEvent *event); 

    /** from HbDocumentLoader */

    QObject *createObject(const QString& type, const QString &name);

private:

    /**

     * Run next async find request from queue.

     */

    void runNext();

    /**

     * Check that set params are valid.

     */

    bool isValid(const Params &params);

private:

    /** async queue */

    QList<Params> mQueue;

    /** timer id */

    int mTimerId;

    /** list of loaded widgets */

    QHash<QString, QGraphicsWidget*> mWidgets;

    /** list of loaded objects */

    QHash<QString, QObject*> mObjects;

    /** menu actions */

    QMap<ActionIds, HbAction*> mMenuActions;

    /** toolbar actions */

    QMap<ActionIds, HbAction*> mToolbarActions;

    /** action group for "sort by" actions */

    QActionGroup* mSortGroup;

    /** is service */

    bool mIsService;