/*

 * 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: Proxy model for view in add to homescreen mode.

 *

 */

#include <QObject>

#include <canotifier.h>

#include "hscontentservice.h"

#include "hsaddmodeproxymodel.h"

#include "hsmenuitemmodel.h"

#include "hsapplibstateutils.h"

/*!

 \class HsAddModeProxyModel

 \ingroup group_hsmenustateplugin

 \brief Proxy Model for add to homescreen mode.

 Filtering cwrt widgets to not displaing them in add mode when they are alredy present on HS.

 \lib ?library

 \see QSortFilterProxyModel

 */

/*!

 Constructor.

 \param parent parent for object.

 */

HsAddModeProxyModel::HsAddModeProxyModel(QObject *parent) :

    QSortFilterProxyModel(parent),

    mCwrtWidgetCache(),

    mQuery()

{

    initilizeCwrtWidgetCache();

    invalidateFilter();

    connect(HsContentService::instance(),

        SIGNAL(widgetAdded(const QString &, const QVariantHash &)),

        this, SLOT(updateCacheOnAddWidget(const QString&, const QVariantHash&)));

    connect(HsContentService::instance(),

        SIGNAL(widgetRemoved(const QString &, const QVariantHash &)),

        this, SLOT(updateCacheOnRemoveWidget(const QString&, const QVariantHash&)));

    // create notifier for a cwrt widgets with query created in initilizeCwrtWidgetCache

    CaNotifierFilter filter(mQuery);

    mNotifier.reset(CaService::instance()->createNotifier(filter));

    connect(mNotifier.data(),

            SIGNAL(entryChanged(const CaEntry&, ChangeType)),

            this,

            SLOT(updateEntryStatus(const CaEntry&, ChangeType)));

}

/*

 Destructor.

 */

HsAddModeProxyModel::~HsAddModeProxyModel()

{

}

void HsAddModeProxyModel::initilizeCwrtWidgetCache()

{

    QStringList entryTypeNames;

    entryTypeNames.append(applicationTypeName());

    mQuery.setEntryTypeNames(entryTypeNames);

    mQuery.setAttribute(swTypeKey(), HS_CWRT_APP_TYPE);

    mQuery.setAttribute(widgetUriAttributeName(),

                       HS_WIDGET_URI_ATTRIBUTE_CWRT_VALUE);

    QList< QSharedPointer<CaEntry> > entries =

            CaService::instance()->getEntries(mQuery);

    foreach (QSharedPointer<CaEntry> entry, entries) {

        QVariantHash preferences;

        QMap<QString, QString> attributes = entry->attributes();

        QMapIterator<QString, QString> i(attributes);

        while (i.hasNext()) {

            i.next();

            QString key(i.key());

            QString value(i.value());

            if (key.contains(widgetParam())) {

                preferences.insert(key.remove(widgetParam()),value);

            }

        }

        int count(0);

        HsContentService::instance()->widgets(

                HS_WIDGET_URI_ATTRIBUTE_CWRT_VALUE,preferences,count);

        mCwrtWidgetCache.insert(entry->id(), count > 0);

    }

}

/*!

 Return entryid for given Cwrt with mini view widget.

 \param uri of a widget.

 \param preferences widget preferences.

 \retval int entry id or 0 for not cwrt with mini view widgets.

 */

int HsAddModeProxyModel::findCwrtWidgetEntryId(const QVariantHash &preferences)

{

    int result = 0;

    CaQuery query;

    QStringList entryTypeNames;

    query.setEntryTypeNames(entryTypeNames);

    query.setAttribute(swTypeKey(), HS_CWRT_APP_TYPE);

    query.setAttribute(widgetUriAttributeName(),

            HS_WIDGET_URI_ATTRIBUTE_CWRT_VALUE);

    foreach (QString key, preferences.keys()) {

        query.setAttribute(widgetParam()+key,

            preferences.value(key).toString());

    }

    QList< QSharedPointer<CaEntry> > entries =

        CaService::instance()->getEntries(query);

    if( entries.count() > 0 )

    {

        result = entries[0]->id();

    }

    return result;

}

/*

 Slot called when widget is added to homescreen.

 If widget is removed we checkhow many instance of this widget is left on HS.

 \param uri of a widget.

 \param preferences widget preferences.

 */

void HsAddModeProxyModel::updateCacheOnAddWidget(const QString &uri,

    const QVariantHash &preferences){

	if (uri == HS_WIDGET_URI_ATTRIBUTE_CWRT_VALUE) {

        int entryId = findCwrtWidgetEntryId(preferences);

        if (!mCwrtWidgetCache.value(entryId) ) {

            mCwrtWidgetCache.insert(entryId,true);

            invalidateFilter();

        }

    }

}

/*

 Slot called when widget is removed from homescreen.

 If widget is removed we checkhow many instance of this widget is left on HS.

 \param uri of a widget.

 \param preferences widget preferences.

*/

void HsAddModeProxyModel::updateCacheOnRemoveWidget(const QString &uri,

    const QVariantHash &preferences)

{

    if (uri == HS_WIDGET_URI_ATTRIBUTE_CWRT_VALUE) {

        int entryId = findCwrtWidgetEntryId(preferences);

        if (mCwrtWidgetCache.value(entryId)) {

            mCwrtWidgetCache.insert(entryId,false);

            invalidateFilter();

        }

    }

}

/*

 Reimplementated from QSortFilterProxyModel.

 \param source_row row in source model.

 \param source_parent source parent index.

 */

bool HsAddModeProxyModel::filterAcceptsRow(int source_row,

        const QModelIndex &source_parent) const

{

    QVariant entryId = sourceModel()->data(

            sourceModel()->index(source_row,0,source_parent),

            CaItemModel::IdRole);

    return !mCwrtWidgetCache.value(entryId.toInt());

}

/*

 Update cache if some cwrt widgets were install/uninstal/update or on mmc card.

 \param entry changed entry.

 \param changeType the type of the change. 

 */

void HsAddModeProxyModel::updateEntryStatus(const CaEntry &entry, ChangeType changeType)

{

    if (changeType == RemoveChangeType) {

        mCwrtWidgetCache.remove(entry.id());

    } else {

        mCwrtWidgetCache.insert(entry.id(),

            HsAppLibStateUtils::isCWRTWidgetOnHomeScreen(&entry));

    }

}