/*
    Copyright (C) 2008 Omat Holding B.V. <info@omat.nl>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    This library is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#ifndef __NEPOMUKTAG_RESOURCE_H__
#define __NEPOMUKTAG_RESOURCE_H__

#include <akonadi/resourcebase.h>
#include <soprano/statement.h>

#include <QTimer>
#include <QScopedPointer>

namespace Nepomuk2 {
class Tag;
}

namespace Soprano {
  namespace Util {
    class SignalCacheModel;
  }
}

class NepomukTagResource : public Akonadi::ResourceBase, public Akonadi::AgentBase::ObserverV2
{
    Q_OBJECT
    Q_CLASSINFO( "D-Bus Interface", "org.kde.Akonadi.NepomukTag.Resource" )

public:
    NepomukTagResource( const QString &id );
    ~NepomukTagResource();

public Q_SLOTS:
    void configure( WId windowId );

protected Q_SLOTS:
    virtual void retrieveCollections();
    virtual void retrieveItems( const Akonadi::Collection &col );
    virtual bool retrieveItem( const Akonadi::Item &, const QSet<QByteArray> & ) { return true; };


protected:
    virtual void itemLinked( const Akonadi::Item &item, const Akonadi::Collection &collection );
    virtual void itemUnlinked( const Akonadi::Item& item, const Akonadi::Collection& collection );
    virtual void collectionAdded( const Akonadi::Collection &collection, const Akonadi::Collection &parent );
    virtual void collectionChanged(const Akonadi::Collection& collection, const QSet< QByteArray >& partIdentifiers);
    // do not hide the other variant, use implementation from base class
    // which just forwards to the one above
    using Akonadi::AgentBase::ObserverV2::collectionChanged;
    virtual void collectionRemoved( const Akonadi::Collection& collection );

  private:
    Akonadi::Collection collectionFromTag( const Nepomuk2::Tag &tag );

  private Q_SLOTS:
    void slotLocalListResult( KJob* job );
    void slotLinkResult( KJob* job );

    void statementAdded( const Soprano::Statement &statement );
    void statementRemoved( const Soprano::Statement &statement );

    void createPendingTagCollections();

    void linkDone( KJob* );
    void unlinkDone( KJob* );

  private:
    Akonadi::Collection m_root;
    QList<QUrl> m_pendingTagUris;
    QTimer m_pendingTagsTimer;
    QScopedPointer<Soprano::Util::SignalCacheModel> mModel;
};

#endif
