/* This file is part of the KDE project
   Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
   Copyright     2007       David Faure <faure@kde.org>

   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 __ko_query_trader_h__
#define __ko_query_trader_h__

#include <kservice.h>
#include <ksharedptr.h>
#include <QtCore/QList>
#include "komain_export.h"

class QObject;
class QStringList;
class KoDocument;
class KoFilter;
class KoFilterChain;

/**
 *  Represents an available KOffice component
 *  that supports the document interface.
 */
class KOMAIN_EXPORT KoDocumentEntry
{

public:
    /**
     * Represents an invalid entry (as returned by queryByMimeType for instance)
     */
    explicit KoDocumentEntry();
    /**
     * Represents a valid entry
     */
    explicit KoDocumentEntry(const KService::Ptr& service);
    ~KoDocumentEntry();

    KService::Ptr service() const {
        return m_service;
    }

    /**
     * @return TRUE if the service pointer is null
     */
    bool isEmpty() const {
        return m_service.isNull();
    }

    /**
     * @return name of the associated service
     */
    QString name() const {
        return m_service->name();
    }

    /**
     *  Mimetypes (and other service types) which this document can handle.
     */
    QStringList mimeTypes() const {
        return m_service->serviceTypes();
    }

    /**
     *  @return TRUE if the document can handle the requested mimetype.
     */
    bool supportsMimeType(const QString & _mimetype) const {
        return mimeTypes().contains(_mimetype);
    }

    /**
     *  Uses the factory of the component to create
     *  a document. If that is not possible, 0 is returned.
     */
    KoDocument* createDoc(QString* errorMsg = 0, KoDocument* parent = 0) const;

    enum QueryFlag {
        AllEntries = 0,
        /**
         * OnlyEmbeddableDocuments specifies if only KOffice Parts should be
         * listed which are embeddable into other koDocuments, or all (if false)
         * (eg.: it makes no sense to embed Kexi into KWord,
         *  but it makes sense to embed it into KoShell)
         */
        OnlyEmbeddableDocuments = 1
        // bitfield
    };
    Q_DECLARE_FLAGS(QueryFlags, QueryFlag)

    /**
     *  This function will query ksycoca to find all available components.
     *  The result will only contain parts, which are embeddable into a document
     *
     *  @param _constr is a constraint expression as used by KTrader.
     *                 You can use it to set additional restrictions on the available
     *                 components.
     */
    static QList<KoDocumentEntry> query(QueryFlags flags, const QString &  _constr = QString());

    /**
     *  This is a convenience function.
     *
     *  @return a document entry for the KOffice component that supports
     *          the requested mimetype and fits the user best.
     */
    static KoDocumentEntry queryByMimeType(const QString & mimetype);

private:
    KService::Ptr m_service;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(KoDocumentEntry::QueryFlags)

/**
 *  Represents an available filter.
 */
class KOMAIN_EXPORT KoFilterEntry : public KShared
{

public:
    typedef KSharedPtr<KoFilterEntry> Ptr;

    //KoFilterEntry() : weight( 0 ) { m_service = 0L; } // for QList
    explicit KoFilterEntry(const KService::Ptr& service);
    ~KoFilterEntry() { }

    KoFilter* createFilter(KoFilterChain* chain, QObject* parent = 0);

    /**
     *  The imported mimetype(s).
     */
    QStringList import;

    /**
     *  The exported mimetype(s).
     */
    QStringList export_;

    /**
     *  The "weight" of this filter path. Has to be > 0 to be valid.
     */
    unsigned int weight;

    /**
     *  Do we have to check during runtime?
     */
    QString available;

    /**
     *  @return TRUE if the filter can import the requested mimetype.
     */
    bool imports(const QString& _mimetype) const {
        return (import.contains(_mimetype));
    }

    /**
     *  @return TRUE if the filter can export the requested mimetype.
     */
    bool exports(const QString& _m) const {
        return (export_.contains(_m));
    }

    /**
     *  This function will query KDED to find all available filters.
     *
     *  @param _constr is a constraint expression as used by KDEDs trader interface.
     *                 You can use it to set additional restrictions on the available
     *                 components.
     */
    static QList<KoFilterEntry::Ptr> query(const QString& _constr = QString());

    KService::Ptr service() const {
        return m_service;
    }

private:
    KService::Ptr m_service;
};

#endif
