/***************************************************************************
 *   This file is part of the KDE project                                  *
 *   Copyright 2007 Will Stephenson <wstephenson@kde.org>                  *
 *   Copyright (C) 2009 Ben Cooksley <bcooksley@kde.org>                   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA          *
 ***************************************************************************/

#ifndef MENUITEM_H
#define MENUITEM_H

#include "systemsettingsview_export.h"

#include <KService>

class QString;
class KCModuleInfo;
template<typename T> class QList;

/**
 * @brief Provides a specific item in the list of modules or categories
 *
 * This provides convenient access to the list of modules, providing information about them
 * such as name, module information and its service object.\n
 * This is created automatically by System Settings, and is shared among all plugins and so should not
 * be modified under any circumstances.\n
 *
 * System Settings creates it in a tree like manner, with categories containing subcategories and modules,
 * and subcategories repeating this.\n
 *
 * The service object must be set, unless it is the top level item, otherwise using applications
 * will crash when attempting to sort the children by weight
 *
 * @author Ben Cooksley <bcooksley@kde.org>
 * @author Will Stephenson <wstephenson@kde.org>
 */
class SYSTEMSETTINGSVIEW_EXPORT MenuItem
{
public:
    /**
     * Creates a MenuItem.
     * @note Will not provide keywords, name, or a module item until a service has been set.
     *
     * @param isMenu Specifies if it is a category or not.
     * @param parent The item it is parented to. Provide 0 for a top level item.
     */
    MenuItem( bool isMenu, MenuItem * parent );

    /**
     * Destroys a MenuItem, including all children, the service object and the module information.
     *
     * @warning Destroys the KService and KCModuleInfo objects provided by service() and item().
     */
    ~MenuItem();

    /**
     * Sorts the children depending on the value of "X-KDE-Weight" in the desktop files of the
     * category or module.
     */
    void sortChildrenByWeight();

    /**
     * Provides the MenuItem for the child at the specified index.
     *
     * @param index The index of the child.
     * @returns The MenuItem object of the specified child.
     */
    MenuItem * child( int index );

    /**
     * Returns the list of keywords, which is used for searching the list of categories and modules.
     *
     * @note The parent items share all the keywords of their children.
     * @returns The list of keywords the item has.
     */
    QStringList keywords();

    /**
     * Returns the parent of this item.
     *
     * @returns The MenuItem object of this items parent.
     */
    MenuItem *parent() const;

    /**
     * Provides a list of all the children of this item.
     *
     * @returns The list of children this has.
     */
    QList<MenuItem*>& children() const;

    /**
     * Returns the service object of this item, which contains useful information about it.
     *
     * @returns The service object of this item if it has been set.
     */
    KService::Ptr& service() const;

    /**
     * Provides the KDE control module information item, which can be used to load control modules
     * by the ModuleView.
     *
     * @returns The control module information object of the item, if the service object has been set.
     */
    KCModuleInfo& item() const;

    /**
     * Convenience function which provides the name of the current item.
     *
     * @returns The name of the item, if the service object has been set.
     */
    QString& name() const;

    /**
     * Convenience function which provides the System Settings category of the current item.
     *
     * @returns The category of the item, if the service object has been set.
     */
    QString& category() const;

    /**
     * Provides the weight of the current item, as determined by its service.
     * If the service does not specify a weight, it is 100
     *
     * @returns The weight of the service
     */
    int weight();

    /**
     * Provides information on which type the current item is.
     *
     * @returns true if it is a category.
     * @returns false if it is not a category.
     */
    bool menu() const;

    /**
     * Sets the service object, which is used to provide the module information, name and keywords
     * Applications will crash if it is not set, unless it is the top level item.
     *
     * @param service The service object to store.
     */
    void setService( const KService::Ptr& service );

    MenuItem *descendantForModule(const QString &moduleName);

private:
    class Private;
    Private *const d;
};

Q_DECLARE_METATYPE( MenuItem * )

#endif
