/* GCompris - ActivityInfoTree.h
 *
 * Copyright (C) 2014 Bruno Coudoin <bruno.coudoin@gcompris.net>
 *
 * Authors:
 *   Bruno Coudoin <bruno.coudoin@gcompris.net>
 *
 *   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 3 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef ACTIVITYINFOTREE_H
#define ACTIVITYINFOTREE_H

#include "ActivityInfo.h"
#include <QQmlEngine>
#include <QDir>

class ActivityInfoTree : public QObject
{
    Q_OBJECT
    Q_PROPERTY(ActivityInfo* rootMenu READ getRootMenu CONSTANT)
    Q_PROPERTY(QQmlListProperty<ActivityInfo> menuTree READ menuTree NOTIFY menuTreeChanged)
    Q_PROPERTY(ActivityInfo* currentActivity READ getCurrentActivity WRITE setCurrentActivity NOTIFY currentActivityChanged)
    Q_PROPERTY(QVariantList characters READ allCharacters CONSTANT)

public:
    explicit ActivityInfoTree(QObject *parent = 0);
    QQmlListProperty<ActivityInfo> menuTree();
    ActivityInfo *getRootMenu() const;
    void setRootMenu(ActivityInfo *rootMenu);
    ActivityInfo *menuTree(int) const;
    void setCurrentActivity(ActivityInfo *currentActivity);
    ActivityInfo *getCurrentActivity() const;
    ActivityInfo *getParentActivity(ActivityInfo *root, ActivityInfo *menu);
    void menuTreeAppend(ActivityInfo *menu);
    void menuTreeAppend(QQmlEngine *engine,
                        const QDir &menuDir, const QString &menuFile);
    void sortByDifficulty(bool emitChanged = true);
    void sortByName(bool emitChanged = true);
    QVariantList allCharacters();

protected Q_SLOTS:
    Q_INVOKABLE void filterByTag(const QString &tag, bool emitChanged = true);
    Q_INVOKABLE void filterLockedActivities(bool emitChanged = true);
    Q_INVOKABLE void filterEnabledActivities(bool emitChanged = true);
    // create a tree from the whole list of activities with the activities created between the two versions
    Q_INVOKABLE void filterCreatedWithinVersions(int firstVersion, int lastVersion,
                                                 bool emitChanged = true);
    Q_INVOKABLE void filterBySearch(const QString& text);
    Q_INVOKABLE void filterByDifficulty(int levelMin, int levelMax);

signals:
    void menuTreeChanged();
    void currentActivityChanged();
    void allCharactersChanged();

private:
    // this is the full activity list, it never changes
    QList<ActivityInfo *> m_menuTreeFull;
    // represents the Menu view and can be filtered
    QList<ActivityInfo *> m_menuTree;
    ActivityInfo *m_rootMenu;
    ActivityInfo *m_currentActivity;
    QVariantList m_keyboardCharacters;
    static int menuTreeCount(QQmlListProperty<ActivityInfo> *property);
    static ActivityInfo *menuTreeAt(QQmlListProperty<ActivityInfo> *property, int index);

    struct SortByDifficulty
    {
        bool operator()(const ActivityInfo *a, const ActivityInfo *b) const
        {
            return a->difficulty() < b->difficulty();
        }
    };

	struct SortByName
	{
            bool operator()(const ActivityInfo *a, const ActivityInfo *b) const
            {
                return a->name() < b->name();
            }
	};

public:
    static void init();
    static QObject *menuTreeProvider(QQmlEngine *engine, QJSEngine *scriptEngine);
    void exportAsSQL();
};

#endif // ACTIVITYINFOTREE_H