/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/

#ifndef EXAMPLESLISTMODEL_H
#define EXAMPLESLISTMODEL_H

#include <QAbstractListModel>
#include <QSortFilterProxyModel>
#include <QStringList>
#include <QXmlStreamReader>

namespace QtSupport {
namespace Internal {

class QtVersionsModel;

enum ExampleRoles
{
    Name = Qt::UserRole, ProjectPath, Description, ImageUrl,
    DocUrl, FilesToOpen, Tags, Difficulty, HasSourceCode,
    Type, Dependencies, IsVideo, VideoUrl, VideoLength, Platforms,
    IsHighlighted
};

enum InstructionalType
{
    Example = 0, Demo, Tutorial
};

struct ExampleItem
{
    ExampleItem(): difficulty(0), isVideo(false), isHighlighted(false) {}
    QString name;
    QString projectPath;
    QString description;
    QString imageUrl;
    QString docUrl;
    QStringList filesToOpen;
    QStringList tags;
    QStringList dependencies;
    InstructionalType type;
    int difficulty;
    bool hasSourceCode;
    bool isVideo;
    bool isHighlighted;
    QString videoUrl;
    QString videoLength;
    QStringList platforms;
};

class ExamplesListModel : public QAbstractListModel
{
    Q_OBJECT

public:
    explicit ExamplesListModel(QObject *parent);

    int rowCount(const QModelIndex &parent = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

    QStringList tags() const;
    void ensureInitialized() const;

    void beginReset() { beginResetModel(); }
    void endReset() { endResetModel(); }

    void filterForQtById(int id);

signals:
    void tagsUpdated();
    void qtVersionsChanged();

public slots:
    void handleQtVersionsChanged();
    void updateExamples();
    void helpInitialized();

private:
    void parseExamples(QXmlStreamReader *reader, const QString &projectsOffset,
                                     const QString &examplesInstallPath);
    void parseDemos(QXmlStreamReader *reader, const QString &projectsOffset,
                                  const QString &demosInstallPath);
    void parseTutorials(QXmlStreamReader *reader, const QString &projectsOffset);
    QStringList exampleSources(QString *examplesInstallPath, QString *demosInstallPath,
                               QString *examplesFallback, QString *demosFallback,
                               QString *sourceFallback);

    QList<ExampleItem> m_exampleItems;
    QStringList m_tags;
    bool m_updateOnQtVersionsChanged;
    bool m_initialized;
    bool m_helpInitialized;
    int m_uniqueQtId;
};

class ExamplesListModelFilter : public QSortFilterProxyModel
{
    Q_OBJECT

public:
    Q_PROPERTY(bool showTutorialsOnly READ showTutorialsOnly WRITE setShowTutorialsOnly NOTIFY showTutorialsOnlyChanged)
    Q_PROPERTY(QStringList filterTags READ filterTags WRITE setFilterTags NOTIFY filterTagsChanged)
    Q_PROPERTY(QStringList searchStrings READ searchStrings WRITE setSearchStrings NOTIFY searchStrings)

    Q_PROPERTY(QAbstractItemModel* qtVersionModel READ qtVersionModel)
    Q_PROPERTY(int qtVersionIndex READ qtVersionIndex NOTIFY qtVersionIndexChanged)

    explicit ExamplesListModelFilter(ExamplesListModel *sourceModel, QObject *parent);

    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;

    bool showTutorialsOnly() { return m_showTutorialsOnly; }
    QStringList filterTags() const { return m_filterTags; }
    QStringList searchStrings() const { return m_searchString; }

    int rowCount(const QModelIndex &parent = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
    QAbstractItemModel* qtVersionModel();

    Q_INVOKABLE void filterForQtById(int id)
    {
        if (m_blockIndexUpdate)
            return;

        m_sourceModel->filterForQtById(id);
    }

public slots:
    void setFilterTags(const QStringList &arg)
    {
        if (m_filterTags != arg) {
            m_filterTags = arg;
            emit filterTagsChanged(arg);
        }
    }
    void updateFilter();

    void setSearchStrings(const QStringList &arg)
    {
        if (m_searchString != arg) {
            m_searchString = arg;
            emit searchStrings(arg);
            delayedUpdateFilter();
        }
    }

    void parseSearchString(const QString &arg);
    void setShowTutorialsOnly(bool showTutorialsOnly);
    void handleQtVersionsChanged();

signals:
    void showTutorialsOnlyChanged();
    void filterTagsChanged(const QStringList &arg);
    void searchStrings(const QStringList &arg);
    void qtVersionIndexChanged();

private:
    void timerEvent(QTimerEvent *event);
    void delayedUpdateFilter();
    int qtVersionIndex() const;

    bool m_showTutorialsOnly;
    QStringList m_filterTags;
    QStringList m_searchString;
    ExamplesListModel *m_sourceModel;
    int m_timerId;
    QtVersionsModel* m_qtVersionModel;
    bool m_blockIndexUpdate;
};

} // namespace Internal
} // namespace QtSupport

#endif // EXAMPLESLISTMODEL_H


