////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2018-2022 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave 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.
//
// Octave 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 Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_documentation_bookmarks_h)
#define octave_documentation_bookmarks_h 1

#include <QCheckBox>
#include <QComboBox>
#include <QFile>
#include <QTreeWidget>
#include <QXmlStreamWriter>

#include "documentation.h"

namespace octave
{
  class documentation;

  class documentation_bookmarks : public QWidget
  {
    Q_OBJECT

  public:

    documentation_bookmarks (documentation *doc,
                             documentation_browser *browser,
                             QWidget *p = nullptr);

    ~documentation_bookmarks (void) = default;

  public slots:

    void add_bookmark (void);
    void add_folder (bool);
    void save_settings (void);

  private slots:

    void filter_bookmarks (const QString& pattern);
    void filter_activate (bool state);
    void update_filter_history (void);
    void handle_double_click (QTreeWidgetItem *item, int col = 0);
    void ctx_menu (const QPoint& xpos);
    void open (bool);
    void edit (bool);
    void remove (bool);
    void show_filter (bool);

  private:

    enum item_role
    {
      url_role = Qt::UserRole,
      tag_role = Qt::UserRole + 1
    };
    enum item_tag
    {
      bookmark_tag,
      folder_tag
    };

    void add_bookmark (const QString& title, const QString& url,
                       QTreeWidgetItem *item = nullptr);
    QTreeWidgetItem* add_folder (const QString& folder,
                                 QTreeWidgetItem *item = nullptr,
                                 bool expanded = true);

    /*!
        Writing to and reading bookmarks from an xbel-file as
        proposed in the qt example
        [QXmlStream Bookmarks Example](https://doc.qt.io/qt-5/qtxml-streambookmarks-example.html)
    */
    void write_bookmarks (void);
    void write_tree_item (QXmlStreamWriter *xml_writer,
                          const QTreeWidgetItem *item);
    QString read_bookmarks (void);
    void read_next_item (QXmlStreamReader *xml_writer, item_tag tag,
                         QTreeWidgetItem *item = nullptr);

    documentation *m_doc;
    documentation_browser *m_browser;

    QComboBox *m_filter;
    QTreeWidget *m_tree;

    QTreeWidgetItem *m_ctx_menu_item;

    QIcon icon_folder;
    QIcon icon_bookmark;

    QWidget *m_filter_widget;
    QCheckBox *m_filter_checkbox;
    bool m_filter_shown;

    QFile m_xbel_file;
  };

}

#endif