////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2014-2022 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_shortcut_manager_h)
#define octave_shortcut_manager_h 1

#include <QKeyEvent>
#include <QLabel>
#include <QLineEdit>
#include <QShortcut>
#include <QTreeWidget>
#include <QWidget>

#include "gui-preferences.h"

OCTAVE_BEGIN_NAMESPACE(octave)

  class enter_shortcut : public QLineEdit
  {
    Q_OBJECT

  public:

    enter_shortcut (QWidget *p = nullptr);

    ~enter_shortcut (void) = default;

    virtual void keyPressEvent (QKeyEvent *e);

  public slots:

    void handle_direct_shortcut (int);
    void handle_shift_modifier (int);

  private:

    bool m_direct_shortcut;
    bool m_shift_modifier;

  };

  class gui_settings;

  class shortcut_manager : public QWidget
  {
    Q_OBJECT

  public:

    enum
    {
      OSC_IMPORT  = 0,
      OSC_EXPORT  = 1,
      OSC_DEFAULT = 2
    };

    shortcut_manager (void);

    // No copying!

    shortcut_manager (const shortcut_manager&) = delete;

    shortcut_manager& operator = (const shortcut_manager&) = delete;

    ~shortcut_manager (void) = default;

    void init_data (void);

    void write_shortcuts (gui_settings& settings, bool closing);

    void set_shortcut (QAction *action, const sc_pref& scpref, bool enable = true);

    void shortcut (QShortcut *sc, const sc_pref& scpref);

    void fill_treewidget (QTreeWidget *tree_view);

    bool import_export (int action);

  protected slots:

    void handle_double_clicked (QTreeWidgetItem *, int);
    void shortcut_dialog_finished (int);
    void shortcut_dialog_set_default ();

  private:

    void init (const QString&, const sc_pref& scpref);
    void shortcut_dialog (int);
    void import_shortcuts (gui_settings& settings);
    void reset_default_shortcuts (void);
    bool overwrite_all_shortcuts (void);

    class shortcut_t
    {
    public:

      shortcut_t (void)
        : m_tree_item (nullptr), m_description (), m_settings_key (),
          m_actual_sc (QKeySequence ()), m_default_sc (QKeySequence ())
      { }

      shortcut_t (const shortcut_t& x)
        : m_tree_item (x.m_tree_item), m_description (x.m_description),
          m_settings_key (x.m_settings_key)
      {
        m_actual_sc = x.m_actual_sc;
        m_default_sc = x.m_default_sc;
      }

      shortcut_t& operator = (const shortcut_t& x)
      {
        if (&x != this)
          {
            m_tree_item = x.m_tree_item;
            m_description = x.m_description;
            m_settings_key = x.m_settings_key;

            m_actual_sc = QKeySequence ();
            m_default_sc = QKeySequence ();

            m_actual_sc = x.m_actual_sc;
            m_default_sc = x.m_default_sc;
          }

        return *this;
      }

      ~shortcut_t (void) = default;

      QTreeWidgetItem *m_tree_item;
      QString m_description;
      QString m_settings_key;
      QKeySequence m_actual_sc;
      QKeySequence m_default_sc;
    };

    QList<shortcut_t> m_sc;
    QHash<QString, int> m_shortcut_hash;
    QHash<QString, int> m_action_hash;
    QHash <QString, QTreeWidgetItem *> m_level_hash;
    QHash<int, QTreeWidgetItem *> m_index_item_hash;
    QHash<QTreeWidgetItem *, int> m_item_index_hash;

    QDialog *m_dialog;
    enter_shortcut *m_edit_actual;
    QLabel *m_label_default;
    int m_handled_index;
  };

OCTAVE_END_NAMESPACE(octave)

#endif