////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2021 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 (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QAction>
#include <QActionEvent>
#include <QApplication>
#include <QEvent>
#include <QIcon>
#include <QMainWindow>
#include <QPixmap>
#include <QTimer>
#include <QToolBar>

#include "Figure.h"
#include "ToolBar.h"
#include "QtHandlesUtils.h"

#include "gui-preferences-global.h"
#include "octave-qobject.h"

namespace QtHandles
{
  static QIcon makeEmptyIcon (void)
  {
    QPixmap pix (16, 16);

    pix.fill (Qt::transparent);

    return QIcon (pix);
  }

  static QAction*
  addEmptyAction (QToolBar *bar)
  {
    static const QIcon empty_icon = makeEmptyIcon ();

    QAction *a = bar->addAction (empty_icon, "Empty Toolbar");

    a->setEnabled (false);
    a->setToolTip ("");

    return a;
  }

  ToolBar*
  ToolBar::create (octave::base_qobject& oct_qobj, octave::interpreter& interp,
                   const graphics_object& go)
  {
    Object *parent = parentObject (interp, go);

    if (parent)
      {
        QWidget *parentWidget = parent->qWidget<QWidget> ();

        if (parentWidget)
          return new ToolBar (oct_qobj, interp, go,
                              new QToolBar (parentWidget));
      }

    return nullptr;
  }

  ToolBar::ToolBar (octave::base_qobject& oct_qobj, octave::interpreter& interp,
                    const graphics_object& go, QToolBar *bar)
    : Object (oct_qobj, interp, go, bar), m_empty (nullptr), m_figure (nullptr)
  {
    uitoolbar::properties& tp = properties<uitoolbar> ();

    bar->setFloatable (false);
    bar->setMovable (false);
    bar->setVisible (tp.is_visible ());
    bar->setStyleSheet (bar->styleSheet () + global_toolbar_style);


    m_empty = addEmptyAction (bar);

    m_figure =
      dynamic_cast<Figure *> (Object::fromQObject (bar->parentWidget ()));

    if (m_figure)
      m_figure->addCustomToolBar (bar, tp.is_visible (),
                                  tp.get_tag () == "__default_toolbar__");

    bar->installEventFilter (this);
  }

  ToolBar::~ToolBar (void)
  { }

  void
  ToolBar::update (int pId)
  {
    uitoolbar::properties& tp = properties<uitoolbar> ();
    QToolBar *bar = qWidget<QToolBar> ();

    switch (pId)
      {
      case base_properties::ID_VISIBLE:
        if (m_figure)
          m_figure->showCustomToolBar (bar, tp.is_visible ());
        break;

      default:
        Object::update (pId);
        break;
      }
  }

  bool
  ToolBar::eventFilter (QObject *watched, QEvent *xevent)
  {
    if (watched == qObject ())
      {
        switch (xevent->type ())
          {
          case QEvent::ActionAdded:
          case QEvent::ActionRemoved:
            {
              QActionEvent *ae = dynamic_cast<QActionEvent *> (xevent);
              QToolBar *bar = qWidget<QToolBar> ();

              if (ae->action () != m_empty)
                {
                  if (xevent->type () == QEvent::ActionAdded)
                    {
                      if (bar->actions ().size () == 2)
                        QTimer::singleShot (0, this, SLOT (hideEmpty (void)));
                    }
                  else
                    {
                      if (bar->actions ().size () == 1)
                        m_empty->setVisible (true);
                    }
                }
            }
            break;

          default:
            break;
          }
      }

    return false;
  }

  void
  ToolBar::hideEmpty (void)
  {
    m_empty->setVisible (false);
  }

  void
  ToolBar::beingDeleted (void)
  {
    if (m_figure)
      {
        QToolBar *bar = qWidget<QToolBar> ();

        if (bar)
          m_figure->showCustomToolBar (bar, false);
      }
  }

}
