////////////////////////////////////////////////////////////////////////
//
// 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/>.
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////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QComboBox>

#include "Container.h"
#include "PopupMenuControl.h"
#include "QtHandlesUtils.h"

#include "octave-qobject.h"
#include "octave-qtutils.h"

namespace octave
{

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

    if (parent)
      {
        Container *container = parent->innerContainer ();

        if (container)
          return new PopupMenuControl (oct_qobj, interp, go,
                                       new QComboBox (container));
      }

    return nullptr;
  }

  PopupMenuControl::PopupMenuControl (octave::base_qobject& oct_qobj,
                                      octave::interpreter& interp,
                                      const graphics_object& go,
                                      QComboBox *box)
    : BaseControl (oct_qobj, interp, go, box), m_blockUpdate (false)
  {
    uicontrol::properties& up = properties<uicontrol> ();

    box->addItems (Utils::fromStdString (up.get_string_string ()).split ('|'));

    update (uicontrol::properties::ID_VALUE);

    connect (box, QOverload<int>::of (&QComboBox::activated),
             this, &PopupMenuControl::currentIndexChanged);
  }

  PopupMenuControl::~PopupMenuControl (void)
  { }

  void PopupMenuControl::update (int pId)
  {
    uicontrol::properties& up = properties<uicontrol> ();
    QComboBox *box = qWidget<QComboBox> ();

    switch (pId)
      {
      case uicontrol::properties::ID_STRING:
        m_blockUpdate = true;
        {
          int oldCurrent = box->currentIndex ();

          box->clear ();
          box->addItems (Utils::fromStdString
                         (up.get_string_string ()).split ('|'));
          if (box->count () > 0
              && oldCurrent >= 0
              && oldCurrent < box->count ())
            {
              box->setCurrentIndex (oldCurrent);
            }
          else
            {
              emit gh_set_event (m_handle, "value",
                                 octave_value (box->count () > 0 ? 1.0 : 0.0),
                                 false);
            }
        }
        m_blockUpdate = false;
        break;

      case uicontrol::properties::ID_VALUE:
        m_blockUpdate = true;
        {
          Matrix value = up.get_value ().matrix_value ();

          if (value.numel () > 0)
            {
              if (value(0) != static_cast<int> (value(0)))
                warning ("popupmenu value should be integer");
              else
                {
                  int newIndex = int (value(0)) - 1;

                  if (newIndex >= 0 && newIndex < box->count ())
                    {
                      if (newIndex != box->currentIndex ())
                        box->setCurrentIndex (newIndex);
                    }
                  else
                    warning ("popupmenu value not within valid display range");
                }
            }
        }
        m_blockUpdate = false;
        break;

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

  void
  PopupMenuControl::currentIndexChanged (int index)
  {
    if (! m_blockUpdate)
      {
        emit gh_set_event (m_handle, "value", octave_value (double (index + 1)),
                           false);
        emit gh_callback_event (m_handle, "callback");
      }
  }

}