////////////////////////////////////////////////////////////////////////
//
// 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 <QAbstractButton>

#include "ButtonControl.h"
#include "ButtonGroup.h"
#include "Container.h"
#include "QtHandlesUtils.h"

#include "graphics.h"
#include "interpreter.h"

namespace QtHandles
{

  ButtonControl::ButtonControl (octave::base_qobject& oct_qobj,
                                octave::interpreter& interp,
                                const graphics_object& go,
                                QAbstractButton *btn)
    : BaseControl (oct_qobj, interp, go, btn), m_blockCallback (false)
  {
    uicontrol::properties& up = properties<uicontrol> ();

    QString str = Utils::fromStdString (up.get_string_string ());
    str.replace ("&", "&&");
    btn->setText (str);
    if (btn->isCheckable () || up.style_is ("togglebutton"))
      {
        btn->setCheckable (true);

        Matrix value = up.get_value ().matrix_value ();

        if (value.numel () > 0 && value(0) == up.get_max ())
          btn->setChecked (true);
      }

    connect (btn, &QAbstractButton::clicked, this, &ButtonControl::clicked);
    connect (btn, &QAbstractButton::toggled, this, &ButtonControl::toggled);
  }

  ButtonControl::~ButtonControl (void)
  { }

  void
  ButtonControl::update (int pId)
  {
    uicontrol::properties& up = properties<uicontrol> ();
    QAbstractButton *btn = qWidget<QAbstractButton> ();

    switch (pId)
      {
      case uicontrol::properties::ID_STRING:
        {
          QString str = Utils::fromStdString (up.get_string_string ());
          str.replace ("&", "&&");
          btn->setText (str);
          break;
        }

      case uicontrol::properties::ID_VALUE:
        m_blockCallback = true;
        if (btn->isCheckable ())
          {
            Matrix value = up.get_value ().matrix_value ();

            if (value.numel () > 0)
              {
                double dValue = value(0);

                if (dValue != 0.0 && dValue != 1.0)
                  warning ("button value not within valid display range");
                else if (dValue == up.get_min () && btn->isChecked ())
                  {
                    btn->setChecked (false);
                    if (up.style_is ("radiobutton") || up.style_is ("togglebutton"))
                      {
                        gh_manager& gh_mgr = m_interpreter.get_gh_manager ();

                        Object *parent = Object::parentObject (m_interpreter, gh_mgr.get_object (up.get___myhandle__ ()));
                        ButtonGroup *btnGroup = dynamic_cast<ButtonGroup *>(parent);
                        if (btnGroup)
                          btnGroup->selectNothing ();
                      }
                  }
                else if (dValue == up.get_max () && ! btn->isChecked ())
                  btn->setChecked (true);
              }
          }
        m_blockCallback = false;
        break;

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

  void
  ButtonControl::toggled (bool checked)
  {
    QAbstractButton *btn = qWidget<QAbstractButton> ();

    if (! m_blockCallback && btn->isCheckable ())
      {
        gh_manager& gh_mgr = m_interpreter.get_gh_manager ();

        octave::autolock guard (gh_mgr.graphics_lock ());

        uicontrol::properties& up = properties<uicontrol> ();

        Matrix oldValue = up.get_value ().matrix_value ();
        double newValue = (checked ? up.get_max () : up.get_min ());

        if (oldValue.numel () != 1 || (newValue != oldValue(0)))
          emit gh_set_event (m_handle, "value", newValue, false);
        emit gh_callback_event (m_handle, "callback");
      }
  }

  void
  ButtonControl::clicked (void)
  {
    QAbstractButton *btn = qWidget<QAbstractButton> ();

    if (! btn->isCheckable ())
      emit gh_callback_event (m_handle, "callback");
  }

};