////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2022 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 (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QScrollBar>

#include "Container.h"
#include "SliderControl.h"
#include "QtHandlesUtils.h"

#include "octave-qobject.h"

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

#define RANGE_INT_MAX 1000000

OCTAVE_BEGIN_NAMESPACE(octave)

SliderControl *
SliderControl::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 SliderControl (oct_qobj, interp, go,
                                  new QScrollBar (container));
    }

  return nullptr;
}

SliderControl::SliderControl (octave::base_qobject& oct_qobj,
                              octave::interpreter& interp,
                              const graphics_object& go,
                              QAbstractSlider *slider)
  : BaseControl (oct_qobj, interp, go, slider), m_blockUpdates (false)
{
  uicontrol::properties& up = properties<uicontrol> ();

  slider->setTracking (false);
  Matrix bb = up.get_boundingbox ();
  bool vertical_slider = ( bb(2) < bb(3) );
  slider->setOrientation (vertical_slider ? Qt::Vertical : Qt::Horizontal);
  if (vertical_slider)
    slider->setInvertedAppearance (true);  // Matlab compatibility
  Matrix steps = up.get_sliderstep ().matrix_value ();
  slider->setMinimum (0);
  slider->setMaximum (RANGE_INT_MAX);
  slider->setSingleStep (octave::math::round (steps(0) * RANGE_INT_MAX));
  slider->setPageStep (octave::math::round (steps(1) * RANGE_INT_MAX));
  Matrix value = up.get_value ().matrix_value ();
  if (value.numel () > 0)
    {
      double dmin = up.get_min (), dmax = up.get_max ();

      slider->setValue (octave::math::round (((value(0) - dmin) / (dmax - dmin))
                                             * RANGE_INT_MAX));
    }

  connect (slider, &QAbstractSlider::valueChanged,
           this, &SliderControl::valueChanged);
}

SliderControl::~SliderControl (void)
{ }

void
SliderControl::update (int pId)
{
  uicontrol::properties& up = properties<uicontrol> ();
  QScrollBar *slider = qWidget<QScrollBar> ();

  switch (pId)
    {
    case uicontrol::properties::ID_SLIDERSTEP:
      {
        Matrix steps = up.get_sliderstep ().matrix_value ();

        slider->setSingleStep (octave::math::round (steps(0) * RANGE_INT_MAX));
        slider->setPageStep (octave::math::round (steps(1) * RANGE_INT_MAX));
      }
      break;

    case uicontrol::properties::ID_VALUE:
      {
        Matrix value = up.get_value ().matrix_value ();
        double dmax = up.get_max (), dmin = up.get_min ();

        if (value.numel () > 0)
          {
            int ival = octave::math::round (((value(0) - dmin) / (dmax - dmin))
                                            * RANGE_INT_MAX);

            m_blockUpdates = true;
            slider->setValue (ival);
            m_blockUpdates = false;
          }
      }
      break;

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

void
SliderControl::valueChanged (int ival)
{
  if (! m_blockUpdates)
    {
      gh_manager& gh_mgr = m_interpreter.get_gh_manager ();

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

      graphics_object go = object ();

      if (go.valid_object ())
        {
          uicontrol::properties& up = Utils::properties<uicontrol> (go);

          Matrix value = up.get_value ().matrix_value ();
          double dmin = up.get_min (), dmax = up.get_max ();

          int ival_tmp = (value.numel () > 0 ?
                          octave::math::round (((value(0) - dmin) / (dmax - dmin))
                                               * RANGE_INT_MAX) :
                          0);

          if (ival != ival_tmp || value.numel () > 0)
            {
              double dval = dmin + (ival * (dmax - dmin) / RANGE_INT_MAX);

              emit gh_set_event (m_handle, "value", octave_value (dval));
              emit gh_callback_event (m_handle, "callback");
            }
        }
    }
}

OCTAVE_END_NAMESPACE(octave)