/*=========================================================================

   Program: ParaView
   Module:  pqOMETransferFunctionsPropertyWidget.cxx

   Copyright (c) 2005,2006 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2.

   See License_v1.2.txt for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

========================================================================*/
#include "pqOMETransferFunctionsPropertyWidget.h"
#include "ui_pqOMETransferFunctionsPropertyWidget.h"
#include "ui_pqOMETransferFunctionsPropertyWidgetPage.h"

#include "pqCoreUtilities.h"
#include "pqPresetDialog.h"
#include "pqProxyWidget.h"
#include "pqResetScalarRangeReaction.h"
#include "vtkCommand.h"
#include "vtkDiscretizableColorTransferFunction.h"
#include "vtkPiecewiseFunction.h"
#include "vtkSMPropertyGroup.h"
#include "vtkSMTransferFunctionProxy.h"
#include "vtkSMUncheckedPropertyHelper.h"

#include <QPointer>
#include <QScopedValueRollback>
#include <QVBoxLayout>
#include <QVector>
#include <cassert>
#include <set>
#include <string>

class pqOMETransferFunctionsPropertyWidget::pqInternals
{
public:
  Ui::OMETransferFunctionsPropertyWidget Ui;
  QVector<QPointer<QWidget> > Pages;
  vtkWeakPointer<vtkSMPropertyGroup> Group;
};

//-----------------------------------------------------------------------------
pqOMETransferFunctionsPropertyWidget::pqOMETransferFunctionsPropertyWidget(
  vtkSMProxy* smproxy, vtkSMPropertyGroup* smgroup, QWidget* parentObject)
  : Superclass(smproxy, parentObject)
  , Internals(new pqOMETransferFunctionsPropertyWidget::pqInternals())
{
  this->setChangeAvailableAsChangeFinished(true);

  auto& internals = (*this->Internals);
  internals.Group = smgroup;
  internals.Ui.setupUi(this);

  for (int idx = 0; idx < 10; ++idx)
  {
    const QString function = QString("Channel_%1").arg(idx + 1);
    vtkSMPropertyHelper helper(smgroup->GetProperty(function.toUtf8().data()));
    if (auto lut = helper.GetAsProxy())
    {
      QWidget* page = new QWidget(this);
      Ui::OMETransferFunctionsPropertyWidgetPage pageUi;
      pageUi.setupUi(page);

      QObject::connect(pageUi.InvertTransferFunctions, &QToolButton::clicked,
        [lut]() { vtkSMTransferFunctionProxy::InvertTransferFunction(lut); });

      QObject::connect(pageUi.ChoosePreset, &QToolButton::clicked, [this, lut]() {
        (void)this;
        vtkSMProxy* sof = vtkSMPropertyHelper(lut, "ScalarOpacityFunction", true).GetAsProxy();
        bool indexedLookup = vtkSMPropertyHelper(lut, "IndexedLookup", true).GetAsInt() != 0;
        pqPresetDialog dialog(pqCoreUtilities::mainWidget(), indexedLookup
            ? pqPresetDialog::SHOW_INDEXED_COLORS_ONLY
            : pqPresetDialog::SHOW_NON_INDEXED_COLORS_ONLY);
        dialog.setCustomizableLoadColors(!indexedLookup);
        dialog.setCustomizableLoadOpacities(sof != nullptr);
        dialog.setCustomizableUsePresetRange(false);
        dialog.setCustomizableLoadAnnotations(false);
        QObject::connect(
          &dialog, &pqPresetDialog::applyPreset, [lut, sof, &dialog](const Json::Value&) {
            if (dialog.loadColors())
            {
              vtkSMTransferFunctionProxy::ApplyPreset(lut, dialog.currentPreset());
            }
            if (dialog.loadOpacities() && sof != nullptr)
            {
              vtkSMTransferFunctionProxy::ApplyPreset(sof, dialog.currentPreset());
            }
          });
        dialog.exec();
      });

      auto stc = vtkDiscretizableColorTransferFunction::SafeDownCast(lut->GetClientSideObject());
      pageUi.ColorEditor->initialize(stc, true, nullptr, false);
      pageUi.ColorEditor->setProperty("SM_PROPERTY", QString("RGBPoints;%1").arg(idx));

      auto pwf = stc ? stc->GetScalarOpacityFunction() : nullptr;
      pageUi.OpacityEditor->initialize(stc, false, pwf, true);
      pageUi.OpacityEditor->setProperty("SM_PROPERTY", QString("Points;%1").arg(idx));

      this->connect(pageUi.ColorEditor, SIGNAL(controlPointsModified()), SLOT(stcChanged()));
      this->connect(pageUi.ColorEditor, SIGNAL(chartRangeModified()), SLOT(stcChanged()));
      this->connect(pageUi.OpacityEditor, SIGNAL(controlPointsModified()), SLOT(pwfChanged()));
      this->connect(pageUi.OpacityEditor, SIGNAL(chartRangeModified()), SLOT(pwfChanged()));

      page->setObjectName(function);
      page->hide();
      internals.Pages.push_back(page);

      this->addPropertyLink(this, QString("RGBPoints;%1").arg(idx).toUtf8().data(),
        SIGNAL(xrgbPointsChanged()), lut, lut->GetProperty("RGBPoints"));

      auto sof = vtkSMPropertyHelper(lut, "ScalarOpacityFunction").GetAsProxy();
      this->addPropertyLink(this, QString("Points;%1").arg(idx).toUtf8().data(),
        SIGNAL(xvmsPointsChanged()), sof, sof->GetProperty("Points"));

      // hookup weight.
      if (auto weigthProp = smgroup->GetProperty(QString("%1Weight").arg(function).toUtf8().data()))
      {
        this->addPropertyLink(
          pageUi.Weight, "value", SIGNAL(valueChanged(double)), smproxy, weigthProp);
      }

      auto lutWidget = pageUi.ColorEditor;
      auto sofWidget = pageUi.OpacityEditor;
      auto callback = [lut, sof, lutWidget, sofWidget, this](double rmin, double rmax) {
        double range[2] = { rmin, rmax };
        vtkSMTransferFunctionProxy::RescaleTransferFunction(lut, range);
        vtkSMTransferFunctionProxy::RescaleTransferFunction(sof, range);
        this->stcChanged(lutWidget);
        this->pwfChanged(sofWidget);
      };

      QObject::connect(
        pageUi.ColorEditor, &pqTransferFunctionWidget::rangeHandlesRangeChanged, callback);
      QObject::connect(
        pageUi.OpacityEditor, &pqTransferFunctionWidget::rangeHandlesRangeChanged, callback);

      auto callback2 = [lut, lutWidget, sofWidget, this]() {
        if (pqResetScalarRangeReaction::resetScalarRangeToCustom(lut))
        {
          this->stcChanged(lutWidget);
          this->pwfChanged(sofWidget);
        }
      };

      QObject::connect(
        pageUi.ColorEditor, &pqTransferFunctionWidget::rangeHandlesDoubleClicked, callback2);
      QObject::connect(
        pageUi.OpacityEditor, &pqTransferFunctionWidget::rangeHandlesDoubleClicked, callback2);
    }
  }

  auto cvprop = smproxy->GetProperty("ChannelVisibilities");
  assert(cvprop != nullptr);
  pqCoreUtilities::connect(
    cvprop, vtkCommand::UncheckedPropertyModifiedEvent, this, SLOT(channelVisibilitiesChanged()));
  this->channelVisibilitiesChanged();
}

//-----------------------------------------------------------------------------
pqOMETransferFunctionsPropertyWidget::~pqOMETransferFunctionsPropertyWidget()
{
  auto& internals = (*this->Internals);
  for (const auto& page : internals.Pages)
  {
    delete page;
  }
}

//-----------------------------------------------------------------------------
void pqOMETransferFunctionsPropertyWidget::channelVisibilitiesChanged()
{
  auto& internals = (*this->Internals);
  auto smproxy = this->proxy();
  assert(smproxy != nullptr);
  vtkSMUncheckedPropertyHelper helper(smproxy, "ChannelVisibilities");

  std::set<std::string> values;
  for (unsigned int cc = 0; cc < helper.GetNumberOfElements(); ++cc)
  {
    values.insert(helper.GetAsString(cc));
  }

  internals.Ui.tabWidget->clear();
  for (const auto& page : internals.Pages)
  {
    if (values.find(page->objectName().toUtf8().toStdString()) != values.end())
    {
      internals.Ui.tabWidget->addTab(page, page->objectName());
      page->show();
    }
    else
    {
      page->hide();
    }
  }
}

//-----------------------------------------------------------------------------
void pqOMETransferFunctionsPropertyWidget::stcChanged(pqTransferFunctionWidget* tfWidget)
{
  tfWidget = tfWidget ? tfWidget : qobject_cast<pqTransferFunctionWidget*>(this->sender());
  assert(tfWidget);
  auto stc = vtkDiscretizableColorTransferFunction::SafeDownCast(tfWidget->scalarsToColors());

  QList<QVariant> values;
  for (int cc = 0; stc != nullptr && cc < stc->GetSize(); cc++)
  {
    double xrgbms[6];
    stc->GetNodeValue(cc, xrgbms);
    values.push_back(xrgbms[0]);
    values.push_back(xrgbms[1]);
    values.push_back(xrgbms[2]);
    values.push_back(xrgbms[3]);
  }

  QScopedValueRollback<bool> rollback(this->UpdatingProperty, true);
  auto pname = tfWidget->property("SM_PROPERTY").toString();
  this->setProperty(pname.toUtf8().data(), values);
  Q_EMIT this->xrgbPointsChanged();
}

//-----------------------------------------------------------------------------
void pqOMETransferFunctionsPropertyWidget::pwfChanged(pqTransferFunctionWidget* tfWidget)
{
  tfWidget = tfWidget ? tfWidget : qobject_cast<pqTransferFunctionWidget*>(this->sender());
  assert(tfWidget);
  auto pwf = tfWidget->piecewiseFunction();

  QList<QVariant> values;
  for (int cc = 0; pwf != nullptr && cc < pwf->GetSize(); cc++)
  {
    double xvms[4];
    pwf->GetNodeValue(cc, xvms);
    values.push_back(xvms[0]);
    values.push_back(xvms[1]);
    values.push_back(xvms[2]);
    values.push_back(xvms[3]);
  }
  QScopedValueRollback<bool> rollback(this->UpdatingProperty, true);
  auto pname = tfWidget->property("SM_PROPERTY").toString();
  this->setProperty(pname.toUtf8().data(), values);
  Q_EMIT this->xvmsPointsChanged();
}

//-----------------------------------------------------------------------------
bool pqOMETransferFunctionsPropertyWidget::event(QEvent* evt)
{
  if (!this->UpdatingProperty && evt->type() == QEvent::DynamicPropertyChange)
  {
    auto devt = dynamic_cast<QDynamicPropertyChangeEvent*>(evt);
    const auto pname = QString(devt->propertyName());
    const auto parts = pname.split(';');
    assert(parts.size() == 2);

    if (parts[0] == "RGBPoints")
    {
      this->setXrgbPoints(
        parts[1].toInt(), this->property(pname.toUtf8().data()).value<QList<QVariant> >());
    }
    else
    {
      assert(parts[0] == "Points");
      this->setXvmsPoints(
        parts[1].toInt(), this->property(pname.toUtf8().data()).value<QList<QVariant> >());
    }
  }

  return this->Superclass::event(evt);
}

//-----------------------------------------------------------------------------
void pqOMETransferFunctionsPropertyWidget::setXvmsPoints(int index, const QList<QVariant>& xvms)
{
  auto& internals = (*this->Internals);
  auto smgroup = internals.Group.GetPointer();
  assert(index < static_cast<int>(smgroup->GetNumberOfProperties()));

  auto lut = vtkSMPropertyHelper(smgroup->GetProperty(index)).GetAsProxy();
  auto pwf = vtkDiscretizableColorTransferFunction::SafeDownCast(lut->GetClientSideObject())
               ->GetScalarOpacityFunction();

  pwf->RemoveAllPoints();
  for (int cc = 0; (cc + 3) < xvms.size(); cc += 4)
  {
    pwf->AddPoint(xvms[cc].toDouble(), xvms[cc + 1].toDouble(), xvms[cc + 2].toDouble(),
      xvms[cc + 3].toDouble());
  }
}

//-----------------------------------------------------------------------------
void pqOMETransferFunctionsPropertyWidget::setXrgbPoints(int index, const QList<QVariant>& xrgb)
{
  auto& internals = (*this->Internals);
  auto smgroup = internals.Group.GetPointer();
  assert(index < static_cast<int>(smgroup->GetNumberOfProperties()));
  auto lut = vtkSMPropertyHelper(smgroup->GetProperty(index)).GetAsProxy();
  auto stc = vtkDiscretizableColorTransferFunction::SafeDownCast(lut->GetClientSideObject());

  stc->RemoveAllPoints();
  for (int cc = 0; (cc + 3) < xrgb.size(); cc += 4)
  {
    stc->AddRGBPoint(xrgb[cc].toDouble(), xrgb[cc + 1].toDouble(), xrgb[cc + 2].toDouble(),
      xrgb[cc + 3].toDouble());
  }
}
