// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-FileCopyrightText: Copyright (c) Sandia Corporation
// SPDX-License-Identifier: BSD-3-Clause
#include "pqFindDataWidget.h"
#include "ui_pqFindDataWidget.h"

#include "pqActiveObjects.h"
#include "pqApplicationCore.h"
#include "pqCoreUtilities.h"
#include "pqObjectBuilder.h"
#include "pqPipelineSource.h"
#include "pqPropertiesPanel.h"
#include "pqProxyWidget.h"
#include "pqSelectionManager.h"
#include "pqServer.h"
#include "pqServerManagerModel.h"
#include "vtkPVDataInformation.h"
#include "vtkSMSelectionHelper.h"
#include "vtkSMSessionProxyManager.h"
#include "vtkSMSourceProxy.h"
#include "vtkSMTrace.h"
#include "vtkSMUncheckedPropertyHelper.h"
#include "vtkSelectionNode.h"

#include <QMessageBox>
#include <QPushButton>
#include <QScopedValueRollback>

//=============================================================================
class pqFindDataWidget::pqInternals
{
  mutable bool InFindData = false;

public:
  Ui::FindDataWidget Ui;
  QPointer<pqServer> Server;
  QPointer<pqProxyWidget> ProxyWidget;

  void findData() const;
  void extract() const;
  void plotOverTime() const;
  void freeze() const;
  void handleSelectionChanged(bool hasSelection)
  {
    if (this->InFindData == false)
    {
      this->Ui.clear->click();
    }

    this->Ui.extract->setEnabled(hasSelection);
    this->Ui.freeze->setEnabled(hasSelection);
    this->Ui.plotOverTime->setEnabled(hasSelection);
  }

  static int selectedElementType(vtkSMProxy* selSource)
  {
    Q_ASSERT(selSource);
    if (selSource->GetProperty("ElementType") != nullptr)
    {
      return vtkSMPropertyHelper(selSource, "ElementType").GetAsInt();
    }
    else
    {
      return vtkSelectionNode::ConvertSelectionFieldToAttributeType(
        vtkSMPropertyHelper(selSource, "FieldType").GetAsInt());
    }
  }
};

//-----------------------------------------------------------------------------
void pqFindDataWidget::pqInternals::findData() const
{
  const QScopedValueRollback<bool> rollback(this->InFindData, true);

  Q_ASSERT(this->ProxyWidget != nullptr);
  auto helper = this->ProxyWidget->proxy();

  vtkSMPropertyHelper inputHelper(helper, "Input");
  auto producer = vtkSMSourceProxy::SafeDownCast(inputHelper.GetAsProxy(0));
  auto port = inputHelper.GetOutputPort(0);
  Q_ASSERT(producer != nullptr); // ensured by enabled-state of buttons.

  auto selManager =
    qobject_cast<pqSelectionManager*>(pqApplicationCore::instance()->manager("SELECTION_MANAGER"));

  vtkSMPropertyHelper queryHelper(helper, "QueryString");
  if (QString(queryHelper.GetAsString(0)).trimmed().isEmpty())
  {
    // no query string specified, clear selection.
    producer->SetSelectionInput(port, nullptr, 0);
    if (selManager)
    {
      selManager->select(nullptr);
    }
    return;
  }

  auto pxm = helper->GetSessionProxyManager();
  Q_ASSERT(pxm != nullptr);

  vtkSmartPointer<vtkSMSourceProxy> selectionSource;
  selectionSource.TakeReference(
    vtkSMSourceProxy::SafeDownCast(pxm->NewProxy("sources", "SelectionQuerySource")));
  if (!selectionSource)
  {
    qCritical("Failed to create 'SelectionQuerySource' proxy. "
              "Cannot create selection.");
    return;
  }

  // We've intentionally named the properties on the `FindDataHelper` proxy
  // and "SelectionQuerySource" similarly, so we can use 'vtkSMProxy::Copy'.
  selectionSource->Copy(helper);
  selectionSource->UpdateVTKObjects();
  // create a new append Selections filter and append the selection source
  vtkSmartPointer<vtkSMSourceProxy> appendSelections;
  appendSelections.TakeReference(vtkSMSourceProxy::SafeDownCast(
    vtkSMSelectionHelper::NewAppendSelectionsFromSelectionSource(selectionSource)));
  // set selection input
  producer->SetSelectionInput(port, appendSelections, 0);

  auto fieldType =
    vtkSelectionNode::GetFieldTypeAsString(vtkSelectionNode::ConvertAttributeTypeToSelectionField(
      vtkSMPropertyHelper(selectionSource, "ElementType").GetAsInt()));

  SM_SCOPED_TRACE(CallFunction)
    .arg("QuerySelect")
    .arg("QueryString", vtkSMPropertyHelper(selectionSource, "QueryString").GetAsString())
    .arg("FieldType", fieldType)
    .arg("InsideOut", vtkSMPropertyHelper(selectionSource, "InsideOut").GetAsInt())
    .arg("comment", "create a query selection");

  // ugliness with selection manager -- need a better way of doing this!
  if (selManager)
  {
    auto smmodel = pqApplicationCore::instance()->getServerManagerModel();
    auto pqproxy = smmodel->findItem<pqPipelineSource*>(producer);
    Q_ASSERT(pqproxy);
    selManager->select(pqproxy->getOutputPort(port));
  }
}

//-----------------------------------------------------------------------------
void pqFindDataWidget::pqInternals::freeze() const
{
  auto selManager =
    qobject_cast<pqSelectionManager*>(pqApplicationCore::instance()->manager("SELECTION_MANAGER"));
  Q_ASSERT(selManager != nullptr);

  auto port = selManager->getSelectedPort();
  Q_ASSERT(port != nullptr);

  auto appendSelections = vtkSMSourceProxy::SafeDownCast(port->getSelectionInput());
  if (!appendSelections)
  {
    return;
  }

  if (port->getServer()->isRemote())
  {
    unsigned int numInputs = vtkSMPropertyHelper(appendSelections, "Input").GetNumberOfElements();
    for (unsigned int i = 0; i < numInputs; ++i)
    {
      auto selectionSource = vtkSMSourceProxy::SafeDownCast(
        vtkSMPropertyHelper(appendSelections, "Input").GetAsProxy(i));
      // BUG: 6783. Warn user when converting a Frustum|Threshold|Query selection to
      // an id based selection.
      if (strcmp(selectionSource->GetXMLName(), "FrustumSelectionSource") == 0 ||
        strcmp(selectionSource->GetXMLName(), "ThresholdSelectionSource") == 0 ||
        strcmp(selectionSource->GetXMLName(), "SelectionQuerySource") == 0)
      {
        // We need to determine how many ids are present approximately.
        auto dataSource = vtkSMSourceProxy::SafeDownCast(port->getSource()->getProxy());
        auto selInfo = dataSource->GetSelectionOutput(port->getPortNumber())->GetDataInformation();
        const auto elemType = pqInternals::selectedElementType(selectionSource);
        if (selInfo->GetNumberOfElements(elemType) > 10000)
        {
          auto userAnswer =
            QMessageBox::warning(pqCoreUtilities::mainWidget(), tr("Convert Selection"),
              tr("This selection conversion can potentially result in fetching a "
                 "large amount of data to the client.\n"
                 "Are you sure you want to continue?"),
              QMessageBox::Ok | QMessageBox::Cancel, QMessageBox::Cancel);
          if (userAnswer == QMessageBox::Ok)
          {
            // Showing the warning once is enough
            break;
          }
          else
          {
            return;
          }
        }
      }
    }
  }

  // Convert selection input to indices based selection
  bool selectionChanged;
  vtkSmartPointer<vtkSMSourceProxy> newAppendSelections;
  newAppendSelections.TakeReference(vtkSMSourceProxy::SafeDownCast(
    vtkSMSelectionHelper::ConvertAppendSelections(vtkSelectionNode::INDICES, appendSelections,
      vtkSMSourceProxy::SafeDownCast(port->getSource()->getProxy()), port->getPortNumber(),
      selectionChanged)));
  if (selectionChanged)
  {
    port->setSelectionInput(newAppendSelections, 0);
  }
}

//-----------------------------------------------------------------------------
void pqFindDataWidget::pqInternals::extract() const
{
  auto selManager =
    qobject_cast<pqSelectionManager*>(pqApplicationCore::instance()->manager("SELECTION_MANAGER"));
  Q_ASSERT(selManager != nullptr);

  auto port = selManager->getSelectedPort();
  Q_ASSERT(port != nullptr);

  pqObjectBuilder* builder = pqApplicationCore::instance()->getObjectBuilder();
  builder->createFilter("filters", "ExtractSelection", port->getSource(), port->getPortNumber());
}

//-----------------------------------------------------------------------------
void pqFindDataWidget::pqInternals::plotOverTime() const
{
  auto selManager =
    qobject_cast<pqSelectionManager*>(pqApplicationCore::instance()->manager("SELECTION_MANAGER"));
  Q_ASSERT(selManager != nullptr);

  auto port = selManager->getSelectedPort();
  Q_ASSERT(port != nullptr);

  pqObjectBuilder* builder = pqApplicationCore::instance()->getObjectBuilder();
  builder->createFilter(
    "filters", "ExtractSelectionOverTime", port->getSource(), port->getPortNumber());
}

//=============================================================================
pqFindDataWidget::pqFindDataWidget(QWidget* parentObject)
  : Superclass(parentObject)
  , Internals(new pqFindDataWidget::pqInternals())
{
  auto& internals = (*this->Internals);
  internals.Ui.setupUi(this);
  internals.Ui.verticalLayout->setContentsMargins(pqPropertiesPanel::suggestedMargin(),
    pqPropertiesPanel::suggestedMargin(), pqPropertiesPanel::suggestedMargin(),
    pqPropertiesPanel::suggestedMargin());
  internals.Ui.verticalLayout->setSpacing(pqPropertiesPanel::suggestedVerticalSpacing());

  // change the findData button palette so it is green when it is enabled.
  // pqCoreUtilities::initializeClickMeButton(internals.Ui.findData);

  // hookup expander buttons
  QObject::connect(internals.Ui.createExpander, &pqExpanderButton::toggled,
    [&internals](bool checked)
    {
      internals.Ui.container->setVisible(checked);
      internals.Ui.findData->setVisible(checked);
      internals.Ui.reset->setVisible(checked);
      internals.Ui.clear->setVisible(checked);
    });

  QObject::connect(internals.Ui.informationExpander, &pqExpanderButton::toggled,
    internals.Ui.informationContainer, &QWidget::setVisible);
  QObject::connect(internals.Ui.selectionDisplayExpander, &pqExpanderButton::toggled,
    internals.Ui.selectionDisplayProperties, &QWidget::setVisible);

  // hookup findData / reset / clear
  QObject::connect(internals.Ui.reset, &QAbstractButton::clicked,
    [&internals](bool)
    {
      if (internals.ProxyWidget)
      {
        internals.ProxyWidget->reset();
      }
      internals.Ui.reset->setEnabled(false);
      internals.Ui.findData->setEnabled(false);
    });

  QObject::connect(internals.Ui.clear, &QAbstractButton::clicked,
    [&internals](bool)
    {
      if (internals.ProxyWidget)
      {
        internals.ProxyWidget->proxy()->ResetPropertiesToDefault(vtkSMProxy::ONLY_XML);
        internals.ProxyWidget->reset();
      }
      internals.Ui.reset->setEnabled(false);
      internals.Ui.findData->setEnabled(false);
      internals.Ui.clear->setEnabled(false);
    });

  QObject::connect(internals.Ui.findData, &QAbstractButton::clicked,
    [&internals](bool)
    {
      if (internals.ProxyWidget)
      {
        internals.ProxyWidget->apply();
        internals.findData();
      }
      internals.Ui.reset->setEnabled(false);
      // keep findData enabled, there's no reason the user can't hit the button
      // again to generate a new selection with same property values. We should
      // allow for it since the data may have changed.
      // internals.Ui.findData->setEnabled(false);
    });

  QObject::connect(
    internals.Ui.freeze, &QAbstractButton::clicked, [&internals]() { internals.freeze(); });
  QObject::connect(
    internals.Ui.extract, &QAbstractButton::clicked, [&internals]() { internals.extract(); });
  QObject::connect(internals.Ui.plotOverTime, &QAbstractButton::clicked,
    [&internals]() { internals.plotOverTime(); });

  QObject::connect(internals.Ui.informationContainer, &pqFindDataCurrentSelectionFrame::showing,
    [&internals](pqOutputPort* port)
    {
      if (port)
      {
        internals.Ui.informationExpander->setText(tr("Selected Data (%1)").arg(port->prettyName()));
      }
      else
      {
        internals.Ui.informationExpander->setText(tr("Selected Data (none)"));
      }
    });

  // if source is remove, ensure are not using it either as checked or unchecked
  // input to the helper.
  auto smmodel = pqApplicationCore::instance()->getServerManagerModel();
  QObject::connect(
    smmodel, &pqServerManagerModel::sourceRemoved, this, &pqFindDataWidget::aboutToRemove);

  this->connect(&pqActiveObjects::instance(), &pqActiveObjects::serverChanged, this,
    &pqFindDataWidget::setServer);

  // if selection changes, clear the find data parameters to avoid confusion,
  // unless the selection was made using Find Data.
  auto selManager =
    qobject_cast<pqSelectionManager*>(pqApplicationCore::instance()->manager("SELECTION_MANAGER"));
  if (selManager)
  {
    QObject::connect(selManager, &pqSelectionManager::selectionChanged, this,
      &pqFindDataWidget::handleSelectionChanged);
  }
}

//-----------------------------------------------------------------------------
pqFindDataWidget::~pqFindDataWidget() = default;

//-----------------------------------------------------------------------------
pqServer* pqFindDataWidget::server() const
{
  const auto& internals = (*this->Internals);
  return internals.Server;
}

//-----------------------------------------------------------------------------
void pqFindDataWidget::setServer(pqServer* aserver)
{
  auto& internals = (*this->Internals);
  if (aserver == internals.Server)
  {
    return;
  }

  internals.Server = aserver;
  delete internals.ProxyWidget;

  // disable all buttons.
  internals.Ui.reset->setEnabled(false);
  internals.Ui.findData->setEnabled(false);
  internals.Ui.clear->setEnabled(false);

  if (!aserver)
  {
    return;
  }

  // setup ProxyWidget for selection creation.
  auto pxm = aserver->proxyManager();
  auto proxy = pxm->NewProxy("misc", "FindDataHelper");
  Q_ASSERT(proxy != nullptr);

  internals.ProxyWidget = new pqProxyWidget(proxy);
  internals.ProxyWidget->updatePanel();
  internals.ProxyWidget->setApplyChangesImmediately(false);
  internals.Ui.container->layout()->addWidget(internals.ProxyWidget);
  proxy->FastDelete();

  // enable buttons on modification.
  QObject::connect(internals.ProxyWidget.data(), &pqProxyWidget::changeAvailable,
    [&internals, proxy]()
    {
      vtkSMUncheckedPropertyHelper inputHelper(proxy, "Input");
      const bool hasInput = (inputHelper.GetAsProxy(0) != nullptr);
      vtkSMUncheckedPropertyHelper queryStringHelper(proxy, "QueryString");
      const bool hasQueryString =
        (queryStringHelper.GetAsString() != nullptr ? strlen(queryStringHelper.GetAsString()) : 0) >
        0;
      internals.Ui.findData->setEnabled(hasInput && hasQueryString);

      internals.Ui.reset->setEnabled(true);
      internals.Ui.clear->setEnabled(true);
    });
}

//-----------------------------------------------------------------------------
void pqFindDataWidget::aboutToRemove(pqPipelineSource* source)
{
  auto& internals = (*this->Internals);
  if (auto helper = internals.ProxyWidget ? internals.ProxyWidget->proxy() : nullptr)
  {
    vtkSMPropertyHelper inputHelper(helper, "Input");
    if (vtkSMPropertyHelper(helper, "Input").GetAsProxy(0) == source->getProxy() ||
      vtkSMUncheckedPropertyHelper(helper, "Input").GetAsProxy(0) == source->getProxy())
    {
      internals.Ui.clear->click();
    }
  }
}

//-----------------------------------------------------------------------------
void pqFindDataWidget::handleSelectionChanged(pqOutputPort* port)
{
  auto& internals = (*this->Internals);
  internals.handleSelectionChanged(port != nullptr);
}
