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

   Program: ParaView
   Module:    pqPipelineBrowserWidget.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 "pqPipelineBrowserWidget.h"

#include "pqActiveObjects.h"
#include "pqApplicationCore.h"
#include "pqExtractor.h"
#include "pqLiveInsituManager.h"
#include "pqLiveInsituVisualizationManager.h"
#include "pqOutputPort.h"
#include "pqPipelineAnnotationFilterModel.h"
#include "pqPipelineModel.h"
#include "pqPipelineModelSelectionAdaptor.h"
#include "pqPipelineSource.h"
#include "pqServer.h"
#include "pqServerManagerModel.h"
#include "pqUndoStack.h"
#include "pqView.h"
#include "vtkNew.h"
#include "vtkPVGeneralSettings.h"
#include "vtkSMPVRepresentationProxy.h"
#include "vtkSMParaViewPipelineControllerWithRendering.h"
#include "vtkSMPropertyHelper.h"
#include "vtkSMScalarBarWidgetRepresentationProxy.h"
#include "vtkSMTransferFunctionManager.h"
#include "vtkSMViewProxy.h"

#include <QHeaderView>
#include <QKeyEvent>
#include <QMenu>

#include <cassert>

//-----------------------------------------------------------------------------
pqPipelineBrowserWidget::pqPipelineBrowserWidget(QWidget* parentObject)
  : Superclass(parentObject)
  , PipelineModel(
      new pqPipelineModel(*pqApplicationCore::instance()->getServerManagerModel(), this))
  , FilteredPipelineModel(new pqPipelineAnnotationFilterModel(this))
  , ContextMenu(new QMenu(this))
{
  this->configureModel();

  // Initialize pqFlatTreeView.
  this->Superclass::setModel(this->FilteredPipelineModel);
  this->getHeader()->hide();
  this->getHeader()->moveSection(1, 0);
  this->installEventFilter(this);
  this->setSelectionMode(pqFlatTreeView::ExtendedSelection);
  this->setContextMenuPolicy(Qt::DefaultContextMenu);

  // Connect internal handlers
  QObject::connect(
    this, SIGNAL(clicked(const QModelIndex&)), this, SLOT(handleIndexClicked(const QModelIndex&)));
  QObject::connect(
    &pqActiveObjects::instance(), SIGNAL(viewChanged(pqView*)), this, SLOT(setActiveView(pqView*)));

  new pqPipelineModelSelectionAdaptor(this->getSelectionModel());
}

//-----------------------------------------------------------------------------
pqPipelineBrowserWidget::~pqPipelineBrowserWidget()
{
}

//-----------------------------------------------------------------------------
void pqPipelineBrowserWidget::configureModel()
{
  this->FilteredPipelineModel->setSourceModel(this->PipelineModel);

  // Connect the model to the ServerManager model.
  pqServerManagerModel* smModel = pqApplicationCore::instance()->getServerManagerModel();

  // We connect to `preServerAdded` instead of `serverAdded` signal.
  // This makes it possible for the pqPipelineModel to become aware of a new
  // server connection before the
  // vtkSMParaViewPipelineController::InitializeSession is called by
  // pqServerManagerModel. Thus if any proxies are created during that call, the
  // pqPipelineModel knows which session they belong to.
  QObject::connect(
    smModel, SIGNAL(preServerAdded(pqServer*)), this->PipelineModel, SLOT(addServer(pqServer*)));
  QObject::connect(
    smModel, SIGNAL(serverRemoved(pqServer*)), this->PipelineModel, SLOT(removeServer(pqServer*)));
  QObject::connect(smModel, SIGNAL(sourceAdded(pqPipelineSource*)), this->PipelineModel,
    SLOT(addSource(pqPipelineSource*)));
  QObject::connect(smModel, SIGNAL(sourceRemoved(pqPipelineSource*)), this->PipelineModel,
    SLOT(removeSource(pqPipelineSource*)));
  QObject::connect(smModel, SIGNAL(connectionAdded(pqPipelineSource*, pqPipelineSource*, int)),
    this->PipelineModel, SLOT(addConnection(pqPipelineSource*, pqPipelineSource*, int)));
  QObject::connect(smModel, SIGNAL(connectionRemoved(pqPipelineSource*, pqPipelineSource*, int)),
    this->PipelineModel, SLOT(removeConnection(pqPipelineSource*, pqPipelineSource*, int)));

  // monitor extractor related signals.
  QObject::connect(smModel, SIGNAL(extractorAdded(pqExtractor*)), this->PipelineModel,
    SLOT(addExtractor(pqExtractor*)));
  QObject::connect(smModel, SIGNAL(extractorRemoved(pqExtractor*)), this->PipelineModel,
    SLOT(removeExtractor(pqExtractor*)));
  QObject::connect(smModel, SIGNAL(connectionAdded(pqServerManagerModelItem*, pqExtractor*)),
    this->PipelineModel, SLOT(addConnection(pqServerManagerModelItem*, pqExtractor*)));
  QObject::connect(smModel, SIGNAL(connectionRemoved(pqServerManagerModelItem*, pqExtractor*)),
    this->PipelineModel, SLOT(removeConnection(pqServerManagerModelItem*, pqExtractor*)));

  // Use the tree view's font as the base for the model's modified
  // font.
  QFont modifiedFont = this->font();
  modifiedFont.setBold(true);
  this->PipelineModel->setModifiedFont(modifiedFont);

  // Make sure the tree items get expanded when new descendents
  // are added.
  QObject::connect(this->PipelineModel, SIGNAL(firstChildAdded(const QModelIndex&)), this,
    SLOT(expandWithModelIndexTranslation(const QModelIndex&)));
}

//-----------------------------------------------------------------------------
void pqPipelineBrowserWidget::setActiveView(pqView* view)
{
  this->PipelineModel->setView(view);
}

//-----------------------------------------------------------------------------
bool pqPipelineBrowserWidget::eventFilter(QObject* object, QEvent* eventArg)
{
  if (object == this && eventArg->type() == QEvent::KeyPress)
  {
    QKeyEvent* keyEvent = static_cast<QKeyEvent*>(eventArg);
    if (keyEvent->key() == Qt::Key_Delete || keyEvent->key() == Qt::Key_Backspace)
    {
      Q_EMIT this->deleteKey();
    }
  }

  return this->Superclass::eventFilter(object, eventArg);
}

//----------------------------------------------------------------------------
bool pqPipelineBrowserWidget::viewportEvent(QEvent* evt)
{
  if (evt->type() == QEvent::FontChange)
  {
    // Pass the changed font to the model otherwise it doesn't use
    // correct font for modified items.
    QFont modifiedFont = this->font();
    modifiedFont.setBold(true);
    this->PipelineModel->setModifiedFont(modifiedFont);
  }
  return this->Superclass::viewportEvent(evt);
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::handleIndexClicked(const QModelIndex& index_)
{
  // we make sure we are only clicking on an eye
  if (index_.column() == 1)
  {
    vtkNew<vtkSMParaViewPipelineControllerWithRendering> controller;

    // Get object relative to pqPipelineModel
    const pqPipelineModel* model = this->getPipelineModel(index_);
    QModelIndex index = this->pipelineModelIndex(index_);

    // We need to obtain the source to give the undo element some sensible name.
    pqServerManagerModelItem* smModelItem = model->getItemFor(index);
    pqPipelineSource* source = qobject_cast<pqPipelineSource*>(smModelItem);
    pqOutputPort* port =
      source ? source->getOutputPort(0) : qobject_cast<pqOutputPort*>(smModelItem);
    if (port)
    {
      pqView* activeView = pqActiveObjects::instance().activeView();
      vtkSMViewProxy* viewProxy = activeView ? activeView->getViewProxy() : NULL;
      bool cur_state = (viewProxy == NULL
          ? false
          : (controller->GetVisibility(port->getSourceProxy(), port->getPortNumber(), viewProxy)));

      bool new_visibility_state = !cur_state;
      bool is_selected = false;
      QModelIndexList indexes = this->getSelectionModel()->selectedIndexes();
      foreach (QModelIndex selIndex_, indexes)
      {
        // Convert index to pqPipelineModel
        QModelIndex selIndex = this->pipelineModelIndex(selIndex_);

        if (selIndex.row() == index.row() && selIndex.parent() == index.parent())
        {
          is_selected = true;
          break;
        }
      }
      if (is_selected)
      {
        this->setVisibility(new_visibility_state, indexes);
      }
      else
      {
        // although there's a selected group of objects, the user clicked on the
        // eye for some other item. In that case, we only affect the clicked
        // item.
        QModelIndexList indexes2;
        indexes2 << index;
        this->setVisibility(new_visibility_state, indexes2);
        // change the selection to the item, if we just made it visible.
        if (new_visibility_state)
        {
          QModelIndex itemIndex = this->getModel()->index(index_.row(), 0, index_.parent());
          this->getSelectionModel()->setCurrentIndex(
            itemIndex, QItemSelectionModel::ClearAndSelect);
        }
      }
    }
    else if (auto extractor = qobject_cast<pqExtractor*>(smModelItem))
    {
      // toggle enabled state for the extractor.
      auto activeView = pqActiveObjects::instance().activeView();
      extractor->toggleEnabledState(activeView);
    }
  }
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::setSelectionVisibility(bool visible)
{
  QModelIndexList indexes = this->getSelectionModel()->selectedIndexes();
  this->setVisibility(visible, indexes);
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::setVisibility(bool visible, const QModelIndexList& indexes)
{
  bool begun_undo_set = false;

  foreach (QModelIndex index_, indexes)
  {
    // Get object relative to pqPipelineModel
    const pqPipelineModel* model = this->getPipelineModel(index_);
    QModelIndex index = this->pipelineModelIndex(index_);

    pqServerManagerModelItem* smModelItem = model->getItemFor(index);
    pqPipelineSource* source = qobject_cast<pqPipelineSource*>(smModelItem);
    pqOutputPort* port =
      source ? source->getOutputPort(0) : qobject_cast<pqOutputPort*>(smModelItem);

    if (port)
    {
      if (!begun_undo_set)
      {
        begun_undo_set = true;
        if (indexes.size() == 1)
        {
          source = port->getSource();
          BEGIN_UNDO_SET(QString("%1 %2").arg(visible ? "Show" : "Hide").arg(source->getSMName()));
        }
        else
        {
          BEGIN_UNDO_SET(QString("%1 Selected").arg(visible ? "Show" : "Hide"));
        }
      }
      pqPipelineBrowserWidget::setVisibility(visible, port);
    }
  }
  if (begun_undo_set)
  {
    END_UNDO_SET();
  }
  if (pqView* view = pqActiveObjects::instance().activeView())
  {
    if (view->getNumberOfVisibleDataRepresentations() == 1 && visible &&
      vtkPVGeneralSettings::GetInstance()->GetResetDisplayEmptyViews())
    {
      view->resetDisplay();
    }
    pqActiveObjects::instance().activeView()->render();
  }
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::contextMenuEvent(QContextMenuEvent* e)
{
  this->setFocus(Qt::OtherFocusReason);

  this->ContextMenu->exec(this->mapToGlobal(e->pos()));
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::setVisibility(bool visible, pqOutputPort* port)
{
  if (port)
  {
    auto& activeObjects = pqActiveObjects::instance();
    vtkNew<vtkSMParaViewPipelineControllerWithRendering> controller;
    pqView* activeView = activeObjects.activeView();
    vtkSMViewProxy* viewProxy = activeView ? activeView->getViewProxy() : NULL;
    int scalarBarMode = vtkPVGeneralSettings::GetInstance()->GetScalarBarMode();

    if (pqLiveInsituManager::isInsituServer(port->getServer()))
    {
      // we don't need to add an extract for writer parameters proxies.
      if (!pqLiveInsituManager::isWriterParametersProxy(port->getSourceProxy()))
      {
        pqLiveInsituVisualizationManager* mgr =
          pqLiveInsituManager::managerFromInsitu(port->getServer());
        if (mgr && mgr->addExtract(port))
        {
          // refresh the pipeline browser icon.
        }
      }
    }
    else
    {
      if (visible)
      {
        // Make sure the given port is selected specially if we are in
        // multi-server / catalyst configuration type
        activeObjects.setActivePort(port);
      }

      auto activeLayout = activeObjects.activeLayout();
      const auto location = activeObjects.activeLayoutLocation();

      vtkSMProxy* repr = controller->SetVisibility(
        port->getSourceProxy(), port->getPortNumber(), viewProxy, visible);
      if (visible && viewProxy == nullptr && repr)
      {
        // this implies that the controller would have created a new view.
        // let's get that view so we toggle scalar bar visibility in that view
        // and also add it to layout.
        viewProxy = vtkSMViewProxy::FindView(repr);
        controller->AssignViewToLayout(viewProxy, activeLayout, location);
      }

      // assign to layout, in case a new view is created.
      // update scalar bars: show new ones if needed. Hiding of scalar bars is
      // taken care of by vtkSMParaViewPipelineControllerWithRendering (I still
      // wonder if that's the best thing to do).
      if (scalarBarMode != vtkPVGeneralSettings::MANUAL_SCALAR_BARS)
      {
        // This gets executed if scalar bar mode is
        // AUTOMATICALLY_HIDE_SCALAR_BARS or AUTOMATICALLY_SHOW_AND_HIDE_SCALAR_BARS
        vtkSMPVRepresentationProxy* PVRepr = vtkSMPVRepresentationProxy::SafeDownCast(repr);
        if (visible && PVRepr && vtkSMPVRepresentationProxy::GetUsingScalarColoring(repr))
        {
          int stickyVisible = PVRepr->IsScalarBarStickyVisible(viewProxy);
          if (stickyVisible != -1)
          {
            PVRepr->SetScalarBarVisibility(viewProxy, stickyVisible);
          }
          else if (scalarBarMode == vtkPVGeneralSettings::AUTOMATICALLY_SHOW_AND_HIDE_SCALAR_BARS)
          {
            PVRepr->SetScalarBarVisibility(viewProxy, true);
          }
          else if (scalarBarMode == vtkPVGeneralSettings::AUTOMATICALLY_HIDE_SCALAR_BARS)
          {
            PVRepr->SetScalarBarVisibility(viewProxy, false);
          }
          else
          {
            std::cerr << "You might have added a new scalar bar mode, you need to do something "
                         "here, skipping"
                      << std::endl;
          }
        }
      }
    }
  }
}

//----------------------------------------------------------------------------
QMenu* pqPipelineBrowserWidget::contextMenu() const
{
  return this->ContextMenu;
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::setAnnotationFilterMatching(bool matching)
{
  this->FilteredPipelineModel->setAnnotationFilterMatching(matching);
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::enableAnnotationFilter(const QString& annotationKey)
{
  this->FilteredPipelineModel->enableAnnotationFilter(annotationKey);
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::disableAnnotationFilter()
{
  this->FilteredPipelineModel->disableAnnotationFilter();
}
//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::enableSessionFilter(vtkSession* session)
{
  this->FilteredPipelineModel->enableSessionFilter(session);
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::disableSessionFilter()
{
  this->FilteredPipelineModel->disableSessionFilter();
}

//----------------------------------------------------------------------------
const QModelIndex pqPipelineBrowserWidget::pipelineModelIndex(const QModelIndex& index) const
{
  if (qobject_cast<const pqPipelineModel*>(index.model()))
  {
    return index;
  }
  const QSortFilterProxyModel* filterModel =
    qobject_cast<const QSortFilterProxyModel*>(index.model());
  assert("Invalid model used inside index" && filterModel);

  // Make a recursive call to support unknown filter depth
  return this->pipelineModelIndex(filterModel->mapToSource(index));
}

//----------------------------------------------------------------------------
const pqPipelineModel* pqPipelineBrowserWidget::getPipelineModel(const QModelIndex& index) const
{
  if (const pqPipelineModel* model = qobject_cast<const pqPipelineModel*>(index.model()))
  {
    return model;
  }

  const QSortFilterProxyModel* filterModel =
    qobject_cast<const QSortFilterProxyModel*>(index.model());
  assert("Invalid model used inside index" && filterModel);

  // Make a recusrive call to support unknown filter depth
  return this->getPipelineModel(filterModel->mapToSource(index));
}

//----------------------------------------------------------------------------
void pqPipelineBrowserWidget::expandWithModelIndexTranslation(const QModelIndex& index)
{
  this->expand(this->FilteredPipelineModel->mapFromSource(index));
}

//-----------------------------------------------------------------------------
void pqPipelineBrowserWidget::setModel(pqPipelineModel* model)
{
  if (!model)
    return;

  delete this->PipelineModel;
  this->PipelineModel = model;
  this->PipelineModel->setParent(this);

  this->configureModel();
}
