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

   Program: ParaView
   Module:    pqChangeInputDialog.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 "pqChangeInputDialog.h"
#include "ui_pqChangeInputDialog.h"

#include "pqActiveObjects.h"
#include "pqApplicationCore.h"
#include "pqOutputPort.h"
#include "pqPipelineFilter.h"
#include "pqPipelineModel.h"
#include "pqServer.h"
#include "pqServerManagerModel.h"
#include "vtkSMDocumentation.h"
#include "vtkSMInputProperty.h"
#include "vtkSMPropertyHelper.h"
#include "vtkSMProxy.h"
#include "vtkSmartPointer.h"

#include <QHeaderView>
#include <QItemSelectionModel>
#include <QLineEdit>
#include <QRadioButton>

#include <cassert>

class pqChangeInputDialog::pqInternals : public Ui::pqChangeInputDialog
{
public:
  pqPipelineModel* PipelineModel;
  vtkSmartPointer<vtkSMProxy> Proxy;

  QString ActiveInputProperty;
  bool BlockSelectionChanged;
  QMap<QString, QList<pqOutputPort*>> Inputs;
  QMap<QString, bool> AcceptsMultipleConnections;
};

//-----------------------------------------------------------------------------
pqChangeInputDialog::pqChangeInputDialog(vtkSMProxy* filterProxy, QWidget* parentObject)
  : Superclass(parentObject)
{
  assert(filterProxy != nullptr);

  this->Internals = new pqInternals();
  this->Internals->Proxy = filterProxy;
  this->Internals->BlockSelectionChanged = false;

  this->Internals->setupUi(this);
  // hide the Context Help item (it's a "?" in the Title Bar for Windows, a menu item for Linux)
  this->setWindowFlags(this->windowFlags().setFlag(Qt::WindowContextHelpButtonHint, false));

  pqServerManagerModel* smModel = pqApplicationCore::instance()->getServerManagerModel();
  this->Internals->PipelineModel = new pqPipelineModel(*smModel, this);
  this->Internals->PipelineModel->setEditable(false);
  this->Internals->pipelineView->setModel(this->Internals->PipelineModel);

  this->Internals->pipelineView->getHeader()->hide();
  // don't show the visibility icons.
  this->Internals->pipelineView->getHeader()->hideSection(1);
  this->Internals->pipelineView->setRootIndex(
    this->Internals->PipelineModel->getIndexFor(pqActiveObjects::instance().activeServer()));
  this->Internals->pipelineView->expandAll();

  QObject::connect(this->Internals->pipelineView->getSelectionModel(),
    SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)), this,
    SLOT(selectionChanged()));

  // build current input list.
  QList<const char*> input_property_names = pqPipelineFilter::getInputPorts(filterProxy);
  Q_FOREACH (const char* property_name, input_property_names)
  {
    QList<pqOutputPort*>& list = this->Internals->Inputs[property_name];

    vtkSMPropertyHelper helper(filterProxy, property_name);
    unsigned int numProxies = helper.GetNumberOfElements();
    for (unsigned int cc = 0; cc < numProxies; cc++)
    {
      pqPipelineSource* source = smModel->findItem<pqPipelineSource*>(helper.GetAsProxy(cc));
      if (source == nullptr)
      {
        qDebug("Not all current inputs to this filter are know to the ProxyManager");
        continue;
      }
      pqOutputPort* port = source->getOutputPort(helper.GetOutputPort(cc));
      list.push_back(port);
    }

    // check if multiple connections are accepted by this input property.
    vtkSMInputProperty* ip =
      vtkSMInputProperty::SafeDownCast(filterProxy->GetProperty(property_name));
    if (ip && ip->GetMultipleInput())
    {
      this->Internals->AcceptsMultipleConnections[property_name] = true;
    }
    else
    {
      this->Internals->AcceptsMultipleConnections[property_name] = false;
    }
  }

  this->buildPortWidgets();
}

//-----------------------------------------------------------------------------
pqChangeInputDialog::~pqChangeInputDialog()
{
  delete this->Internals;
  this->Internals = nullptr;
}

//-----------------------------------------------------------------------------
const QMap<QString, QList<pqOutputPort*>>& pqChangeInputDialog::selectedInputs() const
{
  return this->Internals->Inputs;
}

//-----------------------------------------------------------------------------
void pqChangeInputDialog::buildPortWidgets()
{
  QVBoxLayout* vbox = qobject_cast<QVBoxLayout*>(this->Internals->buttonFrame->layout());

  // we use this since it returns a nice ordered list of the input port names
  // rather than an alphabetically sorted one.
  QList<const char*> input_property_names = pqPipelineFilter::getInputPorts(this->Internals->Proxy);
  QRadioButton* firstButton = nullptr;
  for (int cc = 0; cc < input_property_names.size(); cc++)
  {
    const char* input_prop_name = input_property_names[cc];
    vtkSMProperty* smproperty = this->Internals->Proxy->GetProperty(input_prop_name);
    QRadioButton* rb = new QRadioButton(this->Internals->buttonFrame);
    rb->setObjectName(input_prop_name);
    rb->setText(QCoreApplication::translate("ServerManagerXML", smproperty->GetXMLLabel()));
    if (smproperty->GetDocumentation())
    {
      rb->setToolTip(QCoreApplication::translate(
        "ServerManagerXML", smproperty->GetDocumentation()->GetDescription())
                       .trimmed());
    }
    vbox->addWidget(rb);

    QObject::connect(rb, SIGNAL(toggled(bool)), this, SLOT(inputPortToggled(bool)));

    firstButton = firstButton ? firstButton : rb;
  }
  vbox->addStretch();

  if (firstButton)
  {
    firstButton->setChecked(true);
  }

  if (this->Internals->Inputs.size() <= 1)
  {
    // no need to show the radio buttons when there's only 1 input port.
    this->Internals->buttonFrame->hide();
    this->Internals->line->hide();
    this->layout()->removeWidget(this->Internals->buttonFrame);
    this->layout()->removeWidget(this->Internals->line);
  }
}

//-----------------------------------------------------------------------------
void pqChangeInputDialog::inputPortToggled(bool checked)
{
  if (!checked)
  {
    return;
  }

  QRadioButton* radioButton = qobject_cast<QRadioButton*>(this->sender());
  this->Internals->selectInputLabel->setText(tr("Select <b>%1</b>").arg(radioButton->text()));

  QModelIndexList selected_indexes;
  QString input_prop_name = radioButton->objectName();
  this->Internals->ActiveInputProperty = input_prop_name;

  QList<pqOutputPort*>& list = this->Internals->Inputs[input_prop_name];
  Q_FOREACH (pqOutputPort* port, list)
  {
    selected_indexes.push_back(this->Internals->PipelineModel->getIndexFor(port));
  }

  // update selectability i.e. what sources in the pipelines are acceptable as
  // inputs for the current input port.
  pqServerManagerModel* smModel = pqApplicationCore::instance()->getServerManagerModel();
  this->Internals->PipelineModel->setSubtreeSelectable(
    pqActiveObjects::instance().activeServer(), true);
  pqPipelineSource* pqproxy = smModel->findItem<pqPipelineSource*>(this->Internals->Proxy);
  if (pqproxy)
  {
    this->Internals->PipelineModel->setSubtreeSelectable(pqproxy, false);
  }

  vtkSMInputProperty* inputProp = vtkSMInputProperty::SafeDownCast(
    this->Internals->Proxy->GetProperty(input_prop_name.toUtf8().data()));

  QModelIndex root = this->Internals->pipelineView->getRootIndex();
  QModelIndex index = this->Internals->PipelineModel->getNextIndex(root, root);
  while (index.isValid())
  {
    if (this->Internals->PipelineModel->isSelectable(index))
    {
      pqServerManagerModelItem* item = this->Internals->PipelineModel->getItemFor(index);
      pqPipelineSource* source = qobject_cast<pqPipelineSource*>(item);
      pqOutputPort* port = qobject_cast<pqOutputPort*>(item);
      if (source)
      {
        port = source->getOutputPort(0);
      }
      if (source && source->getNumberOfOutputPorts() > 1)
      {
        this->Internals->PipelineModel->setSelectable(index, false);
      }
      else if (port)
      {
        inputProp->RemoveAllUncheckedProxies();
        inputProp->AddUncheckedInputConnection(
          port->getSource()->getProxy(), port->getPortNumber());
        this->Internals->PipelineModel->setSelectable(index, inputProp->IsInDomains() > 0);
        inputProp->RemoveAllUncheckedProxies();
      }
      else
      {
        this->Internals->PipelineModel->setSelectable(index, false);
      }
    }
    index = this->Internals->PipelineModel->getNextIndex(index, root);
  }

  // update selection mode.
  if (this->Internals->AcceptsMultipleConnections[input_prop_name])
  {
    this->Internals->pipelineView->setSelectionMode(pqFlatTreeView::ExtendedSelection);
  }
  else
  {
    this->Internals->pipelineView->setSelectionMode(pqFlatTreeView::SingleSelection);
  }

  // update current selection.
  this->Internals->BlockSelectionChanged = true;
  QItemSelectionModel* selModel = this->Internals->pipelineView->getSelectionModel();
  selModel->clear();
  Q_FOREACH (QModelIndex idx, selected_indexes)
  {
    selModel->select(idx, QItemSelectionModel::Select);
  }
  this->Internals->BlockSelectionChanged = false;
  this->selectionChanged();
}

//-----------------------------------------------------------------------------
void pqChangeInputDialog::selectionChanged()
{
  if (this->Internals->BlockSelectionChanged)
  {
    return;
  }

  QList<pqOutputPort*>& list = this->Internals->Inputs[this->Internals->ActiveInputProperty];
  list.clear();

  QItemSelectionModel* selModel = this->Internals->pipelineView->getSelectionModel();
  QModelIndexList indexes = selModel->selectedIndexes();
  Q_FOREACH (QModelIndex idx, indexes)
  {
    pqServerManagerModelItem* item = this->Internals->PipelineModel->getItemFor(idx);
    pqOutputPort* port = qobject_cast<pqOutputPort*>(item);
    pqPipelineSource* source = qobject_cast<pqPipelineSource*>(item);
    if (source)
    {
      port = source->getOutputPort(0);
    }
    list.push_back(port);
  }
}
