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

  Program:   Visualization Toolkit
  Module:    vtkExtractSelectedIds.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkExtractSelectedIds.h"

#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkCellType.h"
#include "vtkExtractCells.h"
#include "vtkIdList.h"
#include "vtkIdTypeArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkSelection.h"
#include "vtkSelectionNode.h"
#include "vtkSignedCharArray.h"
#include "vtkSmartPointer.h"
#include "vtkSortDataArray.h"
#include "vtkStdString.h"
#include "vtkStringArray.h"
#include "vtkUnstructuredGrid.h"

vtkStandardNewMacro(vtkExtractSelectedIds);

//----------------------------------------------------------------------------
vtkExtractSelectedIds::vtkExtractSelectedIds()
{
  this->SetNumberOfInputPorts(2);
}

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

//----------------------------------------------------------------------------
int vtkExtractSelectedIds::FillInputPortInformation(
  int port, vtkInformation* info)
{
  this->Superclass::FillInputPortInformation(port, info);
  if (port==0)
  {
    // this filter can only work with datasets.
    info->Remove(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE());
    info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
  }
  return 1;
}

//----------------------------------------------------------------------------
int vtkExtractSelectedIds::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *selInfo = inputVector[1]->GetInformationObject(0);
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  // verify the input selection and output
  vtkDataSet *input = vtkDataSet::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  if ( ! input )
  {
    vtkErrorMacro(<<"No input specified");
    return 0;
  }

  if ( ! selInfo )
  {
    //When not given a selection, quietly select nothing.
    return 1;
  }
  vtkSelection *sel = vtkSelection::SafeDownCast(
    selInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkSelectionNode *node = nullptr;
  if (sel->GetNumberOfNodes() == 1)
  {
    node = sel->GetNode(0);
  }
  if (!node)
  {
    vtkErrorMacro("Selection must have a single node.");
    return 0;
  }
  if (node->GetContentType() != vtkSelectionNode::GLOBALIDS &&
      node->GetContentType() != vtkSelectionNode::PEDIGREEIDS &&
      node->GetContentType() != vtkSelectionNode::VALUES &&
      node->GetContentType() != vtkSelectionNode::INDICES
      )
  {
    vtkErrorMacro("Incompatible CONTENT_TYPE.");
    return 0;
  }

  vtkDataSet *output = vtkDataSet::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkDebugMacro(<< "Extracting from dataset");

  int fieldType = vtkSelectionNode::CELL;
  if (node->GetProperties()->Has(vtkSelectionNode::FIELD_TYPE()))
  {
    fieldType = node->GetProperties()->Get(vtkSelectionNode::FIELD_TYPE());
  }
  switch (fieldType)
  {
    case vtkSelectionNode::CELL:
      return this->ExtractCells(node, input, output);
    case vtkSelectionNode::POINT:
      return this->ExtractPoints(node, input, output);
  }
  return 1;
}

// Copy the points marked as "in" and build a pointmap
static void vtkExtractSelectedIdsCopyPoints(vtkDataSet* input,
  vtkDataSet* output, signed char* inArray, vtkIdType* pointMap)
{
  vtkPoints* newPts = vtkPoints::New();

  vtkIdType i, numPts = input->GetNumberOfPoints();

  vtkIdTypeArray* originalPtIds = vtkIdTypeArray::New();
  originalPtIds->SetNumberOfComponents(1);
  originalPtIds->SetName("vtkOriginalPointIds");

  vtkPointData* inPD = input->GetPointData();
  vtkPointData* outPD = output->GetPointData();
  outPD->SetCopyGlobalIds(1);
  outPD->CopyAllocate(inPD);

  for (i = 0; i < numPts; i++)
  {
    if (inArray[i] > 0)
    {
      pointMap[i] = newPts->InsertNextPoint(input->GetPoint(i));
      outPD->CopyData(inPD, i, pointMap[i]);
      originalPtIds->InsertNextValue(i);
    }
    else
    {
      pointMap[i] = -1;
    }
  }

  outPD->AddArray(originalPtIds);
  originalPtIds->Delete();

  // outputDS must be either vtkPolyData or vtkUnstructuredGrid
  vtkPointSet::SafeDownCast(output)->SetPoints(newPts);
  newPts->Delete();
}

// Copy the cells marked as "in" using the given pointmap
template <class T>
void vtkExtractSelectedIdsCopyCells(vtkDataSet* input, T* output,
  signed char* inArray, vtkIdType* pointMap)
{
  vtkIdType numCells = input->GetNumberOfCells();
  output->Allocate(numCells / 4);

  vtkCellData* inCD = input->GetCellData();
  vtkCellData* outCD = output->GetCellData();
  outCD->SetCopyGlobalIds(1);
  outCD->CopyAllocate(inCD);

  vtkIdTypeArray* originalIds = vtkIdTypeArray::New();
  originalIds->SetNumberOfComponents(1);
  originalIds->SetName("vtkOriginalCellIds");

  vtkIdType i, j, newId = 0;
  vtkIdList* ptIds = vtkIdList::New();
  for (i = 0; i < numCells; i++)
  {
    if (inArray[i] > 0)
    {
      // special handling for polyhedron cells
      if (vtkUnstructuredGrid::SafeDownCast(input) &&
          vtkUnstructuredGrid::SafeDownCast(output) &&
          input->GetCellType(i) == VTK_POLYHEDRON)
      {
        ptIds->Reset();
        vtkUnstructuredGrid::SafeDownCast(input)->GetFaceStream(i, ptIds);
        vtkUnstructuredGrid::ConvertFaceStreamPointIds(ptIds, pointMap);
      }
      else
      {
        input->GetCellPoints(i, ptIds);
        for (j = 0; j < ptIds->GetNumberOfIds(); j++)
        {
          ptIds->SetId(j, pointMap[ptIds->GetId(j)]);
        }
      }
      output->InsertNextCell(input->GetCellType(i), ptIds);
      outCD->CopyData(inCD, i, newId++);
      originalIds->InsertNextValue(i);
    }
  }

  outCD->AddArray(originalIds);
  originalIds->Delete();
  ptIds->Delete();
}

namespace
{
  template <class T>
  void vtkESIDeepCopyImpl(T* out, T* in, int compno, int num_comps,
    vtkIdType numTuples)
  {
    if (compno < 0)
    {
      for (vtkIdType cc=0; cc < numTuples; cc++)
      {
        double mag = 0;
        for (int comp=0; comp < num_comps; comp++)
        {
          mag += in[comp]*in[comp];
        }
        mag = sqrt(mag);
        *out = static_cast<T>(mag);
        out++;
        in += num_comps;
      }
    }
    else
    {
      for (vtkIdType cc=0; cc < numTuples; cc++)
      {
        *out = in[compno];
        out++;
        in += num_comps;
      }
    }
  }

  void vtkESIDeepCopyImpl(vtkStdString* out, vtkStdString* in,
    int compno, int num_comps, vtkIdType numTuples)
  {
    if (compno < 0)
    {
      // we cannot compute magnitudes for string arrays!
      compno = 0;
    }
    for (vtkIdType cc=0; cc < numTuples; cc++)
    {
      *out = in[compno];
      out++;
      in += num_comps;
    }
  }

  // Deep copies a specified component (or magnitude of compno < 0).
  static void vtkESIDeepCopy(vtkAbstractArray* out, vtkAbstractArray* in, int compno)
  {
    if (in->GetNumberOfComponents() == 1)
    {
      //trivial case.
      out->DeepCopy(in);
      return;
    }

    vtkIdType numTuples = in->GetNumberOfTuples();
    out->SetNumberOfComponents(1);
    out->SetNumberOfTuples(numTuples);
    switch (in->GetDataType())
    {
      vtkTemplateMacro(
        vtkESIDeepCopyImpl<VTK_TT>(
          static_cast<VTK_TT*>(out->GetVoidPointer(0)),
          static_cast<VTK_TT*>(in->GetVoidPointer(0)),
          compno, in->GetNumberOfComponents(), numTuples));
    case VTK_STRING:
      vtkESIDeepCopyImpl(
        static_cast<vtkStdString*>(out->GetVoidPointer(0)),
        static_cast<vtkStdString*>(in->GetVoidPointer(0)),
        compno, in->GetNumberOfComponents(), numTuples);
      break;
    }
  }

  //---------------------
  template<class T1, class T2>
  void vtkExtractSelectedIdsExtractCells(
    vtkExtractSelectedIds *self, int passThrough, int invert,
    vtkDataSet *input, vtkIdTypeArray *idxArray,
    vtkSignedCharArray *cellInArray, vtkSignedCharArray *pointInArray,
    vtkIdType numIds, T1 *id, T2 *label)
  {
    // Reverse the "in" flag
    signed char flag = invert ? 1 : -1;
    flag = -flag;

    vtkIdType numCells = input->GetNumberOfCells();
    vtkIdType numPts = input->GetNumberOfPoints();
    vtkIdList *idList = vtkIdList::New();
    vtkIdList *ptIds = nullptr;
    char* cellCounter = nullptr;
    if (invert)
    {
      ptIds = vtkIdList::New();
      cellCounter = new char[numPts];
      for (vtkIdType i = 0; i < numPts; ++i)
      {
        cellCounter[i] = 0;
      }
    }

    vtkIdType idArrayIndex = 0, labelArrayIndex = 0;

    // Check each cell to see if it's selected
    while (labelArrayIndex < numCells)
    {
      // Advance through the selection ids until we find
      // one that's NOT LESS THAN the current cell label.
      bool idLessThanLabel = false;
      if (idArrayIndex < numIds)
      {
        idLessThanLabel =
          (id[idArrayIndex] < static_cast<T1>(label[labelArrayIndex]));
      }
      while ((idArrayIndex < numIds) && idLessThanLabel)
      {
        ++idArrayIndex;
        if (idArrayIndex >= numIds)
        {
          break;
        }
        idLessThanLabel =
          (id[idArrayIndex] < static_cast<T1>(label[labelArrayIndex]));
      }

      if (idArrayIndex >= numIds)
      {
        // We're out of selection ids, so we're done.
        break;
      }
      self->UpdateProgress(static_cast<double>(idArrayIndex) /
                           (numIds * (passThrough + 1)));

      // Advance through and mark all cells with a label EQUAL TO the
      // current selection id, as well as their points.
      bool idEqualToLabel =
        (id[idArrayIndex] == static_cast<T1>(label[labelArrayIndex]));
      while (idEqualToLabel)
      {
        vtkIdType cellId = idxArray->GetValue(labelArrayIndex);
        cellInArray->SetValue(cellId, flag);
        input->GetCellPoints(cellId, idList);
        if (!invert)
        {
          for (vtkIdType i = 0; i < idList->GetNumberOfIds(); ++i)
          {
            pointInArray->SetValue(idList->GetId(i), flag);
          }
        }
        else
        {
          for (vtkIdType i = 0; i < idList->GetNumberOfIds(); ++i)
          {
            vtkIdType ptId = idList->GetId(i);
            ptIds->InsertUniqueId(ptId);
            cellCounter[ptId]++;
          }
        }
        ++labelArrayIndex;
        if (labelArrayIndex >= numCells)
        {
          break;
        }
        idEqualToLabel =
          (id[idArrayIndex] == static_cast<T1>(label[labelArrayIndex]));
      }

      // Advance through cell labels until we find
      // one that's NOT LESS THAN the current selection id.
      bool labelLessThanId = false;
      if (labelArrayIndex < numCells)
      {
        labelLessThanId =
          (label[labelArrayIndex] < static_cast<T2>(id[idArrayIndex]));
      }
      while ((labelArrayIndex < numCells) && labelLessThanId)
      {
        ++labelArrayIndex;
        if (labelArrayIndex >= numCells)
        {
          break;
        }
        labelLessThanId =
          (label[labelArrayIndex] < static_cast<T2>(id[idArrayIndex]));
      }
    }

    if (invert)
    {
      for (vtkIdType i = 0; i < ptIds->GetNumberOfIds(); ++i)
      {
        vtkIdType ptId = ptIds->GetId(i);
        input->GetPointCells(ptId, idList);
        if (cellCounter[ptId] == idList->GetNumberOfIds())
        {
          pointInArray->SetValue(ptId, flag);
        }
      }

      ptIds->Delete();
      delete [] cellCounter;
    }

    idList->Delete();
  }

  //---------------------
  template<class T1>
  void vtkExtractSelectedIdsExtractCellsT1(
    vtkExtractSelectedIds *self, int passThrough, int invert,
    vtkDataSet *input, vtkIdTypeArray *idxArray,
    vtkSignedCharArray *cellInArray, vtkSignedCharArray *pointInArray,
    vtkIdType numIds, T1 *id, void *labelVoid, int labelArrayType)
  {
    switch (labelArrayType)
    {
      vtkTemplateMacro(
        vtkExtractSelectedIdsExtractCells(
          self, passThrough, invert, input,
          idxArray, cellInArray, pointInArray,
          numIds, id, static_cast<VTK_TT *>(labelVoid)));
    }
  }

  //---------------------
  template<class T1, class T2>
  void vtkExtractSelectedIdsExtractPoints(
    vtkExtractSelectedIds *self,
    int passThrough, int invert, int containingCells,
    vtkDataSet *input, vtkIdTypeArray *idxArray,
    vtkSignedCharArray *cellInArray, vtkSignedCharArray *pointInArray,
    vtkIdType numIds, T1 *id, T2 *label)
  {
    // Reverse the "in" flag
    signed char flag = invert ? 1 : -1;
    flag = -flag;

    vtkIdList *ptCells = nullptr;
    vtkIdList *cellPts = nullptr;
    if (containingCells)
    {
      ptCells = vtkIdList::New();
      cellPts = vtkIdList::New();
    }

    vtkIdType numPts = input->GetNumberOfPoints();
    vtkIdType idArrayIndex = 0, labelArrayIndex = 0;

    // Check each point to see if it's selected
    while (labelArrayIndex < numPts)
    {
      // Advance through the selection ids until we find
      // one that's NOT LESS THAN the current point label.
      bool idLessThanLabel = false;
      if (idArrayIndex < numIds)
      {
        idLessThanLabel =
          (id[idArrayIndex] < static_cast<T1>(label[labelArrayIndex]));
      }
      while ((idArrayIndex < numIds) && idLessThanLabel)
      {
        ++idArrayIndex;
        if (idArrayIndex >= numIds)
        {
          break;
        }
        idLessThanLabel =
          (id[idArrayIndex] < static_cast<T1>(label[labelArrayIndex]));
      }

      self->UpdateProgress(static_cast<double>(idArrayIndex) /
                           (numIds * (passThrough + 1)));
      if (idArrayIndex >= numIds)
      {
        // We're out of selection ids, so we're done.
        break;
      }

      // Advance through and mark all points with a label EQUAL TO the
      // current selection id, as well as their cells.
      bool idEqualToLabel =
        (id[idArrayIndex] == static_cast<T1>(label[labelArrayIndex]));
      while (idEqualToLabel)
      {
        vtkIdType ptId = idxArray->GetValue(labelArrayIndex);
        pointInArray->SetValue(ptId, flag);
        if (containingCells)
        {
          input->GetPointCells(ptId, ptCells);
          for (vtkIdType i = 0; i < ptCells->GetNumberOfIds(); ++i)
          {
            vtkIdType cellId = ptCells->GetId(i);
            if (!passThrough && !invert &&
                cellInArray->GetValue(cellId) != flag)
            {
              input->GetCellPoints(cellId, cellPts);
              for (vtkIdType j = 0; j < cellPts->GetNumberOfIds(); ++j)
              {
                pointInArray->SetValue(cellPts->GetId(j), flag);
              }
            }
            cellInArray->SetValue(cellId, flag);
          }
        }
        ++labelArrayIndex;
        if (labelArrayIndex >= numPts)
        {
          break;
        }
        idEqualToLabel =
          (id[idArrayIndex] == static_cast<T1>(label[labelArrayIndex]));
      }

      // Advance through point labels until we find
      // one that's NOT LESS THAN the current selection id.
      bool labelLessThanId = false;
      if (labelArrayIndex < numPts)
      {
        labelLessThanId =
          (label[labelArrayIndex] < static_cast<T2>(id[idArrayIndex]));
      }
      while ((labelArrayIndex < numPts) && labelLessThanId)
      {
        ++labelArrayIndex;
        if (labelArrayIndex >= numPts)
        {
          break;
        }
        labelLessThanId =
          (label[labelArrayIndex] < static_cast<T2>(id[idArrayIndex]));
      }
    }

    if (containingCells)
    {
      ptCells->Delete();
      cellPts->Delete();
    }
  }

  //---------------------
  template<class T1>
  void vtkExtractSelectedIdsExtractPointsT1(
    vtkExtractSelectedIds *self,
    int passThrough, int invert, int containingCells,
    vtkDataSet *input, vtkIdTypeArray *idxArray,
    vtkSignedCharArray *cellInArray, vtkSignedCharArray *pointInArray,
    vtkIdType numIds, T1 *id, void *labelVoid, int labelArrayType)
  {
    switch (labelArrayType)
    {
      vtkTemplateMacro(
        vtkExtractSelectedIdsExtractPoints(
          self, passThrough, invert, containingCells, input,
          idxArray, cellInArray, pointInArray,
          numIds, id, static_cast<VTK_TT *>(labelVoid)));
    }
  }

} // end anonymous namespace

//----------------------------------------------------------------------------
int vtkExtractSelectedIds::ExtractCells(
  vtkSelectionNode *sel,  vtkDataSet *input,
  vtkDataSet *output)
{
  int passThrough = 0;
  if (this->PreserveTopology)
  {
    passThrough = 1;
  }

  int invert = 0;
  if (sel->GetProperties()->Has(vtkSelectionNode::INVERSE()))
  {
    invert = sel->GetProperties()->Get(vtkSelectionNode::INVERSE());
  }

  vtkIdType i, numPts = input->GetNumberOfPoints();
  vtkSmartPointer<vtkSignedCharArray> pointInArray = vtkSmartPointer<vtkSignedCharArray>::New();
  pointInArray->SetNumberOfComponents(1);
  pointInArray->SetNumberOfTuples(numPts);
  signed char flag = invert ? 1 : -1;
  for (i=0; i < numPts; i++)
  {
    pointInArray->SetValue(i, flag);
  }

  vtkIdType numCells = input->GetNumberOfCells();
  vtkSmartPointer<vtkSignedCharArray> cellInArray = vtkSmartPointer<vtkSignedCharArray>::New();
  cellInArray->SetNumberOfComponents(1);
  cellInArray->SetNumberOfTuples(numCells);
  for (i=0; i < numCells; i++)
  {
    cellInArray->SetValue(i, flag);
  }

  if (passThrough)
  {
    output->ShallowCopy(input);
    pointInArray->SetName("vtkInsidedness");
    vtkPointData *outPD = output->GetPointData();
    outPD->AddArray(pointInArray);
    outPD->SetScalars(pointInArray);
    cellInArray->SetName("vtkInsidedness");
    vtkCellData *outCD = output->GetCellData();
    outCD->AddArray(cellInArray);
    outCD->SetScalars(cellInArray);
  }

  //decide what the IDS mean
  vtkAbstractArray *labelArray = nullptr;
  int selType = sel->GetProperties()->Get(vtkSelectionNode::CONTENT_TYPE());
  if (selType == vtkSelectionNode::GLOBALIDS)
  {
    labelArray = vtkArrayDownCast<vtkIdTypeArray>(
      input->GetCellData()->GetGlobalIds());
  }
  else if (selType == vtkSelectionNode::PEDIGREEIDS)
  {
    labelArray = input->GetCellData()->GetPedigreeIds();
  }
  else if (selType == vtkSelectionNode::VALUES &&
           sel->GetSelectionList()->GetName())
  {
    //user chose a specific label array
    labelArray = input->GetCellData()->GetAbstractArray(
        sel->GetSelectionList()->GetName());
  }

  if (labelArray == nullptr && selType != vtkSelectionNode::INDICES)
  {
    return 1;
  }

  vtkIdTypeArray *idxArray = vtkIdTypeArray::New();
  idxArray->SetNumberOfComponents(1);
  idxArray->SetNumberOfTuples(numCells);
  for (i=0; i < numCells; i++)
  {
    idxArray->SetValue(i, i);
  }

  if (labelArray)
  {
    int component_no = 0;
    if (sel->GetProperties()->Has(vtkSelectionNode::COMPONENT_NUMBER()))
    {
      component_no =
        sel->GetProperties()->Get(vtkSelectionNode::COMPONENT_NUMBER());
      if (component_no >= labelArray->GetNumberOfComponents())
      {
        component_no = 0;
      }
    }

    vtkAbstractArray* sortedArray =
      vtkAbstractArray::CreateArray(labelArray->GetDataType());
    vtkESIDeepCopy(sortedArray, labelArray, component_no);
    vtkSortDataArray::Sort(sortedArray, idxArray);
    labelArray = sortedArray;
  }
  else
  {
    //no global array, so just use the input cell index
    labelArray = idxArray;
    labelArray->Register(nullptr);
  }

  vtkIdType numIds = 0;
  vtkAbstractArray* idArray = sel->GetSelectionList();
  if (idArray)
  {
    numIds = idArray->GetNumberOfTuples();
    vtkAbstractArray* sortedArray =
      vtkAbstractArray::CreateArray(idArray->GetDataType());
    sortedArray->DeepCopy(idArray);
    vtkSortDataArray::SortArrayByComponent(sortedArray, 0);
    idArray = sortedArray;
  }

  if (idArray == nullptr)
  {
    labelArray->Delete();
    idxArray->Delete();
    return 1;
  }

  // Array types must match if they are string arrays.
  if (vtkArrayDownCast<vtkStringArray>(labelArray) &&
    vtkArrayDownCast<vtkStringArray>(idArray) == nullptr)
  {
    labelArray->Delete();
    idxArray->Delete();
    idArray->Delete();
    vtkWarningMacro(
      "Array types don't match. They must match for vtkStringArray.");
    return 0;
  }

  void *idVoid = idArray->GetVoidPointer(0);
  void *labelVoid = labelArray->GetVoidPointer(0);
  int idArrayType = idArray->GetDataType();
  int labelArrayType = labelArray->GetDataType();

  switch (idArrayType)
  {
    vtkTemplateMacro(
      vtkExtractSelectedIdsExtractCellsT1(
        this, passThrough, invert, input,
        idxArray, cellInArray, pointInArray, numIds,
        static_cast<VTK_TT *>(idVoid), labelVoid, labelArrayType));
    case VTK_STRING:
      vtkExtractSelectedIdsExtractCells(
        this, passThrough, invert, input,
        idxArray, cellInArray, pointInArray, numIds,
        static_cast<vtkStdString *>(idVoid),
        static_cast<vtkStdString *>(labelVoid));
  }

  idArray->Delete();
  idxArray->Delete();
  labelArray->Delete();

  if (!passThrough)
  {
    vtkIdType *pointMap = new vtkIdType[numPts]; // maps old point ids into new
    vtkExtractSelectedIdsCopyPoints(input, output,
      pointInArray->GetPointer(0), pointMap);
    this->UpdateProgress(0.75);
    if (output->GetDataObjectType() == VTK_POLY_DATA)
    {
      vtkExtractSelectedIdsCopyCells<vtkPolyData>(input,
        vtkPolyData::SafeDownCast(output),
        cellInArray->GetPointer(0), pointMap);
    }
    else
    {
      vtkExtractSelectedIdsCopyCells<vtkUnstructuredGrid>(input,
        vtkUnstructuredGrid::SafeDownCast(output),
        cellInArray->GetPointer(0), pointMap);
    }
    delete [] pointMap;
    this->UpdateProgress(1.0);
  }

  output->Squeeze();

  return 1;
}

//----------------------------------------------------------------------------
int vtkExtractSelectedIds::ExtractPoints(
  vtkSelectionNode *sel,  vtkDataSet *input,
  vtkDataSet *output)
{
  int passThrough = 0;
  if (this->PreserveTopology)
  {
    passThrough = 1;
  }

  int containingCells = 0;
  if (sel->GetProperties()->Has(vtkSelectionNode::CONTAINING_CELLS()))
  {
    containingCells = sel->GetProperties()->Get(vtkSelectionNode::CONTAINING_CELLS());
  }

  int invert = 0;
  if (sel->GetProperties()->Has(vtkSelectionNode::INVERSE()))
  {
    invert = sel->GetProperties()->Get(vtkSelectionNode::INVERSE());
  }

  vtkIdType i, numPts = input->GetNumberOfPoints();
  vtkSmartPointer<vtkSignedCharArray> pointInArray = vtkSmartPointer<vtkSignedCharArray>::New();
  pointInArray->SetNumberOfComponents(1);
  pointInArray->SetNumberOfTuples(numPts);
  signed char flag = invert ? 1 : -1;
  for (i=0; i < numPts; i++)
  {
    pointInArray->SetValue(i, flag);
  }

  vtkIdType numCells = input->GetNumberOfCells();
  vtkSmartPointer<vtkSignedCharArray> cellInArray;
  if (containingCells)
  {
    cellInArray = vtkSmartPointer<vtkSignedCharArray>::New();
    cellInArray->SetNumberOfComponents(1);
    cellInArray->SetNumberOfTuples(numCells);
    for (i=0; i < numCells; i++)
    {
     cellInArray->SetValue(i, flag);
    }
  }

 if (passThrough)
 {
    output->ShallowCopy(input);
    pointInArray->SetName("vtkInsidedness");
    vtkPointData *outPD = output->GetPointData();
    outPD->AddArray(pointInArray);
    outPD->SetScalars(pointInArray);
    if (containingCells)
    {
      cellInArray->SetName("vtkInsidedness");
      vtkCellData *outCD = output->GetCellData();
      outCD->AddArray(cellInArray);
      outCD->SetScalars(cellInArray);
    }
 }

  //decide what the IDS mean
  vtkAbstractArray *labelArray = nullptr;
  int selType = sel->GetProperties()->Get(vtkSelectionNode::CONTENT_TYPE());
  if (selType == vtkSelectionNode::GLOBALIDS)
  {
    labelArray = vtkArrayDownCast<vtkIdTypeArray>(
      input->GetPointData()->GetGlobalIds());
  }
  else if (selType == vtkSelectionNode::PEDIGREEIDS)
  {
    labelArray = input->GetPointData()->GetPedigreeIds();
  }
  else if (selType == vtkSelectionNode::VALUES &&
           sel->GetSelectionList()->GetName())
  {
    //user chose a specific label array
    labelArray = input->GetPointData()->GetAbstractArray(
      sel->GetSelectionList()->GetName());
  }
  if (labelArray == nullptr && selType != vtkSelectionNode::INDICES)
  {
    return 1;
  }

  vtkIdTypeArray *idxArray = vtkIdTypeArray::New();
  idxArray->SetNumberOfComponents(1);
  idxArray->SetNumberOfTuples(numPts);
  for (i=0; i < numPts; i++)
  {
    idxArray->SetValue(i, i);
  }

  if (labelArray)
  {
    int component_no = 0;
    if (sel->GetProperties()->Has(vtkSelectionNode::COMPONENT_NUMBER()))
    {
      component_no =
        sel->GetProperties()->Get(vtkSelectionNode::COMPONENT_NUMBER());
      if (component_no >= labelArray->GetNumberOfComponents())
      {
        component_no = 0;
      }
    }

    vtkAbstractArray* sortedArray =
      vtkAbstractArray::CreateArray(labelArray->GetDataType());
    vtkESIDeepCopy(sortedArray, labelArray, component_no);
    vtkSortDataArray::Sort(sortedArray, idxArray);
    labelArray = sortedArray;
  }
  else
  {
    //no global array, so just use the input cell index
    labelArray = idxArray;
    labelArray->Register(nullptr);
  }

  vtkIdType numIds = 0;
  vtkAbstractArray* idArray = sel->GetSelectionList();
  if (idArray == nullptr)
  {
    labelArray->Delete();
    idxArray->Delete();
    return 1;
  }

  // Array types must match if they are string arrays.
  if (vtkArrayDownCast<vtkStringArray>(labelArray) &&
    vtkArrayDownCast<vtkStringArray>(idArray) == nullptr)
  {
    vtkWarningMacro(
      "Array types don't match. They must match for vtkStringArray.");
    labelArray->Delete();
    idxArray->Delete();
    return 0;
  }

  numIds = idArray->GetNumberOfTuples();
  vtkAbstractArray* sortedArray =
    vtkAbstractArray::CreateArray(idArray->GetDataType());
  sortedArray->DeepCopy(idArray);
  vtkSortDataArray::SortArrayByComponent(sortedArray, 0);
  idArray = sortedArray;

  void *idVoid = idArray->GetVoidPointer(0);
  void *labelVoid = labelArray->GetVoidPointer(0);
  int idArrayType = idArray->GetDataType();
  int labelArrayType = labelArray->GetDataType();

  switch (idArrayType)
  {
    vtkTemplateMacro(
      vtkExtractSelectedIdsExtractPointsT1(
        this, passThrough, invert, containingCells, input,
        idxArray, cellInArray, pointInArray, numIds,
        static_cast<VTK_TT *>(idVoid), labelVoid, labelArrayType));
    case VTK_STRING:
      vtkExtractSelectedIdsExtractPoints(
        this, passThrough, invert, containingCells, input,
        idxArray, cellInArray, pointInArray, numIds,
        static_cast<vtkStdString *>(idVoid),
        static_cast<vtkStdString *>(labelVoid));
  }

  idArray->Delete();
  idxArray->Delete();
  labelArray->Delete();

  if (!passThrough)
  {
    vtkIdType *pointMap = new vtkIdType[numPts]; // maps old point ids into new
    vtkExtractSelectedIdsCopyPoints(input, output,
      pointInArray->GetPointer(0), pointMap);
    this->UpdateProgress(0.75);
    if (containingCells)
    {
      if (output->GetDataObjectType() == VTK_POLY_DATA)
      {
        vtkExtractSelectedIdsCopyCells<vtkPolyData>(input,
          vtkPolyData::SafeDownCast(output), cellInArray->GetPointer(0),
          pointMap);
      }
      else
      {
        vtkExtractSelectedIdsCopyCells<vtkUnstructuredGrid>(input,
          vtkUnstructuredGrid::SafeDownCast(output),
          cellInArray->GetPointer(0), pointMap);
      }
    }
    else
    {
      numPts = output->GetNumberOfPoints();
      if (output->GetDataObjectType() == VTK_POLY_DATA)
      {
        vtkPolyData* outputPD = vtkPolyData::SafeDownCast(output);
        vtkCellArray *newVerts = vtkCellArray::New();
        newVerts->Allocate(newVerts->EstimateSize(numPts,1));
        for (i = 0; i < numPts; ++i)
        {
          newVerts->InsertNextCell(1, &i);
        }
        outputPD->SetVerts(newVerts);
        newVerts->Delete();
      }
      else
      {
        vtkUnstructuredGrid* outputUG = vtkUnstructuredGrid::SafeDownCast(output);
        outputUG->Allocate(numPts);
        for (i = 0; i < numPts; ++i)
        {
          outputUG->InsertNextCell(VTK_VERTEX, 1, &i);
        }
      }
    }
      this->UpdateProgress(1.0);
      delete [] pointMap;
  }
  output->Squeeze();
  return 1;
}

//----------------------------------------------------------------------------
void vtkExtractSelectedIds::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

}
