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

  Program:   Visualization Toolkit
  Module:    vtkCountVertices.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 "vtkCountVertices.h"

#include "vtkCellData.h"
#include "vtkCellIterator.h"
#include "vtkDataSet.h"
#include "vtkIdTypeArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"

vtkStandardNewMacro(vtkCountVertices)

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

  os << indent << "OutputArrayName: "
     << (this->OutputArrayName ? this->OutputArrayName : "(nullptr)") << "\n";
}

//------------------------------------------------------------------------------
vtkCountVertices::vtkCountVertices()
  : OutputArrayName(nullptr)
{
  this->SetOutputArrayName("Vertex Count");
}

//------------------------------------------------------------------------------
vtkCountVertices::~vtkCountVertices()
{
  this->SetOutputArrayName(nullptr);
}

//------------------------------------------------------------------------------
int vtkCountVertices::RequestData(vtkInformation *,
                                  vtkInformationVector **inInfoVec,
                                  vtkInformationVector *outInfoVec)
{
  // get the info objects
  vtkInformation *inInfo = inInfoVec[0]->GetInformationObject(0);
  vtkInformation *outInfo = outInfoVec->GetInformationObject(0);

  // get the input and output
  vtkDataSet *input = vtkDataSet::SafeDownCast(
        inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataSet *output = vtkDataSet::SafeDownCast(
        outInfo->Get(vtkDataObject::DATA_OBJECT()));

  assert(input && output);

  output->ShallowCopy(input);

  vtkNew<vtkIdTypeArray> vertCount;
  vertCount->Allocate(input->GetNumberOfCells());
  vertCount->SetName(this->OutputArrayName);
  output->GetCellData()->AddArray(vertCount);

  vtkCellIterator *it = input->NewCellIterator();
  for (it->InitTraversal(); !it->IsDoneWithTraversal(); it->GoToNextCell())
  {
    vertCount->InsertNextValue(it->GetNumberOfPoints());
  }
  it->Delete();

  return 1;
}

//------------------------------------------------------------------------------
int vtkCountVertices::FillOutputPortInformation(int, vtkInformation *info)
{
  info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkDataSet");
  return 1;
}

//------------------------------------------------------------------------------
int vtkCountVertices::FillInputPortInformation(int, vtkInformation *info)
{
  info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
  return 1;
}
