// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause

#include <vtkCellArray.h>
#include <vtkMinimalStandardRandomSequence.h>
#include <vtkSmartPointer.h>
#include <vtkSmoothPolyDataFilter.h>

namespace
{
void InitializePolyData(vtkPolyData* polyData, int dataType)
{
  vtkSmartPointer<vtkMinimalStandardRandomSequence> randomSequence =
    vtkSmartPointer<vtkMinimalStandardRandomSequence>::New();
  randomSequence->SetSeed(1);

  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
  vtkSmartPointer<vtkCellArray> verts = vtkSmartPointer<vtkCellArray>::New();
  verts->InsertNextCell(4);

  if (dataType == VTK_DOUBLE)
  {
    points->SetDataType(VTK_DOUBLE);
    for (unsigned int i = 0; i < 4; ++i)
    {
      double point[3];
      for (unsigned int j = 0; j < 3; ++j)
      {
        randomSequence->Next();
        point[j] = randomSequence->GetValue();
      }
      verts->InsertCellPoint(points->InsertNextPoint(point));
    }
  }
  else
  {
    points->SetDataType(VTK_FLOAT);
    for (unsigned int i = 0; i < 4; ++i)
    {
      float point[3];
      for (unsigned int j = 0; j < 3; ++j)
      {
        randomSequence->Next();
        point[j] = static_cast<float>(randomSequence->GetValue());
      }
      verts->InsertCellPoint(points->InsertNextPoint(point));
    }
  }

  points->Squeeze();
  polyData->SetPoints(points);
  verts->Squeeze();
  polyData->SetVerts(verts);
}

int SmoothPolyData(int dataType, int outputPointsPrecision)
{
  vtkSmartPointer<vtkPolyData> inputPolyData = vtkSmartPointer<vtkPolyData>::New();
  InitializePolyData(inputPolyData, dataType);

  vtkSmartPointer<vtkSmoothPolyDataFilter> smoothPolyDataFilter =
    vtkSmartPointer<vtkSmoothPolyDataFilter>::New();
  smoothPolyDataFilter->SetOutputPointsPrecision(outputPointsPrecision);
  smoothPolyDataFilter->SetInputData(inputPolyData);

  smoothPolyDataFilter->Update();

  vtkSmartPointer<vtkPolyData> outputPolyData = smoothPolyDataFilter->GetOutput();
  vtkSmartPointer<vtkPoints> points = outputPolyData->GetPoints();

  return points->GetDataType();
}
}

int TestSmoothPolyDataFilter(int vtkNotUsed(argc), char* vtkNotUsed(argv)[])
{
  int dataType = SmoothPolyData(VTK_FLOAT, vtkAlgorithm::DEFAULT_PRECISION);

  if (dataType != VTK_FLOAT)
  {
    return EXIT_FAILURE;
  }

  dataType = SmoothPolyData(VTK_DOUBLE, vtkAlgorithm::DEFAULT_PRECISION);

  if (dataType != VTK_DOUBLE)
  {
    return EXIT_FAILURE;
  }

  dataType = SmoothPolyData(VTK_FLOAT, vtkAlgorithm::SINGLE_PRECISION);

  if (dataType != VTK_FLOAT)
  {
    return EXIT_FAILURE;
  }

  dataType = SmoothPolyData(VTK_DOUBLE, vtkAlgorithm::SINGLE_PRECISION);

  if (dataType != VTK_FLOAT)
  {
    return EXIT_FAILURE;
  }

  dataType = SmoothPolyData(VTK_FLOAT, vtkAlgorithm::DOUBLE_PRECISION);

  if (dataType != VTK_DOUBLE)
  {
    return EXIT_FAILURE;
  }

  dataType = SmoothPolyData(VTK_DOUBLE, vtkAlgorithm::DOUBLE_PRECISION);

  if (dataType != VTK_DOUBLE)
  {
    return EXIT_FAILURE;
  }

  return EXIT_SUCCESS;
}
