/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include <iostream>
#include "itkSparseFieldFourthOrderLevelSetImageFilter.h"
#include "itkImplicitManifoldNormalVectorFilter.h"
#include "itkNormalVectorDiffusionFunction.h"

int
itkImplicitManifoldNormalVectorFilterTest(int, char *[])
{
  using InputImageType = itk::Image<float, 2>;
  using NodeType = itk::NormalBandNode<InputImageType>;
  using OutputImageType = itk::SparseImage<NodeType, 2>;
  using FilterType = itk::ImplicitManifoldNormalVectorFilter<InputImageType, OutputImageType>;
  using FunctionType = itk::NormalVectorDiffusionFunction<OutputImageType>;

  auto                               im_init = InputImageType::New();
  constexpr InputImageType::SizeType sz{ 50, 50 };
  InputImageType::RegionType         r{ sz };
  im_init->SetRegions(r);
  im_init->Allocate();

  InputImageType::IndexType index;
  for (index[0] = 0; index[0] < 50; index[0]++)
    for (index[1] = 0; index[1] < 50; index[1]++)
    {
      im_init->SetPixel(index, static_cast<float>(index[0]));
    }

  auto filter = FilterType::New();
  auto function = FunctionType::New();
  filter->SetInput(im_init);
  filter->SetNormalFunction(function);
  filter->SetIsoLevelLow(15.0);
  filter->SetIsoLevelHigh(35.0);
  filter->SetMaxIteration(100);
  filter->SetMinVectorNorm(0.001);

  std::cout << "Max iteration = " << (filter->GetMaxIteration()) << '\n';
  std::cout << "IsoLevelLow = " << (filter->GetIsoLevelLow()) << '\n';
  std::cout << "IsoLevelHigh = " << (filter->GetIsoLevelHigh()) << '\n';
  std::cout << "MinVectorNorm = " << (filter->GetMinVectorNorm()) << '\n';
  std::cout << "UnsharpMaskingFlag = " << (filter->GetUnsharpMaskingFlag()) << '\n';
  std::cout << "UnsharpMaskingWeight = " << (filter->GetUnsharpMaskingWeight()) << '\n';
  std::cout << "Precomputeflag = " << (filter->GetPrecomputeFlag()) << '\n';

  filter->Print(std::cout);
  function->Print(std::cout);
  try
  {
    filter->Update();
  }
  catch (const itk::ExceptionObject & e)
  {
    std::cerr << e << std::endl;
  }

  return EXIT_SUCCESS;
}
