/*=========================================================================
 *
 *  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 "itkThreadedImageRegionPartitioner.h"
#include "itkTestingMacros.h"

/*
 * Main test entry function
 */
int
itkThreadedImageRegionPartitionerTest(int, char *[])
{
  constexpr unsigned int Dimension = 2;

  using ThreadedImageRegionPartitionerType = itk::ThreadedImageRegionPartitioner<Dimension>;
  ThreadedImageRegionPartitionerType::Pointer threadedImageRegionPartitioner =
    ThreadedImageRegionPartitionerType::New();

  ITK_EXERCISE_BASIC_OBJECT_METHODS(
    threadedImageRegionPartitioner, ThreadedImageRegionPartitioner, ThreadedDomainPartitioner);


  using ImageRegionType = ThreadedImageRegionPartitionerType::DomainType;

  using SizeType = ImageRegionType::SizeType;
  using IndexType = ImageRegionType::IndexType;

  SizeType  size;
  IndexType index;

  size.Fill(97);
  index.Fill(4);

  ImageRegionType completeRegion;

  completeRegion.SetSize(size);
  completeRegion.SetIndex(index);

  // Define the expected results
  ImageRegionType              expectedRegion;
  std::vector<ImageRegionType> expectedSubRegions;
  size[1] = 25;
  expectedRegion.SetIndex(index);
  expectedRegion.SetSize(size);
  expectedSubRegions.push_back(expectedRegion);

  index[1] = 29;
  expectedRegion.SetIndex(index);
  expectedSubRegions.push_back(expectedRegion);

  index[1] = 54;
  expectedRegion.SetIndex(index);
  expectedSubRegions.push_back(expectedRegion);

  index[1] = 79;
  expectedRegion.SetIndex(index);
  size[1] = 22;
  expectedRegion.SetSize(size);
  expectedSubRegions.push_back(expectedRegion);

  constexpr itk::ThreadIdType totalThreads = 4;
  ImageRegionType             subRegion;
  for (itk::ThreadIdType i = 0; i < totalThreads; ++i)
  {
    threadedImageRegionPartitioner->PartitionDomain(i, totalThreads, completeRegion, subRegion);
    std::cout << "The resulting subregion for thread: " << i << " is : " << subRegion << std::endl;

    if (expectedSubRegions[i] != subRegion)
    {
      std::cerr << "The calculated sub-region, " << subRegion
                << " did not match the expected region: " << expectedSubRegions[i] << std::endl;
      return EXIT_FAILURE;
    }
  }

  return EXIT_SUCCESS;
}
