/*=========================================================================
 *
 *  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 "itkRegionOfInterestImageFilter.h"
#include "itkSimpleFilterWatcher.h"
#include "itkTestingMacros.h"

int
itkRegionOfInterestImageFilterTest(int, char *[])
{

  constexpr unsigned int Dimension = 3;
  using PixelType = itk::Index<Dimension>;

  using ImageType = itk::Image<PixelType, Dimension>;

  using FilterType = itk::RegionOfInterestImageFilter<ImageType, ImageType>;


  using RegionType = ImageType::RegionType;
  using SizeType = ImageType::SizeType;
  using IndexType = ImageType::IndexType;
  using DirectionType = ImageType::DirectionType;

  using IteratorType = itk::ImageRegionIterator<ImageType>;

  auto filter = FilterType::New();

  ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, RegionOfInterestImageFilter, ImageToImageFilter);

  auto image = ImageType::New();

  IndexType start;
  start.Fill(0);

  SizeType size;
  size[0] = 40;
  size[1] = 40;
  size[2] = 40;

  RegionType region;
  region.SetIndex(start);
  region.SetSize(size);

  image->SetRegions(region);
  image->Allocate();

  DirectionType directions;
  directions.SetIdentity();
  directions[0][0] = 0.0;
  directions[1][0] = 1.0;
  directions[2][0] = 0.0;
  directions[0][1] = 1.0;
  directions[1][1] = 0.0;
  directions[2][1] = 0.0;
  image->SetDirection(directions);

  // Fill the image pixels with their own index.
  IteratorType intr(image, region);
  intr.GoToBegin();
  while (!intr.IsAtEnd())
  {
    intr.Set(intr.GetIndex());
    ++intr;
  }


  filter->SetInput(image);

  SizeType roiSize;
  roiSize[0] = 20;
  roiSize[1] = 20;
  roiSize[2] = 20;

  IndexType roiStart;
  roiStart[0] = 9;
  roiStart[1] = 9;
  roiStart[2] = 9;

  RegionType regionOfInterest;
  regionOfInterest.SetIndex(roiStart);
  regionOfInterest.SetSize(roiSize);

  itk::SimpleFilterWatcher watcher(filter);

  filter->SetRegionOfInterest(regionOfInterest);
  ITK_TEST_SET_GET_VALUE(regionOfInterest, filter->GetRegionOfInterest());

  filter->Update();

  IteratorType ot(filter->GetOutput(), filter->GetOutput()->GetLargestPossibleRegion());

  IteratorType it(image, regionOfInterest);

  it.GoToBegin();
  ot.GoToBegin();

  bool passed = true;
  while (!it.IsAtEnd())
  {
    IndexType inIndex = it.Get();
    IndexType outIndex = ot.Get();
    if (inIndex[0] != outIndex[0] || inIndex[1] != outIndex[1] || inIndex[2] != outIndex[2])
    {
      std::cerr << "Test failed at pixel " << inIndex << std::endl;
      std::cerr << "pixel value is       " << outIndex << std::endl;
      passed = false;
      break;
    }

    ++it;
    ++ot;
  }

  if (!passed)
  {
    return EXIT_FAILURE;
  }

  std::cout << "Test PASSED !" << std::endl;
  return EXIT_SUCCESS;
}
