/*=========================================================================
 *
 *  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.
 *
 *=========================================================================*/
// Test itk::ShapedFloodFilledImageFunctionConditionalConstIterator on a 2D
// image using the fully connected option.

#include "itkImageFileReader.h"
#include "itkBinaryThresholdImageFunction.h"

#include "itkShapedFloodFilledImageFunctionConditionalConstIterator.h"
#include "itkTestingMacros.h"

int
itkShapedFloodFilledImageFunctionConditionalConstIteratorTest1(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cerr << "Missing parameters." << std::endl;
    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv);
    std::cerr << " filename " << std::endl;
    return EXIT_FAILURE;
  }

  constexpr unsigned int ImageDimension = 2;
  using PixelType = unsigned char;

  using ImageType = itk::Image<PixelType, ImageDimension>;
  using RegionType = ImageType::RegionType;
  using IndexType = ImageType::IndexType;

  using FunctionType = itk::BinaryThresholdImageFunction<ImageType>;
  using ShapedFloodFilledIteratorType =
    itk::ShapedFloodFilledImageFunctionConditionalConstIterator<ImageType, FunctionType>;

  using ReaderType = itk::ImageFileReader<ImageType>;

  auto reader = ReaderType::New();
  reader->SetFileName(argv[1]);

  ITK_TRY_EXPECT_NO_EXCEPTION(reader->Update());


  IndexType index;
  index[0] = 29;
  index[1] = 47;

  std::vector<IndexType> seedList;
  seedList.push_back(index);

  RegionType region = reader->GetOutput()->GetBufferedRegion();

  auto function = FunctionType::New();

  function->SetInputImage(reader->GetOutput());
  function->ThresholdAbove(1); // >= 1

  ShapedFloodFilledIteratorType shapedFloodIt(reader->GetOutput(), function, seedList);
  shapedFloodIt.SetFullyConnected(true); // 8-connected, default
  //
  // get the seeds and display them.
  std::cout << "Iterator seeds";
  for (auto seed : shapedFloodIt.GetSeeds())
  {
    std::cout << ' ' << seed;
  }
  std::cout << std::endl;

  auto visitedImage = ImageType::New();
  visitedImage->SetRegions(region);
  visitedImage->Allocate(true); // initialize
                                // buffer to zero

  for (; !shapedFloodIt.IsAtEnd(); ++shapedFloodIt)
  {
    visitedImage->SetPixel(shapedFloodIt.GetIndex(), 255);
  }

  using ConstIteratorType = itk::ImageRegionConstIterator<ImageType>;

  ConstIteratorType inIt(reader->GetOutput(), region);
  ConstIteratorType outIt(visitedImage, region);

  for (; !inIt.IsAtEnd(); ++inIt, ++outIt)
  {
    if (inIt.Get() != outIt.Get())
    {
      return EXIT_FAILURE;
    }
  }

  return EXIT_SUCCESS;
}
