/*=========================================================================
 *
 *  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
 *
 *         http://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"

int
itkShapedFloodFilledImageFunctionConditionalConstIteratorTest1(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cerr << "Error: missing arguments" << std::endl;
    std::cerr << argv[0] << " filename " << std::endl;
    return EXIT_FAILURE;
  }

  try
  {
    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>;

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

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

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

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

    FunctionType::Pointer 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;

    ImageType::Pointer 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;
      }
    }
  }
  catch (const itk::ExceptionObject & e)
  {
    e.Print(std::cerr);
    return EXIT_FAILURE;
  }
  catch (...)
  {
    return EXIT_FAILURE;
  }

  return EXIT_SUCCESS;
}