/*=========================================================================
 *
 *  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 "itkFastIncrementalBinaryDilateImageFilter.h"
#include "itkBinaryCrossStructuringElement.h"
#include "itkTestingMacros.h"

int
itkFastIncrementalBinaryDilateImageFilterTest(int, char *[])
{
  unsigned int i = 0;

  // Define the dimension of the images
  constexpr unsigned int myDimension{ 2 };

  // Define the values of the input images
  constexpr unsigned short fgValue{ 1 };
  constexpr unsigned short bgValue{ 0 };

  // Declare the types of the images
  using myImageType = itk::Image<unsigned short, myDimension>;

  // Declare the type of the size
  using mySizeType = itk::Size<myDimension>;

  // Declare the type of the Region
  using myRegionType = itk::ImageRegion<myDimension>;

  // Create an image
  auto inputImage = myImageType::New();

  // Define their size and region
  auto size = mySizeType::Filled(20);

  const myRegionType region{ size };

  // Initialize Image
  inputImage->SetRegions(region);
  inputImage->Allocate();

  // Declare Iterator types appropriate for each image
  using myIteratorType = itk::ImageRegionIterator<myImageType>;

  // Create one iterator for image (this is a light object)
  myIteratorType it(inputImage, inputImage->GetBufferedRegion());

  // Initialize the content of Image
  std::cout << "Input image " << std::endl;
  inputImage->FillBuffer(bgValue);

  myImageType::IndexType ind;
  ind[0] = 10;
  ind[1] = 10;
  inputImage->SetPixel(ind, fgValue);

  ind[0] = 0;
  ind[1] = 0;
  inputImage->SetPixel(ind, fgValue);
  ind[0] = 19;
  ind[1] = 0;
  inputImage->SetPixel(ind, fgValue);
  ind[0] = 19;
  ind[1] = 19;
  inputImage->SetPixel(ind, fgValue);
  ind[0] = 0;
  ind[1] = 19;
  inputImage->SetPixel(ind, fgValue);

  ind[0] = 0;
  ind[1] = 10;
  inputImage->SetPixel(ind, fgValue);
  ind[0] = 10;
  ind[1] = 0;
  inputImage->SetPixel(ind, fgValue);
  ind[0] = 19;
  ind[1] = 10;
  inputImage->SetPixel(ind, fgValue);
  ind[0] = 10;
  ind[1] = 19;
  inputImage->SetPixel(ind, fgValue);

  it.GoToBegin();
  while (!it.IsAtEnd())
  {
    std::cout << it.Get() << "  ";
    ++it;

    if (++i % size[0] == 0)
    {
      std::cout << std::endl;
    }
  }

  // Declare the type for the structuring element
  using myKernelType = itk::BinaryCrossStructuringElement<unsigned short, myDimension>;

  // Declare the type for the morphology Filter
  using myFilterType = itk::FastIncrementalBinaryDilateImageFilter<myImageType, myImageType, myKernelType>;

  // Create the filter
  auto filter = myFilterType::New();

  ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, FastIncrementalBinaryDilateImageFilter, BinaryDilateImageFilter);


  // Create the structuring element
  myKernelType cross;
  cross.CreateStructuringElement();

  // Connect the input image
  filter->SetInput(inputImage);
  ITK_TEST_SET_GET_VALUE(inputImage, filter->GetInput());

  filter->SetKernel(cross);
  ITK_TEST_SET_GET_VALUE(cross, filter->GetKernel());

  filter->SetDilateValue(fgValue);
  ITK_TEST_SET_GET_VALUE(fgValue, filter->GetDilateValue());

  // Get the Smart Pointer to the Filter Output
  const myImageType::Pointer outputImage = filter->GetOutput();

  // Execute the filter
  ITK_TRY_EXPECT_NO_EXCEPTION(filter->Update());


  // Create an iterator for going through the image output
  myIteratorType it2(outputImage, outputImage->GetBufferedRegion());

  // Print the content of the result image
  std::cout << "Result with cross radius 1 (default)" << std::endl;
  i = 0;
  it2.GoToBegin();
  while (!it2.IsAtEnd())
  {
    std::cout << it2.Get() << "  ";
    ++it2;

    if (++i % 20 == 0)
    {
      std::cout << std::endl;
    }
  }

  // Now try dilation with a cross of higher radius.
  cross.SetRadius(2);
  cross.CreateStructuringElement();

  filter->SetKernel(cross);
  filter->Modified();

  // Execute the filter
  ITK_TRY_EXPECT_NO_EXCEPTION(filter->Update());


  // Set the iterator for going through the image output
  it2.SetRegion(outputImage->GetBufferedRegion());

  // Print the content of the result image
  std::cout << "Result with cross radius 2" << std::endl;
  i = 0;
  it2.GoToBegin();
  while (!it2.IsAtEnd())
  {
    std::cout << it2.Get() << "  ";
    ++it2;

    if (++i % 20 == 0)
    {
      std::cout << std::endl;
    }
  }

  // All objects should be automatically destroyed at this point

  std::cout << "Test finished." << std::endl;
  return EXIT_SUCCESS;
}
