/*=========================================================================
 *
 *  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 "itkCannyEdgeDetectionImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkSimpleFilterWatcher.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkMath.h"
#include "itkTestingMacros.h"


int
itkCannyEdgeDetectionImageFilterTest(int argc, char * argv[])
{
  if (argc < 3)
  {
    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " InputImage OutputImage" << std::endl;
    return EXIT_FAILURE;
  }

  constexpr unsigned int Dimension{ 2 };
  using InputPixelType = float;
  using InputImage = itk::Image<InputPixelType, Dimension>;
  using OutputPixelType = unsigned char;
  using OutputImage = itk::Image<OutputPixelType, Dimension>;
  using CannyEdgeDetectionImageFilterType = itk::CannyEdgeDetectionImageFilter<InputImage, InputImage>;


  const itk::ImageFileReader<InputImage>::Pointer reader = itk::ImageFileReader<InputImage>::New();
  reader->SetFileName(argv[1]);

  // Set up the filter
  auto filter = CannyEdgeDetectionImageFilterType::New();

  ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, CannyEdgeDetectionImageFilter, ImageToImageFilter);

  const itk::SimpleFilterWatcher watcher(filter);

  filter->SetInput(reader->GetOutput());

  constexpr CannyEdgeDetectionImageFilterType::OutputImagePixelType upperThreshold{ 30 };
  filter->SetUpperThreshold(upperThreshold);
  ITK_TEST_SET_GET_VALUE(upperThreshold, filter->GetUpperThreshold());

  constexpr CannyEdgeDetectionImageFilterType::OutputImagePixelType lowerThreshold{ 15 };
  filter->SetLowerThreshold(lowerThreshold);
  ITK_TEST_SET_GET_VALUE(lowerThreshold, filter->GetLowerThreshold());

  const CannyEdgeDetectionImageFilterType::ArrayType variance(1.0f);
  filter->SetVariance(variance);
  ITK_TEST_SET_GET_VALUE(variance, filter->GetVariance());

  const CannyEdgeDetectionImageFilterType::ArrayType maximumError(.01f);
  filter->SetMaximumError(maximumError);
  ITK_TEST_SET_GET_VALUE(maximumError, filter->GetMaximumError());


  const itk::RescaleIntensityImageFilter<InputImage, OutputImage>::Pointer rescale =
    itk::RescaleIntensityImageFilter<InputImage, OutputImage>::New();

  rescale->SetInput(filter->GetOutput());

  rescale->SetOutputMinimum(0);
  rescale->SetOutputMaximum(255);

  const itk::ImageFileWriter<OutputImage>::Pointer writer = itk::ImageFileWriter<OutputImage>::New();
  writer->SetInput(rescale->GetOutput());
  writer->SetFileName(argv[2]);

  ITK_TRY_EXPECT_NO_EXCEPTION(writer->Update());

  return EXIT_SUCCESS;
}
