/*
 * Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * 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
 *
 * 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 "itkMacro.h"
#include "otbImage.h"
#include "otbFunctionToImageFilter.h"
#include "itkVarianceImageFunction.h"
#include "otbImageFileReader.h"
#include "otbImageFileWriter.h"

int otbFunctionToImageFilter(int itkNotUsed(argc), char* argv[])
{
  const unsigned int Dimension = 2;
  typedef double     PixelType;
  typedef otb::Image<PixelType, Dimension> InputImageType;
  typedef otb::Image<PixelType, Dimension> OutputImageType;
  typedef otb::ImageFileReader<InputImageType>       ReaderType;
  typedef otb::ImageFileWriter<OutputImageType>      WriterType;
  typedef itk::VarianceImageFunction<InputImageType> FunctionType;
  typedef otb::FunctionToImageFilter<InputImageType, OutputImageType, FunctionType> FilterType;

  // Instantiating object
  FilterType::Pointer filter = FilterType::New();
  ReaderType::Pointer reader = ReaderType::New();
  WriterType::Pointer writer = WriterType::New();

  reader->SetFileName(argv[1]);
  writer->SetFileName(argv[2]);
  filter->SetInput(reader->GetOutput());

  FunctionType::Pointer function = FunctionType::New();
  function->SetNeighborhoodRadius(atoi(argv[3]));
  function->SetInputImage(reader->GetOutput());

  filter->SetFunction(function);

  writer->SetInput(filter->GetOutput());
  writer->SetNumberOfDivisionsStrippedStreaming(2);
  writer->Update();

  return EXIT_SUCCESS;
}
