/*
 * 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.
 */

#ifndef otbRadiometricMomentsImageFilter_h
#define otbRadiometricMomentsImageFilter_h

#include "itkImageToImageFilter.h"
#include "otbRadiometricMomentsFunctor.h"
#include "itkConstNeighborhoodIterator.h"

namespace otb
{

/**
 * \class RadiometricMomentsImageFilter
 * \brief Calculate the radiometric moments.
 *
 * Calculate the radiometric moments over a specified neighborhood
 *
 * This class is templated over the input image and the output image.
 *
 * \ingroup ImageFilters
 *
 * \ingroup OTBMoments
 */


template <class TInputImage, class TOutputImage>
class ITK_EXPORT RadiometricMomentsImageFilter : public itk::ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  /** Standard class typedefs. */
  typedef RadiometricMomentsImageFilter Self;
  typedef itk::ImageToImageFilter<TInputImage, TOutputImage> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(RadiometricMomentsImageFilter, ImageToImageFilter);

  /** Some convenient typedefs. */
  typedef typename Superclass::InputImageType         InputImageType;
  typedef typename InputImageType::ConstPointer       InputImagePointer;
  typedef typename InputImageType::RegionType         InputImageRegionType;
  typedef typename InputImageType::PixelType          InputImagePixelType;
  typedef typename InputImageType::SizeType           InputImageSizeType;
  typedef typename Superclass::OutputImageType        OutputImageType;
  typedef typename OutputImageType::Pointer           OutputImagePointer;
  typedef typename OutputImageType::RegionType        OutputImageRegionType;
  typedef typename OutputImageType::PixelType         OutputImagePixelType;
  typedef typename OutputImageType::InternalPixelType ScalarType;

  typedef Functor::RadiometricMomentsFunctor<itk::ConstNeighborhoodIterator<InputImageType>, ScalarType> FunctorType;

  typedef itk::ProcessObject ProcessObjectType;

  /**Set/Get the radius of neighborhood.*/
  itkSetMacro(Radius, InputImageSizeType);
  itkGetMacro(Radius, InputImageSizeType);

  /** Set unsigned int radius */
  void SetRadius(unsigned int radius)
  {
    m_Radius.Fill(radius);
  }

  typedef itk::ConstNeighborhoodIterator<TInputImage>   NeighborhoodIteratorType;
  typedef typename NeighborhoodIteratorType::RadiusType RadiusType;
  typedef unsigned char                                 RadiusSizeType;

protected:
  RadiometricMomentsImageFilter();
  ~RadiometricMomentsImageFilter() override
  {
  }
  void ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread, itk::ThreadIdType threadId) override;
  void GenerateInputRequestedRegion(void) override;
  void GenerateOutputInformation(void) override;

private:
  RadiometricMomentsImageFilter(const Self&) = delete;
  void operator=(const Self&) = delete;

  InputImageSizeType m_Radius;
  FunctorType        m_Functor;
};

} // namespace otb

#ifndef OTB_MANUAL_INSTANTIATION
#include "otbRadiometricMomentsImageFilter.hxx"
#endif

#endif
