/*=========================================================================
 *
 *  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.
 *
 *=========================================================================*/
#ifndef itkUnsharpMaskImageFilter_hxx
#define itkUnsharpMaskImageFilter_hxx

#include "itkBinaryGeneratorImageFilter.h"
#include "itkNumericTraits.h"
#include "itkProgressAccumulator.h"

namespace itk
{

template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::UnsharpMaskImageFilter()
  : m_Amount(0.5)
  , m_Threshold(0)
  , m_Clamp(std::is_integral_v<OutputPixelType>)
// clamping is on for integral types, and off for floating types
// this gives intuitive behavior for integral types
// and skips min/max checks for floating types
{
  m_Sigmas.Fill(1.0);
}

template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
void
UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::GenerateInputRequestedRegion()
{
  // call the superclass' implementation of this method. this should
  // copy the output requested region to the input requested region
  Superclass::GenerateInputRequestedRegion();

  // This filter needs all of the input
  const InputImagePointer image = const_cast<InputImageType *>(this->GetInput());
  if (image)
  {
    image->SetRequestedRegion(this->GetInput()->GetLargestPossibleRegion());
  }
}


template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
void
UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::VerifyPreconditions() const
{
  Superclass::VerifyPreconditions();
  if (m_Threshold < 0.0)
  {
    itkExceptionStringMacro("Threshold must be non-negative!");
  }
}


template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
void
UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::GenerateData()
{
  auto input = TInputImage::New();
  input->Graft(const_cast<TInputImage *>(this->GetInput()));
  auto gaussianF = GaussianType::New();
  gaussianF->SetInput(input);
  gaussianF->SetSigmaArray(m_Sigmas);
  gaussianF->SetNumberOfWorkUnits(this->GetNumberOfWorkUnits());

  using USMType = UnsharpMaskingFunctor<InputPixelType, TInternalPrecision, OutputPixelType>;
  using BinaryFunctorType =
    BinaryGeneratorImageFilter<TInputImage, typename GaussianType::OutputImageType, TOutputImage>;
  auto functorF = BinaryFunctorType::New();
  functorF->SetInput1(this->GetInput());
  functorF->SetInput2(gaussianF->GetOutput());
  const USMType usmT(m_Amount, m_Threshold, m_Clamp);
  functorF->SetFunctor(usmT);
  functorF->SetNumberOfWorkUnits(this->GetNumberOfWorkUnits());

  auto progress = ProgressAccumulator::New();
  progress->SetMiniPipelineFilter(this);
  progress->RegisterInternalFilter(gaussianF, 0.7);
  progress->RegisterInternalFilter(functorF, 0.3);

  functorF->GraftOutput(this->GetOutput());
  functorF->Update();
  this->GraftOutput(functorF->GetOutput());
}


template <typename TInputImage, typename TOutputImage, typename TInternalPrecision>
void
UnsharpMaskImageFilter<TInputImage, TOutputImage, TInternalPrecision>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "Sigmas: " << m_Sigmas << std::endl;
  os << indent << "Amount: " << m_Amount << std::endl;
  os << indent << "Threshold: " << m_Threshold << std::endl;
  os << indent << "Clamp: " << m_Clamp << std::endl;
}

} // end namespace itk

#endif
