/*=========================================================================
 *
 *  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 itkDoubleThresholdImageFilter_hxx
#define itkDoubleThresholdImageFilter_hxx

#include "itkReconstructionByDilationImageFilter.h"
#include "itkBinaryThresholdImageFilter.h"
#include "itkProgressAccumulator.h"

namespace itk
{
template <typename TInputImage, typename TOutputImage>
DoubleThresholdImageFilter<TInputImage, TOutputImage>::DoubleThresholdImageFilter()
  : m_Threshold1(NumericTraits<InputPixelType>::NonpositiveMin())
  , m_Threshold2(NumericTraits<InputPixelType>::NonpositiveMin())
  , m_Threshold3(NumericTraits<InputPixelType>::max())
  , m_Threshold4(NumericTraits<InputPixelType>::max())
  , m_InsideValue(NumericTraits<OutputPixelType>::max())
  , m_OutsideValue(OutputPixelType{})
{}

template <typename TInputImage, typename TOutputImage>
void
DoubleThresholdImageFilter<TInputImage, TOutputImage>::GenerateInputRequestedRegion()
{
  // call the superclass' implementation of this method
  Superclass::GenerateInputRequestedRegion();

  // We need all the input.
  const InputImagePointer input = const_cast<InputImageType *>(this->GetInput());
  if (input)
  {
    input->SetRequestedRegion(input->GetLargestPossibleRegion());
  }
}

template <typename TInputImage, typename TOutputImage>
void
DoubleThresholdImageFilter<TInputImage, TOutputImage>::EnlargeOutputRequestedRegion(DataObject *)
{
  this->GetOutput()->SetRequestedRegion(this->GetOutput()->GetLargestPossibleRegion());
}

template <typename TInputImage, typename TOutputImage>
void
DoubleThresholdImageFilter<TInputImage, TOutputImage>::GenerateData()
{
  // Allocate the output
  this->AllocateOutputs();

  // Build a mini-pipeline that involves two thresholds filters and a
  // geodesic dilation.
  using ThresholdFilterType = BinaryThresholdImageFilter<TInputImage, TOutputImage>;
  using DilationFilterType = ReconstructionByDilationImageFilter<TOutputImage, TOutputImage>;

  auto narrowThreshold = ThresholdFilterType::New();

  // Create a process accumulator for tracking the progress of this minipipeline
  auto progress = ProgressAccumulator::New();
  progress->SetMiniPipelineFilter(this);

  narrowThreshold->SetLowerThreshold(m_Threshold2);
  narrowThreshold->SetUpperThreshold(m_Threshold3);
  narrowThreshold->SetInsideValue(m_InsideValue);
  narrowThreshold->SetOutsideValue(m_OutsideValue);
  narrowThreshold->SetInput(this->GetInput());

  auto wideThreshold = ThresholdFilterType::New();
  wideThreshold->SetLowerThreshold(m_Threshold1);
  wideThreshold->SetUpperThreshold(m_Threshold4);
  wideThreshold->SetInsideValue(m_InsideValue);
  wideThreshold->SetOutsideValue(m_OutsideValue);
  wideThreshold->SetInput(this->GetInput());

  auto dilate = DilationFilterType::New();
  dilate->SetMarkerImage(narrowThreshold->GetOutput());
  dilate->SetMaskImage(wideThreshold->GetOutput());
  dilate->SetFullyConnected(m_FullyConnected);
  // dilate->RunOneIterationOff();   // run to convergence

  progress->RegisterInternalFilter(narrowThreshold, .1f);
  progress->RegisterInternalFilter(wideThreshold, .1f);
  progress->RegisterInternalFilter(dilate, .8f);

  // graft our output to the dilate filter to force the proper regions
  // to be generated
  dilate->GraftOutput(this->GetOutput());

  // reconstruction by dilation
  dilate->Update();

  // graft the output of the dilate filter back onto this filter's
  // output. this is needed to get the appropriate regions passed
  // back.
  this->GraftOutput(dilate->GetOutput());
}

template <typename TInputImage, typename TOutputImage>
void
DoubleThresholdImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);

  os << indent << "Threshold1: " << static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_Threshold1)
     << std::endl;
  os << indent << "Threshold2: " << static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_Threshold2)
     << std::endl;
  os << indent << "Threshold3: " << static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_Threshold3)
     << std::endl;
  os << indent << "Threshold4: " << static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_Threshold4)
     << std::endl;
  os << indent << "InsideValue: " << static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_InsideValue)
     << std::endl;
  os << indent << "OutsideValue: " << static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_OutsideValue)
     << std::endl;
  os << indent << "NumberOfIterationsUsed: " << m_NumberOfIterationsUsed << std::endl;
  itkPrintSelfBooleanMacro(FullyConnected);
}
} // end namespace itk
#endif
