/*
 * 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 otbStreamingResampleImageFilter_hxx
#define otbStreamingResampleImageFilter_hxx

#include "otbStreamingResampleImageFilter.h"
#include "itkProgressAccumulator.h"
#include "otbImage.h"

namespace otb
{

template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::StreamingResampleImageFilter()
{
  // internal filters instantiation
  m_DisplacementFilter  = DisplacementFieldGeneratorType::New();
  m_WarpFilter          = WarpImageFilterType::New();
  m_SignedOutputSpacing = m_DisplacementFilter->GetOutputSpacing();
  // Initialize the displacement field spacing to zero : inconsistent
  // value
  this->SetDisplacementFieldSpacing(itk::NumericTraits<SpacingType>::ZeroValue());

  // Wire minipipeline
  m_WarpFilter->SetDisplacementField(m_DisplacementFilter->GetOutput());
}

template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
void StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::GenerateData()
{
  // Set up progress reporting
  typename itk::ProgressAccumulator::Pointer progress = itk::ProgressAccumulator::New();
  progress->SetMiniPipelineFilter(this);
  progress->RegisterInternalFilter(m_WarpFilter, 1.f);

  m_WarpFilter->GraftOutput(this->GetOutput());
  m_WarpFilter->UpdateOutputData(m_WarpFilter->GetOutput());
  this->GraftOutput(m_WarpFilter->GetOutput());
}

/**
 *
 */
template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
void StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::GenerateOutputInformation()
{
  // check the output spacing of the displacement field
  if (this->GetDisplacementFieldSpacing() == itk::NumericTraits<SpacingType>::ZeroValue())
  {
    this->SetDisplacementFieldSpacing(2. * this->GetOutputSpacing());
  }

  // Retrieve output largest region
  SizeType largestSize = this->GetOutputSize();

  // Set up displacement field filter
  SizeType displacementFieldLargestSize;

  for (unsigned int dim = 0; dim < InputImageType::ImageDimension; ++dim)
  {
    // std::ceil to avoid numerical problems due to division of
    // spacings
    // + 1 :  We need to enlarge the displacement field size cause
    // itk::WarpImageFilter::EvaluateDisplacementAtPhysicalPoint needs
    // 4 neighbors and in the edges we can need 1 neighbor pixel
    // outside the field
    displacementFieldLargestSize[dim] =
        static_cast<unsigned int>(std::ceil(largestSize[dim] * std::abs(this->GetOutputSpacing()[dim] / this->GetDisplacementFieldSpacing()[dim]))) + 1;
  }
  m_DisplacementFilter->SetOutputSize(displacementFieldLargestSize);
  m_DisplacementFilter->SetOutputIndex(this->GetOutputStartIndex());

  m_WarpFilter->SetInput(this->GetInput());
  m_WarpFilter->GraftOutput(this->GetOutput());
  m_WarpFilter->UpdateOutputInformation();
  this->GraftOutput(m_WarpFilter->GetOutput());
}

template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
void StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::PropagateRequestedRegion(itk::DataObject* output)
{
  if (this->m_Updating)
    return;

  m_WarpFilter->GetOutput()->SetRequestedRegion(output);
  m_WarpFilter->GetOutput()->PropagateRequestedRegion();
}

/**
 * Method used to copy the parameters of the input image
 *
 */
template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
void StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::SetOutputParametersFromImage(const ImageBaseType* image)
{
  this->SetOutputOrigin(image->GetOrigin());
  this->SetOutputSpacing(internal::GetSignedSpacing(image));
  this->SetOutputStartIndex(image->GetLargestPossibleRegion().GetIndex());
  this->SetOutputSize(image->GetLargestPossibleRegion().GetSize());
}

template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
void StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::SetDisplacementFieldSpacing(SpacingType outputSpacing)
{
  m_SignedOutputSpacing                         = outputSpacing;
  typename TInputImage::DirectionType direction = this->m_DisplacementFilter->GetOutputDirection();
  for (unsigned int i = 0; i < TInputImage::ImageDimension; ++i)
  {
    if (outputSpacing[i] < 0)
    {
      if (direction[i][i] > 0)
      {
        for (unsigned int j = 0; j < TInputImage::ImageDimension; ++j)
        {
          direction[j][i] = -direction[j][i];
        }
      }
      outputSpacing[i] = -outputSpacing[i];
    }
  }
  this->m_DisplacementFilter->SetOutputSpacing(outputSpacing);
  this->m_DisplacementFilter->SetOutputDirection(direction);
  this->Modified();
}

template <class TInputImage, class TOutputImage, class TInterpolatorPrecisionType>
void StreamingResampleImageFilter<TInputImage, TOutputImage, TInterpolatorPrecisionType>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "OutputOrigin: " << this->GetOutputOrigin() << std::endl;
  os << indent << "OutputSpacing: " << this->GetOutputSpacing() << std::endl;
  os << indent << "OutputStartIndex: " << this->GetOutputStartIndex() << std::endl;
  os << indent << "OutputSize: " << this->GetOutputSize() << std::endl;
}
}
#endif
