/*
 * Copyright (C) 2005-2019 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 otbTwoNRIBandsImageToNComplexBandsImage_hxx
#define otbTwoNRIBandsImageToNComplexBandsImage_hxx

#include "otbTwoNRIBandsImageToNComplexBandsImage.h"

#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkProgressReporter.h"
#include "itkVariableLengthVector.h"


namespace otb
{

/**
 *
 */
template <class TInputImage, class TOutputImage>
TwoNRIBandsImageToNComplexBandsImage<TInputImage, TOutputImage>::TwoNRIBandsImageToNComplexBandsImage()
{
  // this->SetNumberOfThreads(1);
}

/**
 * GenerateOutputInformation
 */
template <class TInputImage, class TOutputImage>
void TwoNRIBandsImageToNComplexBandsImage<TInputImage, TOutputImage>::GenerateOutputInformation(void)
{
  Superclass::GenerateOutputInformation();

  unsigned int nbCompo = this->GetInput()->GetNumberOfComponentsPerPixel();

  if ((nbCompo % 2) != 0)
  {
    itkExceptionMacro("Number of bands of the input images must be an even number");
  }
  else
  {
    this->GetOutput()->SetNumberOfComponentsPerPixel(nbCompo / 2);
  }
}

/**
 * BeforeThreadedGenerateData
 */
template <class TInputImage, class TOutputImage>
void TwoNRIBandsImageToNComplexBandsImage<TInputImage, TOutputImage>::BeforeThreadedGenerateData(void)
{
  unsigned int nbCompo = this->GetInput()->GetNumberOfComponentsPerPixel();

  if ((nbCompo % 2) != 0)
    itkExceptionMacro("Number of bands of the input images must be an even number");
}

/**
 * ThreadedGenerateData
 */
template <class TInputImage, class TOutputImage>
void TwoNRIBandsImageToNComplexBandsImage<TInputImage, TOutputImage>::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
                                                                                           itk::ThreadIdType threadId)
{

  unsigned int nbCompo = this->GetInput()->GetNumberOfComponentsPerPixel();

  itk::VariableLengthVector<std::complex<typename InputPixelType::ValueType>> vlv(nbCompo / 2);


  // support progress methods/callbacks
  itk::ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());

  itk::ImageRegionConstIterator<TInputImage> inIt;
  inIt = itk::ImageRegionConstIterator<TInputImage>(this->GetInput(), outputRegionForThread);

  itk::ImageRegionIterator<OutputImageType> outIt;
  outIt = itk::ImageRegionIterator<OutputImageType>(this->GetOutput(), outputRegionForThread);


  inIt.GoToBegin();
  outIt.GoToBegin();

  while (!outIt.IsAtEnd())
  {

    unsigned int k = 0;
    for (unsigned int i = 0; i < nbCompo - 1; i = i + 2)
    {
      vlv[k] = std::complex<typename InputPixelType::ValueType>(inIt.Get()[i], inIt.Get()[i + 1]);
      k++;
    }


    outIt.Set(vlv);


    ++inIt;
    ++outIt;

    progress.CompletedPixel();
  }
}

/**
 * Standard "PrintSelf" method
 */
template <class TInputImage, class TOutput>
void TwoNRIBandsImageToNComplexBandsImage<TInputImage, TOutput>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
  Superclass::PrintSelf(os, indent);
}

} // end namespace otb

#endif