/*
 * 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 otbNRIBandImagesToOneNComplexBandsImage_hxx
#define otbNRIBandImagesToOneNComplexBandsImage_hxx

#include "otbNRIBandImagesToOneNComplexBandsImage.h"

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


namespace otb
{

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

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

  unsigned int nbInputs = this->GetNumberOfInputs();
  this->GetOutput()->SetNumberOfComponentsPerPixel(nbInputs);
}

/**
 * BeforeThreadedGenerateData
 */
template <class TInputImage, class TOutputImage>
void NRIBandImagesToOneNComplexBandsImage<TInputImage, TOutputImage>::BeforeThreadedGenerateData(void)
{
  unsigned int nbInputs = this->GetNumberOfInputs();

  for (unsigned int i = 0; i < nbInputs; i++)
    if (this->GetInput(i)->GetNumberOfComponentsPerPixel() != 2)
      itkExceptionMacro("Input images must be made of two bands and only two (see input #" << i << ").");
}

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

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

  unsigned int nbInputs = this->GetNumberOfInputs();

  itk::VariableLengthVector<std::complex<typename InputPixelType::ValueType>> vlv(nbInputs);

  std::vector<typename itk::ImageRegionConstIterator<TInputImage>> vInIt;
  for (unsigned int i = 0; i < nbInputs; i++)
    vInIt.push_back(itk::ImageRegionConstIterator<TInputImage>(this->GetInput(i), outputRegionForThread));


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

  for (unsigned int i = 0; i < nbInputs; i++)
    vInIt[i].GoToBegin();
  outIt.GoToBegin();

  while (!outIt.IsAtEnd())
  {


    for (unsigned int i = 0; i < nbInputs; i++)
    {
      vlv[i] = std::complex<typename InputPixelType::ValueType>(vInIt[i].Get()[0], vInIt[i].Get()[1]);
      // std::cout << "i = " << i << " " << vInIt[i].Get()[0] << " " << vInIt[i].Get()[1] << std::endl;
    }


    outIt.Set(vlv);

    // std::cout << "outIt.Get() = " << outIt.Get() << std::endl;

    for (unsigned int i = 0; i < nbInputs; i++)
      ++vInIt[i];
    ++outIt;

    progress.CompletedPixel();
  }
}

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

} // end namespace otb

#endif