/*=========================================================================

  Program:   Advanced Normalization Tools

  Copyright (c) ConsortiumOfANTS. All rights reserved.
  See accompanying COPYING.txt or
 https://github.com/stnava/ANTs/blob/master/ANTSCopyright.txt for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/

#include "antsUtilities.h"
#include <algorithm>
#include <algorithm>
#include <iostream>
#include <fstream>
#include <cstdio>
#include "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkImageFileReader.h"
#include "itkCastImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"

namespace ants
{
template <unsigned int ImageDimension>
int
ConvertType(int argc, char * argv[])
{
  using outPixelType = unsigned char;
  using floatPixelType = float;
  using inPixelType = float;
  using ImageType = itk::Image<inPixelType, ImageDimension>;
  using IntermediateType = itk::Image<floatPixelType, ImageDimension>;
  using OutImageType = itk::Image<outPixelType, ImageDimension>;
  using readertype = itk::ImageFileReader<ImageType>;
  using writertype = itk::ImageFileWriter<OutImageType>;

  typename readertype::Pointer reader = readertype::New();
  if (argc < 2)
  {
    std::cout << "Missing input filename" << std::endl;
    throw;
  }
  reader->SetFileName(argv[1]);
  reader->Update();
  std::cout << " Updated reader " << std::endl;

  using castertype = itk::CastImageFilter<ImageType, IntermediateType>;
  typename castertype::Pointer caster = castertype::New();
  caster->SetInput(reader->GetOutput());
  caster->Update();

  // Rescale the image intensities so that they fall between 0 and 255
  using FilterType = itk::RescaleIntensityImageFilter<IntermediateType, IntermediateType>;
  typename FilterType::Pointer fixedrescalefilter = FilterType::New();
  fixedrescalefilter->SetInput(caster->GetOutput());
  constexpr double desiredMinimum = 0.0;
  constexpr double desiredMaximum = 255.0;
  fixedrescalefilter->SetOutputMinimum(desiredMinimum);
  fixedrescalefilter->SetOutputMaximum(desiredMaximum);
  fixedrescalefilter->UpdateLargestPossibleRegion();

  using castertype2 = itk::CastImageFilter<IntermediateType, OutImageType>;
  typename castertype2::Pointer caster2 = castertype2::New();
  caster2->SetInput(fixedrescalefilter->GetOutput());
  caster2->Update();

  typename OutImageType::Pointer     outim = caster2->GetOutput();
  typename OutImageType::SpacingType spc = outim->GetSpacing();
  outim->SetSpacing(spc);
  std::cout << " Dire in " << reader->GetOutput()->GetDirection() << std::endl;
  std::cout << " Dire out " << outim->GetDirection() << std::endl;
  typename writertype::Pointer writer = writertype::New();
  if (argc < 3)
  {
    std::cout << "Missing output filename" << std::endl;
    throw;
  }
  writer->SetFileName(argv[2]);
  writer->SetInput(outim);
  writer->Update();
  writer->Write();
  return EXIT_SUCCESS;
}

// entry point for the library; parameter 'args' is equivalent to 'argv' in (argc,argv) of commandline parameters to
// 'main()'
int
ConvertToJpg(std::vector<std::string> args, std::ostream * /*out_stream = nullptr */)
{
  try
  {
    // put the arguments coming in as 'args' into standard (argc,argv) format;
    // 'args' doesn't have the command name as first, argument, so add it manually;
    // 'args' may have adjacent arguments concatenated into one argument,
    // which the parser should handle
    args.insert(args.begin(), "ConvertToJpg");
    int     argc = args.size();
    char ** argv = new char *[args.size() + 1];
    for (unsigned int i = 0; i < args.size(); ++i)
    {
      // allocate space for the string plus a null character
      argv[i] = new char[args[i].length() + 1];
      std::strncpy(argv[i], args[i].c_str(), args[i].length());
      // place the null character in the end
      argv[i][args[i].length()] = '\0';
    }
    argv[argc] = nullptr;
    // class to automatically cleanup argv upon destruction
    class Cleanup_argv
    {
    public:
      Cleanup_argv(char ** argv_, int argc_plus_one_)
        : argv(argv_)
        , argc_plus_one(argc_plus_one_)
      {}

      ~Cleanup_argv()
      {
        for (unsigned int i = 0; i < argc_plus_one; ++i)
        {
          delete[] argv[i];
        }
        delete[] argv;
      }

    private:
      char **      argv;
      unsigned int argc_plus_one;
    };
    Cleanup_argv cleanup_argv(argv, argc + 1);

    // antscout->set_stream( out_stream );

    if (argc < 3)
    {
      std::cout << "Usage:   ConvertToJpg infile.nii out.jpg " << std::endl;
      if (argc >= 2 && (std::string(argv[1]) == std::string("--help") || std::string(argv[1]) == std::string("-h")))
      {
        return EXIT_SUCCESS;
      }
      return EXIT_FAILURE;
    }

    // Get the image dimension
    std::string               fn = std::string(argv[1]);
    itk::ImageIOBase::Pointer imageIO = itk::ImageIOFactory::CreateImageIO(fn.c_str(), itk::IOFileModeEnum::ReadMode);
    imageIO->SetFileName(fn.c_str());
    imageIO->ReadImageInformation();

    switch (imageIO->GetNumberOfDimensions())
    {
      case 2:
      {
        ConvertType<2>(argc, argv);
      }
      break;
      case 3:
      {
        ConvertType<3>(argc, argv);
      }
      break;
      default:
        std::cout << "Unsupported dimension" << std::endl;
        return EXIT_FAILURE;
    }
  }
  catch (const itk::ExceptionObject & e)
  {
    e.Print(std::cerr);
    return EXIT_FAILURE;
  }
  catch (const std::exception & e)
  {
    std::cerr << e.what() << std::endl;
    return EXIT_FAILURE;
  }
  catch (...)
  {
    std::cerr << "Unknown exception caught" << std::endl;
    return EXIT_FAILURE;
  }
  return EXIT_SUCCESS;
}
} // namespace ants
