/*=========================================================================
 *
 *  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 itkNiftiImageIOTest_h
#define itkNiftiImageIOTest_h


#include "itkImageFileReader.h"
#include "itkImage.h"
#include "itkVectorImage.h"
#include "itksys/SystemTools.hxx"
#include "itkImageRegionIterator.h"
#include "itkImageFileWriter.h"
#include "itkImageIOFactory.h"
#include "itkNiftiImageIOFactory.h"
#include "itkNiftiImageIO.h"
#include "itkMetaDataObject.h"
#include "itkIOCommon.h"
#include "itkSpatialOrientationAdapter.h"
#include "itkDiffusionTensor3D.h"
#include "itkAffineTransform.h"
#include "itkVector.h"
#include "itkRGBAPixel.h"
#include "itkRandomImageSource.h"

#include "vnl/vnl_random.h"
#include "itkMath.h"

#include "nifti1_io.h"

#include <cstring>
#include <iostream>
#include <fstream>
#include <cstdio>

#include "itkIOTestHelper.h"

constexpr unsigned char RPI = 16;      /*Bit pattern 0 0 0  10000*/
constexpr unsigned char LEFT = 128;    /*Bit pattern 1 0 0  00000*/
constexpr unsigned char ANTERIOR = 64; /*Bit pattern 0 1 0  00000*/
constexpr unsigned char SUPERIOR = 32; /*Bit pattern 0 0 1  00000*/

// Specializations of this function template are only implemented for 1D to 4D (defined in the cxx file).
template <unsigned int TDimension>
typename itk::ImageBase<TDimension>::DirectionType
PreFillDirection();

template <typename T>
int
MakeNiftiImage()
{
  using ImageType = itk::Image<T, 3>;
  const char * filename = "test.nii";
  // Allocate Images
  enum
  {
    ImageDimension = ImageType::ImageDimension
  };
  const typename ImageType::SizeType size = { { 10, 10, 10 } };
  typename ImageType::SpacingType    spacing;
  spacing[0] = spacing[1] = spacing[2] = 1.0;

  const typename ImageType::IndexType index = { { 0, 0, 0 } };
  typename ImageType::RegionType      region(index, size);
  {
    typename ImageType::Pointer img = itk::IOTestHelper::AllocateImageFromRegionAndSpacing<ImageType>(region, spacing);

    { // Fill in entire image
      itk::ImageRegionIterator<ImageType> ri(img, region);
      try
      {
        while (!ri.IsAtEnd())
        {
          ri.Set(RPI);
          ++ri;
        }
      }
      catch (const itk::ExceptionObject & ex)
      {
        std::cerr << "Error filling array" << ex << std::endl;
        return EXIT_FAILURE;
      }
    }

    typename ImageType::RegionType      RPIregion;
    itk::ImageRegionIterator<ImageType> RPIiterator;

    { // Fill in left half
      const typename ImageType::IndexType RPIindex = { { 0, 0, 0 } };
      const typename ImageType::SizeType  RPIsize = { { 5, 10, 10 } };
      RPIregion = typename ImageType::RegionType(RPIindex, RPIsize);
      RPIiterator = itk::ImageRegionIterator<ImageType>(img, RPIregion);
      while (!RPIiterator.IsAtEnd())
      {
        RPIiterator.Set(RPIiterator.Get() + LEFT);
        ++RPIiterator;
      }
    }
    { // Fill in anterior half
      const typename ImageType::IndexType RPIindex = { { 0, 5, 0 } };
      const typename ImageType::SizeType  RPIsize = { { 10, 5, 10 } };
      RPIregion = typename ImageType::RegionType(RPIindex, RPIsize);
      RPIiterator = itk::ImageRegionIterator<ImageType>(img, RPIregion);
      while (!RPIiterator.IsAtEnd())
      {
        RPIiterator.Set(RPIiterator.Get() + ANTERIOR);
        ++RPIiterator;
      }
    }
    { // Fill in superior half
      const typename ImageType::IndexType RPIindex = { { 0, 0, 5 } };
      const typename ImageType::SizeType  RPIsize = { { 10, 10, 5 } };
      RPIregion = typename ImageType::RegionType(RPIindex, RPIsize);
      RPIiterator = itk::ImageRegionIterator<ImageType>(img, RPIregion);
      while (!RPIiterator.IsAtEnd())
      {
        RPIiterator.Set(RPIiterator.Get() + SUPERIOR);
        ++RPIiterator;
      }
    }
    {
      // Don't use identity DirectionCosine, Unit Spacing, or Zero Origin
      typename ImageType::DirectionType dc;
      dc[0][0] = 0;
      dc[0][1] = 1;
      dc[0][2] = 0;
      dc[1][0] = 0;
      dc[1][1] = 0;
      dc[1][2] = 1;
      dc[2][0] = 1;
      dc[2][1] = 0;
      dc[2][2] = 0;
      img->SetDirection(dc);
      typename ImageType::SpacingType sp;
      sp[0] = 1.0;
      sp[1] = 2.0;
      sp[2] = 3.0;
      img->SetSpacing(sp);
      typename ImageType::PointType og;
      og[0] = -10.0;
      og[1] = -20.0;
      og[2] = -30.0;
      img->SetOrigin(og);
    }
    {
      // Set the qform, sform and aux_file values for the MetaDataDictionary.
      itk::MetaDataDictionary & thisDic = img->GetMetaDataDictionary();
      itk::EncapsulateMetaData<std::string>(thisDic, "qform_code_name", "NIFTI_XFORM_SCANNER_ANAT");
      itk::EncapsulateMetaData<std::string>(thisDic, "sform_code_name", "NIFTI_XFORM_UNKNOWN");
      itk::EncapsulateMetaData<std::string>(thisDic, "aux_file", "aux_info.txt");
    }

    try
    {
      itk::IOTestHelper::WriteImage<ImageType, itk::NiftiImageIO>(img, std::string(filename));
    }
    catch (const itk::ExceptionObject & ex)
    {
      std::string message;
      message = "Problem found while writing image ";
      message += filename;
      message += "\n";
      message += ex.GetLocation();
      message += "\n";
      message += ex.GetDescription();
      std::cerr << message << std::endl;
      itk::IOTestHelper::Remove(filename);
      return EXIT_FAILURE;
    }
  } // End writing image test

  typename ImageType::Pointer input;
  try
  {
    input = itk::IOTestHelper::ReadImage<ImageType>(std::string(filename));
    // Get the sform and qform codes from the image
    itk::MetaDataDictionary & thisDic = input->GetMetaDataDictionary();
    // std::cout << "DICTIONARY:\n" << std::endl;
    // thisDic.Print( std::cout );
    std::string qform_temp = "";
    if (!itk::ExposeMetaData<std::string>(thisDic, "qform_code_name", qform_temp) ||
        qform_temp != "NIFTI_XFORM_SCANNER_ANAT")
    {
      std::cerr << "ERROR: qform code not recovered from file properly: 'NIFTI_XFORM_SCANNER_ANAT' != ." << qform_temp
                << '\'' << std::endl;
      return EXIT_FAILURE;
    }
    std::string sform_temp = "";
    if (!itk::ExposeMetaData<std::string>(thisDic, "sform_code_name", sform_temp) ||
        sform_temp != "NIFTI_XFORM_SCANNER_ANAT")
    {
      std::cerr << "ERROR: sform code not recovered from file properly:  'NIFTI_XFORM_SCANNER_ANAT' != '" << sform_temp
                << '\'' << std::endl;
      return EXIT_FAILURE;
    }
    std::string auxfile_temp = "";
    if (!itk::ExposeMetaData<std::string>(thisDic, "aux_file", auxfile_temp) || auxfile_temp != "aux_info.txt")
    {
      std::cerr << "ERROR: aux_file not recovered from file properly:  'aux_info.txt' != '" << auxfile_temp << '\''
                << std::endl;
      return EXIT_FAILURE;
    }
  }
  catch (const itk::ExceptionObject & e)
  {
    e.Print(std::cerr);
    itk::IOTestHelper::Remove(filename);
    return EXIT_FAILURE;
  }
  itk::IOTestHelper::Remove(filename);
  return EXIT_SUCCESS;
}

template <typename ImageType>
typename ImageType::DirectionType
CORDirCosines()
{
  typename itk::SpatialOrientationAdapter::DirectionType CORdir = itk::SpatialOrientationAdapter().ToDirectionCosines(
    itk::SpatialOrientationEnums::ValidCoordinateOrientations::ITK_COORDINATE_ORIENTATION_RIP);
  typename ImageType::DirectionType dir;
  for (unsigned int i = 0; i < ImageType::ImageDimension; ++i)
  {
    for (unsigned int j = 0; j < ImageType::ImageDimension; ++j)
    {
      dir[i][j] = CORdir[i][j];
    }
  }
  if (ImageType::ImageDimension == 2)
  {
    dir[1][1] = 1.0;
  }
  return dir;
}

/* common code for DTi and sym matrix tests
 *
 * Could probably be made to fo the image of vector test as well
 */
template <typename PixelType, unsigned int VDimension>
int
TestImageOfSymMats(const std::string & fname)
{

  constexpr int dimsize = 2;
  /** Deformation field pixel type. */
  //  using PixelType = typename itk::DiffusionTenor3D<ScalarType>;

  /** Deformation field type. */
  using DtiImageType = typename itk::Image<PixelType, VDimension>;

  //
  // swizzle up a random vector image.
  typename DtiImageType::RegionType  imageRegion;
  typename DtiImageType::SizeType    size;
  typename DtiImageType::IndexType   index;
  typename DtiImageType::SpacingType spacing;
  typename DtiImageType::PointType   origin;
  // original test case was destined for failure.  NIfTI always writes out 3D
  // orientation.  The only sensible matrices you could pass in would be of the form
  // A B C 0
  // D E F 0
  // E F G 0
  // 0 0 0 1
  // anything in the 4th dimension that didn't follow that form would just come up scrambled.
  // NOTE: Nifti only reports up to 3D images correctly for direction cosigns.  It is implicitly assumed
  //      that the direction for dimensions 4 or greater come diagonal elements including a 1 in the
  //      direction matrix.
  const typename DtiImageType::DirectionType myDirection = PreFillDirection<VDimension>();

  std::cout << " === Testing DtiImageType:  Image Dimension " << static_cast<int>(VDimension) << std::endl
            << "======================== Initialized Direction" << std::endl
            << myDirection << std::endl;

  for (unsigned int i = 0; i < VDimension; ++i)
  {
    size[i] = dimsize;
    index[i] = 0;
    spacing[i] = 1.0;
    origin[i] = 0;
  }

  imageRegion.SetSize(size);
  imageRegion.SetIndex(index);
  typename DtiImageType::Pointer vi =
    itk::IOTestHelper::AllocateImageFromRegionAndSpacing<DtiImageType>(imageRegion, spacing);
  vi->SetOrigin(origin);
  vi->SetDirection(myDirection);

  int dims[7];
  int _index[7];
  for (unsigned int i = 0; i < VDimension; ++i)
  {
    dims[i] = size[i];
  }
  for (unsigned int i = VDimension; i < 7; ++i)
  {
    dims[i] = 1;
  }

  int incr_value = 0;
  //  for(fillIt.GoToBegin(); !fillIt.IsAtEnd(); ++fillIt)
  for (int l = 0; l < dims[6]; ++l)
  {
    _index[6] = l;
    for (int m = 0; m < dims[5]; ++m)
    {
      _index[5] = m;
      for (int n = 0; n < dims[4]; ++n)
      {
        _index[4] = n;
        for (int p = 0; p < dims[3]; ++p)
        {
          _index[3] = p;
          for (int i = 0; i < dims[2]; ++i)
          {
            _index[2] = i;
            for (int j = 0; j < dims[1]; ++j)
            {
              _index[1] = j;
              for (int k = 0; k < dims[0]; ++k)
              {
                _index[0] = k;
                PixelType pixel;
                for (unsigned int q = 0; q < pixel.Size(); ++q)
                {
                  // pixel[q] = randgen.drand32(lowrange,highrange);
                  pixel[q] = incr_value++;
                }
                for (unsigned int q = 0; q < VDimension; ++q)
                {
                  index[q] = _index[q];
                }
                vi->SetPixel(index, pixel);
              }
            }
          }
        }
      }
    }
  }
  try
  {
    itk::IOTestHelper::WriteImage<DtiImageType, itk::NiftiImageIO>(vi, fname);
  }
  catch (const itk::ExceptionObject & ex)
  {
    std::string message;
    message = "Problem found while writing image ";
    message += fname;
    message += "\n";
    message += ex.GetLocation();
    message += "\n";
    message += ex.GetDescription();
    std::cout << message << std::endl;
    itk::IOTestHelper::Remove(fname.c_str());
    return EXIT_FAILURE;
  }
  //
  // read it back in.
  typename DtiImageType::Pointer readback;
  try
  {
    readback = itk::IOTestHelper::ReadImage<DtiImageType>(fname);
  }
  catch (const itk::ExceptionObject & ex)
  {
    std::string message;
    message = "Problem found while reading image ";
    message += fname;
    message += "\n";
    message += ex.GetLocation();
    message += "\n";
    message += ex.GetDescription();
    std::cout << message << std::endl;
    itk::IOTestHelper::Remove(fname.c_str());
    return EXIT_FAILURE;
  }
  bool same = true;
  if (readback->GetOrigin() != vi->GetOrigin())
  {
    std::cout << "Origin is different: " << readback->GetOrigin() << " != " << vi->GetOrigin() << std::endl;
    same = false;
  }
  if (readback->GetSpacing() != vi->GetSpacing())
  {
    std::cout << "Spacing is different: " << readback->GetSpacing() << " != " << vi->GetSpacing() << std::endl;
    same = false;
  }
  for (unsigned int r = 0; r < VDimension; ++r)
  {
    for (unsigned int c = 0; c < VDimension; ++c)
    {
      if (itk::Math::abs(readback->GetDirection()[r][c] - vi->GetDirection()[r][c]) > 1e-7)
      {
        std::cout << "Direction is different:\n " << readback->GetDirection() << "\n != \n"
                  << vi->GetDirection() << std::endl;
        same = false;
        break;
      }
    }
  }
  std::cout << "Original Image  ?=   Image read from disk " << std::endl;
  for (int l = 0; l < dims[6]; ++l)
  {
    _index[6] = l;
    for (int m = 0; m < dims[5]; ++m)
    {
      _index[5] = m;
      for (int n = 0; n < dims[4]; ++n)
      {
        _index[4] = n;
        for (int p = 0; p < dims[3]; ++p)
        {
          _index[3] = p;
          for (int i = 0; i < dims[2]; ++i)
          {
            _index[2] = i;
            for (int j = 0; j < dims[1]; ++j)
            {
              _index[1] = j;
              for (int k = 0; k < dims[0]; ++k)
              {
                _index[0] = k;
                PixelType p1, p2;
                for (unsigned int q = 0; q < VDimension; ++q)
                {
                  index[q] = _index[q];
                }
                p1 = vi->GetPixel(index);
                p2 = readback->GetPixel(index);
                if (p1 != p2)
                {
                  same = false;
                  std::cout << p1 << " != " << p2 << "    ERROR! " << std::endl;
                }
                else
                {
                  std::cout << p1 << " == " << p2 << std::endl;
                }
              }
            }
          }
        }
      }
    }
  }
  if (same)
  {
    itk::IOTestHelper::Remove(fname.c_str());
  }
  else
  {
    std::cout << "Failing image can be found at: " << fname << std::endl;
  }
  return same ? 0 : EXIT_FAILURE;
}

extern bool
Equal(const double a, const double b);

template <typename RGBPixelType>
int
RGBTest(int argc, char * argv[])
{
  if (argc > 2)
  {
    char * testdir = *++argv;
    itksys::SystemTools::ChangeDirectory(testdir);
  }
  else
  {
    return EXIT_FAILURE;
  }
  char * tmpImage = *++argv;
  int    success(EXIT_SUCCESS);
  using RGBImageType = typename itk::Image<RGBPixelType, 3>;
  typename RGBImageType::RegionType  imageRegion;
  typename RGBImageType::SizeType    size;
  typename RGBImageType::IndexType   index;
  typename RGBImageType::SpacingType spacing;
  typename RGBImageType::PointType   origin;

  for (unsigned int i = 0; i < 3; ++i)
  {
    size[i] = 5;
    index[i] = 0;
    spacing[i] = 1.0;
    origin[i] = 0;
  }
  imageRegion.SetSize(size);
  imageRegion.SetIndex(index);
  typename RGBImageType::Pointer im =
    itk::IOTestHelper::AllocateImageFromRegionAndSpacing<RGBImageType>(imageRegion, spacing);
  vnl_random                             randgen(12345678);
  itk::ImageRegionIterator<RGBImageType> it(im, im->GetLargestPossibleRegion());
  for (it.GoToBegin(); !it.IsAtEnd(); ++it)
  {
    RGBPixelType pix;
    for (unsigned int i = 0; i < RGBPixelType::Dimension; ++i)
    {
      pix[i] = randgen.lrand32(255);
    }
    it.Set(pix);
  }
  typename RGBImageType::Pointer im2;
  try
  {
    itk::IOTestHelper::WriteImage<RGBImageType, itk::NiftiImageIO>(im, std::string(tmpImage));
    im2 = itk::IOTestHelper::ReadImage<RGBImageType>(std::string(tmpImage));
  }
  catch (const itk::ExceptionObject & err)
  {
    std::cout << "itkNiftiImageIOTest9" << std::endl << "Exception Object caught: " << std::endl << err << std::endl;
    return EXIT_FAILURE;
  }
  itk::ImageRegionIterator<RGBImageType> it2(im2, im2->GetLargestPossibleRegion());
  for (it.GoToBegin(), it2.GoToBegin(); !it.IsAtEnd() && !it2.IsAtEnd(); ++it, ++it2)
  {
    if (it.Value() != it2.Value())
    {
      std::cout << "Original Pixel (" << it.Value() << ") doesn't match read-in Pixel (" << it2.Value() << std::endl;
      success = EXIT_FAILURE;
      break;
    }
  }
  itk::IOTestHelper::Remove(tmpImage);
  return success;
}

int
WriteNiftiTestFiles(const std::string & prefix);
int
TestNiftiByteSwap(const std::string & prefix);
void
RemoveNiftiByteSwapTestFiles(const std::string & prefix);
void
TestEnumStreaming();
#endif