/*=========================================================================
 *
 *  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.
 *
 *=========================================================================*/

#include <fstream>
#include "itkRawImageIO.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkTestingMacros.h"


// Specific ImageIO test

template <typename TPixel>
class RawImageReaderAndWriter
{
public:
  using PixelType = unsigned char;

  using RawImageIOType = itk::RawImageIO<PixelType, 2>;

  using ImageType = itk::Image<PixelType, 2>;

public:
  RawImageReaderAndWriter()
  {
    m_Image = ImageType::New();

    typename ImageType::RegionType region;
    typename ImageType::SizeType   size;
    typename ImageType::IndexType  start;

    start.Fill(0);
    size[0] = 16; // To fill the range of 8 bits image
    size[1] = 16;

    region.SetSize(size);
    region.SetIndex(start);

    m_Image->SetRegions(region);
    m_Image->Allocate();

    PixelType value{};

    // Fill the image with incremental values.
    using IteratorType = itk::ImageRegionIterator<ImageType>;
    IteratorType it(m_Image, region);

    it.GoToBegin();

    while (!it.IsAtEnd())
    {
      it.Set(value);
      ++value;
      ++it;
    }

    m_Error = false;
  }

  void
  Write()
  {
    using WriterType = itk::ImageFileWriter<ImageType>;
    auto writer = WriterType::New();

    writer->SetFileName(m_FileName.c_str());
    writer->SetInput(m_Image);

    auto rawImageIO = RawImageIOType::New();
    writer->SetImageIO(rawImageIO);

    writer->Update();
  }

  void
  Read()
  {
    using ReaderType = itk::ImageFileReader<ImageType>;
    auto reader = ReaderType::New();
    reader->SetFileName(m_FileName.c_str());

    auto rawImageIO = RawImageIOType::New();
    reader->SetImageIO(rawImageIO);

    unsigned int dim[2] = { 16, 16 };
    double       spacing[2] = { 1.0, 1.0 };
    double       origin[2] = { 0.0, 0.0 };

    for (unsigned int i = 0; i < 2; ++i)
    {
      rawImageIO->SetDimensions(i, dim[i]);
      rawImageIO->SetSpacing(i, spacing[i]);
      rawImageIO->SetOrigin(i, origin[i]);
    }

    rawImageIO->SetHeaderSize(0);
    rawImageIO->SetByteOrderToLittleEndian();
    rawImageIO->SetNumberOfComponents(1);

    reader->Update();

    ImageType::ConstPointer image = reader->GetOutput();


    //
    // Verify the content of the image.
    //
    using ConstIteratorType = itk::ImageRegionConstIterator<ImageType>;

    ConstIteratorType it1(m_Image, m_Image->GetLargestPossibleRegion());
    ConstIteratorType it2(image, image->GetLargestPossibleRegion());

    it1.GoToBegin();
    it2.GoToBegin();

    m_Error = false;

    while (it1.IsAtEnd())
    {
      if (it1.Get() != it2.Get())
      {
        m_Error = true;
        break;
      }
      ++it1;
      ++it2;
    }
  }

  void
  SetFileName(const std::string & filename)
  {
    m_FileName = filename;
  }

  bool
  GetError() const
  {
    return m_Error;
  }

private:
  std::string m_FileName;

  typename ImageType::Pointer m_Image;

  bool m_Error;
};

int
itkRawImageIOTest5(int argc, char * argv[])
{

  if (argc < 2)
  {
    std::cerr << "Missing Parameters." << std::endl;
    std::cerr << "Usage: " << std::endl;
    std::cerr << itkNameOfTestExecutableMacro(argv) << " TemporaryDirectoryName" << std::endl;
    return EXIT_FAILURE;
  }


  std::string directory = argv[1];


  //
  // Test the pixel type = "char"
  //
  std::cout << "Testing for pixel type = char " << std::endl;


  RawImageReaderAndWriter<char> tester1;


  std::string filename = directory + "/RawImageIOTest5a.raw";

  tester1.SetFileName(filename);

  ITK_TRY_EXPECT_NO_EXCEPTION(tester1.Write());

  ITK_TRY_EXPECT_NO_EXCEPTION(tester1.Read());


  if (tester1.GetError())
  {
    std::cerr << "Error while comparing the char type images." << std::endl;
    return EXIT_FAILURE;
  }

  //
  // Test the pixel type = "signed char"
  //
  std::cout << "Testing for pixel type = signed char " << std::endl;

  RawImageReaderAndWriter<signed char> tester2;

  filename = directory + "/RawImageIOTest5b.raw";

  tester2.SetFileName(filename);

  ITK_TRY_EXPECT_NO_EXCEPTION(tester2.Write());

  ITK_TRY_EXPECT_NO_EXCEPTION(tester2.Read());

  if (tester2.GetError())
  {
    std::cerr << "Error while comparing the signed char type images." << std::endl;
    return EXIT_FAILURE;
  }

  //
  // Test the pixel type = "unsigned char"
  //
  std::cout << "Testing for pixel type = unsigned char " << std::endl;

  RawImageReaderAndWriter<unsigned char> tester3;


  filename = directory + "/RawImageIOTest5c.raw";

  tester3.SetFileName(filename);

  ITK_TRY_EXPECT_NO_EXCEPTION(tester3.Write());

  ITK_TRY_EXPECT_NO_EXCEPTION(tester3.Read());

  if (tester3.GetError())
  {
    std::cerr << "Error while comparing the unsigned char type images." << std::endl;
    return EXIT_FAILURE;
  }

  std::cout << "Test PASSED !!" << std::endl << std::endl;

  return EXIT_SUCCESS;
}