/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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.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 "itkImageFileWriter.h"
#include "itkImageFileReader.h"
#include "itkTimeProbesCollectorBase.h"


namespace {

template <typename TImageType>
int ActualTest( std::string filename, typename TImageType::SizeType size )
{
  typedef TImageType                    ImageType;
  typedef typename ImageType::PixelType PixelType;


  typedef itk::ImageFileWriter< ImageType >   WriterType;
  typedef itk::ImageFileReader< ImageType >   ReaderType;

  typedef itk::ImageRegionIterator< ImageType >       IteratorType;
  typedef itk::ImageRegionConstIterator< ImageType >  ConstIteratorType;

  typename ImageType::RegionType region;
  typename ImageType::IndexType index;

  PixelType pixelValue;

  itk::TimeProbesCollectorBase chronometer;

  { // begin write block
  typename ImageType::Pointer image = ImageType::New();
  index.Fill(0);
  region.SetSize(size);
  region.SetIndex(index);

  image->SetRegions(region);

  size_t numberOfPixels = 1;
  for (unsigned int i = 0; i < ImageType::ImageDimension; ++i )
    {
    numberOfPixels *= region.GetSize( i );
    }

  const unsigned long sizeInMegaBytes = static_cast< unsigned long >(
    ( sizeof(PixelType) * numberOfPixels ) / ( 1024.0 * 1024.0 ) );


  std::cout << "Trying to allocate an image of size " << sizeInMegaBytes << " Mb " << std::endl;

  chronometer.Start("Allocate");
  image->Allocate();
  chronometer.Stop("Allocate");

  std::cout << "Initializing pixel values " << std::endl;

  IteratorType itr( image, region );
  itr.GoToBegin();

  pixelValue = itk::NumericTraits< PixelType >::ZeroValue();

  chronometer.Start("Initializing");
  while( !itr.IsAtEnd() )
    {
    itr.Set( pixelValue );
    ++pixelValue;
    ++itr;
    }
  chronometer.Stop("Initializing");

  std::cout << "Trying to write the image to disk" << std::endl;
  try
    {
    typename WriterType::Pointer writer = WriterType::New();
    writer->SetInput(image);
    writer->SetFileName( filename );
    chronometer.Start("Write");
    writer->Update();
    chronometer.Stop("Write");
    }
  catch (itk::ExceptionObject &ex)
    {
    std::cout << ex << std::endl;
    return EXIT_FAILURE;
    }
  } // end write block to free the memory

  std::cout << "Trying to read the image back from disk" << std::endl;
  typename ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName( filename );

  try
    {
    chronometer.Start("Read");
    reader->Update();
    chronometer.Stop("Read");
    }
  catch (itk::ExceptionObject &ex)
    {
    std::cout << ex << std::endl;
    return EXIT_FAILURE;
    }

  typename ImageType::ConstPointer readImage = reader->GetOutput();

  ConstIteratorType ritr( readImage, region );
  // IteratorType oitr( image, region );

  ritr.GoToBegin();
  // oitr.GoToBegin();

  std::cout << "Comparing the pixel values.. :" << std::endl;

  pixelValue = itk::NumericTraits< PixelType >::ZeroValue();

  chronometer.Start("Compare");
  while( !ritr.IsAtEnd() )
    {
    // if( ( oitr.Get() != ritr.Get() ) || ( oitr.Get() != pixelValue ) )
    if( ritr.Get() != pixelValue )
      {
      std::cerr << "Pixel comparison failed at index = " << ritr.GetIndex() << std::endl;
      std::cerr << "Expected pixel value " << pixelValue << std::endl;
      // std::cerr << "Original Image pixel value " << oitr.Get() << std::endl;
      std::cerr << "Read Image pixel value " << ritr.Get() << std::endl;
      return EXIT_FAILURE;
      }

    ++pixelValue;
    // ++oitr;
    ++ritr;
    }
  chronometer.Stop("Compare");

  chronometer.Report( std::cout );

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

  return EXIT_SUCCESS;
}

}

int itkLargeImageWriteReadTest(int ac, char* argv[])
{

  if (ac < 3)
    {
    std::cout << "usage: itkIOTests itkLargeImageWriteReadTest outputFileName numberOfPixelsInOneDimension [numberOfZslices]" << std::endl;
    return EXIT_FAILURE;
    }

  const std::string filename = argv[1];

  if ( ac == 3 )
    {
    const unsigned int Dimension = 2;

    typedef unsigned short                    PixelType;
    typedef itk::Image< PixelType, Dimension> ImageType;

    ImageType::SizeType size;

    size.Fill( atol( argv[2] ) );

    return ActualTest< ImageType >( filename, size );

    }
  else
    {
    const unsigned int Dimension = 3;

    typedef unsigned short                    PixelType;
    typedef itk::Image< PixelType, Dimension> ImageType;

    ImageType::SizeType size;

    size.Fill( atol( argv[2] ) );
    size[2] = atol( argv[3] );

    return ActualTest< ImageType >( filename, size );
    }

}
