/*=========================================================================
 *
 *  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 "itkTileImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageSeriesWriter.h"
#include "itkTestingMacros.h"

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

  using PixelType = itk::RGBPixel<unsigned char>;
  enum
  {
    InputImageDimension = 2
  };
  enum
  {
    OutputImageDimension = 2
  };

  using InputImageType = itk::Image<PixelType, InputImageDimension>;
  using OutputImageType = itk::Image<PixelType, OutputImageDimension>;
  using ImageReaderType = itk::ImageFileReader<InputImageType>;
  using TilerType = itk::TileImageFilter<InputImageType, OutputImageType>;
  using WriterType = itk::ImageFileWriter<OutputImageType>;

  if (argc != 6)
  {
    std::cerr << "Usage: " << std::endl;
    std::cerr << itkNameOfTestExecutableMacro(argv) << "  input1 input2 input3 input4 output" << std::endl;
    return EXIT_FAILURE;
  }

  itk::FixedArray<unsigned int, 2> layout;
  layout[0] = 4;
  layout[1] = 1;

  // Tile the input images
  auto tiler1 = TilerType::New();
  auto tiler2 = TilerType::New();
  auto tiler3 = TilerType::New();
  auto tiler4 = TilerType::New();
  auto tiler = TilerType::New();

  unsigned char                      yellow[3] = { 255, 255, 127 };
  const itk::RGBPixel<unsigned char> fillPixel = yellow;

  tiler1->SetDefaultPixelValue(fillPixel);
  tiler1->SetLayout(layout);
  tiler2->SetDefaultPixelValue(fillPixel);
  tiler2->SetLayout(layout);
  tiler3->SetDefaultPixelValue(fillPixel);
  tiler3->SetLayout(layout);
  tiler4->SetDefaultPixelValue(fillPixel);
  tiler4->SetLayout(layout);

  int f = 0;
  for (int i = 1; i < argc - 1; ++i)
  {
    auto reader = ImageReaderType::New();
    reader->SetFileName(argv[i]);
    reader->Update();
    tiler1->SetInput(f, reader->GetOutput());
    tiler2->SetInput(f, reader->GetOutput());
    tiler3->SetInput(f, reader->GetOutput());
    tiler4->SetInput(f++, reader->GetOutput());
  }

  tiler3->PopBackInput();

  InputImageType::ConstPointer image = tiler4->GetInput();
  tiler4->PopFrontInput();
  tiler4->PushBackInput(image);

  image = tiler2->GetInput(3);
  tiler2->PopBackInput();
  tiler2->PushFrontInput(image);

  layout[0] = 1;
  layout[1] = 4;
  tiler->SetDefaultPixelValue(fillPixel);
  tiler->SetLayout(layout);

  tiler->PushBackInput(tiler1->GetOutput());
  tiler->PushBackInput(tiler2->GetOutput());
  tiler->PushBackInput(tiler3->GetOutput());
  tiler->PushBackInput(tiler4->GetOutput());

  auto writer = WriterType::New();

  writer->SetFileName(argv[argc - 1]);

  try
  {
    writer->SetInput(tiler->GetOutput());
    writer->Update();
  }
  catch (const itk::ExceptionObject & excp)
  {
    std::cerr << "Error while writing file." << std::endl;
    std::cerr << excp << std::endl;
    return EXIT_FAILURE;
  }
  std::cout << "Test passed." << std::endl;
  return EXIT_SUCCESS;
}
