/*
 * Copyright (C) 2005-2017 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * 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
 *
 * 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 "otbImage.h"
#include "otbChangeNoDataValueFilter.h"
#include "itkImageRegionIterator.h"

int otbChangeNoDataValueFilter(int itkNotUsed(argc),char * itkNotUsed(argv) [])
{

  // Build an image
  typedef otb::Image<double> ImageType;
  ImageType::Pointer img = ImageType::New();

  ImageType::SizeType size;
  size.Fill(20);

  ImageType::RegionType region;
  region.SetSize(size);

  // Fill it with a default value
  img->SetRegions(region);
  img->Allocate();
  img->FillBuffer(10);

  // Write no-data flags to it
  std::vector<bool> flags(1,true);
  std::vector<double> values(1,-10.);
  otb::WriteNoDataFlags(flags,values,img->GetMetaDataDictionary());

  // Fill half of the pixels with no-data values
  itk::ImageRegionIterator<ImageType> it(img,region);
  unsigned int count = 0;
  for(it.GoToBegin();!it.IsAtEnd();++it,++count)
    {
    if (count%2 == 0)
      it.Set(-10.);
    }

  // Instantiate filter
  typedef otb::ChangeNoDataValueFilter<ImageType,ImageType> FilterType;
  FilterType::Pointer filter = FilterType::New();

  std::vector<double> newValues(1,-20.);

  filter->SetInput(img);
  filter->SetNewNoDataValues(newValues);
  filter->Update();

  // Check output
  it = itk::ImageRegionIterator<ImageType>(filter->GetOutput(),region);
  count = 0;

  bool failed = false;
  
  for(it.GoToBegin();!it.IsAtEnd();++it,++count)
    {
    if (count%2 == 0 && it.Get()!=-20.)
      {
      std::cerr<<"Pixel should have new no-data value"<<std::endl;
      failed = true;
      }
    else if(count%2 == 1 && it.Get()!=10.)
      {
      std::cerr<<"Pixel value should be unchanged"<<std::endl;
      failed = true;
      }
    }
  
  otb::ReadNoDataFlags(filter->GetOutput()->GetMetaDataDictionary(),flags,values);

  if(flags.empty() || !flags[0])
    {
    std::cerr<<"Output no-data flag should be [1] "<<std::endl;
    failed = true;
    }

  if(values.empty() || values[0]!=-20)
    {
    std::cerr<<"Output no-data value should be [-20.]"<<std::endl;
    failed = true;
    }

  if(failed)
    return EXIT_FAILURE;

  return EXIT_SUCCESS;
}
