/*
 * Copyright (C) 2005-2020 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 "otbVirtualDimensionality.h"

#include "otbVectorImage.h"
#include "otbImageFileReader.h"
#include "otbStreamingStatisticsVectorImageFilter.h"

const unsigned int Dimension = 2;
typedef double     PixelType;

typedef otb::VectorImage<PixelType, Dimension> ImageType;
typedef otb::ImageFileReader<ImageType>                      ReaderType;
typedef otb::StreamingStatisticsVectorImageFilter<ImageType> StreamingStatisticsVectorImageFilterType;

typedef otb::VirtualDimensionality<double> VDType;

int otbVirtualDimensionalityTest(int itkNotUsed(argc), char* argv[])
{
  const char* infname  = argv[1];
  const char* outfname = argv[2];

  StreamingStatisticsVectorImageFilterType::Pointer stats = StreamingStatisticsVectorImageFilterType::New();

  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName(infname);

  stats->SetInput(reader->GetOutput());
  stats->Update();

  VDType::Pointer vd = VDType::New();
  vd->SetCovariance(stats->GetCovariance().GetVnlMatrix());
  vd->SetCorrelation(stats->GetCorrelation().GetVnlMatrix());
  vd->SetNumberOfPixels(reader->GetOutput()->GetLargestPossibleRegion().GetNumberOfPixels());

  std::ofstream file;
  file.open(outfname);
  file.precision(5);

  for (int i = 2; i < 10; ++i)
  {
    double falseAlarmRate = std::pow(static_cast<double>(10), static_cast<double>(-i));
    vd->SetFAR(falseAlarmRate);
    vd->Compute();

    std::cout << "FAR : 1E-" << i << " -> Nb Endmembers: " << vd->GetNumberOfEndmembers() << std::endl;
    file << "FAR : 1E-" << i << " -> Nb Endmembers: " << vd->GetNumberOfEndmembers() << std::endl;
  }

  file.close();

  return EXIT_SUCCESS;
}
