/*
 * Copyright (C) 1999-2011 Insight Software Consortium
 * 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.
 */

#ifndef otbStreamingMinMaxImageFilter_h
#define otbStreamingMinMaxImageFilter_h

#include <vector>
#include "otbPersistentImageFilter.h"
#include "itkNumericTraits.h"
#include "itkSimpleDataObjectDecorator.h"
#include "otbPersistentFilterStreamingDecorator.h"

namespace otb
{

/** \class PersistentMinMaxImageFilter
 * \brief Compute min. max of an image using the output requested region.
 *
 *  This filter persists its temporary data. It means that if you Update it n times on n different
 * requested regions, the output min/max will be the statistics of the whole set of n regions.
 *
 * To reset the temporary data, one should call the Reset() function.
 *
 * To get the min/max once the regions have been processed via the pipeline, use the Synthetize() method.
 *
 * \sa PersistentImageFilter
 * \ingroup Streamed
 * \ingroup Multithreaded
 * \ingroup MathematicalStatisticsImageFilters
 *
 * \ingroup OTBStatistics
 */
template <class TInputImage>
class ITK_EXPORT PersistentMinMaxImageFilter : public PersistentImageFilter<TInputImage, TInputImage>
{
public:
  /** Standard Self typedef */
  typedef PersistentMinMaxImageFilter Self;
  typedef PersistentImageFilter<TInputImage, TInputImage> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Runtime information support. */
  itkTypeMacro(PersistentMinMaxImageFilter, PersistentImageFilter);

  /** Image related typedefs. */
  typedef TInputImage                   ImageType;
  typedef typename TInputImage::Pointer InputImagePointer;

  typedef typename TInputImage::RegionType RegionType;
  typedef typename TInputImage::SizeType   SizeType;
  typedef typename TInputImage::IndexType  IndexType;
  typedef typename TInputImage::PixelType  PixelType;

  itkStaticConstMacro(InputImageDimension, unsigned int, TInputImage::ImageDimension);

  /** Image related typedefs. */
  itkStaticConstMacro(ImageDimension, unsigned int, TInputImage::ImageDimension);

  /** Smart Pointer type to a DataObject. */
  typedef typename itk::DataObject::Pointer                  DataObjectPointer;
  typedef itk::ProcessObject::DataObjectPointerArraySizeType DataObjectPointerArraySizeType;

  /** Type of DataObjects used for scalar outputs */
  typedef itk::SimpleDataObjectDecorator<PixelType> PixelObjectType;
  typedef itk::SimpleDataObjectDecorator<IndexType> IndexObjectType;

  /** Return the computed Minimum. */
  PixelType GetMinimum() const
  {
    return this->GetMinimumOutput()->Get();
  }
  PixelObjectType*       GetMinimumOutput();
  const PixelObjectType* GetMinimumOutput() const;

  /** Return the computed Maximum. */
  PixelType GetMaximum() const
  {
    return this->GetMaximumOutput()->Get();
  }
  PixelObjectType*       GetMaximumOutput();
  const PixelObjectType* GetMaximumOutput() const;

  /** Return the computed Minimum. */
  IndexType GetMinimumIndex() const
  {
    return this->GetMinimumIndexOutput()->Get();
  }
  IndexObjectType*       GetMinimumIndexOutput();
  const IndexObjectType* GetMinimumIndexOutput() const;

  /** Return the computed Maximum. */
  IndexType GetMaximumIndex() const
  {
    return this->GetMaximumIndexOutput()->Get();
  }
  IndexObjectType*       GetMaximumIndexOutput();
  const IndexObjectType* GetMaximumIndexOutput() const;


  /** Make a DataObject of the correct type to be used as the specified
   * output. */
  DataObjectPointer MakeOutput(DataObjectPointerArraySizeType idx) override;
  using Superclass::MakeOutput;

  /** Pass the input through unmodified. Do this by Grafting in the
   *  AllocateOutputs method.
   */
  void AllocateOutputs() override;
  void GenerateOutputInformation() override;
  void Synthetize(void) override;
  void Reset(void) override;

protected:
  PersistentMinMaxImageFilter();
  ~PersistentMinMaxImageFilter() override
  {
  }
  void PrintSelf(std::ostream& os, itk::Indent indent) const override;

  /** Multi-thread version GenerateData. */
  void ThreadedGenerateData(const RegionType& outputRegionForThread, itk::ThreadIdType threadId) override;

private:
  PersistentMinMaxImageFilter(const Self&) = delete;
  void operator=(const Self&) = delete;

  std::vector<PixelType> m_ThreadMin;
  std::vector<PixelType> m_ThreadMax;
  std::vector<IndexType> m_ThreadMinIndex;
  std::vector<IndexType> m_ThreadMaxIndex;
}; // end of class PersistentMinMaxImageFilter


/** \class StreamingMinMaxImageFilter
 * \brief This class streams the whole input image through the PersistentMinMaxImageFilter.
 *
 * This way, it allows computing the minimum and maximum of this image.
 *
 * It calls the Reset() method of the PersistentMinMaxImageFilter before streaming
 * the image and the Synthetize() method of the PersistentMinMaxImageFilter after
 * having streamed the image to compute the statistics.
 *
 * This filter can be used as:
 * \code
 * typedef otb::StreamingMinMaxImageFilter<ImageType> MinMaxType;
 * MinMaxType::Pointer minmax = MinMaxType::New();
 * minmax->SetInput(reader->GetOutput());
 * minmax->Update();
 * std::cout << minmax-> GetMaximum() << std::endl;
 * std::cout << minmax-> GetMinimum() << std::endl;
 * std::cout << minmax-> GetMaximumIndex() << std::endl;
 * std::cout << minmax-> GetMinimumIndex() << std::endl;
 * \endcode
 *
 * \sa PersistentMinMaxImageFilter
 * \sa PersistentImageFilter
 * \sa PersistentFilterStreamingDecorator
 * \sa StreamingImageVirtualWriter
 * \ingroup Streamed
 * \ingroup Multithreaded
 * \ingroup MathematicalStatisticsImageFilters
 *
 * \ingroup OTBStatistics
 */

template <class TInputImage>
class ITK_EXPORT StreamingMinMaxImageFilter : public PersistentFilterStreamingDecorator<PersistentMinMaxImageFilter<TInputImage>>
{
public:
  /** Standard Self typedef */
  typedef StreamingMinMaxImageFilter                                                   Self;
  typedef PersistentFilterStreamingDecorator<PersistentMinMaxImageFilter<TInputImage>> Superclass;
  typedef itk::SmartPointer<Self>                                                      Pointer;
  typedef itk::SmartPointer<const Self>                                                ConstPointer;

  /** Type macro */
  itkNewMacro(Self);

  /** Creation through object factory macro */
  itkTypeMacro(StreamingMinMaxImageFilter, PersistentFilterStreamingDecorator);

  typedef typename Superclass::FilterType          StatFilterType;
  typedef typename StatFilterType::PixelType       PixelType;
  typedef typename StatFilterType::IndexType       IndexType;
  typedef typename StatFilterType::PixelObjectType PixelObjectType;
  typedef typename StatFilterType::IndexObjectType IndexObjectType;
  typedef TInputImage                              InputImageType;

  using Superclass::SetInput;
  void SetInput(InputImageType* input)
  {
    this->GetFilter()->SetInput(input);
  }
  const InputImageType* GetInput()
  {
    return this->GetFilter()->GetInput();
  }

  /** Return the computed Minimum. */
  PixelType GetMinimum() const
  {
    return this->GetFilter()->GetMinimumOutput()->Get();
  }
  PixelObjectType* GetMinimumOutput()
  {
    return this->GetFilter()->GetMinimumOutput();
  }
  const PixelObjectType* GetMinimumOutput() const
  {
    return this->GetFilter()->GetMinimumOutput();
  }
  /** Return the computed Maximum. */
  PixelType GetMaximum() const
  {
    return this->GetFilter()->GetMaximumOutput()->Get();
  }
  PixelObjectType* GetMaximumOutput()
  {
    return this->GetFilter()->GetMaximumOutput();
  }
  const PixelObjectType* GetMaximumOutput() const
  {
    return this->GetFilter()->GetMaximumOutput();
  }

  /** Return the computed Minimum. */
  IndexType GetMinimumIndex() const
  {
    return this->GetFilter()->GetMinimumIndexOutput()->Get();
  }
  IndexObjectType* GetMinimumIndexOutput()
  {
    return this->GetFilter()->GetMinimumIndexOutput();
  }
  const IndexObjectType* GetMinimumIndexOutput() const
  {
    return this->GetFilter()->GetMinimumIndexOutput();
  }
  /** Return the computed Maximum. */
  IndexType GetMaximumIndex() const
  {
    return this->GetFilter()->GetMaximumIndexOutput()->Get();
  }
  IndexObjectType* GetMaximumIndexOutput()
  {
    return this->GetFilter()->GetMaximumIndexOutput();
  }
  const IndexObjectType* GetMaximumIndexOutput() const
  {
    return this->GetFilter()->GetMaximumIndexOutput();
  }

protected:
  /** Constructor */
  StreamingMinMaxImageFilter()
  {
  }
  /** Destructor */
  ~StreamingMinMaxImageFilter() override
  {
  }

private:
  StreamingMinMaxImageFilter(const Self&) = delete;
  void operator=(const Self&) = delete;
};

} // end namespace otb

#ifndef OTB_MANUAL_INSTANTIATION
#include "otbStreamingMinMaxImageFilter.hxx"
#endif

#endif