/*
 * Copyright (C) 2005-2019 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 otbRemoteSensingRegion_h
#define otbRemoteSensingRegion_h

#include <algorithm>
#include <iomanip>

#include "OTBImageBaseExport.h"
#include "otbImageKeywordlist.h"
#include "itkImageRegion.h"
#include <string>

namespace otb
{

/** \class RemoteSensingRegion
 * \brief An RemoteSensingRegion represents a structured region of data.
 *
 * RemoteSensingRegion is an class that represents some structured portion or
 * piece of an Image. The RemoteSensingRegion is represented with an index and
 * a size in each of the n-dimensions of the image. (The index is the
 * corner of the image, the size is the lengths of the image in each of
 * the topological directions. <b>For this class, the notion of index and origin
 * are the same.</b>)
 *
 * As the size and origin can be given in various system coordinates, they contain
 * double values (through the use of an itk::ContinuousIndex).
 *
 * To be flexible enough, the region also contain information about the projection
 * in which this information is given. It can be a cartographic projection, but also
 * a sensor model projection (hence making it useful also with non-orthorectified
 * images).
 *
 * \sa VectorDataExtractROI
 *
 * \ingroup OTBImageBase
 */

template <class TType>
class OTBImageBase_EXPORT_TEMPLATE RemoteSensingRegion : public itk::Region
{
public:
  /** Standard class typedefs. */
  typedef otb::RemoteSensingRegion<TType> Self;
  typedef itk::Region                     Superclass;
  typedef itk::SmartPointer<Self>         Pointer;
  typedef itk::SmartPointer<const Self>   ConstPointer;

  /** Standard part of all itk objects. */
  itkTypeMacro(RemoteSensingRegion, itk : Region);

  /** Typedef Support*/
  typedef TType Type;

  /** Index typedef support. An index is used to access pixel values. */
  typedef itk::ContinuousIndex<Type> IndexType;
  typedef itk::Point<Type, 2> PointType;

  /** Size typedef support. A size is used to define region bounds. */
  typedef itk::ContinuousIndex<Type> SizeType;
  //   typedef itk::Size<2>                         StandardSizeType;

  /** ImageRegion typedef needed by the GetImageRegion() method */
  typedef itk::ImageRegion<2> ImageRegionType;

  typename Superclass::RegionType GetRegionType() const override
  {
    return Superclass::ITK_STRUCTURED_REGION;
  }

  /** Constructor. RemoteSensingRegion is a lightweight object that is not reference
   * counted, so the constructor is public.  Default dimension is 2. */
  RemoteSensingRegion()
  {
    m_InputProjectionRef = "";
    m_Size.Fill(0.);
    m_Index.Fill(0.);
  }

  /** Constructor. RemoteSensingRegion is a lightweight object that is not reference
    * counted, so the constructor is public.  Default dimension is 2. */
  RemoteSensingRegion(const itk::ImageRegion<2>& region)
  {
    m_InputProjectionRef = "";
    m_Size[0]            = region.GetSize()[0];
    m_Size[1]            = region.GetSize()[1];
    m_Index[0]           = region.GetIndex()[0];
    m_Index[1]           = region.GetIndex()[1];
  }

  /** Destructor. RemoteSensingRegion is a lightweight object that is not reference
   * counted, so the destructor is public. */
  ~RemoteSensingRegion() override
  {
  }

  /** operator=. RemoteSensingRegion is a lightweight object that is not reference
   * counted, so operator= is public. */
  void operator=(const Self& region)
  {
    m_Index              = region.m_Index;
    m_Size               = region.m_Size;
    m_InputProjectionRef = region.m_InputProjectionRef;
    m_KeywordList        = region.m_KeywordList;
  }

  /** This method provides explicit conversion to itk::ImageRegion<2>,
   * so as to allow using RemoteSensingRegion to specify requested
   * region for images or images iterators.
   */
  const ImageRegionType GetImageRegion()
  {
    ImageRegionType                     imageRegion;
    typename ImageRegionType::IndexType irIndex;
    typename ImageRegionType::SizeType  irSize;

    irIndex[0] = static_cast<unsigned long>(std::floor(m_Index[0]));
    irIndex[1] = static_cast<unsigned long>(std::floor(m_Index[1]));
    irSize[0]  = static_cast<unsigned long>(std::ceil(m_Size[0]));
    irSize[1]  = static_cast<unsigned long>(std::ceil(m_Size[1]));

    imageRegion.SetIndex(irIndex);
    imageRegion.SetSize(irSize);

    return imageRegion;
  }

  /** Set the index defining the corner of the region. */
  void SetOrigin(const IndexType& index)
  {
    m_Index = index;
  }

  /** Set the index defining the corner of the region. */
  void SetOrigin(const PointType& index)
  {
    m_Index[0] = index[0];
    m_Index[1] = index[1];
  }

  /** Get index defining the corner of the region. */
  const IndexType& GetOrigin() const
  {
    return m_Index;
  }

  /** Set the index defining the corner of the region. */
  void SetIndex(const IndexType& index)
  {
    m_Index = index;
  }

  /** Get index defining the corner of the region. */
  const IndexType& GetIndex() const
  {
    return m_Index;
  }

  /** Set the size of the region. This plus the index determines the
   * rectangular shape, or extent, of the region. */
  void SetSize(const SizeType& size)
  {
    m_Size = size;
  }

  //   void SetSize(const StandardSizeType &size)
  //     {
  //       m_Size[0] = size[0];
  //       m_Size[1] = size[1];
  //     }

  /** Get the size of the region. */
  const SizeType& GetSize() const
  {
    return m_Size;
  }

  /** Convenience methods to get the size of the image in a particular
   * coordinate direction i. Do not try to access image sizes beyond the
   * the ImageDimension. */
  Type GetSize(unsigned int i) const
  {
    return m_Size[i];
  }
  Type GetOrigin(unsigned int i) const
  {
    return m_Index[i];
  }
  void SetSize(const unsigned int i, Type size)
  {
    m_Size[i] = size;
  }
  void SetOrigin(const unsigned int i, Type idx)
  {
    m_Index[i] = idx;
  }

  const ImageKeywordlist& GetKeywordList() const
  {
    return m_KeywordList;
  }

  void SetKeywordList(const ImageKeywordlist& kwl)
  {
    this->m_KeywordList = kwl;
  }

  /** Compare two regions. */
  bool operator==(const Self& region) const
  {
    bool same = 1;
    same      = (m_Index == region.m_Index);
    same      = same && (m_Size == region.m_Size);
    return same;
  }

  /** Compare two regions. */
  bool operator!=(const Self& region) const
  {
    bool same = 1;
    same      = (m_Index == region.m_Index);
    same      = same && (m_Size == region.m_Size);
    return !same;
  }

  /** Test if an index is inside */
  bool IsInside(const IndexType& index) const
  {
    for (unsigned int i = 0; i < IndexType::IndexDimension; ++i)
    {
      if ((index[i] < m_Index[i]) && (index[i] < m_Index[i] + m_Size[i]))
      {
        return false;
      }
      if ((index[i] >= m_Index[i]) && (index[i] >= m_Index[i] + m_Size[i]))
      {
        return false;
      }
    }
    return true;
  }

  /**Get/Set InputProjectionRef  std::string*/
  void SetRegionProjection(const std::string& projection)
  {
    m_InputProjectionRef = projection;
  }

  std::string GetRegionProjection()
  {
    return m_InputProjectionRef;
  }

  /**
   * Crop
   */
  bool Crop(const Self& region)
  {
    Type crop;
    bool cropPossible = true;

    // Can we crop?
    for (unsigned int i = 0; i < IndexType::IndexDimension && cropPossible; ++i)
    {

      if (((region.GetOrigin()[i] <= m_Index[i]) && (region.GetOrigin()[i] <= m_Index[i] + static_cast<Type>(m_Size[i])) &&
           ((region.GetOrigin()[i] + static_cast<Type>(region.GetSize()[i])) <= m_Index[i]) &&
           ((region.GetOrigin()[i] + static_cast<Type>(region.GetSize()[i])) <= m_Index[i] + static_cast<Type>(m_Size[i]))) ||
          ((region.GetOrigin()[i] >= m_Index[i]) && (region.GetOrigin()[i] >= m_Index[i] + static_cast<Type>(m_Size[i])) &&
           ((region.GetOrigin()[i] + static_cast<Type>(region.GetSize()[i])) >= m_Index[i]) &&
           ((region.GetOrigin()[i] + static_cast<Type>(region.GetSize()[i])) >= m_Index[i] + static_cast<Type>(m_Size[i]))))
      {
        return false;
      }
    }

    // we can crop, so crop
    for (unsigned int i = 0; i < IndexType::IndexDimension; ++i)
    {
      // first check the start index
      if (m_Index[i] < region.GetOrigin()[i])
      {
        // how much do we need to adjust
        crop = region.GetOrigin()[i] - m_Index[i];

        // adjust the start index and the size of the current region
        m_Index[i] += crop;
        m_Size[i] -= static_cast<Type>(crop);
      }
      // now check the final size
      if (m_Index[i] + static_cast<Type>(m_Size[i]) > region.GetOrigin()[i] + static_cast<Type>(region.GetSize()[i]))
      {
        // how much do we need to adjust
        crop = m_Index[i] + static_cast<Type>(m_Size[i]) - region.GetOrigin()[i] - static_cast<Type>(region.GetSize()[i]);

        // adjust the size
        m_Size[i] -= static_cast<Type>(crop);
      }
    }

    return cropPossible;
  }

protected:
  void PrintSelf(std::ostream& os, itk::Indent indent) const override
  {
    os << std::setprecision(15);
    os << indent << "RemoteSensingRegion" << std::endl;
    os << indent << "Index:" << this->m_Index << std::endl;
    os << indent << "Size:" << this->m_Size << std::endl;
    os << indent << "Projection:" << this->m_InputProjectionRef << std::endl;
    os << indent << "Keywordlist: " << this->m_KeywordList << std::endl;
  }

private:
  IndexType m_Index;
  SizeType  m_Size;

  std::string      m_InputProjectionRef;
  ImageKeywordlist m_KeywordList; // if we want to specify the region in term of sensor geometry
};
// extern std::ostream & operator<<(std::ostream &os, const RemoteSensingRegion &region);

template <class TType>
std::ostream& operator<<(std::ostream& os, const RemoteSensingRegion<TType>& region)
{
  region.Print(os);
  return os;
}

template <class ImageType, class RemoteSensingRegionType>
typename ImageType::RegionType TransformPhysicalRegionToIndexRegion(const RemoteSensingRegionType& region, const ImageType* image)
{
  typename ImageType::RegionType            outputRegion;
  typename ImageType::RegionType::IndexType index;
  typename ImageType::RegionType::IndexType index2;

  typename ImageType::PointType point;
  point[0] = region.GetIndex()[0];
  point[1] = region.GetIndex()[1];
  image->TransformPhysicalPointToIndex(point, index);

  point[0] = region.GetIndex()[0] + region.GetSize()[0];
  point[1] = region.GetIndex()[1] + region.GetSize()[1];
  image->TransformPhysicalPointToIndex(point, index2);

  typename ImageType::RegionType::SizeType size;
  size[0] = std::abs(index2[0] - index[0]);
  size[1] = std::abs(index2[1] - index[1]);

  index[0] = std::min(index2[0], index[0]);
  index[1] = std::min(index2[1], index[1]);

  outputRegion.SetIndex(index);
  outputRegion.SetSize(size);
  return outputRegion;
}


} // end namespace otb

#endif