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/*=========================================================================

  Program:   ORFEO Toolbox
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
  See OTBCopyright.txt for details.

  Copyright (c) CS Systemes d'information. All rights reserved.
  See CSCopyright.txt for details.


     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef otbGroundSpacingImageFunction_h
#define otbGroundSpacingImageFunction_h

#include "itkImageFunction.h"
#include "itkNumericTraits.h"

#include "otbGenericRSTransform.h"

namespace otb
{

/**
 * \class GroundSpacingImageFunction
 * \brief Calculate the approximate ground spacing in X and Y directions
 *
 * This uses the 'Haversine' formula to calculate great-circle distances between
 * the two points (that is, the shortest distance over the Earth's surface)
 * giving an 'as-the-crow-flies' distance between the points (ignoring any hills!).
 *
 * \ingroup ImageFunctions
 *
 * \ingroup OTBProjection
 */
template <class TInputImage, class TCoordRep = float>
class ITK_EXPORT GroundSpacingImageFunction :
    public itk::ImageFunction<TInputImage, itk::Vector<float, 2>,
      TCoordRep>
{
public:
  /** Standard class typedefs. */
  typedef GroundSpacingImageFunction Self;

  /** Datatype used for the density */
  typedef float ValueType;
  //typedef std::pair<ValueType, ValueType> FloatType;
  typedef itk::Vector<ValueType, 2> FloatType;

  typedef itk::ImageFunction<TInputImage, FloatType ,
      TCoordRep>                                          Superclass;

  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  /** Run-time type information (and related methods). */
  itkTypeMacro(GroundSpacingImageFunction, itk::ImageFunction);

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

  /** InputImageType typedef support. */
  typedef TInputImage                              InputImageType;
  typedef typename Superclass::OutputType          OutputType;
  typedef typename Superclass::IndexType           IndexType;
  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
  typedef typename Superclass::PointType           PointType;

  typedef otb::GenericRSTransform<double> TransformType;

  typedef typename IndexType::IndexValueType IndexValueType;

  itkStaticConstMacro(ImageDimension, unsigned int, InputImageType::ImageDimension);

  /** Evalulate the function at specified index */
  FloatType EvaluateAtIndex(const IndexType& index) const ITK_OVERRIDE;

  /** Evaluate the function at non-integer positions */
  FloatType Evaluate(const PointType& point) const ITK_OVERRIDE
  {
    IndexType index;
    this->ConvertPointToNearestIndex(point, index);
    return this->EvaluateAtIndex(index);
  }

  FloatType EvaluateAtContinuousIndex(
    const ContinuousIndexType& cindex) const ITK_OVERRIDE
  {
    IndexType index;
    this->ConvertContinuousIndexToNearestIndex(cindex, index);
    return this->EvaluateAtIndex(index);
  }

  PointType GetPixelLocation(const IndexType& index) const;

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

private:
  GroundSpacingImageFunction(const Self &);  //purposely not implemented
  void operator =(const Self&);  //purposely not implemented

  ValueType              m_R;
  ValueType              m_Deg2radCoef;
};

} // end namespace otb

#ifndef OTB_MANUAL_INSTANTIATION
# include "otbGroundSpacingImageFunction.txx"
#endif

#endif