#ifndef PNDDRCOPTREFLNONE_H
#define PNDDRCOPTREFLNONE_H

/*! 
  \brief Class for reflectivity of surfaces. 

  Defines the reflectivity of a coated surface. The Geffcken coating is a historical
  broad band coating. Walter Geffcken (1942)

  Eugene Hecht Optics,
  H.Bach, D. Krause Thin Films on Glass

*/

#include "PndDrcOptReflAbs.h"
#include "PndDrcOptMatAbs.h"


#include <vector>
using std::vector;

class PndDrcOptReflGeffcken : public PndDrcOptReflAbs
{

 public:
 
  PndDrcOptReflGeffcken(); //! Empty constructor.
  

  // implementation of abstract base class function
  PndDrcOptReflGeffcken* Clone() const;

  

  /*! \brief Copy constructor
    \param s The reflectivity
  */
  PndDrcOptReflGeffcken(const PndDrcOptReflGeffcken& s);

  /*! \brief Assignment operator.
    \param s The object to assign.
  */
  PndDrcOptReflGeffcken& operator=(const PndDrcOptReflGeffcken& s);

  //! Destructor.
  virtual ~PndDrcOptReflGeffcken();


  // implementation of abstract base class function
  const Drc::Reflectivity Query(const PndDrcPhoton&    ph,
				const XYZVector        normal,
				const double           n_next     = 1,
				const Drc::ReflDir     direction = Drc::ReflOut) const;


  /*! \brief Probability for photon reflection at surface 

  used for mirror surfaces or surfaces with internal reflection.
  \param ph The photon
  \param normal The normal vector of the surface.
  \param n_next Refractive index of next medium.
  \param direction Photon leaving or entering volume.
  \return Reflection probability probability.

  The refractive index of the actual medium is accessible via 
  \sa PndDrcPhoton::Device()

  */
  const double ReflProb(const PndDrcPhoton&    ph,
			const XYZVector        normal,
			const double           n_next     = 1,
			const Drc::ReflDir     direction = Drc::ReflOut) const;

  
  

  protected:
  vector<PndDrcOptMatAbs*>     fLayerMaterialVector;                 //!< Layers of material
  vector<double>               fLayerThicknessVector;                //!< Layer thicknesses [nm]
  PndDrcOptMatAbs*             fLayerMaterialLow;                    //!< Low refractive index material.
  PndDrcOptMatAbs*             fLayerMaterialHigh;                   //!< High refractive index material.
  bool                         fRefIndConst;                         //!< Switch for constant refractive index.
  

  private:
  /*! \brief Copy function for assigment and copy operator.
    \param s The reflectivity
  */
  void Copy(const PndDrcOptReflGeffcken& s);
  



  public:
  
  /*! \brief Set refractive indices to constant value.


  This feature is good for comparing reflectivity plots with results from literature.
  The default refrative index of materials is taken which is returned by the material
  classes for negative wavelengths.

  \param sw True of false
  */
  void SetRefIndConst(bool sw=true) {fRefIndConst=sw;};
};
#endif