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 #include <map>
 
 #include "G4SystemOfUnits.hh"
 
 #ifndef _PFRICH_MATERIALS_
 #define _PFRICH_MATERIALS_
 
 class G4Element;
 class G4Material;
 class G4RadiatorMaterial;
 
 #include <CherenkovWaveLengthRange.h>
   
 // Uncomment to disable Rayleigh scattering and / or absorption by hand; 
 //#define _DISABLE_RAYLEIGH_SCATTERING_
 //#define _DISABLE_ABSORPTION_
 
 // Eventually this is a single place where these two are defined;
 #define _INCH_                             (25.4*mm)
 #define _MIL_                          (_INCH_/1000)
 
 // -- Aerogel ---------------------------------------------------------------------------------
 //
 #define _AEROGEL_BELLE_II_SMALL_REFRACTIVE_INDEX_ 0
 #define _AEROGEL_BELLE_II_LARGE_REFRACTIVE_INDEX_ 1
 #define _AEROGEL_BELLE_II_REFRACTIVE_INDEX_1_04_  2
 // FIXME: this does not look nice, but suffices;
 #define _AEROGEL_CLAS12_DENSITY_155_MG_CM3_     155
 #define _AEROGEL_CLAS12_DENSITY_225_MG_CM3_     225
 
 // If uncommented: fixed refractive index, no attenuation (single-layer CLAS12 config only);
 //#define _AEROGEL_FIXED_REFRACTIVE_INDEX_    (1.044)
 // --------------------------------------------------------------------------------------------
 
 // -- Acrylic filter --------------------------------------------------------------------------
 //
 #define _ACRYLIC_WL_CUTOFF_                 (300*nm)
 
 // Does not need to be precise;
 #define _ACRYLIC_DENSITY_               (1.18*g/cm3)
 
 // If uncommented: fixed refractive index, no attenuation; 
 //#define _ACRYLIC_FIXED_REFRACTIVE_INDEX_      (1.50)
 // --------------------------------------------------------------------------------------------
 
 // -- Carbon fiber honeycomb sandwich ---------------------------------------------------------
 //
 // Rad. length of the carbon fiber, epoxy glue and honeycomb as provided by 
 // Prakhar on 02/25/2023;
 #define _CF_RAD_LENGTH_                    (23.4*cm)
 #define _EG_RAD_LENGTH_                    (35.7*cm)
 #define _HC_RAD_LENGTH_                   (845.4*cm)
 // Used only in the material composition calculation;
 #define _CF_THICKNESS_                    (10*_MIL_)
 #define _EG_THICKNESS_                    (10*_MIL_)
 
 #define _FR4_RAD_LENGTH_                   (19.4*cm)
 // --------------------------------------------------------------------------------------------
 
 // -- Wavelength range ------------------------------------------------------------------------
 //
 // "Nominal" wavelength at which average refractive index will be calculated; FIXME: remove;
 // should rather store a fine step n(nu) lookup table in the CherenkovRadiator structure
 // after the GEANT pass; the problem is that n(<lambda>) is needed not only for the active 
 // radiator, where calibration photons are readily available, but also for say quartz to 
 // calculate the optical path correctly (and photon generation in the window may be suppressed); 
 //#define _LAMBDA_NOMINAL_                     (470.0)
 #define _LAMBDA_NOMINAL_                     (365.0)
 #define _MAGIC_CFF_                         (1239.8)
 
 // As 2023/03/09 consider wavelength range from 150um to 800um; 
 #define _WLDIM_                                  27
 #define _LAMBDA_MIN_                         (150.0)
 #define _LAMBDA_MAX_                         (800.0)
 #define _NU_MIN_       (eV*_MAGIC_CFF_/_LAMBDA_MAX_)
 #define _NU_MAX_       (eV*_MAGIC_CFF_/_LAMBDA_MIN_)
 #define _NU_STEP_ ((_NU_MAX_ - _NU_MIN_)/(_WLDIM_-1))
 // --------------------------------------------------------------------------------------------
 
 // FIXME: this needs to be verified (and actually the QE at normal incidence renormalized); 
 // The problem here is that when the QE is measured on a test stand, a fraction of photons 
 // actually bounces back off the window-photocathode boundary (I think); since this same 
 // bouncing is then taken care by GEANT, a double counting must occur; just making this 
 // refractive index more or less equal to the window one would solve the normalization problem, 
 // but will also eliminate bouncing all together, which is not realistic either since a 
 // non-negligible number of photons (especially in case of a photon flash produced in a 
 // window) actually *will* be bouncing in the window, moving away from their initial 
 // impact (creation) point;   
 #define _BIALKALI_REFRACTIVE_INDEX_           (2.80)//(1.47)
 
 class Materials: public CherenkovWaveLengthRange {
 public:
   Materials();
   virtual ~Materials() {};
 
   // The only two needed outside of the DetectorConstruction class;
   G4RadiatorMaterial *Nitrogen( void )    { return m_Nitrogen; };
   G4RadiatorMaterial *FusedSilica( void ) { return m_FusedSilica; };
   G4Material *Absorber( void )            { return m_Absorber; };
 
  protected:
   void DefineElements( void );
   void DefineMaterials( void );
 
   // Basic elements;
   G4Element *m_C, *m_N, *m_O, *m_F, *m_H, *m_Si, *m_K, *m_Na, *m_Sb, *m_Al, *m_Ca;
 
   // Materials;
   G4Material *m_Air, *m_Absorber, *m_Bialkali, *m_Aluminum, *m_CarbonFiber, *m_Ceramic, *m_Silver, *m_Titanium;
   // Fake carbon to calibrate radiation length of the honeycomb samples; will be created 
   // consisting of pure carbon, density 1g/cm^3; 
   G4Material *m_FakeCarbon_1_g_cm3; 
   // A honeycomb sandwich with epoxy glue (10mil+10mil+1/2"+10mil+10mil), or a 1/4"-based combination;
   G4Material *m_HalfInch_CF_HoneyComb, *m_QuarterInch_CF_HoneyComb;  
   // FR4 imitation with appropriate rad. length;
   G4Material *m_FR4, *m_Water, *m_Copper, *m_Silicon, *m_Delrin, *m_PEEK;
 
   G4RadiatorMaterial *m_Nitrogen, *m_Acrylic, *m_FusedSilica, *m_C2F6, *m_Sapphire;
   std::map<unsigned, G4RadiatorMaterial*> m_Aerogel;
 };
 
 #endif

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