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//---------------------------------------------------------------
//  GEANT 4 class header file
//
//  GFlashSamplingShowerParameterisation
//
//  Class description:
//
//  GFlash concrete sampling shower parameterisation

// Author: Joanna Weng - 02.2004
//---------------------------------------------------------------
#ifndef GFlashSamplingShowerParameterisation_h
#define GFlashSamplingShowerParameterisation_h 1

#include "globals.hh"
#include "GFlashSamplingShowerTuning.hh"
#include "GVFlashShowerParameterisation.hh"

class G4Material;

class GFlashSamplingShowerParameterisation : public GVFlashShowerParameterisation
{
  public:
    GFlashSamplingShowerParameterisation(
      G4Material* aMat1, G4Material* aMat2, G4double d1, G4double d2,
      /// \param aMat1 passive material, \param dd1 - passive layer thickness
      /// \param aMat2 active material,  \param dd2 - acive layer thickness

      GFlashSamplingShowerTuning* aPar = 0);
    ~GFlashSamplingShowerParameterisation();

    void ComputeRadialParameters(G4double y, G4double Tau);
    void GenerateLongitudinalProfile(G4double Energy);
    void ComputeZAX0EFFetc();

    G4double IntegrateEneLongitudinal(G4double LongitudinalStep);
    G4double IntegrateNspLongitudinal(G4double LongitudinalStep);
    G4double ComputeTau(G4double LongitudinalPosition);
    void SetMaterial(G4Material* mat1, G4Material* mat2);
    G4double GeneratePhi();
    G4double GenerateRadius(G4int ispot, G4double Energy, G4double LongitudinalPosition);
    G4double GenerateExponential(G4double Energy);

    inline G4double GetAveR99() { return (3.5 * Rmeff); }
    inline G4double GetAveR90() { return (1.5 * Rmeff); }  // ok
    //
    inline G4double GetAveTmx() { return (X0eff * std::exp(AveLogTmax)); }
    inline G4double GetAveT99() { return (X0eff * AveLogTmax / (AveLogAlpha - 1.00)); }
    inline G4double GetAveT90() { return (2.5 * X0eff * std::exp(AveLogTmax)); }
    //
    inline G4double GetNspot() { return NSpot; }
    inline G4double GetX0() { return X0eff; }
    inline G4double GetEc() { return Eceff; }
    inline G4double GetRm() { return Rmeff; }
    inline G4double GetEffDensity() { return Rhoeff; }

    G4double ApplySampling(const G4double DEne, const G4double Energy);

  private:
    // medium related quantities
    //
    G4Material *material1, *material2;
    G4double density1, A1, Z1, X01, Ec1, Rm1, d1;
    G4double density2, A2, Z2, X02, Ec2, Rm2, d2;
    G4double Aeff, Rhoeff{1.0}, X0eff{1.0}, Eceff{1.0}, Rmeff{1.0}, Fs, ehat, Zeff;

    // Resolution
    //
    G4double ConstantResolution;
    G4double NoiseResolution;
    G4double SamplingResolution;

    // parametrization parameters
    //
    GFlashSamplingShowerTuning* thePar;

    // Cashed parameters:
    // Longitudinal Coefficients for a homogenious calo
    //
    G4double ParAveT1, ParAveT2;
    G4double ParAveA1, ParAveA2, ParAveA3;
    G4double ParSigLogT1, ParSigLogT2;
    G4double ParSigLogA1, ParSigLogA2;
    G4double ParRho1, ParRho2;

    // Cashed parameters:
    //  Longitudinal Coefficients for a sampling calo
    //
    G4double ParsAveT1, ParsAveT2;
    G4double ParsAveA1, ParsAveA2;
    G4double ParsSigLogT1, ParsSigLogT2;
    G4double ParsSigLogA1, ParsSigLogA2;
    G4double ParsRho1, ParsRho2;
    void ComputeLongitudinalParameters(G4double y);
    void GenerateEnergyProfile(G4double y);
    void GenerateNSpotProfile(G4double y);

    // Radial Coefficients homo
    //
    G4double ParRC1, ParRC2, ParRC3, ParRC4;
    G4double ParWC1, ParWC2, ParWC3;
    G4double ParWC4, ParWC5, ParWC6;
    G4double ParRT1, ParRT2, ParRT3, ParRT4;
    G4double ParRT5, ParRT6;

    // Radial Coefficients sampling
    //
    G4double ParsRC1, ParsRC2;
    G4double ParsWC1, ParsWC2;
    G4double ParsRT1, ParsRT2;

    // Spot multiplicity Coefficients
    //
    G4double ParsSpotT1, ParsSpotT2, ParsSpotA1, ParsSpotA2;
    G4double ParsSpotN1, ParsSpotN2;

    // PARAMETRISATION variables (Energy & position dependent)
    // Longitudinal
    // homogeneous
    //
    G4double AveLogAlphah, AveLogTmaxh;
    G4double SigmaLogAlphah, SigmaLogTmaxh;
    G4double Rhoh;
    G4double Alphah, Tmaxh, Betah;

    // PARAMETRISATION variables (Energy & position dependent)
    // Longitudinal
    // sampling
    //
    G4double AveLogAlpha, AveLogTmax;
    G4double SigmaLogAlpha, SigmaLogTmax;
    G4double Rho;
    G4double Alpha, Tmax, Beta;

    // Multiplicity
    //
    G4double NSpot, AlphaNSpot, TNSpot, BetaNSpot;

    // Radial
    //
    G4double RadiusCore, WeightCore, RadiusTail;
};

#endif