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// ---------------------------------------------------------------
//  GEANT 4 class header file
//
//  GFlashHomoShowerParameterisation
//
//  Class description:
//
//  GFlash homogeneous shower parameterisation.

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

#include "globals.hh"
#include "GVFlashHomoShowerTuning.hh"
#include "GVFlashShowerParameterisation.hh"

class G4Material;

class GFlashHomoShowerParameterisation : public GVFlashShowerParameterisation
{
  public:  // with description
    GFlashHomoShowerParameterisation(G4Material* aMat, GVFlashHomoShowerTuning* aPar = 0);
    ~GFlashHomoShowerParameterisation();

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

    G4double IntegrateEneLongitudinal(G4double LongitudinalStep);
    G4double IntegrateNspLongitudinal(G4double LongitudinalStep);
    G4double ComputeTau(G4double LongitudinalPosition);

    G4double GeneratePhi();
    G4double GenerateRadius(G4int ispot, G4double Energy, G4double LongitudinalPosition);
    G4double GenerateExponential(G4double Energy);
    void SetMaterial(G4Material* mat);

    inline G4double GetAveR99() { return (3.5 * Rm); }
    inline G4double GetAveR90() { return (1.5 * Rm); }  // ok

    inline G4double GetAveTmx() {return (X0 * std::exp(AveLogTmaxh));}
    inline G4double GetAveT99() {return (X0 * AveLogTmaxh/(AveLogAlphah-1.00));}
    inline G4double GetAveT90() {return (2.5* X0*std::exp( AveLogTmaxh) );}

    inline   G4double GetNspot(){ return NSpot;}
    inline G4double GetX0() { return X0; }
    inline G4double GetEc() { return Ec; }
    inline G4double GetRm() { return Rm; }

  private:
    G4Material* material;

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

    // parametrization parameters
    GVFlashHomoShowerTuning* thePar;

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

    void ComputeLongitudinalParameters(G4double y);
    void GenerateEnergyProfile(G4double y);
    void GenerateNSpotProfile(G4double y);

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

    // Spot multiplicity Coefficients
    G4double ParSpotT1, ParSpotT2, ParSpotA1, ParSpotA2;
    G4double ParSpotN1, ParSpotN2;

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

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

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

#endif