ScintTimeLAr.h

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////////////////////////////////////////////////////////////////////////
// Class:       ScintTimeLAr
// Plugin Type: tool
// File:        ScintTimeLAr_tool.cc ScintTimeLAr.h
// Description:
// Generate a random number for timing of LAr scintillation
// Oct. 8 by Mu Wei
////////////////////////////////////////////////////////////////////////
#ifndef ScintTimeLAr_H
#define ScintTimeLAr_H

#include "larsim/PhotonPropagation/ScintTimeTools/ScintTime.h"

#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "art/Framework/Principal/Handle.h"
#include "art/Utilities/ToolMacros.h"
#include "fhiclcpp/ParameterSet.h"
#include "nurandom/RandomUtils/NuRandomService.h"
#include "messagefacility/MessageLogger/MessageLogger.h"

// Random number engine
#include "CLHEP/Random/RandFlat.h"
#include <string>

namespace phot
{
    class ScintTimeLAr : public ScintTime
    {
    public:
        explicit ScintTimeLAr(fhicl::ParameterSet const& pset);
        void GenScintTime(bool is_fast, CLHEP::HepRandomEngine& engine)  ;
        
    private:
        int           LogLevel;
        
        // parameters for the shape of argon scinitllation light time distribution
        double         SRTime;                        // PureLAr: rising time of slow LAr scinitllation;
        double         SDTime;                        // PureLAr: decay time of slow LAr scintillation;
        double         FRTime;                        // PureLAr: rising time of fast LAr scinitllation;
        double         FDTime;                        // PureLAr: decay time of fast LAr scintillation;
        
        // general functions
        double single_exp(double t, double tau2);
        double bi_exp(double t, double tau1, double tau2);        
    };
}
#endif