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// ********************************************************************
//
//  CaTS (Calorimetry and Tracking Simulation)
//
//  Authors : Hans Wenzel
//            Soon Yung Jun
//            (Fermi National Accelerator Laboratory)
//
// History
//   October 18th, 2021 : first implementation
//
// ********************************************************************
//
/// \file RootIO.hh
/// \brief Definition of the CaTS::RootIO class

#ifdef WITH_ROOT
#pragma once

#include "RtypesCore.h"
#include <G4Types.hh>
#include "G4ThreadLocalSingleton.hh"

class TFile;
class TTree;
class TBranch;
class Event;

class RootIO {
    friend class G4ThreadLocalSingleton< RootIO >;
public:
    virtual ~RootIO()= default;
    static RootIO* GetInstance();
    void Write(Event*);
    void Close();
    void Merge();
protected:
    RootIO();

private:
    TFile* fFile{ nullptr };
    G4int fNevents{ 0 };
    TTree* ftree{ nullptr };
    TBranch* fevtbranch{ nullptr };
    Long64_t fnb{ 0 };
    G4bool fevtinitialized{ false };
    static G4ThreadLocal RootIO* fgInstance;
};
#endif /* WITH_ROOT */