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#ifndef G4MOLECULECOUNTERTIMECOMPARER_HH
#define G4MOLECULECOUNTERTIMECOMPARER_HH 1

#include <CLHEP/Units/PhysicalConstants.h>
#include "G4Types.hh"

#include <map>
#include <vector>

class G4MoleculeCounterTimeComparer
{
  public:
    enum TimeComparerType
    {
      FixedPrecision,
      VariablePrecision
    };

  public:
    G4MoleculeCounterTimeComparer();
    virtual ~G4MoleculeCounterTimeComparer() = default;

    G4MoleculeCounterTimeComparer(const G4MoleculeCounterTimeComparer&);
    G4MoleculeCounterTimeComparer& operator=(const G4MoleculeCounterTimeComparer&);

    void SetFixedPrecision(G4double);
    void SetVariablePrecision(const std::vector<G4double>&, const std::vector<G4double>&);
    void SetVariablePrecision(const std::map<G4double, G4double>&);

    G4double GetPrecisionAtTime(G4double) const;

    bool operator()(const G4double&, const G4double&) const;

  private:
    TimeComparerType fType;
    G4double fPrecision{1 * CLHEP::picosecond};
    std::map<G4double, G4double> fVariablePrecision{};

  public:  // Factory
    static G4MoleculeCounterTimeComparer CreateWithFixedPrecision(G4double);
    static G4MoleculeCounterTimeComparer CreateWithVariablePrecision(const std::map<G4double, G4double>&);
};

#endif