//
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//
#ifndef G4MoleculeCounter_h
#define G4MoleculeCounter_h

#include "G4Molecule.hh"
#include <map>
#include <memory>

struct compDoubleWithPrecision
{
    bool operator() (const double& a, const double& b) const
    {
        if(std::fabs(a - b) < fPrecision)
        {
            return false;
        }
        else
        {
            return a < b;
        }
    }

    static G4ThreadLocal double fPrecision ;
};

typedef std::map<G4double, G4int, compDoubleWithPrecision> NbMoleculeAgainstTime;

class G4MoleculeCounter
{
public:
	typedef std::map<G4Molecule, NbMoleculeAgainstTime> CounterMapType;

#if __cplusplus > 199711L && !defined __clang__
    typedef std::unique_ptr<std::vector<G4Molecule> > RecordedMolecules;
#else
    typedef std::auto_ptr<std::vector<G4Molecule> > RecordedMolecules;
#endif

protected:
    G4MoleculeCounter();
    virtual ~G4MoleculeCounter(){;}
    static G4ThreadLocal G4MoleculeCounter* fpInstance;

    CounterMapType fCounterMap;
    std::map<const G4MoleculeDefinition*, G4bool> fDontRegister ;
    static G4bool fUse;

    G4int fVerbose ;

    friend class G4Molecule;
    virtual void AddAMoleculeAtTime(const G4Molecule&, G4double);
    virtual void RemoveAMoleculeAtTime(const G4Molecule&, G4double);

public:
    static void DeleteInstance();

    static  G4MoleculeCounter* GetMoleculeCounter();
    inline const NbMoleculeAgainstTime& GetNbMoleculeAgainstTime(const G4Molecule &molecule);

    RecordedMolecules GetRecordedMolecules();

    /*
     * The dynamics of the given molecule won't be saved into memory.
     */
    inline virtual void DontRegister(const G4MoleculeDefinition*);
    inline virtual void RegisterAll();

    /*
     * If the molecule counter is used, it will be called
     * at every creation/deletion of a molecule to
     * to increase/decrease the number at a given time.
     */
    void Use(G4bool flag = true)
    {
        fUse=flag;
    }
    G4bool InUse()
    {
        return fUse;
    }

    inline void SetVerbose(G4int);
    inline G4int GetVerbose();

    /*
     * It sets the min time difference in between two time slices.
     */
    void SetTimeSlice(double);

    virtual void ResetCounter();
};

inline void G4MoleculeCounter::ResetCounter()
{
    fCounterMap.clear();
}

inline const NbMoleculeAgainstTime& G4MoleculeCounter::GetNbMoleculeAgainstTime(const G4Molecule& molecule)
{
    return fCounterMap[molecule];
}

inline void G4MoleculeCounter::SetVerbose(G4int level)
{
    fVerbose = level;
}

inline G4int G4MoleculeCounter::GetVerbose()
{
    return fVerbose ;
}

inline void G4MoleculeCounter::DontRegister(const G4MoleculeDefinition* molDef)
{
    fDontRegister[molDef] = true ;
}

inline void G4MoleculeCounter::RegisterAll()
{
    fDontRegister.clear();
}

#endif