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/// \file DetectorMessenger.hh
/// \brief
#ifndef MolecularIRTDamageReactionModel_hh
#define MolecularIRTDamageReactionModel_hh

#include "G4LogicalVolume.hh"
#include "G4String.hh"
#include "G4ThreeVector.hh"
#include "G4VDNAHitModel.hh"
#include "globals.hh"

class DNAGeometry;

class G4DNAComponentNode;

class G4MolecularConfiguration;

class G4DNAMolecularReactionTable;

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class IRTDamageReactionModel : public G4VDNAHitModel
{
  public:
    explicit IRTDamageReactionModel(const G4String& name);

    ~IRTDamageReactionModel() override = default;

    IRTDamageReactionModel& operator=(const IRTDamageReactionModel& right) = delete;

    IRTDamageReactionModel(const IRTDamageReactionModel&) = delete;

    using DNANode = std::variant<const G4DNAComponentNode*, /*for dnadamage chain*/
                                 const G4VPhysicalVolume* /*for molecularDNA chain*/>;

    G4double CalculateReactionTime(const G4Track& trackA, DNANode&) override;

    G4bool DoReaction(const G4Track& track, const G4double&, const DNANode&) override;

  private:
    G4double GetTimeToEncounter(const G4MolecularConfiguration* molA,
                                const G4MolecularConfiguration* molB, const G4double& distance);

    void MakeReaction(const G4Track& track);

    void RecordDNADamage() const;

    const G4VPhysicalVolume* fpDNAPhyVolume = nullptr;
    const G4Track* fpTrack = nullptr;
    G4double fminTimeStep = DBL_MAX;
    G4double fReactionTime = DBL_MAX;
    DNAGeometry* fpDNAGeometry;
    const G4DNAMolecularReactionTable* fMolecularReactionTable;
};

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#endif