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// $Id: G4DNASecondOrderReaction.hh 64057 2012-10-30 15:04:49Z gcosmo $
//
// Author: Mathieu Karamitros (kara (AT) cenbg . in2p3 . fr)
//
// WARNING : This class is released as a prototype.
// It might strongly evolve or even disapear in the next releases.
//
// History:
// -----------
// 16 March 2012 M.Karamitros created
//
// -------------------------------------------------------------------

#ifndef G4DNASECONDORDERREACTION_HH
#define G4DNASECONDORDERREACTION_HH

#include "G4VITProcess.hh"

class G4MolecularConfiguration;

class G4DNASecondOrderReaction : public G4VITProcess
{
public:
    G4DNASecondOrderReaction(const G4String& aName =  "DNASecondOrderReaction",
                             G4ProcessType type = fDecay);
    virtual ~G4DNASecondOrderReaction();

    G4IT_ADD_CLONE(G4VITProcess,G4DNASecondOrderReaction)

    G4DNASecondOrderReaction(const G4DNASecondOrderReaction&);
    G4DNASecondOrderReaction& operator=(const G4DNASecondOrderReaction&);
    void StartTracking(G4Track*);

    void SetReaction(const G4MolecularConfiguration*, const G4Material*, double /*reactionRate*/);

public :
   virtual void BuildPhysicsTable(const G4ParticleDefinition&);
   virtual G4double PostStepGetPhysicalInteractionLength(
                           const G4Track& track,
               G4double   previousStepSize,
               G4ForceCondition* condition
              );

   virtual G4VParticleChange* PostStepDoIt(
               const G4Track& ,
               const G4Step&
              );

   virtual G4double AtRestGetPhysicalInteractionLength(
                           const G4Track& ,
               G4ForceCondition*
              ){ return -1.0; }

   virtual G4VParticleChange* AtRestDoIt(
               const G4Track& ,
               const G4Step&
              ){return 0;}

   //  no operation in  AlongStepDoIt
   virtual G4double AlongStepGetPhysicalInteractionLength(
                           const G4Track&,
               G4double  ,
               G4double  ,
               G4double& ,
                           G4GPILSelection*
                          ){ return -1.0; }

   //  no operation in  AlongStepDoIt
   virtual G4VParticleChange* AlongStepDoIt(
               const G4Track& ,
               const G4Step&
                          ) {return 0;}

protected:
    struct SecondOrderReactionState : public G4ProcessState
    {
        SecondOrderReactionState();
        virtual ~SecondOrderReactionState(){;}
        G4double fPreviousTimeAtPreStepPoint;
        G4bool fIsInGoodMaterial;
    };

private :
    void Create();

protected:
    G4bool fIsInitialized;

    G4double fReturnedValue;

    const std::vector<double>* fpMoleculeDensity;
    G4double fReactionRate;
    G4double fConcentration;
    G4double fMolarMassOfMaterial;
    SecondOrderReactionState*& fpSecondOrderReactionState;
    G4ParticleChange fParticleChange;

    const G4MolecularConfiguration* fpMolecularConfiguration;
    const G4Material* fpMaterial;
};

#endif // G4DNASECONDORDERREACTION_HH