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#ifndef G4FieldPropagation_h
#define G4FieldPropagation_h 1

#include "G4KineticTrackVector.hh"

class G4FieldPropagation 
{
public:
   G4FieldPropagation() {}
   G4FieldPropagation(const G4FieldPropagation &) {}

   virtual ~G4FieldPropagation() {}

   // Operators
   const G4FieldPropagation & operator=(const G4FieldPropagation &right);

   int operator==(const G4FieldPropagation &right) const;
   int operator!=(const G4FieldPropagation &right) const;

    // Methods

   // only theActive are propagated, nothing else
   // only theSpectators define the field, nothing else
   virtual void Transport(G4KineticTrackVector &theActive, const G4KineticTrackVector &theSpectators, G4double theTimeStep) = 0;

   virtual G4double GetExcitationEnergy(G4int nHit, const G4KineticTrackVector &theParticles) = 0;
   
   // methods for calculating potentials for different types of particles
   virtual void Init(G4int z, G4int a) = 0; // prepare potentials' functions
   
   // aPosition is relative to the nucleus center
   virtual G4double GetNeutronPotential(G4double radius) = 0;
   virtual G4double GetNeutronPotential(G4ThreeVector &aPosition) = 0;
   
   virtual G4double GetProtonPotential(G4double radius) = 0;
   virtual G4double GetProtonPotential(G4ThreeVector &aPosition) = 0;
    
   virtual G4double GetAntiprotonPotential(G4double radius) = 0;
   virtual G4double GetAntiprotonPotential(G4ThreeVector &aPosition) = 0;

   virtual G4double GetKaonPotential(G4double radius) = 0;
   virtual G4double GetKaonPotential(G4ThreeVector &aPosition) = 0;
   
   virtual G4double GetPionPotential(G4double radius) = 0;
   virtual G4double GetPionPotential(G4ThreeVector &aPosition) = 0;
};

#endif // G4FieldPropagation_h