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//
// G4BOptnCloning
//
// Class Description:
//
// A G4VBiasingOperation to clone a track, allowing to set
// weight arbitrary weights.
//    
// Author: Marc Verderi, November 2013.
// --------------------------------------------------------------------
#ifndef G4BOptnCloning_hh
#define G4BOptnCloning_hh 1

#include "G4VBiasingOperation.hh"
#include "G4ParticleChange.hh"

class G4BOptnCloning : public G4VBiasingOperation
{
  public:

    // -- Constructor :
    G4BOptnCloning(const G4String& name);
    // -- destructor:
    virtual ~G4BOptnCloning();
  
    // -- Methods from G4VBiasingOperation interface:
    // -------------------------------------------
    // -- Unsed:
    virtual const G4VBiasingInteractionLaw*
    ProvideOccurenceBiasingInteractionLaw( const G4BiasingProcessInterface*,
                  G4ForceCondition& ) { return nullptr; }
    virtual G4VParticleChange*
    ApplyFinalStateBiasing( const G4BiasingProcessInterface*,
                  const G4Track*, const G4Step*, G4bool& ) { return nullptr; }
    // -- Used:
    virtual G4double
    DistanceToApplyOperation( const G4Track*,
                  G4double, G4ForceCondition* condition )
    {
      *condition = NotForced; return 0.; // -- acts immediately
    }
    virtual G4VParticleChange*
    GenerateBiasingFinalState( const G4Track*, const G4Step* );

    // -- Additional methods, specific to this class:
    // ----------------------------------------------
    void SetCloneWeights( G4double clone1Weight, G4double clone2Weight )
    {
      fClone1W = clone1Weight;
      fClone2W = clone2Weight;
    }

    G4Track* GetCloneTrack() const { return fCloneTrack; }

  private:

    G4double fClone1W = -1.0, fClone2W = -1.0;
    G4ParticleChange fParticleChange;
    G4Track* fCloneTrack = nullptr;
};

#endif