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////////////////////////////////////////////////////////////////////////////////
//  Class:    G4VAdjointReverseReaction
//  Author:         L. Desorgher
//  Organisation:   SpaceIT GmbH
//
//  Abstract class for adjoint/reverse discrete scattering
////////////////////////////////////////////////////////////////////////////////

#ifndef G4VAdjointReverseReaction_h
#define G4VAdjointReverseReaction_h 1

#include "globals.hh"
#include "G4VDiscreteProcess.hh"

class G4AdjointCSManager;
class G4ParticleChange;
class G4ParticleDefinition;
class G4Track;
class G4VEmAdjointModel;
class G4VParticleChange;

class G4VAdjointReverseReaction : public G4VDiscreteProcess
{
 public:
  explicit G4VAdjointReverseReaction(const G4String& process_name,
                                     G4bool whichScatCase);

  ~G4VAdjointReverseReaction() override;

  void BuildPhysicsTable(const G4ParticleDefinition&) override;

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

  G4VAdjointReverseReaction(G4VAdjointReverseReaction&) = delete;
  G4VAdjointReverseReaction& operator=(
    const G4VAdjointReverseReaction& right) = delete;

 protected:
  G4double GetMeanFreePath(const G4Track& track,
                           G4double previousStepSize,
                           G4ForceCondition* condition) override;

  G4VEmAdjointModel* fAdjointModel = nullptr;
  G4bool fIsScatProjToProj;

 private:

  G4ParticleChange* fParticleChange;
  G4AdjointCSManager* fCSManager;

  G4int fTrackId = 0;

  G4bool fIsFwdCSUsed = false;
};

#endif