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// -------------------------------------------------------------------
//
// Geant4 Class header file
//
// File name:     G4PolarizedAnnihilation
//
// Author:   A. Schaelicke on base of Vladimir Ivanchenko / Michel Maire code
//
// Class Description:
//  Polarized process of e+ annihilation into 2 gammas
//
// -------------------------------------------------------------------

#ifndef G4PolarizedAnnihilation_h
#define G4PolarizedAnnihilation_h 1

#include "globals.hh"
#include "G4eplusAnnihilation.hh"

class G4PolarizedAnnihilationModel;

class G4PolarizedAnnihilation : public G4eplusAnnihilation
{
 public:
  explicit G4PolarizedAnnihilation(const G4String& name = "pol-annihil");

  virtual ~G4PolarizedAnnihilation() override;

  virtual void ProcessDescription(std::ostream&) const override;
  virtual void DumpInfo() const override { ProcessDescription(G4cout); };

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

  virtual G4double PostStepGetPhysicalInteractionLength(
    const G4Track& track, G4double previousStepSize,
    G4ForceCondition* condition) override;

  virtual void BuildPhysicsTable(const G4ParticleDefinition&) override;

  G4PolarizedAnnihilation& operator=(const G4PolarizedAnnihilation& right) =
    delete;
  G4PolarizedAnnihilation(const G4PolarizedAnnihilation&) = delete;

 private:
  void CleanTables();

  void BuildAsymmetryTables(const G4ParticleDefinition& part);

  G4double ComputeAsymmetry(G4double energy, const G4MaterialCutsCouple* couple,
                            const G4ParticleDefinition& particle, G4double cut,
                            G4double& tasm);

  G4double ComputeSaturationFactor(const G4Track& aTrack);

  G4PolarizedAnnihilationModel* fEmModel;

  // table for cross section asymmetry
  G4PhysicsTable* fAsymmetryTable;
  // table for transverse cross section asymmetry
  G4PhysicsTable* fTransverseAsymmetryTable;
};

#endif