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// -------------------------------------------------------------------
//
// Geant4 Class header file
//
// File name:     G4PolarizedCompton
//
// Author:        Andreas Schaelicke
//                based on code by Michel Maire / Vladimir IVANTCHENKO
//
// Class description
//   polarized version of Compton scattering
//
// -----------------------------------------------------------------------------

#ifndef PolarizedComptonScattering_h
#define PolarizedComptonScattering_h 1

#include "globals.hh"
#include "G4Gamma.hh"
#include "G4VEmProcess.hh"

class G4DynamicParticle;
class G4MaterialCutsCouple;
class G4ParticleDefinition;
class G4PolarizedComptonModel;

class G4PolarizedCompton : public G4VEmProcess

{
 public:
  explicit G4PolarizedCompton(const G4String& processName = "pol-compt",
                              G4ProcessType type          = fElectromagnetic);

  virtual ~G4PolarizedCompton() override;

  // true for Gamma only.
  virtual G4bool IsApplicable(const G4ParticleDefinition&) override;

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

  void SetModel(const G4String& name);

  G4PolarizedCompton& operator=(const G4PolarizedCompton& right) = delete;
  G4PolarizedCompton(const G4PolarizedCompton&)                  = delete;

 protected:
  virtual void InitialiseProcess(const G4ParticleDefinition*) override;

  virtual void BuildPhysicsTable(const G4ParticleDefinition&) override;

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

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

 private:
  static G4PhysicsTable* theAsymmetryTable;  // table for crosssection asymmetry
  void CleanTable();

  void BuildAsymmetryTable(const G4ParticleDefinition& part);

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

  G4double ComputeSaturationFactor(const G4Track& aTrack);

  G4PolarizedComptonModel* fEmModel;

  G4int fType;

  G4bool fBuildAsymmetryTable;
  G4bool fUseAsymmetryTable;

  G4bool fIsInitialised;
};

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#endif