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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4BetheHeitler5DModel
//
// Authors:
// Igor Semeniouk and Denis Bernard,
// LLR, Ecole polytechnique & CNRS/IN2P3, 91128 Palaiseau, France
//
// Modifications:
// 27-10-17 New class (IgS)
// 19-01-18 version that calculates the pdf in the same way as in the fortran
//          version (Denis Bernard)
// 04-06-18 Performance optimization of the final state sampling (M. Novak)
// 10-04-19 CLHEP for boost and rotation, remove local functions (IgS)
// 02-09-19 Set base class to be G4PairProductionRelModel that can provide 
//          accurate sections now from threshold to very high energies
//          including the LPM effect. (M. Novak)
// 14-10-19 Muon's pair genaration in SampleSecondaries
//
// Class Description:
//
// Implementation of gamma conversion to e+e- in the field of a nucleus
//

// -------------------------------------------------------------------
//

#ifndef G4BetheHeitler5DModel_h
#define G4BetheHeitler5DModel_h 1

#include "G4PairProductionRelModel.hh"

class G4IonTable;

class G4BetheHeitler5DModel : public G4PairProductionRelModel
{

public:

  explicit G4BetheHeitler5DModel(const G4ParticleDefinition* p = nullptr,
                                 const G4String& nam = "BetheHeitler5D");

  ~G4BetheHeitler5DModel() override;

  void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;

  void SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
                         const G4MaterialCutsCouple* couple,
                         const G4DynamicParticle* aDynamicGamma,
                         G4double, G4double) override;

  inline void SetVerbose(G4int val) { fVerbose = val; }

  // Only e+, e+ or mu+, mu- pairs supported
  void SetLeptonPair(const G4ParticleDefinition* p1,
		     const G4ParticleDefinition* p2);

  // hide assignment operator
  G4BetheHeitler5DModel& operator=(const G4BetheHeitler5DModel& right) = delete;
  G4BetheHeitler5DModel(const  G4BetheHeitler5DModel&) = delete;

private:

  G4double MaxDiffCrossSection(const G4double* par, G4double eZ,
                               G4double e, G4double loge) const;

  inline void SetConversionMode(G4int to) { fConvMode = to; }

  G4IonTable* theIonTable;

  const G4ParticleDefinition*  fLepton1;
  const G4ParticleDefinition*  fLepton2;

  const G4ParticleDefinition*  fTheMuPlus;
  const G4ParticleDefinition*  fTheMuMinus;

  G4int  fVerbose;
  G4int  fConversionType;
  G4int  fConvMode;
  G4bool iraw;
};
#endif