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// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4eeToHadronsModel
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 25.10.2003
//
// Modifications:
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 18-05-05 Use optimized interfaces (V.Ivantchenko)
//

//
// Class Description:
//

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

#ifndef G4eeToHadronsModel_h
#define G4eeToHadronsModel_h 1

#include "G4VEmModel.hh"

class G4PhysicsVector;
class G4Vee2hadrons;

class G4eeToHadronsModel : public G4VEmModel
{

public:

  explicit G4eeToHadronsModel(G4Vee2hadrons*, G4int ver=0,
                              const G4String& nam = "eeToHadrons");

  ~G4eeToHadronsModel() override;

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

  G4double CrossSectionPerVolume(const G4Material*,
				 const G4ParticleDefinition*,
				 G4double kineticEnergy,
				 G4double cutEnergy,
				 G4double maxEnergy) override;

  G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
                                      G4double kineticEnergy,
                                      G4double Z, G4double A,
                                      G4double cutEnergy = 0.0,
                                      G4double maxEnergy = DBL_MAX) override;

  G4double ComputeCrossSectionPerElectron(const G4ParticleDefinition*,
                                          G4double kineticEnergy,
                                          G4double cutEnergy = 0.0,
                                          G4double maxEnergy = DBL_MAX);

  void SampleSecondaries(std::vector<G4DynamicParticle*>*,
			 const G4MaterialCutsCouple*,
			 const G4DynamicParticle*,
			 G4double tmin = 0.0,
			 G4double maxEnergy = DBL_MAX) override;

  G4DynamicParticle* GenerateCMPhoton(G4double);

  inline G4double PeakEnergy() const;

  // hide assignment operator
  G4eeToHadronsModel & operator=(const  G4eeToHadronsModel &right) = delete;
  G4eeToHadronsModel(const  G4eeToHadronsModel&) = delete;

private:

  void ComputeCMCrossSectionPerElectron();

  const G4ParticleDefinition* theGamma;

  G4Vee2hadrons*        model;
  G4PhysicsVector*      crossPerElectron = nullptr;
  G4PhysicsVector*      crossBornPerElectron = nullptr;

  G4double              lowKinEnergy;
  G4double              peakKinEnergy;
  G4double              highKinEnergy;

  G4double              emin;
  G4double              epeak;
  G4double              emax;

  G4int                 nbins = 100;
  G4int                 verbose;
  G4bool                isInitialised = false;
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

inline G4double G4eeToHadronsModel::PeakEnergy() const
{
  return peakKinEnergy;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#endif