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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4MuBremsstrahlungModel
//
// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
// 
// Creation date: 18.05.2002
//
// Modifications:
//
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 27-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add name (V.Ivanchenko)
// 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 13-02-06 Add ComputeCrossSectionPerAtom (mma)
// 11-10-07 Add ignoreCut flag (V.Ivanchenko) 
// 28-02-08 Reorganized protected methods and members (V.Ivanchenko) 
// 06-03-08 Remove obsolete methods and members (V.Ivanchenko) 
// 31-05-13 Use element selectors instead of local data (V.Ivanchenko)
//

//
// Class Description:
//
// Implementation of bremssrahlung by muons

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

#ifndef G4MuBremsstrahlungModel_h
#define G4MuBremsstrahlungModel_h 1

#include <CLHEP/Units/PhysicalConstants.h>

#include "G4VEmModel.hh"
#include "G4NistManager.hh"

class G4Element;
class G4ParticleChangeForLoss;

class G4MuBremsstrahlungModel : public G4VEmModel
{

public:

  explicit G4MuBremsstrahlungModel(const G4ParticleDefinition* p = nullptr,
                          const G4String& nam = "MuBrem");

  ~G4MuBremsstrahlungModel() = default;

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

  virtual void InitialiseLocal(const G4ParticleDefinition*,
			       G4VEmModel* masterModel) override;

  virtual G4double MinEnergyCut(const G4ParticleDefinition*,
				const G4MaterialCutsCouple*) override;
			      
  virtual G4double ComputeCrossSectionPerAtom(
				 const G4ParticleDefinition*,
				 G4double kineticEnergy,
				 G4double Z, G4double A,
				 G4double cutEnergy,
				 G4double maxEnergy) override;
				 			       
  virtual G4double ComputeDEDXPerVolume(const G4Material*,
                                const G4ParticleDefinition*,
                                G4double kineticEnergy,
                                G4double cutEnergy) override;
			      
  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
				 const G4MaterialCutsCouple*,
				 const G4DynamicParticle*,
				 G4double tmin,
				 G4double maxEnergy) override;

  inline void SetLowestKineticEnergy(G4double e);

  virtual G4double MinPrimaryEnergy(const G4Material*,
         const G4ParticleDefinition*, 
         G4double) override;

protected:

  G4double ComputMuBremLoss(G4double Z, G4double tkin, G4double cut);
  
  G4double ComputeMicroscopicCrossSection(G4double tkin,
					  G4double Z,
					  G4double cut);

  virtual G4double ComputeDMicroscopicCrossSection(G4double tkin,
						   G4double Z,
						   G4double gammaEnergy);

  inline void SetParticle(const G4ParticleDefinition*);

private:

  // hide assignment operator
  G4MuBremsstrahlungModel & 
    operator=(const  G4MuBremsstrahlungModel &right) = delete;
  G4MuBremsstrahlungModel(const  G4MuBremsstrahlungModel&) = delete;

protected:

  const G4ParticleDefinition* particle;
  G4NistManager* nist;
  G4double mass;
  G4double rmass;
  G4double cc;
  G4double coeff;
  G4double sqrte;
  G4double bh;
  G4double bh1;
  G4double btf;
  G4double btf1;

  G4ParticleDefinition*       theGamma;
  G4ParticleChangeForLoss*    fParticleChange;

  G4double lowestKinEnergy;
  G4double minThreshold;

  static const G4double xgi[6];
  static const G4double wgi[6];

  static G4double fDN[93];
};

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

inline void G4MuBremsstrahlungModel::SetLowestKineticEnergy(G4double e) 
{
  lowestKinEnergy = e;
}

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

inline
void G4MuBremsstrahlungModel::SetParticle(const G4ParticleDefinition* p)
{
  if(!particle) {
    particle = p;
    mass = particle->GetPDGMass();
    rmass=mass/CLHEP::electron_mass_c2 ;
    cc=CLHEP::classic_electr_radius/rmass ;
    coeff= 16.*CLHEP::fine_structure_const*cc*cc/3. ;
  }
}

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

#endif
