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//
// $Id: G4MuPairProduction.hh,v 1.18 2004/02/10 18:07:23 vnivanch Exp $
// GEANT4 tag $Name: geant4-06-01 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4MuPairProduction
//
// Author:        Laszlo Urban
//
// Creation date: 30.05.1998
//
// Modifications:

// 10-02-00 modifications , new e.m. structure, L.Urban
// 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 29-10-01 all static functions no more inlined (mma)
// 10-05-02 V.Ivanchenko update to new design
// 26-12-02 secondary production moved to derived classes (VI)
// 27-01-03 Make models region aware (V.Ivanchenko)
// 05-02-03 Fix compilation warnings (V.Ivanchenko)
// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
// 08-08-03 STD substitute standard  (V.Ivanchenko)
// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
// 21-01-04 Migrade to G4ParticleChangeForLoss (V.Ivanchenko)
//
// Class Description:
//
// This class manages the PairProduction process for muons.
// it inherites from G4VContinuousDiscreteProcess via G4VEnergyLossProcess.
//

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

#ifndef G4MuPairProduction_h
#define G4MuPairProduction_h 1

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

#include "globals.hh"
#include "G4VEnergyLossProcess.hh"

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

class G4MuPairProduction : public G4VEnergyLossProcess

{
public:

  G4MuPairProduction(const G4String& processName = "MuPairProd");

  ~G4MuPairProduction();

  G4bool IsApplicable(const G4ParticleDefinition& p)
            {return (p.GetPDGCharge() != 0.0 && p.GetPDGMass() > 10.0*MeV);};

  virtual G4double MinPrimaryEnergy(const G4ParticleDefinition* p,
                                    const G4Material*, G4double cut);

  virtual std::vector<G4Track*>* SecondariesAlongStep(
                             const G4Step&,
			           G4double&,
			           G4double&,
                                   G4double&);

  virtual void SecondariesPostStep(
                                   G4VEmModel*,
                             const G4MaterialCutsCouple*,
                             const G4DynamicParticle*,
                                   G4double&,
                                   G4double&);
  
  void SetSubCutoff(G4bool val);

  void PrintInfoDefinition();
  // Print out of the class parameters

protected:

  const G4ParticleDefinition* DefineBaseParticle(const G4ParticleDefinition* p);

  virtual G4double MaxSecondaryEnergy(const G4DynamicParticle* dp);

private:

  void InitialiseProcess();


  G4MuPairProduction & operator=(const G4MuPairProduction &right);
  G4MuPairProduction(const G4MuPairProduction&);

  const G4ParticleDefinition* theParticle;
  const G4ParticleDefinition* theBaseParticle;

  G4double                    lowestKinEnergy;
  G4bool                      subCutoff;

};

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

inline G4double G4MuPairProduction::MinPrimaryEnergy(const G4ParticleDefinition*,
                                                     const G4Material*,
                                                           G4double)
{
  return lowestKinEnergy;
}

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

inline G4double G4MuPairProduction::MaxSecondaryEnergy(const G4DynamicParticle* dp)
{
  return dp->GetKineticEnergy();
}

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

#include "G4VSubCutoffProcessor.hh"

inline std::vector<G4Track*>*  G4MuPairProduction::SecondariesAlongStep(
                           const G4Step&   step,
	             	         G4double& tmax,
			         G4double& eloss,
                                 G4double& kinEnergy)
{
  std::vector<G4Track*>* newp = 0;
  if(subCutoff) {
    G4VSubCutoffProcessor* sp = SubCutoffProcessor(CurrentMaterialCutsCoupleIndex());
    if (sp) {
      G4VEmModel* model = SelectModel(kinEnergy);
      newp = sp->SampleSecondaries(step,tmax,eloss,model);
    }
  }
  return newp;
}

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

#include "G4VEmModel.hh"

inline void G4MuPairProduction::SecondariesPostStep(
                                   G4VEmModel* model,
                             const G4MaterialCutsCouple* couple,
                             const G4DynamicParticle* dp,
                                   G4double& tcut,
                                   G4double& kinEnergy)
{
  std::vector<G4DynamicParticle*>* newp =
         model->SampleSecondaries(couple, dp, tcut, kinEnergy);

  fParticleChange.SetNumberOfSecondaries(2);
  G4DynamicParticle* elpos = (*newp)[0];
  fParticleChange.AddSecondary(elpos);
  kinEnergy -= elpos->GetKineticEnergy();
  elpos = (*newp)[1];
  fParticleChange.AddSecondary(elpos);
  kinEnergy -= elpos->GetKineticEnergy();
  delete newp;
}

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

#endif