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//
// Hadronic Process: Nuclear De-excitations
// by V. Lara

#ifndef G4FermiPhaseSpaceDecay_hh
#define G4FermiPhaseSpaceDecay_hh


#include "G4LorentzVector.hh"
#include "G4ParticleMomentum.hh"
#include <CLHEP/Random/RandGamma.h>

#include <vector>
#include <cmath>

class G4FermiPhaseSpaceDecay
{
public:
  inline G4FermiPhaseSpaceDecay();
  inline ~G4FermiPhaseSpaceDecay();
  
  inline std::vector<G4LorentzVector*> * 
  Decay(const G4double,  const std::vector<G4double>&) const;

private:
  inline G4FermiPhaseSpaceDecay(const G4FermiPhaseSpaceDecay&);
  inline const G4FermiPhaseSpaceDecay & operator=(const G4FermiPhaseSpaceDecay &); 
  inline G4bool operator==(const G4FermiPhaseSpaceDecay&);
  inline G4bool operator!=(const G4FermiPhaseSpaceDecay&);

  inline G4double PtwoBody(G4double E, G4double P1, G4double P2) const;
  
  G4ParticleMomentum IsotropicVector(const G4double Magnitude = 1.0) const;

  inline G4double BetaKopylov(const G4int) const; 

  std::vector<G4LorentzVector*> * 
  TwoBodyDecay(const G4double, const std::vector<G4double>&) const;

  std::vector<G4LorentzVector*> * 
  NBodyDecay(const G4double, const std::vector<G4double>&) const;

  std::vector<G4LorentzVector*> * 
  KopylovNBodyDecay(const G4double, const std::vector<G4double>&) const;
};

#include "G4FermiPhaseSpaceDecay.icc"

#endif