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/// \file eventgenerator/pythia/decayer6/include/G4Pythia6Decayer.hh
/// \brief Definition of the G4Pythia6Decayer class
//
#ifndef G4_PYTHIA6_DECAYER_H
#define G4_PYTHIA6_DECAYER_H

#include "G4VExtDecayer.hh"
#include "G4Pythia6DecayerMessenger.hh"
#include "Pythia6.hh"
#include "EDecayType.hh"

#include "globals.hh"

struct Pythia6Particle;
class G4Track;
class G4DecayProducts;

/// Pythia6 decayer
///
/// Implements the G4VExtDecayer abstract class using the Pythia6 interface.
/// According to TPythia6Decayer class in Root:
/// http://root.cern.ch/
/// see http://root.cern.ch/root/License.html

class G4Pythia6Decayer : public G4VExtDecayer
{
  public:

    G4Pythia6Decayer();
    virtual ~G4Pythia6Decayer();

    virtual G4DecayProducts* ImportDecayProducts(const G4Track& track);
    
    void ForceDecayType(EDecayType decayType);
    void SetVerboseLevel(G4int verboseLevel) { fVerboseLevel =  verboseLevel; }
    
  private:

    /// Not implemented
    G4Pythia6Decayer(const G4Pythia6Decayer& right);
    /// Not implemented
    G4Pythia6Decayer& operator=(const G4Pythia6Decayer& right);
    
    G4ParticleDefinition*
    GetParticleDefinition(const Pythia6Particle* p,G4bool warn = true) const;
    G4DynamicParticle* CreateDynamicParticle(const Pythia6Particle* p) const;
    G4ThreeVector GetParticlePosition(const Pythia6Particle* particle) const;
    G4ThreeVector GetParticleMomentum(const Pythia6Particle* particle) const; 
                           
    G4int CountProducts(G4int channel, G4int particle);
    void  ForceParticleDecay(G4int particle, G4int product, G4int mult);
    void  ForceParticleDecay(G4int particle, 
                             G4int* products, G4int* mult, G4int npart);
    void  ForceHadronicD();
    void  ForceOmega();
    void  ForceDecay(EDecayType decayType);
    
    
    void  Decay(G4int pdg, const CLHEP::HepLorentzVector& p);
    G4int ImportParticles(ParticleVector* particles);
    
    static const EDecayType fgkDefaultDecayType; ///< default decay type

    G4Pythia6DecayerMessenger fMessenger;  ///< command messenger 
    G4int            fVerboseLevel;        ///< verbose level
    EDecayType       fDecayType;           ///< selected decay type
    ParticleVector*  fDecayProductsArray ; ///< array of decay products
};

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

#endif
