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// $Id$
//
//      ---------------- G4QAtomicElectronScattering header ----------------
//                 by Mikhail Kossov, December 2003.
// Header of G4QAtomicElectronScattering class of the CHIPS Simulation Branch in GEANT4
// -------------------------------------------------------------------------------
// This is a unique CHIPS class for the Nuclear Interactions with Atomic electrons.
// -------------------------------------------------------------------------------
// ****************************************************************************************
// ********* This HEADER is temporary moved from the photolepton_hadron directory *********
// ******* DO NOT MAKE ANY CHANGE! With time it'll move back to photolepton...(M.K.) ******
// ****************************************************************************************
// Short description: CHIPS is re3sponsible for photo- and lepto-nuclear
// reactions. In particular for thr electron-nuclear reactions. At High
// Energies the nucleons (including neutrons) and nuclear fragments can
// interact with atomic electrons (reversed electro-nuclear reaction -
// antilab), while they are missing the nucler-nuclear (ion-ion) reac-
// tions. This nucleo-electron process comes "for-free" in CHIPS, as the
// cross-sections of the interaction is known from the electro-nuclear
// reactions. The only problem is to move the output from the antilab to
// lab system. This is what this process is aiming to do. It can be used
// for the ion transport in Geant4.
// ---------------------------------------------------------------------

#ifndef G4QAtomicElectronScattering_hh
#define G4QAtomicElectronScattering_hh

// GEANT4 Headers
#include "globals.hh"
#include "G4ios.hh"
#include "Randomize.hh" 
#include "G4VDiscreteProcess.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4ParticleTypes.hh"
#include "G4VParticleChange.hh"
#include "G4ParticleDefinition.hh"
#include "G4DynamicParticle.hh"
#include "G4ThreeVector.hh"
#include "G4LorentzVector.hh"

// CHIPS Headers
#include "G4QEnvironment.hh"
#include "G4VQCrossSection.hh"
#include "G4QIsotope.hh"
#include "G4QElectronNuclearCrossSection.hh"
#include "G4QPhotonNuclearCrossSection.hh"
#include "G4QMuonNuclearCrossSection.hh"
#include "G4QTauNuclearCrossSection.hh"
#include "G4QPDGToG4Particle.hh"

class G4QAtomicElectronScattering : public G4VDiscreteProcess
{
public:

  // Constructor
  G4QAtomicElectronScattering(const G4String& processName ="CHIPSNuclearCollision");

  // Destructor
  ~G4QAtomicElectronScattering();

  G4bool IsApplicable(const G4ParticleDefinition& particle);

  G4double GetMeanFreePath(const G4Track& aTrack, G4double previousStepSize,
                           G4ForceCondition* condition);
  // It returns the MeanFreePath of the process for the current track :
  // (energy, material)
  // The previousStepSize and G4ForceCondition* are not used.
  // This function overloads a virtual function of the base class.        
  // It is invoked by the ProcessManager of the Particle.
 

  G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep); 
  // It computes the final state of the process (at end of step),
  // returned as a ParticleChange object.       
  // This function overloads a virtual function of the base class.
  // It is invoked by the ProcessManager of the Particle.


  G4LorentzVector GetEnegryMomentumConservation();

  G4int GetNumberOfNeutronsInTarget();

  // Static functions
  static void SetManual();
  static void SetStandard();
  static void SetParameters(G4double temper=180., G4double ssin2g=.1, G4double etaetap=.3,
                            G4double fN=0., G4double fD=0., G4double cP=1., G4double mR=1.,
                            G4int npCHIPSWorld=234, G4double solAn=.5, G4bool efFlag=false,
                            G4double piTh=141.4,G4double mpi2=20000.,G4double dinum=1880.);

private:

  // Hide assignment operator as private 
  G4QAtomicElectronScattering& operator=(const G4QAtomicElectronScattering &right);

  // Copy constructor
  G4QAtomicElectronScattering(const G4QAtomicElectronScattering&);

  // BODY
  // Static Parameters
  static G4bool   manualFlag;  // If false then standard parameters are used
  static G4int    nPartCWorld; // The#of particles for hadronization (limit of A of fragm.)
  // -> Parameters of the G4Quasmon class:
  static G4double Temperature; // Quasmon Temperature
  static G4double SSin2Gluons; // Percent of ssbar sea in a constituen gluon
  static G4double EtaEtaprime; // Part of eta-prime in all etas
  // -> Parameters of the G4QNucleus class:
  static G4double freeNuc;     // probability of the quasi-free baryon on surface
  static G4double freeDib;     // probability of the quasi-free dibaryon on surface
  static G4double clustProb;   // clusterization probability in dense region
  static G4double mediRatio;   // relative vacuum hadronization probability
  // -> Parameters of the G4QEnvironment class:
  static G4bool   EnergyFlux;  // Flag for Energy Flux use instead of Multy Quasmon
  static G4double SolidAngle;  // Part of Solid Angle to capture secondaries(@@A-dep)
  static G4double PiPrThresh;  // Pion Production Threshold for gammas
  static G4double M2ShiftVir;  // Shift for M2=-Q2=m_pi^2 of the virtual gamma
  static G4double DiNuclMass;  // Double Nucleon Mass for virtual normalization
  //
  // Working parameters
  G4VQCrossSection* theCS;
  G4LorentzVector EnMomConservation;                  // Residual of Energy/Momentum Cons.
  G4int nOfNeutrons;                                  // #of neutrons in the target nucleus

  // Modifires for the reaction
  G4double Time;                                      // Time shift of the capture reaction
  G4double EnergyDeposition;                          // Energy deposited in the reaction
};
#endif