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// $Id$
//
//      ---------------- G4QLowEnergy header ----------------
//                 by Mikhail Kossov, Aug 2007.
//  Header of G4QLowEnergy class (A+A) of the CHIPS Simulation Branch in GEANT4
// -------------------------------------------------------------------------------
// This is a unique CHIPS class for the Ion-Ion Low Energy Inelastic Interactions
// -------------------------------------------------------------------------------
// At present (Aug-07) it is not tested.
// The normalization is based on the temporary G4QIonIonCrossSection class
// -------------------------------------------------------------------------------
// Short description: This is a fast low energy algorithm for the
// inelastic interactions of nucleons and nuclei (ions) with nuclei.
// This is a fase-space algorithm, but not quark level. Provides
// nuclear fragments upto alpha only. Never was tumed (but can be).
// ---------------------------------------------------------------

#ifndef G4QLowEnergy_hh
#define G4QLowEnergy_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 "G4ParticleTable.hh"
#include "G4VParticleChange.hh"
#include "G4ParticleDefinition.hh"
#include "G4DynamicParticle.hh"
#include "G4ThreeVector.hh"
#include "G4LorentzVector.hh"

// CHIPS Headers
#include "G4QNucleus.hh"
#include "G4QIonIonCrossSection.hh"
#include "G4QProtonNuclearCrossSection.hh"
#include "G4QProtonElasticCrossSection.hh"
#include "G4QNeutronElasticCrossSection.hh"
#include "G4QIsotope.hh"
#include "G4QCHIPSWorld.hh"
#include "G4QHadronVector.hh"
#include <vector>

class G4QLowEnergy : public G4VDiscreteProcess
{
public:

  // Constructor
  G4QLowEnergy(const G4String& processName ="CHIPS_LowEnergyIonIonInelastic");

  // Destructor
  ~G4QLowEnergy();

  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();

  void SwitchOnEvaporation() {evaporate=true;}   // Evaporation instead of gammas (default)

  void SwitchOffEvaporation() {evaporate=false;} // Gammas instead of evaporation

private:

  // Hide assignment operator as private 
  G4QLowEnergy& operator=(const G4QLowEnergy &right);

  // Copy constructor
  G4QLowEnergy(const G4QLowEnergy&);

  // Calculate Cross-Section of the Diffraction Reaction (p is in GeV @@ units)
  G4double CalculateXS(G4double p, G4int Z, G4int N, G4int pPDG);

  // BODY
  // Static Parameters --------------------------------------------------------------------
  static G4int    nPartCWorld; // The#of particles for hadronization (limit of A of fragm.)
  //--------------------------------- End of static parameters ---------------------------
  // Working parameters
  G4bool evaporate;
  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
  static std::vector <G4int> ElementZ;                // Z of the element(i) in theLastCalc
  static std::vector <G4double> ElProbInMat;          // SumProbabilityElements in Material
  static std::vector <std::vector<G4int>*> ElIsoN;    // N of isotope(j) of Element(i)
  static std::vector <std::vector<G4double>*> IsoProbInEl;// SumProbabIsotopes in Element i
};
#endif