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// $Id$
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//
// GEANT4 physics class: G4QANuMuNuclearCrossSection -- header file for (anu_mu,mu+)A XS
// M.V. Kossov, CERN-ITEP(Moscow), 20-DEC-2005
// The last update: M.V. Kossov, CERN/ITEP (Moscow) 20-DEC-2005
//
// Short description: this G4 singletone class calculates (nu_mu,mu) Nuclear cross section
// (Energy limit: E<320GeV->badExtrapolation) for a particular isotope (proportional to A)
// ****************************************************************************************

#ifndef G4QANuMuNuclearCrossSection_h
#define G4QANuMuNuclearCrossSection_h 1

#include "G4ParticleTable.hh"
#include "G4NucleiProperties.hh"
#include <vector>
#include "Randomize.hh"
#include "G4MuonPlus.hh"
#include "G4MuonMinus.hh"
#include "G4VQCrossSection.hh"

class G4QANuMuNuclearCrossSection : public G4VQCrossSection
{
protected:

  G4QANuMuNuclearCrossSection()  {};

public:

  ~G4QANuMuNuclearCrossSection();

  static G4VQCrossSection* GetPointer(); // Gives a pointer to this singletone

  G4double ThresholdEnergy(G4int Z, G4int N, G4int PDG=-14);

  // At present momentum (pMom) must be in GeV (@@ Units)
  virtual G4double GetCrossSection(G4bool fCS, G4double pMom, G4int tgZ, G4int tgN,
                                                                             G4int pPDG=0);

  G4double CalculateCrossSection(G4bool CS, G4int F, G4int I, G4int PDG, G4int Z,
                                                               G4int N, G4double Momentum);
  G4int    GetExchangePDGCode();

  G4double GetDirectPart(G4double Q2);

  G4double GetNPartons(G4double Q2);

  G4double GetQEL_ExchangeQ2();

  G4double GetNQE_ExchangeQ2();

  // Get static members
  G4double GetLastTOTCS() {return lastSig;}
  G4double GetLastQELCS() {return lastQEL;}

private:
  G4int    GetFunctions(G4int z, G4int n, G4double* t, G4double* q, G4double* e);
  G4double HighEnergyTX(G4double lE);
  G4double HighEnergyQE(G4double lE);

// Body
private:
  static G4bool    onlyCS;   // flag to calculate only CS (not QE)
  static G4double  lastSig;  // Last calculated total cross section
  static G4double  lastQEL;  // Last calculated quasi-elastic cross section
  static G4int     lastL;    // Last bin used in the cross section TheLastBin
  static G4double  lastE;    // Last energy used in the cross section Energy
  static G4double* lastEN;   // Pointer to the last array of the energy axis
  static G4double* lastTX;   // Pointer to the last array of the total CS function
  static G4double* lastQE;   // Pointer to the last array of the QE CS function
  static G4int     lastPDG;  // The last projectile PDG
  static G4int     lastN;    // The last N of calculated nucleus
  static G4int     lastZ;    // The last Z of calculated nucleus
  static G4double  lastP;    // Last used in the cross section Momentum
  static G4double  lastTH;   // Last value of the Momentum Threshold
  static G4double  lastCS;   // Last value of the Cross Section
  static G4int     lastI;    // The last position in the DAMDB
  static std::vector <G4double*>* TX; // Vector of pointers to the TX tabulated functions
  static std::vector <G4double*>* QE; // Vector of pointers to the QE tabulated functions
};

#endif