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// GEANT4 tag $Name: geant4-09-03 $
//
//
// GEANT4 physics class: G4QPhotonNuclearCrossSection -- header file
// Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-01
// The last update: M.V. Kossov, CERN/ITEP (Moscow) 17-May-02
//
// ****************************************************************************************
// ********* 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: This is an original CHIPS process for photo-nuclear
// interactions, which does not include "fast and dirty" corrections for
// reactions near threshold, with respect to the GHAD application of CHIPS.
// ------------------------------------------------------------------------

#ifndef G4QPhotonNuclearCrossSection_h
#define G4QPhotonNuclearCrossSection_h 1

#include "G4ParticleTable.hh"
#include "G4NucleiProperties.hh"
#include <vector>
#include "G4VQCrossSection.hh"

class G4QPhotonNuclearCrossSection : public G4VQCrossSection
{
protected:

  G4QPhotonNuclearCrossSection()  {}

public:

  ~G4QPhotonNuclearCrossSection();

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

  // 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);

  G4double ThresholdEnergy(G4int Z, G4int N, G4int PDG=22);

private:
  G4int    GetFunctions(G4double A, G4double* y, G4double* z);// y&z are pointers to arrays

// Body
private:
  static G4bool    onlyCS;  // flag to calculate only CrossSection
  static G4double  lastSig; // Last value of the Cross Section
  static G4double* lastGDR; // Pointer to the last array of GDR cross sections
  static G4double* lastHEN; // Pointer to the last array of HEn cross sections
  static G4double  lastE;   // Last used in the cross section Energy
  static G4double  lastSP;  // Last value of the ShadowingPomeron (A-dependent)
  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*>* GDR; // Vector of pointers to GDRPhotonuclearCrossSection
  static std::vector <G4double*>* HEN; // Vector of pointers to HighEnPhotonuclearCrossSect
};

#endif