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// GEANT4 tag $Name: not supported by cvs2svn $
//
// GEANT4 physics class: G4PhotoNuclearCrossSection -- header file
// Created: M.V. Kossov, CERN/ITEP(Moscow), 10-OCT-01
// The last update: M.V. Kossov, CERN/ITEP (Moscow) 17-May-02

#ifndef G4PhotoNuclearCrossSection_h
#define G4PhotoNuclearCrossSection_h 1

#include "G4VCrossSectionDataSet.hh"
#include "G4DynamicParticle.hh"
#include "G4Element.hh"
#include "G4ParticleTable.hh"
#include "G4NucleiProperties.hh"
#include <vector>

class G4PhotoNuclearCrossSection : public G4VCrossSectionDataSet
{
  public:

    G4PhotoNuclearCrossSection(const G4String& name = "PhotoNuclearXS");
    virtual ~G4PhotoNuclearCrossSection();

    virtual void CrossSectionDescription(std::ostream&) const;

    virtual G4bool
    IsIsoApplicable(const G4DynamicParticle* particle, G4int /*Z*/, G4int /*A*/,
                    const G4Element*, const G4Material*);

    virtual G4double
    GetIsoCrossSection(const G4DynamicParticle*, G4int /*Z*/, G4int /*A*/,
                       const G4Isotope*, const G4Element*, const G4Material*);

  private:

    G4int GetFunctions(G4double a, G4double* y, G4double* z);
    G4double EquLinearFit(G4double X, G4int N, const G4double X0,
                          const G4double XD, const G4double* Y);
    G4double ThresholdEnergy(G4int Z, G4int N);

  // Body
  private:

    static G4int     lastN;   // The last N of calculated nucleus
    static G4int     lastZ;   // The last Z of calculated nucleus
    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  lastTH;  // Last value of the Energy Threshold (A-dependent)
    static G4double  lastSP;  // Last value of the ShadowingPomeron (A-dependent)

    // Vector of pointers to the GDRPhotonuclearCrossSection
    static std::vector <G4double*> GDR;

    // Vector of pointers to the HighEnPhotonuclearCrossSect
    static std::vector <G4double*> HEN;
};

#endif