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// $Id: G4InuclSpecialFunctions.hh 67863 2013-03-11 19:00:21Z mkelsey $
//
// 20100114  M. Kelsey -- Remove G4CascadeMomentum, use G4LorentzVector directly
// 20100319  M. Kelsey -- Add optional mass argument to generateWithFixedTheta;
//		define new generateWithRandomAngles, encapsulating code; define
//		cbrt() cube-root function (in math.h, but not in <math>!)
// 20100412  M. Kelsey -- Modify paraMaker[Truncated] to take buffer as argument
// 20100914  M. Kelsey -- Migrate to integer A and Z.  Discard unused binding
//		energy functions
// 20120608  M. Kelsey -- Fix variable-name "shadowing" compiler warnings.
// 20130308  M. Kelsey -- New function to encapsulate INUCL power expansion
// 20130808  M. Kelsey -- Convert paraMaker[Truncated] to class object, to
//		allow thread isolation
// 20130829  M. Kelsey -- Address Coverity #52158, 52161 for copy actions.

#ifndef G4INUCL_SPECIAL_FUNC_HH
#define G4INUCL_SPECIAL_FUNC_HH

#include "globals.hh"
#include "G4LorentzVector.hh"
#include <algorithm>
#include <vector>

template <int N> class G4CascadeInterpolator;


namespace G4InuclSpecialFunctions {
  G4double bindingEnergy(G4int A, G4int Z);

  // NOTE:  Used only by G4Fissioner
  G4double bindingEnergyAsymptotic(G4int A, G4int Z);

  G4double FermiEnergy(G4int A, G4int Z, G4int ntype);
  
  G4double getAL(G4int A);
 
  G4double csNN(G4double e);

  G4double csPN(G4double e);

  G4double G4cbrt(G4double x);	// Can't use "cbrt" name, clashes with <math.h>

  G4double inuclRndm();				// Wrapper for G4UniformRand()

  G4double randomInuclPowers(G4double ekin, 	// Power series in Ekin, S
			     const G4double (&coeff)[4][4]);

  G4double randomGauss(G4double sigma);		// Gaussian distribution

  G4double randomPHI();

  std::pair<G4double, G4double> randomCOS_SIN();

  G4double nucleiLevelDensity(G4int A);

  // Optional mass argument will be used to fill G4LorentzVector correctly
  G4LorentzVector generateWithFixedTheta(G4double ct, G4double p,
					 G4double mass=0.);

  G4LorentzVector generateWithRandomAngles(G4double p, G4double mass=0.);

  // This is an object to be instantiated by client code
  class paraMaker {
  public:
    paraMaker(G4int verbose=0);
    ~paraMaker();

  // NOTE:  Passing Z as double here, to be used as interpolation argument
    void getParams(G4double Z, std::pair<std::vector<G4double>,
		                         std::vector<G4double> >& parms);

    void getTruncated(G4double Z, std::pair<G4double, G4double>& parms); 

  private:
    G4int verboseLevel;
    G4CascadeInterpolator<5>* interp;

    // No copy actions
    paraMaker(const paraMaker& right);
    paraMaker& operator=(const paraMaker& right);
  };
}


#endif