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//
// $Id: G4ContinuumGammaDeexcitation.cc,v 1.8 2010/11/17 19:17:17 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//
// -------------------------------------------------------------------
//      GEANT 4 class file 
//
//      CERN, Geneva, Switzerland
//
//      File name:     G4ContinuumGammaDeexcitation
//
//      Authors:       Carlo Dallapiccola (dallapiccola@umdhep.umd.edu)
//                     Maria Grazia Pia (pia@genova.infn.it)
// 
//      Creation date: 23 October 1998
//
//      Modifications: 
//
//      02 May 2003,   Vladimir Ivanchenko change interface to G4NuclearlevelManager
//
//      19 April 2010 J. M. Quesada: smaller value of tolerance parameter
//      
// -------------------------------------------------------------------
//
// Class G4ContinuumGammaDeexcitation.cc
//
//       Concrete class derived from G4VGammaDeexcitation
//
//
#include "G4ContinuumGammaDeexcitation.hh"

#include "G4Gamma.hh"
#include "G4ContinuumGammaTransition.hh"
#include "G4NuclearLevelManager.hh"
#include "G4NuclearLevelStore.hh"
#include "G4Fragment.hh"      
#include "G4ConstantLevelDensityParameter.hh"

//
// Constructor
//

G4ContinuumGammaDeexcitation::G4ContinuumGammaDeexcitation()
  : _nucleusZ(0), _nucleusA(0), _levelManager(0)
{}

G4ContinuumGammaDeexcitation::~G4ContinuumGammaDeexcitation() 
{}

G4VGammaTransition* G4ContinuumGammaDeexcitation::CreateTransition()
{
  G4Fragment* nucleus = GetNucleus();
  G4int Z = nucleus->GetZ_asInt();
  G4int A = nucleus->GetA_asInt();
  G4double excitation = nucleus->GetExcitationEnergy();

  if (_nucleusA != A || _nucleusZ != Z)
    {
      _levelManager = G4NuclearLevelStore::GetInstance()->GetManager(Z,A);
      _nucleusA = A;
      _nucleusZ = Z;
    }

  if (_verbose > 1) {
    G4cout << "G4ContinuumGammaDeexcitation::CreateTransition - Created" << G4endl;
  }
  G4VGammaTransition* gt =  
    new G4ContinuumGammaTransition(_levelManager,Z,A,excitation,_verbose );

  return gt;
}
    

G4bool G4ContinuumGammaDeexcitation::CanDoTransition() 
{
  //JMQ: far too small, creating sometimes continuum gammas instead 
  //     of the right discrete ones (when excitation energy is slightly 
  //     over maximum discrete  energy): changed
  //  G4double tolerance = 10*eV;
  const G4double tolerance = CLHEP::keV;

  if (_transition == 0) 
    {
      if (_verbose > 0) {
	G4cout << "G4ContinuumGammaDeexcitation::CanDoTransition - Null transition "
	       << G4endl;
      }
      return false;
    }

  G4Fragment* nucleus = GetNucleus();
  G4double excitation = nucleus->GetExcitationEnergy();

  if (_nucleusZ < 2 || _nucleusA < 3)
    {
      if (_verbose > 1) { 
	G4cout << "G4ContinuumGammaDeexcitation::CanDoTransition - n/p/H"
	       << G4endl;
      }
      return false;
    }

  if (excitation <= tolerance) 
    {
      if (_verbose > 1) { 
	G4cout << "G4ContinuumGammaDeexcitation::CanDoTransition -  Excitation "
	       << excitation/CLHEP::keV << " keV is too small"
	       << G4endl;
      }
      return false;
    }
  if (excitation <= (_levelManager->MaxLevelEnergy() + tolerance)) 
    {  
      if (_verbose > 0) {
	G4cout << "G4ContinuumGammaDeexcitation::CanDoTransition -  Excitation " 
	       << excitation << " below max discrete level " 
	       << _levelManager->MaxLevelEnergy() << G4endl;
      }
      return false;
    }
  
  if (_verbose > 1) {
    G4cout <<"G4ContinuumGammaDeexcitation::CanDoTransition - CanDo" 
	   << " Eex(keV)= " << excitation/CLHEP::keV 
	   << " Emax(keV)= " << _levelManager->MaxLevelEnergy()/CLHEP::keV 
	   << " Z= " << _nucleusZ << " A= " << _nucleusA
	   << G4endl;
  }
  return true;
}