//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// -------------------------------------------------------------------
//      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
//      
// -------------------------------------------------------------------
//
// 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 = static_cast<G4int>(nucleus.GetZ());
  G4int A = static_cast<G4int>(nucleus.GetA());
  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() const
{
 G4bool canDo = true;

  if (_transition == 0) 
    {
      canDo = false;

      if (_verbose > 0)
	G4cout 
	  << "G4ContinuumGammaDeexcitation::CanDoTransition - Null transition "
	  << G4endl;
    }

  G4Fragment nucleus = GetNucleus();
  G4double excitation = nucleus.GetExcitationEnergy();

  G4double A = nucleus.GetA();
  G4double Z = nucleus.GetZ();
  if (A <2 || Z<3)
    {
      canDo = false;
      if (_verbose > 0) 
	G4cout 
	  << "G4ContinuumGammaDeexcitation::CanDoTransition - n/p/H"
	  << G4endl;
    }



  if (excitation <= 0.) 
    {
      canDo = false;
      if (_verbose > 0) 
	G4cout 
	  << "G4ContinuumGammaDeexcitation::CanDoTransition -  Excitation <= 0"
	  << G4endl;
    }
  G4double tolerance = 10*eV;
  if (excitation <= (_levelManager->MaxLevelEnergy()+ tolerance)) 
    {
      canDo = false;  
      if (_verbose > 0)
      G4cout << "G4ContinuumGammaDeexcitation::CanDoTransition -  Excitation " 
	     << excitation << " below max discrete level " 
	     << _levelManager->MaxLevelEnergy() << G4endl;
    }
  
  if (canDo)
    { if (_verbose > 1) 
      G4cout <<"G4ContinuumGammaDeexcitation::CanDoTransition - CanDo" 
	     << G4endl; 
    }

  return canDo;

}