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// $Id: G4NuclearLevelStore.cc,v 1.5 2010/11/17 16:50:53 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//
// 06-10-2010 M. Kelsey -- Drop static data members.
// 17-11-2010 V. Ivanchenko - make as a classical singleton. 

#include "G4NuclearLevelStore.hh"
#include <sstream>

G4NuclearLevelStore* G4NuclearLevelStore::theInstance = 0;

G4NuclearLevelStore* G4NuclearLevelStore::GetInstance()
{
  if(!theInstance) {
    static G4NuclearLevelStore store;
    theInstance = &store;
  }
  return theInstance;
}

G4NuclearLevelStore::G4NuclearLevelStore()
{
  char* env = getenv("G4LEVELGAMMADATA");
  if (env == 0) 
    {
      G4cout << "G4NuclarLevelStore: please set the G4LEVELGAMMADATA environment variable\n";
      dirName = "";
    }
  else
    {
      dirName = env;
      dirName += '/';
    }
}

G4NuclearLevelStore::~G4NuclearLevelStore()
{
  ManagersMap::iterator i;
  for (i = theManagers.begin(); i != theManagers.end(); ++i)
    delete i->second;
}

G4String 
G4NuclearLevelStore::GenerateFilename(G4int Z, G4int A) const 
{
  std::ostringstream streamName; 
  streamName << 'z' << Z << ".a" << A;
  G4String name(streamName.str());
  return name;
}

G4NuclearLevelManager* 
G4NuclearLevelStore::GetManager(G4int Z, G4int A) 
{
  G4NuclearLevelManager * result = 0; 
  if (A < 1 || Z < 1 || A < Z)
    {
	G4cerr << "G4NuclearLevelStore::GetManager: Wrong values Z = " << Z 
	       << " A = " << A << '\n';
	return result;
    }

  // Generate the key = filename
  G4int key = GenerateKey(Z,A);
    
  // Check if already exists that key
  ManagersMap::iterator idx = theManagers.find(key);
  // If doesn't exists then create it
  if ( idx == theManagers.end() )
    {
      G4String file = GenerateFilename(Z,A);
      result = new G4NuclearLevelManager(Z,A,dirName + file);
      theManagers.insert(std::make_pair(key,result));
    }
  // But if it exists...
  else
    {
      result = idx->second;
    }
    
  return result; 
}
