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//
// G4tgrFileIn
//
// Class description:
//
// Singleton for importing file descriptions.

// Author: P.Arce, CIEMAT (November 2007)
// --------------------------------------------------------------------
#ifndef G4tgrFileIn_hh
#define G4tgrFileIn_hh 1

#include <vector>

#include "globals.hh"

class G4tgrFileIn
{
  public:

    G4tgrFileIn();
    ~G4tgrFileIn();

    static G4tgrFileIn& GetInstance(const G4String& name);
      // Get the only instance opening the file

    static G4tgrFileIn& GetInstanceOpened(const G4String& name);
      // Get the only instance when file should be already opened

    G4int GetWordsInLine(std::vector<G4String>& wl);
      // Read a line and transform it to a vector of words

    void ErrorInLine();
      // Print out an error message indicating the line being read

    // Access data members

    G4int Nline() { return theLineNo[theCurrentFile]; }

    const G4String& GetName() { return theName; }

    void OpenNewFile(const char* filename);
    G4bool EndOfFile();
    void Close();
    void DumpException(const G4String& sent);

  private:

    G4tgrFileIn(const G4String& name) : theName(name) {}

  private:

    std::vector<std::ifstream*> theFiles;

    std::vector<G4int> theLineNo;
      // Number of line being read

    std::vector<G4String> theNames;

    G4int theCurrentFile = -1;
      // Index of file being read in theFiles

    static G4ThreadLocal std::vector<G4tgrFileIn*>* theInstances;
      // Vector of class instances (each one identified by its name)

    G4String theName = "";
      // Name of file
};

#endif