#ifndef PERIODENTAFEL_HPP_
#define PERIODENTAFEL_HPP_

using namespace std;

#include "defs.hpp"
#include "helpers.hpp"

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

// ====================================== class definitions =========================

class element;
class periodentafel;

/** Chemical element.
 * Class incorporates data for a certain chemical element to be referenced from atom class.
 */
class element {
  public:
    double mass;    //!< mass in g/mol
    double CovalentRadius;  //!< covalent radius
    double VanDerWaalsRadius;  //!< can-der-Waals radius
    int Z;          //!< atomic number
    char name[64];  //!< atom name, i.e. "Hydrogren"
    char symbol[3]; //!< short form of the atom, i.e. "H"
    char period[8];    //!< period: n quantum number
    char group[8];    //!< group: l quantum number
    char block[8];    //!< block: l quantum number
    element *previous;  //!< previous item in list
    element *next;  //!< next element in list
    int *sort;      //!< sorc criteria
    int No;         //!< number of element set on periodentafel::Output()
    double Valence;   //!< number of valence electrons for this element
    int NoValenceOrbitals;  //!< number of valence orbitals, used for determining bond degree in molecule::CreateConnectmatrix()
    double HBondDistance[NDIM]; //!< distance in Angstrom of this element to hydrogen  (for single, double and triple bonds)
    double HBondAngle[NDIM];     //!< typical angle for one, two, three bonded hydrogen (in degrees)

  element();
  ~element();

  //> print element entries to screen
  bool Output(ofstream *out) const;
  bool Checkout(ofstream *out, const int No, const int NoOfAtoms) const;
  
  private:
};

/** Periodentafel is a list of all elements sorted by their atomic number.
 */
class periodentafel {
  public:
    element *start; //!< start of element list
    element *end;   //!< end of element list
    char header1[MAXSTRINGSIZE]; //!< store first header line
    char header2[MAXSTRINGSIZE]; //!< store second header line
  
  periodentafel();
  ~periodentafel(); 
  
  bool AddElement(element *pointer);
  bool RemoveElement(element *pointer);
  bool CleanupPeriodtable();
  element * FindElement(int Z);
  element * FindElement(char *shorthand) const;
  element * AskElement(); 
  bool Output(ofstream *output) const;
  bool Checkout(ofstream *output, const int *checkliste) const;
  bool LoadPeriodentafel(char *path = NULL);
  bool StorePeriodentafel(char *path = NULL) const;
  
  private:
};


#endif /*PERIODENTAFEL_HPP_*/