#ifndef __ACHAIN_HH__
#define __ACHAIN_HH__

#include "AAtom.hh"
#include "AGroup.hh"
#include "ABond.hh"
class AMolecule;

class AFigure;

class AChain
{
public:

  //--- Constractor ---
  virtual AChain *newChain(char id,short model) = 0;

  //--- Destructors ---
  virtual ~AChain() { ; }

  //--- Access to the next body ---
  virtual AChain *getNext()             = 0;
  virtual bool   setNext(AChain *chain) = 0; // Not recommended for use

  //--- Chain id identification ---
  virtual char getChainId() = 0;

  //--- Model in NMR files ---
  virtual short getModel() = 0;

  //--- Manipulation with groups ---
  virtual AGroup *getFirstGroup()               = 0;
  virtual AGroup *getLastGroup()                = 0;
  virtual bool   addGroup(AGroup *group)        = 0; // Prepends group
  virtual int    putGroupsInArray(AGroup **arr) = 0;
  virtual int    enumerateGroups()              = 0;

  //--- Manipulation with atoms ---
  virtual int getCAAtoms(AAtom** listOfCA)                   = 0;
  virtual int getMainAtoms(AAtom** listOfCA)                 = 0;
  virtual int getAllAtoms(AAtom** listOfAtoms,
			  bool withAlternative = false)      = 0;
  virtual int getNotHydroAtoms(AAtom** listOfAtoms,
			       bool withAlternative = false) = 0;

  //--- Manipulations with bonds ---
  virtual ABond *getBonds()                    = 0;
  virtual bool  addBond(ABond* bond)           = 0; // Prepends a bond
  virtual bool  areBonded(AAtom *a1,AAtom *a2) = 0;

  //--- Manipulations with back bonds ---
  virtual ABond *getBackBonds()                    = 0;
  virtual bool  addBackBond(ABond* bond)           = 0; // Prepends a bond
  virtual bool  areBackBonded(AAtom *a1,AAtom *a2) = 0;

  //--- Molecule to which the chain belongs to ---
  virtual AMolecule *getMolecule() = 0;

  //--- Counting groups and atoms ---
  virtual int countGroups() = 0;
  virtual int countAtoms()  = 0;
  virtual int countBonds()  = 0;

  //--- Selection status ---
  virtual void selectAllAtoms()   = 0;
  virtual void unselectAllAtoms() = 0;

  //--- Visibility ---
  virtual bool isVisible()     = 0;
  virtual void setVisible()    = 0;
  virtual void setNotVisible() = 0;

  //--- Manipulations with tetrahedra ---
  virtual AFigure *getTetras() = 0;

  //--- Representing alignment as the set of counter numbers of residues ---
  virtual int *setCountAli(int* arr,int n) = 0;
  virtual int *getCountAli()               = 0;
  virtual int getAliLen()                  = 0;
};

#endif