/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2010-2012 University of Bonn. All rights reserved.
 * Please see the LICENSE file or "Copyright notice" in builder.cpp for details.
 */

/** \file Bond.cpp
 * 
 * Function implementations for the classes BondLeaf, BondTree and bond.
 * 
 */

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

#include "CodePatterns/MemDebug.hpp"

#include "CodePatterns/Log.hpp"
#include "CodePatterns/Verbose.hpp"
#include "Atom/atom.hpp"
#include "Bond/bond.hpp"
#include "Element/element.hpp"


/***************************************** Functions for class bond ********************************/

/** Empty Constructor for class bond.
 */
bond::bond() :
  leftatom(NULL),
  rightatom(NULL),
  HydrogenBond(0),
  BondDegree(0)
{};

/** Constructor for class bond, taking right and left bond partner
 * \param *left left atom
 * \param *right right atom
 * \param degree bond degree
 * \param number increasing index
 */
bond::bond(atom *left, atom *right, const int degree) :
  leftatom(left),
  rightatom(right),
  HydrogenBond(0),
  BondDegree(degree)
{
  if ((left != NULL) && (right != NULL)) {
    if ((left->getType() != NULL) && (left->getType()->getAtomicNumber() == 1))
      HydrogenBond++;
    if ((right->getType() != NULL) && (right->getType()->getAtomicNumber() == 1))
      HydrogenBond++;
  }
};

/** Empty Destructor for class bond.
 */
bond::~bond()
{
  // first signal destruction of this bond
  {
    OBSERVE;
    NOTIFY(BondRemoved);
  }
  // remove this node from the list structure
  if (leftatom != NULL)
    leftatom->removeBond(this);
  // there might be self-bonds
  if ((leftatom != rightatom) && (rightatom != NULL))
    rightatom->removeBond(this);
};

ostream & operator << (ostream &ost, const bond &b)
{
  ost << "[" << b.leftatom->getName() << " <" << b.BondDegree << "(H" << b.HydrogenBond << ")>" << b.rightatom->getName() << "]";
  return ost;
};

/** Get the other atom in a bond if one is specified.
 * \param *Atom the pointer to the one atom
 * \return pointer to the other atom in the bond, NULL if no match (indicates something's wrong with the bond) 
 */
atom * bond::GetOtherAtom(const ParticleInfo * const Atom) const
{
  if(leftatom == Atom) 
    return rightatom;
  if(rightatom == Atom) 
    return leftatom;
  ELOG(1, "Bond " << *this << " does not contain atom " << *Atom << "!");
  return NULL;
};


/** Checks if an atom exists in a bond.
 * \param *ptr pointer to atom
 * \return true if it is either bond::leftatom or bond::rightatom, false otherwise
 */
bool bond::Contains(const ParticleInfo * const ptr) const
{
  return ((leftatom == ptr) || (rightatom == ptr));
};

/** Checks if an atom exists in a bond.
 * \param Nr index of atom
 * \return true if it is either bond::leftatom or bond::rightatom, false otherwise
 */
bool bond::Contains(const int number) const
{
  return ((leftatom->getNr() == number) || (rightatom->getNr() == number));
};

/** Calculates the bond length.
 * \return |a - b| with a = bond::leftatom and b = bond::rightatom.
 */
double bond::GetDistance() const
{
  return (leftatom->distance(*rightatom));
};

/** Calculates the bond length.
 * \return |a - b|^2 with a = bond::leftatom and b = bond::rightatom.
 */
double bond::GetDistanceSquared() const
{
  return (leftatom->DistanceSquared(*rightatom));
};