//
//  Copyright (C) 2001-2024 Greg Landrum and other RDKit contributors
//
//   @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//
#include "Bond.h"
#include "Atom.h"
#include "ROMol.h"
#include <RDGeneral/Invariant.h>
#include "Atropisomers.h"

namespace RDKit {

Bond::Bond() : RDProps() { initBond(); };

Bond::Bond(BondType bT) : RDProps() {
  initBond();
  d_bondType = bT;
};

Bond::Bond(const Bond &other) : RDProps(other) {
  // NOTE: we do *not* copy ownership!
  dp_mol = nullptr;
  d_bondType = other.d_bondType;
  d_beginAtomIdx = other.d_beginAtomIdx;
  d_endAtomIdx = other.d_endAtomIdx;
  d_dirTag = other.d_dirTag;
  d_stereo = other.d_stereo;
  if (other.dp_stereoAtoms) {
    dp_stereoAtoms = new INT_VECT(*other.dp_stereoAtoms);
  } else {
    dp_stereoAtoms = nullptr;
  }
  df_isAromatic = other.df_isAromatic;
  df_isConjugated = other.df_isConjugated;
  d_index = other.d_index;
  d_flags = other.d_flags;
}

Bond::~Bond() { delete dp_stereoAtoms; }

Bond &Bond::operator=(const Bond &other) {
  if (this == &other) {
    return *this;
  }
  dp_mol = other.dp_mol;
  d_bondType = other.d_bondType;
  d_beginAtomIdx = other.d_beginAtomIdx;
  d_endAtomIdx = other.d_endAtomIdx;
  d_dirTag = other.d_dirTag;
  delete dp_stereoAtoms;
  if (other.dp_stereoAtoms) {
    dp_stereoAtoms = new INT_VECT(*other.dp_stereoAtoms);
  } else {
    dp_stereoAtoms = nullptr;
  }
  df_isAromatic = other.df_isAromatic;
  df_isConjugated = other.df_isConjugated;
  d_index = other.d_index;
  d_props = other.d_props;
  d_flags = other.d_flags;

  return *this;
}

Bond *Bond::copy() const {
  auto *res = new Bond(*this);
  return res;
}

void Bond::setOwningMol(ROMol *other) {
  // FIX: doesn't update topology
  dp_mol = other;
}

unsigned int Bond::getOtherAtomIdx(const unsigned int thisIdx) const {
  if (d_beginAtomIdx == thisIdx) {
    return d_endAtomIdx;
  } else if (d_endAtomIdx == thisIdx) {
    return d_beginAtomIdx;
  }
  // This "precondition" would check exactly the same that is checked
  // above, but no need to be redundant, so just throw.
  POSTCONDITION(false, "bad index");
}

void Bond::setBeginAtomIdx(unsigned int what) {
  if (dp_mol) {
    URANGE_CHECK(what, getOwningMol().getNumAtoms());
  }
  d_beginAtomIdx = what;
};

void Bond::setEndAtomIdx(unsigned int what) {
  if (dp_mol) {
    URANGE_CHECK(what, getOwningMol().getNumAtoms());
  }
  d_endAtomIdx = what;
};

void Bond::setBeginAtom(Atom *at) {
  PRECONDITION(dp_mol != nullptr, "no owning molecule for bond");
  setBeginAtomIdx(at->getIdx());
}
void Bond::setEndAtom(Atom *at) {
  PRECONDITION(dp_mol != nullptr, "no owning molecule for bond");
  setEndAtomIdx(at->getIdx());
}

Atom *Bond::getBeginAtom() const {
  PRECONDITION(dp_mol != nullptr, "no owning molecule for bond");
  return dp_mol->getAtomWithIdx(d_beginAtomIdx);
};
Atom *Bond::getEndAtom() const {
  PRECONDITION(dp_mol != nullptr, "no owning molecule for bond");
  return dp_mol->getAtomWithIdx(d_endAtomIdx);
};
Atom *Bond::getOtherAtom(Atom const *what) const {
  PRECONDITION(dp_mol != nullptr, "no owning molecule for bond");

  return dp_mol->getAtomWithIdx(getOtherAtomIdx(what->getIdx()));
};

double Bond::getBondTypeAsDouble() const {
  double res;
  switch (getBondType()) {
    case UNSPECIFIED:
    case IONIC:
    case ZERO:
      res = 0;
      break;
    case SINGLE:
      res = 1;
      break;
    case DOUBLE:
      res = 2;
      break;
    case TRIPLE:
      res = 3;
      break;
    case QUADRUPLE:
      res = 4;
      break;
    case QUINTUPLE:
      res = 5;
      break;
    case HEXTUPLE:
      res = 6;
      break;
    case ONEANDAHALF:
      res = 1.5;
      break;
    case TWOANDAHALF:
      res = 2.5;
      break;
    case THREEANDAHALF:
      res = 3.5;
      break;
    case FOURANDAHALF:
      res = 4.5;
      break;
    case FIVEANDAHALF:
      res = 5.5;
      break;
    case AROMATIC:
      res = 1.5;
      break;
    case DATIVEONE:
      res = 1.0;
      break;  // FIX: this should probably be different
    case DATIVE:
      res = 1.0;
      break;  // FIX: again probably wrong
    case HYDROGEN:
      res = 0.0;
      break;
    default:
      UNDER_CONSTRUCTION("Bad bond type");
  }
  return res;
}

double Bond::getValenceContrib(const Atom *atom) const {
  if (atom != getBeginAtom() && atom != getEndAtom()) {
    return 0.0;
  }
  double res;
  if ((getBondType() == DATIVE || getBondType() == DATIVEONE) &&
      atom->getIdx() != getEndAtomIdx()) {
    res = 0.0;
  } else if (getBondType() == HYDROGEN) {
    res = 0.0;
  } else {
    res = getBondTypeAsDouble();
  }

  return res;
}

void Bond::setQuery(QUERYBOND_QUERY *) {
  //  Bonds don't have queries at the moment because I have not
  //  yet figured out what a good base query should be.
  //  It would be nice to be able to do substructure searches
  //  using molecules alone, so it'd be nice if we got this
  //  issue resolved ASAP.
  PRECONDITION(0, "plain bonds have no Query");
}

Bond::QUERYBOND_QUERY *Bond::getQuery() const {
  PRECONDITION(0, "plain bonds have no Query");
  return nullptr;
};

bool Bond::Match(Bond const *what) const {
  bool res;
  if (getBondType() == Bond::UNSPECIFIED ||
      what->getBondType() == Bond::UNSPECIFIED) {
    res = true;
  } else {
    res = getBondType() == what->getBondType();
  }
  return res;
};

void Bond::expandQuery(Bond::QUERYBOND_QUERY *, Queries::CompositeQueryType,
                       bool) {
  PRECONDITION(0, "plain bonds have no query");
};

void Bond::initBond() {
  d_bondType = UNSPECIFIED;
  d_dirTag = NONE;
  d_stereo = STEREONONE;
  dp_mol = nullptr;
  d_beginAtomIdx = 0;
  d_endAtomIdx = 0;
  df_isAromatic = 0;
  d_index = 0;
  df_isConjugated = 0;
  dp_stereoAtoms = nullptr;
};

void Bond::setStereoAtoms(unsigned int bgnIdx, unsigned int endIdx) {
  PRECONDITION(
      getOwningMol().getBondBetweenAtoms(getBeginAtomIdx(), bgnIdx) != nullptr,
      "bgnIdx not connected to begin atom of bond");
  PRECONDITION(
      getOwningMol().getBondBetweenAtoms(getEndAtomIdx(), endIdx) != nullptr,
      "endIdx not connected to end atom of bond");

  auto &atoms = getStereoAtoms();
  atoms.clear();
  atoms.push_back(bgnIdx);
  atoms.push_back(endIdx);
};

uint8_t getTwiceBondType(const Bond &b) {
  switch (b.getBondType()) {
    case Bond::UNSPECIFIED:
    case Bond::IONIC:
    case Bond::ZERO:
      return 0;
      break;
    case Bond::SINGLE:
      return 2;
      break;
    case Bond::DOUBLE:
      return 4;
      break;
    case Bond::TRIPLE:
      return 6;
      break;
    case Bond::QUADRUPLE:
      return 8;
      break;
    case Bond::QUINTUPLE:
      return 10;
      break;
    case Bond::HEXTUPLE:
      return 12;
      break;
    case Bond::ONEANDAHALF:
      return 3;
      break;
    case Bond::TWOANDAHALF:
      return 5;
      break;
    case Bond::THREEANDAHALF:
      return 7;
      break;
    case Bond::FOURANDAHALF:
      return 9;
      break;
    case Bond::FIVEANDAHALF:
      return 11;
      break;
    case Bond::AROMATIC:
      return 3;
      break;
    case Bond::DATIVEONE:
      return 2;
      break;  // FIX: this should probably be different
    case Bond::DATIVE:
      return 2;
      break;  // FIX: again probably wrong
    case Bond::HYDROGEN:
      return 0;
      break;
    default:
      UNDER_CONSTRUCTION("Bad bond type");
  }
}

bool Bond::invertChirality() {
  switch (getStereo()) {
    case STEREOATROPCW:
      setStereo(STEREOATROPCCW);
      return true;
    case STEREOATROPCCW:
      setStereo(STEREOATROPCW);
      return true;

    default:
      break;
  }
  return false;
}

};  // namespace RDKit

namespace {
constexpr const char *bondTypeToString(RDKit::Bond::BondType d) {
  switch (d) {
    case RDKit::Bond::BondType::UNSPECIFIED:
      return "?";
    case RDKit::Bond::BondType::SINGLE:
      return "1";
    case RDKit::Bond::BondType::DOUBLE:
      return "2";
    case RDKit::Bond::BondType::TRIPLE:
      return "3";
    case RDKit::Bond::BondType::QUADRUPLE:
      return "4";
    case RDKit::Bond::BondType::QUINTUPLE:
      return "5";
    case RDKit::Bond::BondType::HEXTUPLE:
      return "6";
    case RDKit::Bond::BondType::ONEANDAHALF:
      return "1.5";
    case RDKit::Bond::BondType::TWOANDAHALF:
      return "2.5";
    case RDKit::Bond::BondType::THREEANDAHALF:
      return "3.5";
    case RDKit::Bond::BondType::FOURANDAHALF:
      return "4.5";
    case RDKit::Bond::BondType::FIVEANDAHALF:
      return "5.5";
    case RDKit::Bond::BondType::AROMATIC:
      return "a";
    case RDKit::Bond::BondType::IONIC:
      return "I";
    case RDKit::Bond::BondType::HYDROGEN:
      return "H";
    case RDKit::Bond::BondType::THREECENTER:
      return "3C";
    case RDKit::Bond::BondType::DATIVEONE:
      return "D1";
    case RDKit::Bond::BondType::DATIVE:
      return "D";
    case RDKit::Bond::BondType::DATIVEL:
      return "DL";
    case RDKit::Bond::BondType::DATIVER:
      return "DR";
    case RDKit::Bond::BondType::OTHER:
      return "Other";
    case RDKit::Bond::BondType::ZERO:
      return "0";
  }
  return ("");
}
constexpr const char *bondDirToString(RDKit::Bond::BondDir d) {
  switch (d) {
    case RDKit::Bond::BondDir::NONE:
      return "NONE";
    case RDKit::Bond::BondDir::BEGINWEDGE:
      return "wedge";
    case RDKit::Bond::BondDir::BEGINDASH:
      return "dash";
    case RDKit::Bond::BondDir::ENDDOWNRIGHT:
      return "\\";
    case RDKit::Bond::BondDir::ENDUPRIGHT:
      return "/";
    case RDKit::Bond::BondDir::EITHERDOUBLE:
      return "x";
    case RDKit::Bond::BondDir::UNKNOWN:
      return "?";
  }
  return ("");
}
constexpr const char *bondStereoToString(RDKit::Bond::BondStereo d) {
  switch (d) {
    case RDKit::Bond::BondStereo::STEREONONE:
      return "NONE";
    case RDKit::Bond::BondStereo::STEREOANY:
      return "ANY";
    case RDKit::Bond::BondStereo::STEREOZ:
      return "Z";
    case RDKit::Bond::BondStereo::STEREOE:
      return "E";
    case RDKit::Bond::BondStereo::STEREOCIS:
      return "CIS";
    case RDKit::Bond::BondStereo::STEREOTRANS:
      return "TRANS";
    case RDKit::Bond::BondStereo::STEREOATROPCW:
      return "CW";
    case RDKit::Bond::BondStereo::STEREOATROPCCW:
      return "CCW";
  }
  return ("");
}
}  // namespace

std::ostream &operator<<(std::ostream &target, const RDKit::Bond &bond) {
  target << bond.getIdx() << " ";
  target << bond.getBeginAtomIdx() << "->" << bond.getEndAtomIdx();
  target << " order: " << bondTypeToString(bond.getBondType());
  if (bond.getBondDir()) {
    target << " dir: " << bondDirToString(bond.getBondDir());
  }
  if (bond.getStereo()) {
    target << " stereo: " << bondStereoToString(bond.getStereo());
    if (bond.getStereoAtoms().size() == 2) {
      const auto &ats = bond.getStereoAtoms();
      target << " ats: (" << ats[0] << " " << ats[1] << ")";
    }
    if (bond.getStereo() == RDKit::Bond::BondStereo::STEREOATROPCCW ||
        bond.getStereo() == RDKit::Bond::BondStereo::STEREOATROPCW) {
      RDKit::Atropisomers::AtropAtomAndBondVec atomAndBonds[2];
      if (RDKit::Atropisomers::getAtropisomerAtomsAndBonds(
              &bond, atomAndBonds, bond.getOwningMol())) {
        target << " bonds: (";
        for (auto i = 0u; i < atomAndBonds[0].second.size(); ++i) {
          if (i) {
            target << " ";
          }
          target << atomAndBonds[0].second[i]->getIdx();
        }
        for (auto i = 0u; i < atomAndBonds[1].second.size(); ++i) {
          target << " " << atomAndBonds[1].second[i]->getIdx();
        }
        target << ")";
      }
    }
  }
  if (bond.getIsConjugated()) {
    target << " conj?: " << bond.getIsConjugated();
  }
  if (bond.getIsAromatic()) {
    target << " aromatic?: " << bond.getIsAromatic();
  }

  return target;
}