//
//  Copyright (C) 2003-2006 Rational Discovery LLC
//
//   @@ 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 <Catalogs/Catalog.h>
#include "FragCatGenerator.h"
#include "FragCatalogEntry.h"
#include "FragCatParams.h"
#include "FragCatalogUtils.h"

#include <RDGeneral/types.h>
#include <GraphMol/RDKitBase.h>
#include <GraphMol/Subgraphs/SubgraphUtils.h>
#include <GraphMol/Subgraphs/Subgraphs.h>
#include <GraphMol/SmilesParse/SmilesWrite.h>
#include <GraphMol/SmilesParse/SmilesParse.h>

namespace RDKit {
unsigned int addOrder1Paths(PATH_LIST &paths, const ROMol &mol,
                            FragCatalog *fcat, DOUBLE_INT_MAP &mapkm1,
                            const MatchVectType &aidToFid) {
  PRECONDITION(fcat, "");
  bool found;
  const FragCatalogEntry *entry;
  // INT_VECT o1entries;
  const FragCatParams *fparams = fcat->getCatalogParams();

  unsigned int lLen = fparams->getLowerFragLength();
  unsigned int uLen = fparams->getUpperFragLength();
  CHECK_INVARIANT(lLen <= uLen, "");
  unsigned int n01 = 0;
  double tol = fparams->getTolerance();

  PATH_LIST_CI pi;
  double invar;
  int vid;
  for (pi = paths.begin(); pi != paths.end(); pi++) {
    auto *nent = new FragCatalogEntry(&mol, (*pi), aidToFid);
    // loop over each order 1 path
    found = false;
    const INT_VECT &o1entries = fcat->getEntriesOfOrder(1);
    for (auto eti : o1entries) {
      // loop over all the order 1 entries all ready present in the catalog
      entry = fcat->getEntryWithIdx(eti);
      if (nent->match(entry, tol)) {
        found = true;
        invar = computeIntVectPrimesProduct(*pi);
        mapkm1[invar] = eti;
        delete nent;
        nent = nullptr;
        break;
      }
    }
    if (!found) {
      bool updateSigL = false;
      if ((lLen <= 1) && (uLen >= 1)) {
        // if order 1 subgraphs are of interest in fingerprinting
        // assign a bit to this fragment when we add to the catalog and update
        // fingerprint len
        updateSigL = true;
      }
      nent->setDescription(fparams);
      vid = fcat->addEntry(nent, updateSigL);
      invar = computeIntVectPrimesProduct(*pi);
      mapkm1[invar] = vid;
      n01++;
    }
  }
  return n01;
}

unsigned int addHigherOrderPaths(const INT_PATH_LIST_MAP &allPaths,
                                 const ROMol &mol, FragCatalog *fcat,
                                 DOUBLE_INT_MAP &mapkm1,
                                 const MatchVectType &aidToFid) {
  PRECONDITION(fcat, "");

  // This works something like this
  // - for each path of order k in the mol
  //    - we find all connected subpaths
  //      of order (k-1)
  //    - find the entries in the catalog that correspond to each of these
  //      order (k-1) paths (using mapkm1 - remember that this maps the
  //      invariant
  //      of a path to the entry ID in the catalog graph)
  //    - Find the intersection of the down entries of these order (k-1)
  //    - check if order k path we are testing matches any of the order k
  //    entries in this intersection
  //    - if we find a match move onto the next order k path
  //    - if we do not find a match
  //       - create an entry for the order k path and add it to the catalog
  //       - also add out edges from each of the entries corresponding to the
  //       order k-1
  //         subgraphs to this path.

  PATH_LIST paths;
  PATH_LIST_CI pi;
  bool found;
  double invar, sinvar;
  int entId;
  DOUBLE_INT_MAP mapk;
  int mEntId, vid;
  const FragCatParams *fparams = fcat->getCatalogParams();

  unsigned int lLen = fparams->getLowerFragLength();
  unsigned int uLen = fparams->getUpperFragLength();
  double tol = fparams->getTolerance();
  unsigned int nrem =
      0;  // counter for number of fragments added to the catalog
  const FragCatalogEntry *entry;

  INT_PATH_LIST_MAP_CI ordi;
  for (ordi = allPaths.begin(); ordi != allPaths.end(); ordi++) {
    if (ordi->first < 2) {
      continue;
    }
    mapk.clear();

    for (pi = (*ordi).second.begin(); pi != (*ordi).second.end(); pi++) {
      found = false;

      auto *nent = new FragCatalogEntry(&mol, (*pi), aidToFid);
      nent->setDescription(fparams);

      unsigned int scnt = 0;
      INT_VECT intersect, tmpVect;
      invar = computeIntVectPrimesProduct(*pi);
      DOUBLE_VECT sinvarV;

      // loop over the subpaths (order (k-1) ) (by ignoring one bond
      // at a time from consideration) and find out which entries int eh catalog
      // they correspond to
      // and make an intersection of the down entries (i.e. order k entries that
      // contain these order k-1
      // entries. - we can basically limit our search for an isomorphic entry in
      // the
      // catalog of the order k path from the molecule to this intersection list
      PATH_TYPE::const_iterator pii;
      for (pii = pi->begin(); pii != pi->end(); pii++) {
        sinvar = invar / firstThousandPrimes[*pii];

        // here is a check for "did we see this path before ?"
        // this should also take care of disconnected subpaths (since the
        // catalog should have only connected subgraphs)
        if (mapkm1.find(sinvar) == mapkm1.end()) {
          continue;
        }

        // push this sinvar onto a vector
        // we need them to add edges int he catalog graph
        sinvarV.push_back(sinvar);

        entId = mapkm1[sinvar];
        if (scnt == 0) {
          intersect = fcat->getDownEntryList(entId);
          scnt++;
        } else {
          tmpVect = intersect;
          Intersect(fcat->getDownEntryList(entId), tmpVect, intersect);
          scnt++;
        }
      }

      // now search through the intersection list to check if we already have a
      // isomorphic entry in the catalog
      for (auto iti : intersect) {
        entry = fcat->getEntryWithIdx(iti);
        if (nent->match(entry, tol)) {
          found = true;
          mEntId = iti;
          delete nent;
          nent = nullptr;
          break;
        }
      }

      if (found) {
        // update the mapk so that the next time we see this path (when
        // dealing with order k+1 path we know which entry in the catalog
        // to look at
        mapk[invar] = mEntId;
      } else {
        // we have never seen this subgraph before add it to the catalog
        unsigned int ordr = nent->getOrder();
        bool updateSigL = false;
        if ((ordr >= lLen) && (ordr <= uLen)) {
          // if this order subgraphs are of interest in fingerprinting
          // assign a bit to this fragment when we add to the catalog and update
          // fingerprint len
          updateSigL = true;
        }

        vid = fcat->addEntry(nent, updateSigL);
        mapk[invar] = vid;
        nrem++;  // increment the fragment counter
        // loop over the entries corresponding to the subpaths and
        // add connections to them
        for (auto sci : sinvarV) {
          entId = mapkm1[sci];
          fcat->addEdge(entId, vid);
        }
      }  // end of never seen this order k subgraph
    }    // end of loop over order k paths in mol
    // overwrite mapkm1 with mapk before we move on to order k+1
    mapkm1 = mapk;
  }  // end of loop over path order
  return nrem;
}

unsigned int FragCatGenerator::addFragsFromMol(const ROMol &mol,
                                               FragCatalog *fcat) {
  PRECONDITION(fcat, "");

  INT_PATH_LIST_MAP allPaths;
  allPaths.clear();

  DOUBLE_INT_MAP mapkm1;

  mapkm1.clear();
  const FragCatParams *fparams = fcat->getCatalogParams();

  unsigned int lLen = fparams->getLowerFragLength();
  unsigned int uLen = fparams->getUpperFragLength();
  CHECK_INVARIANT(lLen <= uLen, "");

  // prepare the molecule to add to the catalog
  // i.e. find functional groups, remove them from the mol etc.
  MatchVectType newAidToFid;
  INT_VECT fgBonds;

  ROMol *coreMol = prepareMol(mol, fparams, newAidToFid);
  // mol->debugMol(std::cout);
  allPaths = findAllSubgraphsOfLengthsMtoN(*coreMol, 1, uLen);

  // deal with order 1 paths
  unsigned int nO1Pths =
      addOrder1Paths(allPaths[1], *coreMol, fcat, mapkm1, newAidToFid);

  // now deal with the higher order paths
  unsigned int nremPths =
      addHigherOrderPaths(allPaths, *coreMol, fcat, mapkm1, newAidToFid);

  delete coreMol;
  return (nO1Pths + nremPths);
}
}  // namespace RDKit