/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/Calibration/IsolatedParticles/src/MatchingSimTrack.cc

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#include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"

#include "Calibration/IsolatedParticles/interface/MatchingSimTrack.h"

#include <iostream>

namespace spr{

  edm::SimTrackContainer::const_iterator matchedSimTrack(const edm::Event& iEvent, edm::Handle<edm::SimTrackContainer>& SimTk, edm::Handle<edm::SimVertexContainer>& SimVtx, const reco::Track* pTrack, TrackerHitAssociator& associate, bool debug){
  
    edm::SimTrackContainer::const_iterator itr = SimTk->end();;
    
    edm::SimTrackContainer::const_iterator simTrkItr;
    edm::SimVertexContainer::const_iterator simVtxItr;
 
    //Get the vector of PsimHits associated to TrackerRecHits and select the 
    //matching SimTrack on the basis of maximum occurance of trackIds
    std::vector<unsigned int> trkId, trkOcc;
    int i=0;
    for (trackingRecHit_iterator iTrkHit = pTrack->recHitsBegin(); iTrkHit != pTrack->recHitsEnd(); ++iTrkHit, ++i) {
    
      std::vector<PSimHit> matchedSimIds = associate.associateHit((**iTrkHit));
      for (unsigned int isim=0; isim<matchedSimIds.size(); isim++) {
        unsigned tkId = matchedSimIds[isim].trackId();
        bool found = false;
        for (unsigned int j=0; j<trkId.size(); j++) {
          if ( tkId == trkId[j] ) {
            trkOcc[j]++;
            found = true;
            break;
          }
        }
        if (!found) { trkId.push_back(tkId); trkOcc.push_back(1); }
      }
    }

    if (debug) {
      std::cout << "Reconstructed Track with " << i << " recHits.";
      for (unsigned int isim=0; isim<trkId.size(); isim++){
        std::cout << "\n trkId " << trkId[isim] << "  Occurance " << trkOcc[isim] << ", ";
      } 
      std::cout << std::endl;
    }
  
    int matchedId=0; 
    unsigned int matchSimTrk=0;
    if (trkOcc.size() > 0) {
      unsigned int maxTrkOcc=0, idxMax=0;
      for(unsigned int j=0; j<trkOcc.size(); j++) {
        if(trkOcc[j] > maxTrkOcc ) { maxTrkOcc = trkOcc[j]; idxMax = j; }
      }
      matchSimTrk = trkId[idxMax];
      for (simTrkItr = SimTk->begin(); simTrkItr!= SimTk->end(); simTrkItr++) {
        if ( simTrkItr->trackId() == matchSimTrk ) {
          matchedId = simTrkItr->type();
          if (debug) std::cout << "matched trackId (maximum occurance) " << matchSimTrk << " type " << matchedId << std::endl;
          itr = simTrkItr;
          break;
        }
      }
    }
  
    if (matchedId==0 && debug) {
      std::cout << "Could not find matched SimTrk and track history now " << std::endl;
    }

    return itr;
  }

  //Returns a vector of TrackId originating from the matching SimTrack
  std::vector<int> matchedSimTrackId(const edm::Event& iEvent, edm::Handle<edm::SimTrackContainer>& SimTk, edm::Handle<edm::SimVertexContainer>& SimVtx, const reco::Track* pTrack, TrackerHitAssociator& associate, bool debug) {

    // get the matching SimTrack
    edm::SimTrackContainer::const_iterator trkInfo = spr::matchedSimTrack(iEvent, SimTk, SimVtx, pTrack,associate, debug);
    unsigned int matchSimTrk = trkInfo->trackId();
    if (debug) std::cout << "matchedSimTrackId finds the SimTrk ID of the current track to be " << matchSimTrk << std::endl;
  
    std::vector<int> matchTkid;
    if( trkInfo->type() != 0) {
      edm::SimTrackContainer::const_iterator simTrkItr;
      for(simTrkItr = SimTk->begin(); simTrkItr!= SimTk->end(); simTrkItr++){
        if (validSimTrack(matchSimTrk, simTrkItr, SimTk, SimVtx, false))
          matchTkid.push_back((int)simTrkItr->trackId());
      }
    }
    return matchTkid;
  }

  spr::simTkInfo matchedSimTrackInfo(unsigned int simTkId, edm::Handle<edm::SimTrackContainer>& SimTk, edm::Handle<edm::SimVertexContainer>& SimVtx, bool debug) {
    spr::simTkInfo info;
    for (edm::SimTrackContainer::const_iterator simTrkItr=SimTk->begin(); 
         simTrkItr!= SimTk->end(); simTrkItr++) {
      if (simTkId == simTrkItr->trackId()) {
        if (spr::validSimTrack(simTkId, simTrkItr, SimTk, SimVtx, debug)) {
          info.found  = true;
          info.pdgId  = simTrkItr->type();
          info.charge = simTrkItr->charge();
        } else {
          edm::SimTrackContainer::const_iterator parentItr =  spr::parentSimTrack(simTrkItr, SimTk, SimVtx, debug);
          if (debug) {
            if (parentItr != SimTk->end() ) std::cout << "original parent of " << simTrkItr->trackId() << " " << parentItr->trackId() << ", " << parentItr->type() << std::endl;
            else                            std::cout << "original parent of " << simTrkItr->trackId() << " not found" << std::endl;
          }
          if (parentItr != SimTk->end()) {
            info.found  = true;
            info.pdgId  = parentItr->type();
            info.charge = parentItr->charge();
          }
        }
        break;
      }
    }
    return info;
  }

  // Checks if this SimTrack=thisTrkItr originates from the one with trackId=simTkId
  bool validSimTrack(unsigned int simTkId, edm::SimTrackContainer::const_iterator thisTrkItr, edm::Handle<edm::SimTrackContainer>& SimTk, edm::Handle<edm::SimVertexContainer>& SimVtx, bool debug){
    
    if (debug) std::cout << "Inside validSimTrack: trackId " << thisTrkItr->trackId() << " vtxIndex " <<  thisTrkItr->vertIndex() << " to be matched to " << simTkId << std::endl;
    
    //This track originates from simTkId
    if (thisTrkItr->trackId() == simTkId) return true;

    //Otherwise trace back the history using SimTracks and SimVertices
    int vertIndex = thisTrkItr->vertIndex();
    if (vertIndex == -1 || vertIndex >= (int)SimVtx->size()) return false;
    
    edm::SimVertexContainer::const_iterator simVtxItr= SimVtx->begin();
    for (int iv=0; iv<vertIndex; iv++) simVtxItr++;
    int parent = simVtxItr->parentIndex();
    if (debug) std::cout << "validSimTrack:: parent index " << parent <<" ";
    if (parent < 0 && simVtxItr != SimVtx->begin()) {
      const math::XYZTLorentzVectorD pos1 = simVtxItr->position();
      for (simVtxItr=SimVtx->begin(); simVtxItr!=SimVtx->end(); ++simVtxItr) {
        if (simVtxItr->parentIndex() > 0) {
          const math::XYZTLorentzVectorD pos2 = pos1 - simVtxItr->position();
          double dist = pos2.P();
          if (dist < 0.001) {
            parent = simVtxItr->parentIndex();
            break;
          }
        }
      }
    }
    if (debug) std::cout << "final index " << parent << std::endl;;
    for(edm::SimTrackContainer::const_iterator simTrkItr= SimTk->begin(); simTrkItr!= SimTk->end(); simTrkItr++){
      if ((int)simTrkItr->trackId() == parent && simTrkItr != thisTrkItr) return  validSimTrack(simTkId, simTrkItr, SimTk, SimVtx, debug) ; 
    }
  
    return false;
  
  }

  //Returns the parent of a SimTrack
  edm::SimTrackContainer::const_iterator parentSimTrack(edm::SimTrackContainer::const_iterator thisTrkItr, edm::Handle<edm::SimTrackContainer>& SimTk, edm::Handle<edm::SimVertexContainer>& SimVtx, bool debug){
  
    edm::SimTrackContainer::const_iterator itr = SimTk->end();

    int vertIndex = thisTrkItr->vertIndex();
    int type = thisTrkItr->type(); int charge = (int)thisTrkItr->charge();
    if (debug) std::cout << "SimTrackParent " << thisTrkItr->trackId() << " Vertex " <<  vertIndex << " Type " << type << " Charge " << charge << std::endl;

    if( vertIndex == -1 )                      return thisTrkItr;  
    else if (vertIndex >= (int)SimVtx->size()) return itr; 

    edm::SimVertexContainer::const_iterator simVtxItr= SimVtx->begin();
    for (int iv=0; iv<vertIndex; iv++) simVtxItr++;
    int parent = simVtxItr->parentIndex();

    if (parent < 0 && simVtxItr != SimVtx->begin()) {
      const math::XYZTLorentzVectorD pos1 = simVtxItr->position();
      for (simVtxItr=SimVtx->begin(); simVtxItr!=SimVtx->end(); ++simVtxItr) {
        if (simVtxItr->parentIndex() > 0) {
          const math::XYZTLorentzVectorD pos2 = pos1 - simVtxItr->position();
          double dist = pos2.P();
          if (dist < 0.001) {
            parent = simVtxItr->parentIndex();
            break;
          }
        }
      }
    }
    for (edm::SimTrackContainer::const_iterator simTrkItr= SimTk->begin(); simTrkItr!= SimTk->end(); simTrkItr++){
      if ((int)simTrkItr->trackId() == parent && simTrkItr != thisTrkItr) return  parentSimTrack(simTrkItr, SimTk, SimVtx, debug); 
    }

    return thisTrkItr; 
  }


}