/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/CommonTools/RecoUtils/src/PFCand_AssoMapAlgos.cc

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#include "CommonTools/RecoUtils/interface/PFCand_AssoMapAlgos.h"

#include "TrackingTools/IPTools/interface/IPTools.h"

using namespace edm;
using namespace std;
using namespace reco;

/*************************************************************************************/
/* dedicated constructor for the algorithms                                          */ 
/*************************************************************************************/

PFCand_AssoMapAlgos::PFCand_AssoMapAlgos(const edm::ParameterSet& iConfig):PF_PU_AssoMapAlgos(iConfig)
{

        input_MaxNumAssociations_ = iConfig.getParameter<int>("MaxNumberOfAssociations");

        input_VertexCollection_= iConfig.getParameter<InputTag>("VertexCollection");

        input_BeamSpot_= iConfig.getParameter<InputTag>("BeamSpot");

}

/*************************************************************************************/
/* get all needed collections at the beginning                                       */ 
/*************************************************************************************/

void 
PFCand_AssoMapAlgos::GetInputCollections(edm::Event& iEvent, const edm::EventSetup& iSetup)
{

        PF_PU_AssoMapAlgos::GetInputCollections(iEvent, iSetup);
  
        //get the offline beam spot
        iEvent.getByLabel(input_BeamSpot_, beamspotH);
          
        //get the input vertex collection
        iEvent.getByLabel(input_VertexCollection_, vtxcollH);

        iSetup.get<IdealMagneticFieldRecord>().get(bFieldH);

}

/*************************************************************************************/
/* create the pf candidate to vertex association map                                 */ 
/*************************************************************************************/

std::auto_ptr<PFCandToVertexAssMap> 
PFCand_AssoMapAlgos::CreatePFCandToVertexMap(edm::Handle<reco::PFCandidateCollection> pfCandH, const edm::EventSetup& iSetup)
{

        auto_ptr<PFCandToVertexAssMap> pfcand2vertex(new PFCandToVertexAssMap());

        int num_vertices = vtxcollH->size();
        if ( num_vertices < input_MaxNumAssociations_) input_MaxNumAssociations_ = num_vertices;
   
        for( unsigned i=0; i<pfCandH->size(); i++ ) {
     
          PFCandidateRef candref(pfCandH, i);

          vector<VertexRef>* vtxColl_help = CreateVertexVector(vtxcollH);

          VertexPfcQuality VtxPfcQual;

          TrackRef PFCtrackref = candref->trackRef();

          if ( PFCtrackref.isNull() ){

            for ( int assoc_ite = 0; assoc_ite < input_MaxNumAssociations_; ++assoc_ite ) {

              int quality = -1 - assoc_ite; 

              // Insert the best vertex and the pair of track and the quality of this association in the map
              pfcand2vertex->insert( vtxColl_help->at(0), make_pair(candref, quality) );
 
              PF_PU_AssoMapAlgos::EraseVertex(vtxColl_help, vtxColl_help->at(0));

            }       

          } else {

            TransientTrack transtrk(PFCtrackref, &(*bFieldH) );
            transtrk.setBeamSpot(*beamspotH);
            transtrk.setES(iSetup);

            for ( int assoc_ite = 0; assoc_ite < input_MaxNumAssociations_; ++assoc_ite ) {

              VertexStepPair assocVtx = FindAssociation(PFCtrackref, vtxColl_help, bFieldH, iSetup, beamspotH, assoc_ite);       
              int step = assocVtx.second;
              double distance = ( IPTools::absoluteImpactParameter3D( transtrk, *(assocVtx.first) ) ).second.value();
           
              int quality = DefineQuality(assoc_ite, step, distance);
    
              // Insert the best vertex and the pair of track and the quality of this association in the map
              pfcand2vertex->insert( assocVtx.first, make_pair(candref, quality) );

              PF_PU_AssoMapAlgos::EraseVertex(vtxColl_help, assocVtx.first);

            }

          }

          delete vtxColl_help;    
        }

        return pfcand2vertex;

}

/*************************************************************************************/
/* create the vertex to pf candidate association map                                 */ 
/*************************************************************************************/

std::auto_ptr<VertexToPFCandAssMap> 
PFCand_AssoMapAlgos::CreateVertexToPFCandMap(edm::Handle<reco::PFCandidateCollection> pfCandH, const edm::EventSetup& iSetup)
{

        auto_ptr<VertexToPFCandAssMap> vertex2pfcand(new VertexToPFCandAssMap());

        int num_vertices = vtxcollH->size();
        if ( num_vertices < input_MaxNumAssociations_) input_MaxNumAssociations_ = num_vertices;
   
        for( unsigned i=0; i<pfCandH->size(); i++ ) {
     
          PFCandidateRef candref(pfCandH, i);

          vector<VertexRef>* vtxColl_help = CreateVertexVector(vtxcollH);

          VertexPfcQuality VtxPfcQual;

          TrackRef PFCtrackref = candref->trackRef();

          if ( PFCtrackref.isNull() ){

            for ( int assoc_ite = 0; assoc_ite < input_MaxNumAssociations_; ++assoc_ite ) {

              int quality = -1 - assoc_ite; 

              // Insert the best vertex and the pair of track and the quality of this association in the map
              vertex2pfcand->insert( candref, make_pair(vtxColl_help->at(0), quality) );
 
              PF_PU_AssoMapAlgos::EraseVertex(vtxColl_help, vtxColl_help->at(0));

            }       

          } else {

            TransientTrack transtrk(PFCtrackref, &(*bFieldH) );
            transtrk.setBeamSpot(*beamspotH);
            transtrk.setES(iSetup);

            for ( int assoc_ite = 0; assoc_ite < input_MaxNumAssociations_; ++assoc_ite ) {

              VertexStepPair assocVtx = FindAssociation(PFCtrackref, vtxColl_help, bFieldH, iSetup, beamspotH, assoc_ite);       
              int step = assocVtx.second;
              double distance = ( IPTools::absoluteImpactParameter3D( transtrk, *(assocVtx.first) ) ).second.value();
           
              int quality = DefineQuality(assoc_ite, step, distance);
    
              // Insert the best vertex and the pair of track and the quality of this association in the map
              vertex2pfcand->insert( candref, make_pair(assocVtx.first, quality) );

              PF_PU_AssoMapAlgos::EraseVertex(vtxColl_help, assocVtx.first);

            }

          }

          delete vtxColl_help;
        }

        return vertex2pfcand;
}

/*************************************************************************************/
/* create the vertex to pf candidate association map                                 */ 
/*************************************************************************************/

std::auto_ptr<PFCandToVertexAssMap> 
PFCand_AssoMapAlgos::SortPFCandAssociationMap(PFCandToVertexAssMap* pfcvertexassInput)
{
        //create a new PFCandVertexAssMap for the Output which will be sorted
        auto_ptr<PFCandToVertexAssMap> pfcvertexassOutput(new PFCandToVertexAssMap() );

        //Create and fill a vector of pairs of vertex and the summed (pT)**2 of the pfcandidates associated to the vertex 
        VertexPtsumVector vertexptsumvector;

        //loop over all vertices in the association map
        for(PFCandToVertexAssMap::const_iterator assomap_ite=pfcvertexassInput->begin(); assomap_ite!=pfcvertexassInput->end(); assomap_ite++){

          const VertexRef assomap_vertexref = assomap_ite->key;
          const PFCandQualityPairVector pfccoll = assomap_ite->val;

          float ptsum = 0;
 
          PFCandidateRef pfcandref;

          //get the pfcandidates associated to the vertex and calculate the pT**2
          for(unsigned int pfccoll_ite=0; pfccoll_ite<pfccoll.size(); pfccoll_ite++){

            pfcandref = pfccoll[pfccoll_ite].first;
            int quality = pfccoll[pfccoll_ite].second;

            if ( (quality<=2) && (quality!=-1) ) continue;       

            double man_pT = pfcandref->pt();
            if(man_pT>0.) ptsum+=man_pT*man_pT;

          }

          vertexptsumvector.push_back(make_pair(assomap_vertexref,ptsum));

        }

        while (vertexptsumvector.size()!=0){

          VertexRef vertexref_highestpT;
          float highestpT = 0.;
          int highestpT_index = 0;

          for(unsigned int vtxptsumvec_ite=0; vtxptsumvec_ite<vertexptsumvector.size(); vtxptsumvec_ite++){
 
            if(vertexptsumvector[vtxptsumvec_ite].second>highestpT){

              vertexref_highestpT = vertexptsumvector[vtxptsumvec_ite].first;
              highestpT = vertexptsumvector[vtxptsumvec_ite].second;
              highestpT_index = vtxptsumvec_ite;
        
            }

          }
          
          //loop over all vertices in the association map
          for(PFCandToVertexAssMap::const_iterator assomap_ite=pfcvertexassInput->begin(); assomap_ite!=pfcvertexassInput->end(); assomap_ite++){

            const VertexRef assomap_vertexref = assomap_ite->key;
            const PFCandQualityPairVector pfccoll = assomap_ite->val;

            //if the vertex from the association map the vertex with the highest pT 
            //insert all associated pfcandidates in the output Association Map
            if(assomap_vertexref==vertexref_highestpT) 
              for(unsigned int pfccoll_ite=0; pfccoll_ite<pfccoll.size(); pfccoll_ite++) 
                pfcvertexassOutput->insert(assomap_vertexref,pfccoll[pfccoll_ite]);
 
          }

          vertexptsumvector.erase(vertexptsumvector.begin()+highestpT_index);   

        }

        return pfcvertexassOutput;
}