/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/CommonTools/RecoUtils/plugins/PF_PU_FirstVertexTracks.cc

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// -*- C++ -*-
//
// Package:    PF_PU_AssoMap
// Class:      PF_PU_FirstVertexTracks
// 
//
// Original Author:  Matthias Geisler
//         Created:  Wed Apr 18 14:48:37 CEST 2012
// $Id: PF_PU_FirstVertexTracks.cc,v 1.2 2013/05/23 15:41:36 gartung Exp $
//
//
#include "CommonTools/RecoUtils/interface/PF_PU_FirstVertexTracks.h"

// system include files
#include <vector>
#include <string>

// user include files
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Common/interface/AssociationMap.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/OneToManyWithQuality.h"
#include "DataFormats/Common/interface/OneToManyWithQualityGeneric.h"
#include "DataFormats/Common/interface/View.h"

#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackReco/interface/TrackBase.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectronFwd.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"

//
// constants, enums and typedefs
//
   
using namespace edm;
using namespace std;
using namespace reco;

typedef AssociationMap<OneToManyWithQuality< VertexCollection, TrackCollection, int> > TrackToVertexAssMap;
typedef AssociationMap<OneToManyWithQuality< TrackCollection, VertexCollection, int> > VertexToTrackAssMap;

typedef vector<pair<TrackRef, int> > TrackQualityPairVector;


//
// static data member definitions
//

//
// constructors and destructor
//
PF_PU_FirstVertexTracks::PF_PU_FirstVertexTracks(const edm::ParameterSet& iConfig)
{
   //now do what ever other initialization is needed

        input_AssociationType_ = iConfig.getParameter<edm::InputTag>("AssociationType");

        input_AssociationMap_ = iConfig.getParameter<InputTag>("AssociationMap");

        input_generalTracksCollection_ = iConfig.getParameter<InputTag>("TrackCollection");

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

        input_MinQuality_ = iConfig.getParameter<int>("MinQuality");

   //register your products

        if ( input_AssociationType_.label() == "TracksToVertex" ) {
          produces<TrackCollection>("T2V");
        } else {
          if ( input_AssociationType_.label() == "VertexToTracks" ) {
            produces<TrackCollection>("V2T");
          } else {
            if ( input_AssociationType_.label() == "Both" ) {
              produces<TrackCollection>("T2V");
              produces<TrackCollection>("V2T");
            } else {
              std::cout << "No correct InputTag for AssociationType!" << std::endl;
              std::cout << "Won't produce any TrackCollection!" << std::endl;
            }
          }
        }

}


PF_PU_FirstVertexTracks::~PF_PU_FirstVertexTracks()
{
 
   // do anything here that needs to be done at desctruction time
   // (e.g. close files, deallocate resources etc.)

}


//
// member functions
//

// ------------ method called to produce the data  ------------
void
PF_PU_FirstVertexTracks::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{

        auto_ptr<TrackCollection> t2v_firstvertextracks(new TrackCollection() );
        auto_ptr<TrackCollection> v2t_firstvertextracks(new TrackCollection() );

        bool t2vassmap = false;
        bool v2tassmap = false;
  
        //get the input vertex<->general track association map
        Handle<TrackToVertexAssMap> t2vAM;
        Handle<VertexToTrackAssMap> v2tAM;
        
        string asstype = input_AssociationType_.label();

        if ( ( asstype == "TracksToVertex" ) || ( asstype == "Both" ) ) {
          if ( iEvent.getByLabel(input_AssociationMap_, t2vAM ) ) {
            t2vassmap = true;
          }
        }

        if ( ( asstype == "VertexToTracks" ) || ( asstype == "Both" ) ) {
          if ( iEvent.getByLabel(input_AssociationMap_, v2tAM ) ) {
            v2tassmap = true;
          }
        }

        if ( !t2vassmap && !v2tassmap ) {
          cout << "No input collection could be found" << endl;
          return;
        }
 
        //get the input track collection
        Handle<TrackCollection> input_trckcollH;
        iEvent.getByLabel(input_generalTracksCollection_,input_trckcollH);

        if ( t2vassmap ){

          const TrackQualityPairVector trckcoll = t2vAM->begin()->val;

          //get the tracks associated to the first vertex and store them in a track collection
          for (unsigned int trckcoll_ite = 0; trckcoll_ite < trckcoll.size(); trckcoll_ite++){

            float quality = trckcoll[trckcoll_ite].second;

            if ( quality>=input_MinQuality_ ) { 

              TrackRef AMtrkref = trckcoll[trckcoll_ite].first;

              for(unsigned int index_input_trck=0; index_input_trck<input_trckcollH->size(); index_input_trck++){

                TrackRef input_trackref = TrackRef(input_trckcollH,index_input_trck);

                if( TrackMatch(*AMtrkref,*input_trackref) ){

                  t2v_firstvertextracks->push_back(*AMtrkref);
                  break;
                              
                } 

              }

            }

          }

          iEvent.put( t2v_firstvertextracks, "T2V" );

        } 

        if ( v2tassmap ) {
 
          //get the input vertex collection
          Handle<VertexCollection> input_vtxcollH;
          iEvent.getByLabel(input_VertexCollection_,input_vtxcollH);

          VertexRef firstVertexRef(input_vtxcollH,0);

          VertexToTrackAssMap::const_iterator v2t_ite;

          for(v2t_ite=v2tAM->begin(); v2t_ite!=v2tAM->end(); v2t_ite++){

            TrackRef AMtrkref = v2t_ite->key;

            for(unsigned int index_input_trck=0; index_input_trck<input_trckcollH->size(); index_input_trck++){

              TrackRef input_trackref = TrackRef(input_trckcollH,index_input_trck);

              if(TrackMatch(*AMtrkref,*input_trackref)){
    
                for(unsigned v_ite = 0; v_ite<(v2t_ite->val).size(); v_ite++){

                  VertexRef vtxref = (v2t_ite->val)[v_ite].first;
                  float quality = (v2t_ite->val)[v_ite].second;

                  if ( (vtxref==firstVertexRef) && (quality>=input_MinQuality_) ){
                    v2t_firstvertextracks->push_back(*AMtrkref);
                  }

                }

              }

            }

          }

          iEvent.put( v2t_firstvertextracks, "V2T" );

        }

}

bool 
PF_PU_FirstVertexTracks::TrackMatch(const Track& track1,const Track& track2)
{

        return (
          (track1).eta()  == (track2).eta() &&
          (track1).phi()  == (track2).phi() &&
          (track1).chi2() == (track2).chi2() &&
          (track1).ndof() == (track2).ndof() &&
          (track1).p()    == (track2).p()
        );

}

// ------------ method fills 'descriptions' with the allowed parameters for the module  ------------
void
PF_PU_FirstVertexTracks::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  //The following says we do not know what parameters are allowed so do no validation
  // Please change this to state exactly what you do use, even if it is no parameters
  edm::ParameterSetDescription desc;
  desc.setUnknown();
  descriptions.addDefault(desc);
}

//define this as a plug-in
DEFINE_FWK_MODULE(PF_PU_FirstVertexTracks);