/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/RecoHI/HiMuonAlgos/plugins/HIMuonTrackingRegionProducer.h

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#ifndef RecoHI_HiTracking_HIMuonTrackingRegionProducer_H 
#define RecoHI_HiTracking_HIMuonTrackingRegionProducer_H

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

#include "RecoTracker/TkTrackingRegions/interface/TrackingRegionProducer.h"
#include "RecoTracker/TkTrackingRegions/interface/RectangularEtaPhiTrackingRegion.h"
#include "RecoMuon/GlobalTrackingTools/interface/MuonTrackingRegionBuilder.h"
#include "RecoMuon/TrackingTools/interface/MuonServiceProxy.h"

#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/Event.h"

class HIMuonTrackingRegionProducer : public TrackingRegionProducer {
  
 public:
  
  HIMuonTrackingRegionProducer(const edm::ParameterSet& cfg) { 
        
    // get parameters from PSet
    theMuonSource                         = cfg.getParameter<edm::InputTag>("MuonSrc");
    
    // initialize region builder
    edm::ParameterSet regionBuilderPSet   = cfg.getParameter<edm::ParameterSet>("MuonTrackingRegionBuilder");
    theRegionBuilder                      = new MuonTrackingRegionBuilder(regionBuilderPSet);

    // initialize muon service proxy
    edm::ParameterSet servicePSet         = cfg.getParameter<edm::ParameterSet>("ServiceParameters");
    theService                            = new MuonServiceProxy(servicePSet);

  }  
  

  virtual ~HIMuonTrackingRegionProducer(){}
  

  virtual std::vector<TrackingRegion* > regions(const edm::Event& ev, const edm::EventSetup& es) const {
    
    // initialize output vector of tracking regions
    std::vector<TrackingRegion* > result;

    // initialize the region builder
    theService->update(es);
    theRegionBuilder->init(theService);
    theRegionBuilder->setEvent(ev);

    // get stand-alone muon collection
    edm::Handle<reco::TrackCollection> muonH;
    ev.getByLabel(theMuonSource ,muonH);
    
    // loop over all muons and add a tracking region for each
    // that passes the requirements specified to theRegionBuilder
    unsigned int nMuons = muonH->size();
    //std::cout << "there are " << nMuons << " muon(s)" << std::endl;

    // TO DO: this can be extended further to a double-loop 
    // over all combinations of muons, returning tracking regions
    // for pairs that pass some loose invariant mass cuts
    for(unsigned int imu=0; imu<nMuons; imu++) {
      reco::TrackRef muRef(muonH, imu);
      //std::cout << "muon #" << imu << ": pt=" << muRef->pt() << std::endl;
      RectangularEtaPhiTrackingRegion *etaphiRegion = theRegionBuilder->region(muRef);
      result.push_back(etaphiRegion);
    }

    return result;

  }
  
  
 private:
  
  edm::InputTag theMuonSource;
  MuonTrackingRegionBuilder* theRegionBuilder;
  MuonServiceProxy* theService;
  
};

#endif