/data/refman/pasoursint/CMSSW_5_3_0/src/RecoEcal/EgammaClusterAlgos/src/CosmicClusterAlgo.cc

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#include "RecoEcal/EgammaClusterAlgos/interface/CosmicClusterAlgo.h"

#include <vector> //TEMP JHAUPT 4-27

// Geometry
#include "Geometry/Records/interface/CaloGeometryRecord.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/CaloTopology/interface/EcalEndcapTopology.h"
#include "Geometry/CaloTopology/interface/EcalBarrelTopology.h"

#include "RecoEcal/EgammaCoreTools/interface/ClusterEtLess.h"


// Return a vector of clusters from a collection of EcalRecHits:
//
std::vector<reco::BasicCluster> CosmicClusterAlgo::makeClusters(
                                  const EcalRecHitCollection* hits,
                                  const EcalUncalibratedRecHitCollection *uncalibhits,                            
                                  const CaloSubdetectorGeometry *geometry_p,
                                  const CaloSubdetectorTopology *topology_p,
                                  const CaloSubdetectorGeometry *geometryES_p,
                                  EcalPart ecalPart,
                                  bool regional,
                                  const std::vector<EcalEtaPhiRegion>& regions)
{
  seeds.clear();
  used_s.clear();
  canSeed_s.clear();
  clusters_v.clear();

  recHits_ = hits;
  uncalibRecHits_ = uncalibhits;
  
  inEB = true;
  double threshold = 0;
  std::string ecalPart_string;
  if (ecalPart == endcap) 
    {
      threshold = ecalEndcapSeedThreshold;
      ecalPart_string = "EndCap";
          inEB = false;
    }
  if (ecalPart == barrel) 
    {
      threshold = ecalBarrelSeedThreshold;
      ecalPart_string = "Barrel";
          inEB = true;
    }

  if (verbosity < pINFO)
    {
      std::cout << "-------------------------------------------------------------" << std::endl;
      std::cout << "Island algorithm invoked for ECAL" << ecalPart_string << std::endl;
      std::cout << "Looking for seeds, threshold used = " << threshold << " ADC" <<std::endl;
    }

  int nregions=0;
  if(regional) nregions=regions.size();

  if(!regional || nregions) {

    EcalRecHitCollection::const_iterator it;
    for(it = recHits_->begin(); it != recHits_->end(); it++)
      {   
          
          if (!uncalibRecHits_){  
             if (verbosity < pINFO)
         {
            std::cout << "-------------------------------------------------------------" << std::endl;
            std::cout << "No Uncalibrated RecHits no Uncalibrated rec hit collection available" << std::endl;
         }
         continue;
          }
  
          // if rechit affected by features other than these, do not allow if seeding
          // features are hard coded, for now; add severity?
          uint32_t rhFlag = (*it).recoFlag();
          if (!(
                rhFlag == EcalRecHit::kGood      ||
                rhFlag == EcalRecHit::kOutOfTime ||
                rhFlag == EcalRecHit::kPoorCalib
                )
              ) continue;

          EcalUncalibratedRecHitCollection::const_iterator itt =  uncalibRecHits_->find(it->id());
          
          if (itt == uncalibRecHits_->end()){  
             if (verbosity < pINFO)
         {
            std::cout << "-------------------------------------------------------------" << std::endl;
            std::cout << "No Uncalibrated RecHit associated with the RecHit Probably no Uncalibrated rec hit collection available" << std::endl;
                 }
             continue;
          }
          
      EcalUncalibratedRecHit uhit_p = *itt;

      // looking for cluster seeds        
          if (uhit_p.amplitude() <  (inEB ? ecalBarrelSeedThreshold : ecalEndcapSeedThreshold) ) continue; // 
          
          const CaloCellGeometry *thisCell = geometry_p->getGeometry(it->id());
          GlobalPoint position = thisCell->getPosition();

        // Require that RecHit is within clustering region in case
        // of regional reconstruction
        bool withinRegion = false;
        if (regional) {
          std::vector<EcalEtaPhiRegion>::const_iterator region;
          for (region=regions.begin(); region!=regions.end(); region++) {
            if (region->inRegion(position)) {
              withinRegion =  true;
              break;
            }
          }
        }

        if (!regional || withinRegion) {
          //float ET = it->energy() * sin(position.theta()); JHaupt Out 4-27-08 Et not needed for Cosmic Events...
         // if (energy >= threshold) 
          seeds.push_back(*it); // JHaupt 4-27-2008 Et -> energy, most likely not needed as there is already a threshold requirement.
        }
      }
    
  }
  
   sort(seeds.begin(), seeds.end(), EcalRecHitLess());

   if (verbosity < pINFO)
   {
      std::cout << "JH Total number of seeds found in event = " << seeds.size() << std::endl;
          for (EcalRecHitCollection::const_iterator ji = seeds.begin(); ji != seeds.end(); ++ji)
          {
              //std::cout << "JH Seed Energy " << ji->energy() << " hashed " << ((EBDetId)ji->id()).hashedIndex()  << std::endl;

          }
   }

   mainSearch(geometry_p,topology_p,geometryES_p,ecalPart );
   sort(clusters_v.rbegin(), clusters_v.rend(),ClusterEtLess());
         
   if (verbosity < pINFO)
   {
      std::cout << "---------- end of main search. clusters have been sorted ----" << std::endl;
   }
  
   return clusters_v;
 
}

// Search for clusters
//
void CosmicClusterAlgo::mainSearch(      const CaloSubdetectorGeometry *geometry_p,
                   const CaloSubdetectorTopology *topology_p,
                   const CaloSubdetectorGeometry *geometryES_p,
                   EcalPart ecalPart )
{

   if (verbosity < pINFO)
   {
      std::cout << "Building clusters............" << std::endl;
   }
     
  // Loop over seeds:
   std::vector<EcalRecHit>::iterator it;
   for (it = seeds.begin(); it != seeds.end(); it++)
   {

      // check if this crystal is able to seed
      // (event though it is already used)
      bool usedButCanSeed = false;
      if (canSeed_s.find(it->id()) != canSeed_s.end()) usedButCanSeed = true;

      // make sure the current seed does not belong to a cluster already.
      if ((used_s.find(it->id()) != used_s.end()) && (usedButCanSeed == false))
      {
         if (it == seeds.begin())
         {
            if (verbosity < pINFO)
            {
           std::cout << "##############################################################" << std::endl;
               std::cout << "DEBUG ALERT: Highest energy seed already belongs to a cluster!" << std::endl;
               std::cout << "##############################################################" << std::endl;
            }
         }

          // seed crystal is used or is used and cannot seed a cluster
          // so continue to the next seed crystal...
          continue;
      }

      // clear the vector of hits in current clusterconst EcalRecHitCollection* hits,
      current_v9.clear();
      current_v25.clear();
      current_v25Sup.clear();

      // Create a navigator at the seed
      CaloNavigator<DetId> navigator(it->id(), topology_p);
      DetId seedId = navigator.pos();
      navigator.setHome(seedId);

      // Is the seed a local maximum?
      bool localMaxima = checkMaxima(navigator);

      if (localMaxima)
      {
         // build the 5x5 taking care over which crystals //JHaupt 4-27-08 3x3 is a good option...
         // can seed new clusters and which can't
         prepareCluster(navigator, geometry_p);
      }

      // If some crystals in the current vector then 
      // make them into a cluster 
      if (current_v25.size() > 0) 
      {
        makeCluster(geometry_p, geometryES_p, seedId);
      }

   }  // End loop on seed crystals

}

void CosmicClusterAlgo::makeCluster(
                                    const CaloSubdetectorGeometry *geometry,
                                    const CaloSubdetectorGeometry *geometryES,
                                        DetId seedId)
{

   double energy = 0;
   double energySecond = 0.;//JHaupt 4-27-08 Added for the second crystal stream
   double energyMax = 0.;//JHaupt 4-27-08 Added for the max crystal stream
   double chi2   = 0;
   DetId detFir;
   DetId detSec;
   //bool goodCluster = false; //JHaupt 4-27-08 Added so that some can be earased.. used another day Might not be needed as seeds are energy ordered... 
   
   
   std::vector<DetId>::iterator it;
   for (it = current_v9.begin(); it != current_v9.end(); it++)
   {
     // Martina - check recoFlag for crystals sorrounding the good one 
     EcalRecHitCollection::const_iterator itt = recHits_->find(*it);
     // double-check that iterator can be dereferenced   
     if(itt==recHits_->end()) continue; 
     // if rechit affected by features other than these, do not allow 2 crystal seeding either
     // features are hard coded, for now; add severity?
     uint32_t rhFlag = (*itt).recoFlag();
     if (!(
           rhFlag == EcalRecHit::kGood      ||
           rhFlag == EcalRecHit::kOutOfTime ||
           rhFlag == EcalRecHit::kPoorCalib
           )
         ) continue;
     

      EcalUncalibratedRecHitCollection::const_iterator ittu = uncalibRecHits_->find(*it);
      EcalUncalibratedRecHit uhit_p = *ittu;
          
          if (uhit_p.amplitude() > energySecond ) {energySecond = uhit_p.amplitude(); detSec = uhit_p.id();}
          if (energySecond > energyMax ) {std::swap(energySecond,energyMax); std::swap(detFir,detSec);}
   }
   
   //if ((detFir.det() == DetId::Ecal) && (detFir.subdetId() == EcalEndcap)) inEB = false;
   //We ignore the possiblity that the cluster may span into the EE    

   if ((energyMax < (inEB ? ecalBarrelSingleThreshold : ecalEndcapSingleThreshold)) && (energySecond < (inEB ? ecalBarrelSecondThreshold : ecalEndcapSecondThreshold) )) return;
   
   for (it = current_v25.begin(); it != current_v25.end(); it++)
   {
      EcalRecHitCollection::const_iterator itt = recHits_->find(*it);
      EcalRecHit hit_p = *itt;
          
          EcalUncalibratedRecHitCollection::const_iterator ittu = uncalibRecHits_->find(*it);
      EcalUncalibratedRecHit uhit_p = *ittu;
          
      if ( uhit_p.amplitude() > ( inEB ? ecalBarrelSupThreshold : ecalEndcapSupThreshold)) 
      {  
         // energy fraction = 1
         current_v25Sup.push_back( std::pair<DetId, float>( hit_p.id(), 1.) );
         energy += hit_p.energy(); //Keep the fully corrected energy 
         chi2 += 0;
      }     
   }
   
   Point position;
   position = posCalculator_.Calculate_Location(current_v25Sup,recHits_, geometry, geometryES);
   
   chi2 /= energy;
   if (verbosity < pINFO)
   { 
      std::cout << "JH******** NEW CLUSTER ********" << std::endl;
      std::cout << "JHNo. of crystals = " << current_v25Sup.size() << std::endl;
      std::cout << "JH     Energy     = " << energy << std::endl;
      std::cout << "JH     Phi        = " << position.phi() << std::endl;
      std::cout << "JH     Eta        = " << position.eta() << std::endl;
      std::cout << "JH*****************************" << std::endl;
      // specialize this
//       std::cout << "JH****Emax****  "<<energyMax << " ieta " <<detFir.ieta() <<" iphi "<<detFir.ieta()  << std::endl;
//       std::cout << "JH****Esec****  "<<energySecond << " ieta " <<detSec.ieta() <<" iphi "<<detSec.ieta() << std::endl;
    }
   clusters_v.push_back(reco::BasicCluster(energy, position, reco::CaloID(), current_v25Sup, reco::CaloCluster::multi5x5, seedId));
}

bool CosmicClusterAlgo::checkMaxima(CaloNavigator<DetId> &navigator)
{

   bool maxima = true;
   EcalRecHitCollection::const_iterator thisHit;
   EcalRecHitCollection::const_iterator seedHit = recHits_->find(navigator.pos());
   double thisEnergy = 0.;
   double seedEnergy = seedHit->energy();

   std::vector<DetId> swissCrossVec;
   swissCrossVec.clear();

   swissCrossVec.push_back(navigator.west());
   navigator.home();
   swissCrossVec.push_back(navigator.east());
   navigator.home();
   swissCrossVec.push_back(navigator.north());
   navigator.home();
   swissCrossVec.push_back(navigator.south());
   navigator.home();

   std::vector<DetId>::const_iterator detItr;
   for (unsigned int i = 0; i < swissCrossVec.size(); ++i)
   {
      thisHit = recHits_->find(swissCrossVec[i]);
      if  ((swissCrossVec[i] == DetId(0)) || thisHit == recHits_->end()) thisEnergy = 0.0;
      else thisEnergy = thisHit->energy();
      if (thisEnergy > seedEnergy)
      {
         maxima = false;
         break;
      }
   }

   return maxima;

}

void CosmicClusterAlgo::prepareCluster(CaloNavigator<DetId> &navigator,  
                const CaloSubdetectorGeometry *geometry)
{

   DetId thisDet;
   std::set<DetId>::iterator setItr;

   // now add the 5x5 taking care to mark the edges
   // as able to seed and where overlapping in the central
   // region with crystals that were previously able to seed
   // change their status so they are not able to seed
   //std::cout << std::endl;
   for (int dx = -2; dx < 3; ++dx) //for (int dx = -2; dx < 3; ++dx)
   {
      for (int dy = -2; dy < 3; ++ dy) //for (int dy = -2; dy < 3; ++ dy)
      {

          // navigate in free steps forming
          // a full 5x5
          thisDet = navigator.offsetBy(dx, dy);
          navigator.home();

          // add the current crystal
          //std::cout << "adding " << dx << ", " << dy << std::endl;
         


          // now consider if we are in an edge (outer 16)
          // or central (inner 9) region
          if ((abs(dx) > 1) || (abs(dy) > 1))
          {    
             // this is an "edge" so should be allowed to seed
             // provided it is not already used
             //std::cout << "   setting can seed" << std::endl;
                         addCrystal(thisDet,false); //These are in the V25
             canSeed_s.insert(thisDet);
          }  // end if "edge"
          else 
          {
             // or else we are in the central 3x3
             // and must remove any of these crystals from the canSeed set
             setItr = canSeed_s.find(thisDet);
                         addCrystal(thisDet,true); //These are in the V9
             if (setItr != canSeed_s.end())
             {
                //std::cout << "   unsetting can seed" << std::endl;
                canSeed_s.erase(setItr);
             }
          }  // end if "centre"


      } // end loop on dy

   } // end loop on dx

   //std::cout << "*** " << std::endl;
   //std::cout << " current_v contains " << current_v.size() << std::endl;
   //std::cout << "*** " << std::endl;
}


void CosmicClusterAlgo::addCrystal(const DetId &det, const bool in9)
{   
    
    EcalRecHitCollection::const_iterator thisIt =  recHits_->find(det);
    if ((thisIt != recHits_->end()) && (thisIt->id() != DetId(0)))
    { 
        if ((used_s.find(thisIt->id()) == used_s.end())) 
        {
                    EcalUncalibratedRecHitCollection::const_iterator thisItu =  uncalibRecHits_->find(det);
            used_s.insert(det);
            if ((thisIt->energy() >= -1.) && !(thisItu->chi2() < -1.))
            {           
               if (in9)  current_v9.push_back(det);
                   current_v25.push_back(det);
            }
            
        }
    } 
   
}