/data/refman/pasoursint/CMSSW_5_3_10/src/Calibration/HcalCalibAlgos/interface/CommonUsefulStuff.h

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#ifndef CommonUsefulStuff_h
#define CommonUsefulStuff_h

// $Id: CommonUsefulStuff.h,v 1.3 2010/03/16 23:25:48 andrey Exp $

#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/HcalDetId/interface/HcalDetId.h"
#include "DataFormats/EcalDetId/interface/EEDetId.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/Records/interface/CaloGeometryRecord.h"

#include "DataFormats/HcalRecHit/interface/HcalRecHitCollections.h"
#include "DataFormats/EcalRecHit/interface/EcalRecHitCollections.h"

#include "FWCore/Utilities/interface/Exception.h"

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"

#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CommonTools/UtilAlgos/interface/DeltaR.h"
#include "CommonTools/UtilAlgos/interface/TFileService.h"

#include "TROOT.h"
#include "TFile.h"
#include "TTree.h"
#include "TH1F.h"
#include "TString.h"

/* getDist functions by Jim:
/uscms/home/jhirsch/IsoTracks_314/CMSSW_3_1_4/src/JetMETCorrections/IsolatedParticles/interface/FindCaloHit.icc
*/


struct MaxHit_struct
{
  int iphihitm;
  int ietahitm;
  int depthhit;
  float hitenergy;
  float dr;
  GlobalPoint posMax;
  MaxHit_struct():iphihitm(0),ietahitm(0),
                  depthhit(0),hitenergy(-100),dr(0){}
};


inline double getDistInPlaneSimple(const GlobalPoint caloPoint,
                            const GlobalPoint rechitPoint)
{

  // Simplified version of getDistInPlane
  // Assume track direction is origin -> point of hcal intersection

  const GlobalVector caloIntersectVector(caloPoint.x(),
                                         caloPoint.y(),
                                         caloPoint.z());

  const GlobalVector caloIntersectUnitVector = caloIntersectVector.unit();

  const GlobalVector rechitVector(rechitPoint.x(),
                                  rechitPoint.y(),
                                  rechitPoint.z());

  const GlobalVector rechitUnitVector = rechitVector.unit();
  double dotprod = caloIntersectUnitVector.dot(rechitUnitVector);
  double rechitdist = caloIntersectVector.mag()/dotprod;


  const GlobalVector effectiveRechitVector = rechitdist*rechitUnitVector;
  const GlobalPoint effectiveRechitPoint(effectiveRechitVector.x(),
                                         effectiveRechitVector.y(),
                                         effectiveRechitVector.z());


  GlobalVector distance_vector = effectiveRechitPoint-caloPoint;

  if (dotprod > 0.)
  {
    return distance_vector.mag();
  }
  else
  {
    return 999999.;

  }

}

inline double getDistInPlaneTrackDir(const GlobalPoint  caloPoint,
                              const GlobalVector caloVector,
                              const GlobalPoint  rechitPoint)
{

  // Simplified version of getDistInPlane : no cone "within" Hcal, but
  // don't assume track direction is origin -> point of hcal
  // intersection.
  const GlobalVector caloIntersectVector(caloPoint.x(),
                                         caloPoint.y(),
                                         caloPoint.z()); //p

  const GlobalVector caloUnitVector = caloVector.unit();
  const GlobalVector rechitVector(rechitPoint.x(),
                                  rechitPoint.y(),
                                  rechitPoint.z());
  const GlobalVector rechitUnitVector = rechitVector.unit();
  double dotprod_denominator = caloUnitVector.dot(rechitUnitVector);
  double dotprod_numerator   = caloUnitVector.dot(caloIntersectVector);
  double rechitdist = dotprod_numerator/dotprod_denominator;
  const GlobalVector effectiveRechitVector = rechitdist*rechitUnitVector;
  const GlobalPoint effectiveRechitPoint(effectiveRechitVector.x(),
                                         effectiveRechitVector.y(),
                                         effectiveRechitVector.z());
  GlobalVector distance_vector = effectiveRechitPoint-caloPoint;
  if (dotprod_denominator > 0. && dotprod_numerator > 0.)
  {

    return distance_vector.mag();
  }
  else
  {
    return 999999.;
  }
}



inline double getDistInPlane(const GlobalVector trackDirection,
                      const GlobalPoint caloPoint,
                      const GlobalPoint rechitPoint,
                      double coneHeight)
{

  // The iso track candidate hits the Calo (Ecal or Hcal) at "caloPoint"
  // with direction "trackDirection".

  // "rechitPoint" is the position of the rechit.  We only care about
  // the direction of the rechit.

  // Consider the rechitPoint as characterized by angles theta and phi
  // wrt the origin which points at the calo cell of the rechit.  In
  // some sense the distance along the line theta/phi is arbitrary. A
  // simplified choice might be to put the rechit at the surface of
  // the Hcal.  Our approach is to see whether/where this line
  // intersects a cone of height "coneHeight" with vertex at caloPoint
  // aligned with trackDirection.
 // To that end, this function returns the distance between the
  // center of the base of the cone and the intersection of the rechit
  // line and the plane that contains the base of the cone.  This
  // distance is compared with the radius of the cone outside this
  // function.


  // Make vector of length cone height along track direction
  const GlobalVector heightVector = trackDirection*coneHeight;

  // Make vector from origin to point where iso track intersects the
  // calorimeter.
  const GlobalVector caloIntersectVector(caloPoint.x(),
                                         caloPoint.y(),
                                         caloPoint.z());

  // Make vector from origin to point in center of base of cone
  const GlobalVector coneBaseVector = heightVector+caloIntersectVector;

// Make point in center of base of cone
  const GlobalPoint coneBasePoint(coneBaseVector.x(),
                                  coneBaseVector.y(),
                                  coneBaseVector.z());

  // Make unit vector pointing at rechit.
  const GlobalVector rechitVector(rechitPoint.x(),
                                  rechitPoint.y(),
                                  rechitPoint.z());
  const GlobalVector rechitDirection = rechitVector.unit();

  // Find distance "r" along "rechit line" (with angles theta2 and
  // phi2) where line intersects plane defined by base of cone.

  // Definition plane of that contains base of cone:
  // trackDirection.x() (x - coneBaseVector.x()) +
  // trackDirection.y() (y - coneBaseVector.y()) +
  // trackDirection.z() (z - coneBaseVector.z()) = 0

  // Point P_{rh} where rechit line intersects plane:
  // (rechitdist sin(theta2) cos(phi2),
  //  rechitdist sin(theta2) cos(phi2),
  //  rechitdist cos(theta2))

  // Substitute P_{rh} into equation for plane and solve for rechitdist.
  // rechitDist turns out to be the ratio of dot products:

  double rechitdist = trackDirection.dot(coneBaseVector)/trackDirection.dot(rechitDirection);

  // Now find distance between point at center of cone base and point
  // where the "rechit line" intersects the plane defined by the base
  // of the cone; i.e. the effectiveRecHitPoint.
  const GlobalVector effectiveRechitVector = rechitdist*rechitDirection;
  const GlobalPoint effectiveRechitPoint(effectiveRechitVector.x(),
                                         effectiveRechitVector.y(),
                                         effectiveRechitVector.z());


  GlobalVector distance_vector = effectiveRechitPoint-coneBasePoint;
  return distance_vector.mag();
}


/*  Function to calculate Ecal Energy in Cone (given in cm) */
inline double ecalEnergyInCone(const GlobalPoint center, double radius, const EcalRecHitCollection ecalCol, const CaloGeometry *geo)
{
  double eECALcone = 0;
  std::vector<int> usedHitsEcal; 
  usedHitsEcal.clear();
  
  for (std::vector<EcalRecHit>::const_iterator ehit=ecalCol.begin(); ehit!=ecalCol.end(); ehit++)
    {
      //This is a precaution for the case when hitCollection contains duplicats.
      bool hitIsUsed=false;
      int hitHashedIndex=-10000;
      if (ehit->id().subdetId()==EcalBarrel)
        {
          EBDetId did(ehit->id());
          hitHashedIndex=did.hashedIndex();
        }
      if (ehit->id().subdetId()==EcalEndcap)
        {
          EEDetId did(ehit->id());
          hitHashedIndex=did.hashedIndex();
        }
      for (uint32_t i=0; i<usedHitsEcal.size(); i++)
        {
          if (usedHitsEcal[i]==hitHashedIndex) hitIsUsed=true;
        }
      if (hitIsUsed) continue;
      usedHitsEcal.push_back(hitHashedIndex);
      // -----------------------------------------------
      
      GlobalPoint pos = geo->getPosition((*ehit).detid());
  
      if (getDistInPlaneSimple(center,pos) < radius)
        {
          eECALcone += ehit->energy();
        }
    }
  return eECALcone;
}

/*  This is another version of ecalEnergy calculation using the getDistInPlaneTrackDir()  */
inline double ecalEnergyInCone(const GlobalVector trackMom, const GlobalPoint center, double radius, const EcalRecHitCollection ecalCol, const CaloGeometry *geo)
{
  
  double eECALcone = 0;
  std::vector<int> usedHitsEcal; 
  usedHitsEcal.clear();
  for (std::vector<EcalRecHit>::const_iterator ehit=ecalCol.begin(); ehit!=ecalCol.end(); ehit++)
    {
      //This is a precaution for the case when hitCollection contains duplicats.
      bool hitIsUsed=false;
      int hitHashedIndex=-10000;
      if (ehit->id().subdetId()==EcalBarrel)
        {
          EBDetId did(ehit->id());
          hitHashedIndex=did.hashedIndex();
        }
      if (ehit->id().subdetId()==EcalEndcap)
        {
          EEDetId did(ehit->id());
          hitHashedIndex=did.hashedIndex();
        }
      for (uint32_t i=0; i<usedHitsEcal.size(); i++)
        {
          if (usedHitsEcal[i]==hitHashedIndex) hitIsUsed=true;
        }
      if (hitIsUsed) continue;
      usedHitsEcal.push_back(hitHashedIndex);
      // -----------------------------------------------

      GlobalPoint pos = geo->getPosition((*ehit).detid());
  
      if (getDistInPlaneTrackDir(center, trackMom ,pos) < radius)
        {
          eECALcone += ehit->energy();
        }
      }
  return eECALcone;
}



#endif