#ifndef _SMEARUTIL_H_
#define _SMEARUTIL_H_

/*
  ---- Delphes ----
  A Fast Simulator for general purpose LHC detector
  S. Ovyn ~~~~ severine.ovyn@uclouvain.be
  
  Center for Particle Physics and Phenomenology (CP3)
  Universite Catholique de Louvain (UCL)
  Louvain-la-Neuve, Belgium
*/

/// \file SmearUtil.h
/// \brief RESOLution class, and some generic definitions


#include <vector>
#include "TLorentzVector.h"

#include "Utilities/ExRootAnalysis/interface/BlockClasses.h"
#include "Utilities/ExRootAnalysis/interface/TSimpleArray.h"

#include "Utilities/Fastjet/plugins/CDFCones/interface/PhysicsTower.hh"
using namespace std;

class RESOLution
{
 public:
  /// Constructor
  RESOLution();
  
  // Detector coverage
  float MAX_TRACKER;    // tracker pseudorapidity coverage
  float MAX_CALO_CEN;   // central calorimeter pseudorapidity coverage
  float MAX_CALO_FWD;   // forward calorimeter pseudorapidity coverage
  float MAX_MU;         // muon chambers pseudorapidity coverage
  float MIN_CALO_VFWD;  // very forward calorimeter pseudorapidity coverage
  float MAX_CALO_VFWD;  // very forward calorimeter pseudorapidity coverage
  float MIN_ZDC;        // coverage for Zero Degree Calorimeter, for photons and neutrons

  float ZDC_S;   // distance of the Zero Degree Calorimeter, from the Interaction poin, in [m]
  float RP220_S; // distance of the RP to the IP, in meters
  float RP220_X; // distance of the RP to the beam, in meters
  float FP420_S; // distance of the RP to the IP, in meters
  float FP420_X; // distance of the RP to the beam, in meters

  //Magnetic Field information
  int TRACKING_RADIUS;                      //radius of the BField coverage
  int TRACKING_LENGTH;                      //length of the BField coverage
  float BFIELD_X;          
  float BFIELD_Y;          
  float BFIELD_Z;         

  
  //energy resolution for electron/photon
  // \sigma/E = C + N/E + S/\sqrt{E}
  float ELG_Scen;   // S term for central ECAL
  float ELG_Ncen;   // N term for central ECAL
  float ELG_Ccen;   // C term for central ECAL
  float ELG_Sfwd;   // S term for forward ECAL
  float ELG_Cfwd;   // C term for forward ECAL
  float ELG_Nfwd;   // N term for central ECAL
  
  //energy resolution for hadrons in ecal/hcal/hf
  // \sigma/E = C + N/E + S/\sqrt{E}
  float HAD_Shcal;   // S term for central HCAL // hadronic calorimeter
  float HAD_Nhcal;   // N term for central HCAL
  float HAD_Chcal;   // C term for central HCAL
  float HAD_Shf;     // S term for central HF // forward calorimeter
  float HAD_Nhf;     // N term for central HF
  float HAD_Chf;     // C term for central HF
  
  // muon smearing
  float MU_SmearPt;
 
  //threshold for reconstructed objetcs
  float ELEC_pt;
  float MUON_pt;
  float JET_pt;
  float TAUJET_pt;
 
  //For Tau-jet definition
  // R = sqrt (phi^2 + eta^2)
  float TAU_CONE_ENERGY;  // radius R of the cone for tau definition, based on energy threshold
  float TAU_CONE_TRACKS;  // radius R of the cone for tau definition, based on track number
  float PT_TRACK_TAU;     // minimal pt [GeV] for tracks to be considered in tau definition
  float TAU_EM_COLLIMATION; // fraction of energy required in the central part of the cone, for tau jets
  
  // Tracker acceptance
  float PT_TRACKS_MIN;    // minimal pt needed to reach the calorimeter, in GeV
  float PT_QUARKS_MIN;    // minimal pt needed for quarks to reach the tracker, in GeV
  int TRACKING_EFF;       // in percent, should be an integer
  
  //tagging definition
  int TAGGING_B;         //
  int MISTAGGING_C; 
  int MISTAGGING_L; 
  
  double CONERADIUS;
  int JETALGO;

  //General jet variable
  double SEEDTHRESHOLD;    
  double OVERLAPTHRESHOLD; 

  // MidPoint algorithm definition
  double M_CONEAREAFRACTION; 
  int    M_MAXPAIRSIZE;      
  int    M_MAXITERATIONS;    
 
  // Define Cone algorithm.
  int    C_ADJACENCYCUT;
  int    C_MAXITERATIONS;
  int    C_IRATCH;

  //Define SISCone algorithm.
  int NPASS;
  double PROTOJET_PTMIN;

  // Define Calorimetric towers
  unsigned int NTOWERS;
  float * TOWER_ETA_EDGES;
  float * TOWER_DPHI; 


  /// Reads the data card for the initialisation of the parameters 
  void ReadDataCard(const string datacard);
 
  /// Create the output log file
  void Logfile(string LogName);
  
  /// Provides the smeared TLorentzVector for the electrons
  void SmearElectron(TLorentzVector &electron);
  
  /// Provides the smeared TLorentzVector for the muons
  void SmearMu(TLorentzVector &muon);
  
  /// Provides the smeared TLorentzVector for the hadrons
  void SmearHadron(TLorentzVector &hadron, const float frac);
  
  //*****************************fonction pour avoir les taus************************************
  double EnergySmallCone(const vector<PhysicsTower> &towers, const float eta, const float phi);

  //***************** Fonction pour avoir le nombre de traces pour les taus****************************
  unsigned int NumTracks(const vector<TLorentzVector> &tracks, const float pt_track, const float eta, const float phi);

  //**********************fonction pour avoir les b-jets******************************
  int Bjets(const TSimpleArray<TRootGenParticle> &subarray, const float eta, const float phi);
  
  //******************** retourne l'efficacite de b-tagging ******************************
  bool Btaggedjet(const TLorentzVector &JET, const TSimpleArray<TRootGenParticle> &subarray);

  //******************************isolation criteria**************************************
  bool Isolation(Float_t phi,Float_t eta,const vector<TLorentzVector> &tracks,float PT_TRACK2);

  //********************* returns a segmented value for eta and phi, for calo towers *****
  void BinEtaPhi(const float phi, const float eta, float& iPhi, float& iEta);

};


// particles PID (PDG ID)
const int pU   = 1;    // c quark
const int pD   = 2;    // b quark
const int pS   = 3;    // s quark
const int pC   = 4;    // c quark
const int pB   = 5;    // b quark
const int pE   = 11;   // e
const int pNU1 = 12;   // nu_e
const int pMU  = 13;   // mu
const int pNU2 = 14;   // nu_mu
const int pTAU = 15;   // tau
const int pNU3 = 16;   // nu_tau
const int pGLUON = 21; // gluon
const int pGAMMA = 22; // gamma
const int pW   = 24;   // W
const int pP   = 2212; // proton
const int pN   = 2112; // neutron
const int pPI0 = 111;  // pi_0
const int pK0L = 130;  // K^0_L
const int pK0S = 310;  // K^0_S
const int pLAMBDA = 3122; // Lambda
const int pSIGMA0 = 3212;  // Sigma^0
const int pDELTA0 = 2114;  // Delta^0

const double speed_of_light = 299792458; // m/s

#ifndef __PI__
#define __PI__
const double PI = acos(-1.0);
#endif

// ** returns the sign (+1 or -1) or an integer
int sign(const int myint);
int sign(const float myfloat);

// **************************** Return the Delta Phi****************************
float DeltaPhi(const float phi1, const float phi2);

// **************************** Returns the Delta R****************************
float DeltaR(const float phi1, const float eta1, const float phi2, const float eta2);

//************* Returns an array of the quarks sitting within the tracker acceptance ***************
int Charge(int pid);

#endif