#ifndef AliHMPIDHit_h
#define AliHMPIDHit_h
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

#include <AliHit.h>           //base class
#include <TVector3.h>         //ctor
#include <TRandom.h>          //QdcTot()
#include <TMath.h>

class AliHMPIDHit : public AliHit //   TObject-AliHit-AliHMPIDHit
{
public:
  AliHMPIDHit(                                                                         ):AliHit(    ),fCh(-1),fPid(-1),fQ(-1),fLx(0),fLy(0){} //default ctor
  AliHMPIDHit(Int_t c,Float_t e,Int_t id,Int_t tn,Float_t x,Float_t y,const TVector3 &p):AliHit(0,tn),fCh(c ),fPid(id),fQ(-1),fLx(x),fLy(y){QdcTot(e);fX=p.X();fY=p.Y();fZ=p.Z();}
  AliHMPIDHit(Int_t c,Float_t e,Int_t id,Int_t tn,Float_t x,Float_t y                  ):             fCh(c ),fPid(id),fQ(-1),fLx(x),fLy(y){QdcTot(e);fTrack=tn;}//manual ctor 
  virtual ~AliHMPIDHit()                                                                                                                                 {}
//framework part
         void    Print(Option_t *opt="")const;                                                 //from TObject to print current status
         void    Draw (Option_t *opt="");                                                      //from TObject to Draw this hit in current canvas
//private part  
         Int_t   Ch    (         )const{return fCh;                                    }       //Chamber
         //clm: hit LorsX and Y were changed for simulation hits
         Float_t LorsX (         )const{return fLx;                                    }       //hit X position in LORS, [cm]
         Float_t LorsY (         )const{return fLy;                                    }       //hit Y position in LORS, [cm]
         Int_t   Pid   (         )const{return fPid;                                   }       //PID
         Float_t Q     (         )const{return fQ;                                     }       //Eloss for MIP hit or Etot for photon hit, [GeV]
  inline Float_t QdcTot(Float_t e);                                                            //calculate total charge of the hit          
         Int_t   Tid   (         )const{return fTrack;                                 }       //TID
         
protected:                                                                     //AliHit has fTid,fX,fY,fZ 
  Int_t    fCh;                                                                //Chamber
  Int_t    fPid;                                                               //PID
  Float_t  fQ;                                                                 //total charge [QDC]
  Float_t  fLx;                                                                //hit X position in chamber LORS, [cm]
  Float_t  fLy;                                                                //hit Y position in chamber LORS, [cm]
  ClassDef(AliHMPIDHit,5)                                                      //HMPID hit class 
};//class AliHMPIDhit
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++  
Float_t AliHMPIDHit::QdcTot(Float_t e)
{
// Samples total charge of the hit
// Arguments: e- hit energy [GeV]; for mip Eloss for photon Etot   
//   Returns: total QDC
  Float_t  x=(LorsX() > 66.6)? LorsX()-66.6:LorsX();                                                 //sagita is for PC (0-64) and not for chamber   
  Float_t  qdcEle=34.06311+0.2337070*x+5.807476e-3*x*x-2.956471e-04*x*x*x+2.310001e-06*x*x*x*x;      //reparametrised from DiMauro
  
  Int_t iNele=Int_t(e/26e-9);  if(iNele<1) iNele=1;                                                  //number of electrons created by hit
  for(Int_t i=1;i<=iNele;i++) fQ-=qdcEle*TMath::Log(gRandom->Rndm()+1e-6);                           //1e-6 is a protection against 0 from rndm  
  return fQ;
}  
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    
typedef AliHMPIDHit AliRICHHit; // for backward compatibility
    
#endif