/**
 * \file CbmTrd.h
 * \author V.Friese <v.friese@gsi.de>
 * \date 27.07.2004
 * \brief Defines the active detector TRD. Constructs the geometry and registers MCPoints.
 **/

#ifndef CBMTRD_H_
#define CBMTRD_H_

#include "FairDetector.h"
#include "TLorentzVector.h"
#include "TVector3.h"
#include <string>

class CbmTrdPoint; 
class CbmTrdGeoHandler;
class FairVolume;
class TClonesArray;

using std::string;

/**
 * \class CbmTrd
 * \author V.Friese <v.friese@gsi.de>
 * \date 27.07.2004
 * \brief Defines the active detector TRD. Constructs the geometry and registers MCPoints.
 **/
class CbmTrd : public FairDetector 
{
public:

   /**
    * \brief Default constructor.
    **/
   CbmTrd();

   /**
    * \brief Standard constructor.
    * \param name Detector name.
    * \param active Sensitivity flag
   **/
   CbmTrd(const char* name, Bool_t active);

   /**
    * \brief Destructor.
    **/
   virtual ~CbmTrd();

   /**
    * \brief Defines the action to be taken when a step is inside the active volume.
    * Creates CbmTrdPoints and adds them to the collection.
    * \param vol Pointer to the active volume.
    **/
   virtual Bool_t ProcessHits(FairVolume* vol = NULL);

   /**
    * \brief If verbosity level is set, print hit collection at the end of the event and resets it afterwards.
    **/
   virtual void EndOfEvent();

   /**
    * \brief Registers the hit collection in the ROOT manager.
    */
   virtual void  Register();

   /**
    * \brief Accessor to the hit collection.
    **/
   virtual TClonesArray* GetCollection(Int_t iColl) const;

   /**
    * \brief Screen output of hit collection.
    **/
   virtual void Print() const;

   /**
    * \brief Clears the hit collection.
    **/
   virtual void Reset();

   /**
    * \brief Copies the hit collection with a given track index offset.
    * \param cl1 Origin.
    * \param cl2 Target.
    * \param offset Index offset.
    **/
   virtual void CopyClones(TClonesArray* cl1, TClonesArray* cl2, Int_t offset);

   /**
    * \brief Constructs the TRD geometry.
    **/
   virtual void ConstructGeometry();

   /**
    * \brief Constructs the TRD geometry from ASCII file.
    **/
   virtual void ConstructAsciiGeometry();

   Bool_t CheckIfSensitive(string name);

private:

   /** Track information to be stored until the track leaves the
   active volume. **/
   TLorentzVector fPosIn;             //! position at entrance
   TLorentzVector fMomIn;             //! momentum at entrance
   TLorentzVector fPosOut;            //! position at exit
   TLorentzVector fMomOut;            //! momentum at exit
   Double32_t     fTime;              //! time
   Double32_t     fLength;            //! length
   Double32_t     fELoss;             //! energy loss
   Int_t          fPosIndex;          //! position index

   TClonesArray* fTrdPoints; //! MC point collection
   CbmTrdGeoHandler* fGeoHandler; //! Interface to gMC and gGeoManager

   /**
    * \brief Resets the private members for the track parameters.
    **/
   void ResetParameters();
   virtual void Initialize();
   virtual void SetSpecialPhysicsCuts();

   CbmTrd(const CbmTrd&);
   CbmTrd operator=(const CbmTrd&);

   ClassDef(CbmTrd, 7);
};


inline void CbmTrd::ResetParameters() {
  fPosIn.SetXYZM(0.0, 0.0, 0.0, 0.0);
  fMomIn.SetXYZM(0.0, 0.0, 0.0, 0.0);
  fPosOut.SetXYZM(0.0, 0.0, 0.0, 0.0);
  fMomOut.SetXYZM(0.0, 0.0, 0.0, 0.0);
  fTime = fLength = fELoss = 0;
  fPosIndex = 0;
};

#endif