/** @file CbmMCEventInfo.h
 ** @author Volker Friese <v.friese@gsi.de>
 ** @date 16.06.2018
 **/

#ifndef CBMMCEVENTINFO_H
#define CBMMCEVENTINFO_H 1

#include <string>
#include "Rtypes.h"


/** @class CbmMCEventInfo
 ** @brief Allows to access an MC event in the source file
 ** @author Volker Friese <v.friese@gsi.de>
 ** @date 16.06.2018
 **
 ** During digitization, an event time is generated for each input MC event
 ** obtained from transport simulations. This event time is stored in this
 ** class and saved to the output (raw) tree using the container CbmMCEventList.
 ** File number and event number allow to access the input MC event in its
 ** respective file, using CbmMCDataManager. The MC event time can be used
 ** for QA of reconstructed data, i.e., comparing the time of the
 ** reconstructed event with the MC truth time.
 **/
class CbmMCEventInfo
{

  public:

    /** @brief Constructor
     ** @param fileId   Input file index
     ** @param eventId  MC event index (entry in ROOT tree)
     ** @param time     Event start time [ns]
     **/
    CbmMCEventInfo(Int_t fileId = -1,
                   Int_t eventId = -1,
                   Double_t time = 0.);


    /** @brief Destructor **/
    virtual ~CbmMCEventInfo();


    /** @brief File index
     ** @value File index
     **/
    Int_t GetFileId() const { return fFileId; }


    /** @brief Event index
     ** @value Event index
     **/
    Int_t GetEventId() const { return fEventId; }


    /** @brief Event time
     ** @value Event time [ns]
     **/
    Double_t GetTime() const { return fTime; }


    /** Status to string **/
    std::string ToString() const;


    /** @brief Comparison operator **/
    bool operator<(const CbmMCEventInfo& other) const {
      if ( fFileId == other.fFileId ) return ( fEventId < other.fEventId );
      return ( fFileId < other.fFileId );
    }


  private:

    Int_t fFileId;
    Int_t fEventId;
    Double_t fTime;

    ClassDef(CbmMCEventInfo, 1);
};



#endif /* CBMMCEVENTINFO_H_ */