////////////////////////////////////////////////////////////////////////
/// \class RAT::Classifiers::XSite
///
/// \brief  Calculates the XSite for an event
///
/// \author name Yang Zhang <yzhang23@ualberta.ca>
///
/// REVISION HISTORY:\n
///     07/27/2019 : Yang Zhang - First version
///
/// \details Gives the XSite for an event, that is, the likelihood ratio of
////   PMT hit time residuals that fall within the selected window between S/B
///    default S/B is 0nv and Co60 in Te_load phase.
///
////////////////////////////////////////////////////////////////////////

#ifndef __RAT_Classifiers_XSite_
#define __RAT_Classifiers_XSite_

#include <RAT/SeededClassifier.hh>
#include <RAT/SelectorClassifier.hh>
#include <RAT/DU/LightPathCalculator.hh>
#include <RAT/DS/FitResult.hh>

namespace RAT
{
  namespace DS
  {
    class FitResult;
  }

  namespace Classifiers
  {

    class XSite : public SeededClassifier, public SelectorClassifier
    {
    public:
      virtual std::string GetName() const  { return XSite::Name(); }

      static std::string Name() { return std::string( "XSite" ); }

      void Initialise( const std::string& );

      void BeginOfRun(DS::Run& run);

      void EndOfRun(DS::Run&) { }

      virtual DS::ClassifierResult GetClassification();
      /// Set the seed to default
      void DefaultSeed();
      /// Set the seed from seed
      void SetSeed( const DS::FitResult& seed );

    private:
      std::string fIndex; ///< Optional database index
      TVector3 fEventPos;
      double fEventTime;
      double fUpperTimeLimit;
      double fLowerTimeLimit;
      std::vector<double> fSignal ;
      std::vector<double> fBKG ;
      DU::LightPathCalculator fLightPath; ///< Light path calculator for a given run
      DS::FitVertex fSeedVertex;

    };

  } //::Classifier

} //::RAT

#endif