///////////////////////////////////////////////////////////////////////////////
/// \class RAT::DU::ReactorNuOsc
///
/// Processor for applying the neutrino oscillatinos effect to reactor
/// antineutrinos.
///
/// Author: Stefan-Alexandru Nae <stefan@lip.pt>
///         Ian Coulter <icoulter@hep.upenn.edu>
///
/// REVISION HISTORY:
///     2017-12-04 : I Coulter - Initial commit based on Stefan's processor
///
/// ReactorNuOsc is evaluates if an antineutrino should have oscillated.
/// If the antineutrino oscillated, it returns OKFALSE, else it returns OKTRUE.
///
/// Requires reactor entries in REACTORS.ratdb to have a "distance"
/// entry (label) with values for each core in [km]. "index" entries
/// (labels) with values corresponding to reactors found in the .root
/// reactor antineutrino events file used as input MUST exist (the
/// detabase will throw an error in case the reactor does not exist).


///////////////////////////////////////////////////////////////////////////////
#ifndef __RAT_DU_ReactorNuOsc__
#define __RAT_DU_ReactorNuOsc__

#include <RAT/DB.hh>
#include <TObject.h>

namespace RAT
{
namespace DU
{

class ReactorNuOsc: public TObject
{
public:
  ReactorNuOsc() : TObject() { }

  /// Intialise the class, sets up the bit maps
  void BeginOfRun();

  /// Select whether an anti-nu has oscillated given
  /// its energy and source reactor
  ///
  /// @param[in] kinetic energy of neutrino
  ///            name of reactor
  /// @return oscillation state of neutrino
  bool ReactorOsc( const double nuKE, std::string coreData );

  /// Determine probability of oscillation given the
  /// kinetic energy and baseline and set it in fOscProb
  ///
  /// @param[in] kinetic energy of neutrino
  ///            baseline
  void OscProbability(const double &energy, const double &baseline);

  /// Return whether the neutrino has oscillated given
  /// the probability in fOscProb
  ///
  /// @return oscillation state of the neutrino
  bool Sample();

protected:
  DBLinkPtr fLink;                    // for REACTORS.ratdb access
                                      // for OSCILLATIONS.ratdb access
  std::vector<double> fLatitude;      //
  std::vector<double> fLongitute;     //
  std::vector<double> fAltitude;      //
  double fOscProb;                    // OscProbability() value
  double fDm21Sqr;                    // oscillation parameter
  double fSSqrTheta12;                // oscillation parameter
  double fSSqrTheta13;                // oscillation parameter
  double fSSqr2Theta12;
  double fS4;
  double fC4;
};

} // ::DU

} // namespace RAT

#endif