#ifndef TScintBarGeom_hxx_seen
#define TScintBarGeom_hxx_seen

#include <vector>
#include <map>

#include <TVector3.h>
#include <TGeoMaterial.h>
#include <HEPUnits.hxx>

#include "EoaGeomInfo.hxx"

#include "IGeometryId.hxx"

namespace COMET {
    class IScintBarGeom;
};

/// A class for the T2K scintillator-based detectors. It contains 
/// all the basic geometry informations about a scintillator bar 
/// that needs to be passed to the electronics simulation and the 
/// higher level reconstruction algorithms.
/// to create a bar object the user need to specify the nodeId, 
/// the orientation of the bar in the layer (X,Y) and which end 
/// has a sensor  
class COMET::IScintBarGeom {

public:

  typedef std::vector<COMET::IGeometryId> Neighbors;

  /// Create a new IScintBarGeom object.  The new IScintBarGeom object is
  /// created for the geometry node, the orientation (0 is X, 1 is Y), and the
  /// number of photosensors that are attached.
  IScintBarGeom(COMET::IGeometryId geomId, int orientation, int nsensors);
  virtual ~IScintBarGeom();
  
  /// Get the geometry node number for the bar.
  COMET::IGeometryId GetGeomId() const {return fGeomId;}

  /// Get the number of readout sensor for the bar  
  int GetNumOfSensors() const {return fSensorNumber;}

  /// Get the orientation of the bar as specified in the layer name 
  /// in the path (ex: FGDScintX is an "X" bar) orientation= 0 
  /// along Y : orientation = 1
  /// 
  int GetOrientation() const {return fBarOrientation;}

  /// Get the pointing direction of the bar (P0D bars).
  const TVector3& GetPointing() const {return fPointing;}
  TVector3& GetPointing() {return fPointing;}

  /// Get the vector of node id's for each of the neighbors.  There will
  /// be between two and eight neighbors for any given bar (depending on
  /// the local geometry).  The list is not in any particular order.
  const Neighbors& GetNeighbors(void) const {return fNeighbors;}
  Neighbors& GetNeighbors(void) {return fNeighbors;};

  /// Get bar dimensions in the local reference system : 
  /// thickness along Y, width along X and length along Z. 
  TVector3 GetBarDimensions();

  ///  Get bar material
  TGeoMaterial* GetMaterial();

private:

  //int fNodeId;
  COMET::IGeometryId fGeomId;

  /// Orientation of the bar in the module
  Int_t fBarOrientation;

  /// Number of sensor on the bar, choice is :
  ///  -1 : one sensor on minus side
  ///   1 : one sensor on plus side
  ///   2 : sensor on both ends 
  Int_t fSensorNumber;
  
protected:

  /// the list of neighbors for this bar.
  Neighbors fNeighbors;

  /// The direction that the triangle is pointing (the direction of the
  /// tip).
  TVector3 fPointing;
  
};
#endif