//----------------------------------------------------------
//
// Description:
// Class mapping positions (x,y,z) to set of dch data 
// (like chamber, plane, wire, distance form wire)
// and vice versa
//
//----------------------------------------------------------


#ifndef PNDDCHMAPPER_HH
#define PNDDCHMAPPER_HH 

#include "TObject.h"
#include <vector>

class PndDchPoint;
class PndDchStructure;

class PndDchMapper : public TObject  {
  
 public:
  
  static PndDchMapper* Instance();
  ~PndDchMapper();
  
  static Int_t CalculateDetectorID(Int_t ch, Int_t pl) { return fOffset*ch+pl;}
  static Int_t CalculatePlane(Int_t detID) { return detID%fOffset;}
  static Int_t CalculateChamber(Int_t detID) { return detID/fOffset;}
  Int_t        WhichWire(Int_t detID, Double_t xLocal ) const;
  Int_t        GetFiredWires(std::vector<Int_t> &wireID,
			     std::vector<Double_t> &distance,
			     const PndDchPoint* point) const;
  Bool_t       TransformToLocal(Double_t* localPosition, 
				Double_t* localMomentum, 
				const PndDchPoint* point) const;
  void         Print(const Option_t*) const;
  
 protected:
  PndDchMapper();
  static const Int_t fOffset = 1000;

 private:
  // interface to geo data
  PndDchStructure *fDchStructure;
  static PndDchMapper* fMapperInstance;
  
  ClassDef(PndDchMapper,1);

};

#endif