/**
 * \file CbmTrdGeoHandler.h
 * \brief Helper class to extract information from the GeoManager.
 * \author Florian Uhlig <f.uhlig@gsi.de>
 * \date 13/08/2010
 *
 * Updated 20/05/2013 by Andrey Lebedev <andrey.lebedev@gsi.de>
 *
 * Helper class to extract information from the GeoManager which is
 * needed in many other TRD classes. This helper class should be a
 * single place to hold all these functions.
 */

#ifndef CBMTRDGEOHANDLER_H_
#define CBMTRDGEOHANDLER_H_ 1

#include "TObject.h"

class TGeoBBox;
class TGeoVolume;
class TGeoHMatrix;

class CbmTrdGeoHandler : public TObject
{
public:

   /**
   * \brief Constructor.
   **/
   CbmTrdGeoHandler();

   /**
   * \brief Destructor.
   **/
   ~CbmTrdGeoHandler();

   void Init(Bool_t isSimulation = kFALSE);

   /**
   * \brief Return module address calculated based on the current node in the TGeoManager.
   */
   Int_t GetModuleAddress();

   /**
   * \brief Navigate to node and return module address.
   */
   Int_t GetModuleAddress(const TString& path);
          
//   /**
//   * \brief Return pad orientation of the current node in the TGeoManager.
//   */
//   Int_t GetModuleOrientation();

   /**
   * \brief Navigate to node and return pad orientation.
   */
   Int_t GetModuleOrientation(const TString& path);

   // Path has to contain information down to module part, 
   // otherwise retrieved information can be wrong.
   // Path examples:
   // /cave_1/trd_v13x_0/layer01_1101/module1_10100101/gas_1
   // /cave_1/trd_v13x_0/layer10_3210/module8_35411098/gas_1

   Double_t GetSizeX(const TString& path);
   Double_t GetSizeY(const TString& path);
   Double_t GetSizeZ(const TString& path);
   Double_t GetX(const TString& path);
   Double_t GetY(const TString& path);
   Double_t GetZ(const TString& path);
   Int_t GetModuleType(const TString& path);

   // for backward compatibility
   Int_t GetStation(const TString& path);
   Int_t GetLayer(const TString& path);
   Int_t GetModuleCopyNr(const TString& path);

private:

   void NavigateTo(const TString& path);

   Bool_t fIsSimulation; //!

   UInt_t       fGeoPathHash;   //!
   TGeoVolume*  fCurrentVolume; //!
   TGeoBBox*    fVolumeShape;   //!
   Double_t     fGlobal[3];     //! Global center of volume
   TGeoHMatrix* fGlobalMatrix;  //!
   Int_t        fLayerId;       //!
   Int_t        fModuleId;      //!
   Int_t        fModuleType;    //!
   Int_t        fRotation;      //! rotation angle 0,1,2,3

   // for backward compatibility
   Int_t        fStation;       //! StationTypeID, 1..3
   Int_t        fLayer;         //! LayerID within station, 1..4
   Int_t        fModuleCopy;    //! ModuleCopyID with module type

   CbmTrdGeoHandler(const CbmTrdGeoHandler&);
   CbmTrdGeoHandler operator=(const CbmTrdGeoHandler&);

   ClassDef(CbmTrdGeoHandler, 4)
};

#endif //CBMTRDGEOHANDLER_H