/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

// $Id$

/// \ingroup geometry
/// \class AliMUONGeometryBuilder
/// \brief Manager class for geometry construction via geometry builders.
///
/// \author Ivana Hrivnacova, IPN Orsay

#ifndef ALI_MUON_GEOMETRY_BUILDER_H
#define ALI_MUON_GEOMETRY_BUILDER_H

#include "AliMUONGeometry.h"

#include <TObject.h>
#include <TGeoMatrix.h>

class TObjArray;

class AliModule;
class AliMUONVGeometryBuilder;

class AliMUONGeometryBuilder : public TObject 
{
  public:
    AliMUONGeometryBuilder(AliModule* detector);
    AliMUONGeometryBuilder();
    virtual  ~AliMUONGeometryBuilder();
    
    // static methods
    static TGeoHMatrix Multiply(const TGeoMatrix& m1, const TGeoMatrix& m2); 
    static TGeoHMatrix Multiply(const TGeoMatrix& m1, const TGeoMatrix& m2,
                                const TGeoMatrix& m3); 
    static TGeoHMatrix Multiply(const TGeoMatrix& m1, const TGeoMatrix& m2,
                                const TGeoMatrix& m3, const TGeoMatrix& m4); 

    // methods
    //
    void  AddBuilder(AliMUONVGeometryBuilder* geomBuilder);
    void  CreateGeometry();
    void  CreateMaterials();

    void  InitGeometry();
    void  InitGeometry(const TString& svmapFileName);
    void  UpdateInternalGeometry();

    void  WriteSVMaps();
    void  WriteSVMaps(const TString& fileName, 
                      Bool_t rebuild = true, Bool_t writeEnvelopes = true);
    
    // Geometry parametrisation
    const AliMUONGeometry*            GetGeometry() const;
    const AliMUONGeometryTransformer* GetTransformer() const;

    // Alignement
    virtual Bool_t  GetAlign() const;
    virtual void    SetAlign(Bool_t align = true);
    virtual void    SetAlign(const TString& fileName, Bool_t align = true);
 
  protected:
    /// Not implemented
    AliMUONGeometryBuilder(const AliMUONGeometryBuilder& right);
    /// Not implemented
    AliMUONGeometryBuilder&  operator = (const AliMUONGeometryBuilder& right);
 
  private:
    // static methods
    static const TString& GetDefaultTransformFileName();    
    static const TString& GetDefaultSVMapFileName();    
    static const TString& GetOutFileNameExtension();        

    // method
    void PlaceVolume(const TString& name, const TString& mName, Int_t copyNo, 
             const TGeoHMatrix& matrix, Int_t npar, Double_t* param,
	     const char* only, Bool_t makeAssembly = false) const;
    void CreateGeometryWithTGeo();
    void CreateGeometryWithoutTGeo();
    void SetAlignToBuilder(AliMUONVGeometryBuilder* builder) const;	     

    // data members
    AliModule*       fModule;              ///< the AliRoot module
    Bool_t           fAlign;               ///< \brief option to read transformations 
                                           /// from a file
    TString          fTransformFileName;   ///< transformations file name					   
    TString          fSVMapFileName;       ///< svmaps file name					   
    TGeoCombiTrans   fGlobalTransformation;///< \brief global transformation 
                                           /// applied to the whole geometry 
    TObjArray*       fGeometryBuilders;    ///< list of Geometry Builders
    AliMUONGeometry* fGeometry;            ///< geometry parametrisation

  ClassDef(AliMUONGeometryBuilder,6)  // Geometry builder
};

// inline functions

/// Initialize geometry
inline void  AliMUONGeometryBuilder::InitGeometry()
{ InitGeometry(fSVMapFileName); }

/// Write sensitive volume maps
inline void  AliMUONGeometryBuilder::WriteSVMaps()
{ WriteSVMaps(fSVMapFileName + GetOutFileNameExtension()); }

/// Return geometry parametrisation
inline 
const AliMUONGeometry* AliMUONGeometryBuilder::GetGeometry() const
{ return fGeometry; }

/// Return geometry transformer
inline 
const AliMUONGeometryTransformer* AliMUONGeometryBuilder::GetTransformer() const
{ return fGeometry->GetTransformer(); }

/// Return option for reading transformations from a file
inline Bool_t  AliMUONGeometryBuilder::GetAlign() const
{ return fAlign; }

#endif //ALI_MUON_GEOMETRY_BUILDER_H