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//
//
//
//
// class G4VPhysicalVolume
//
// Class description:
//
// This is an Abstract Base class for the representation of positioned volume.  
// The volume is placed within a mother volume,  relative to its coordinate 
// system.  Either a single positioned volume or many positioned volume can 
// be represented by a particular G4VPhysicalVolume.

// History:
// 15.01.13 G.Cosmo, A.Dotti: Modified for thread-safety for MT
// 09.11.99 J.Apostolakis: Added GetObjectRotationValue() method & comments
// 28.08.96 P.Kent: Replaced transform by rotmat + vector
// 25.07.96 P.Kent: Modified interface for new `Replica' capable geometry 
// 24.07.95 P.Kent: First non-stub version
// --------------------------------------------------------------------
#ifndef G4VPHYSICALVOLUME_HH
#define G4VPHYSICALVOLUME_HH

#include "G4Types.hh"
#include "G4String.hh"

#include "geomdefs.hh"

#include "G4RotationMatrix.hh"
#include "G4ThreeVector.hh"
#include "G4GeomSplitter.hh"

class G4LogicalVolume;
class G4VPVParameterisation;

class G4PVData
{
  // Encapsulates the fields associated to G4VPhysicalVolume
  //  that are not read-only - they will change during simulation
  //  and must have a per-thread state.

  public:
    G4PVData():frot(0) {}

    void initialize() {
      frot = 0;
      ftrans = G4ThreeVector(0,0,0);
    }

    G4RotationMatrix *frot;
    G4ThreeVector ftrans;
};

typedef G4GeomSplitter<G4PVData> G4PVManager;
// Implementation detail for use of G4PVData objects 

class G4VPhysicalVolume
{
  public:  // with description

    G4VPhysicalVolume(G4RotationMatrix *pRot,
                const G4ThreeVector &tlate,
                const G4String &pName,
                      G4LogicalVolume *pLogical,
                      G4VPhysicalVolume *pMother);
      // Initialise volume, positioned in a frame which is rotated by *pRot, 
      // relative to the coordinate system of the mother volume pMother.
      // The center of the object is then placed at tlate in the new
      // coordinates. If pRot=0 the volume is unrotated with respect to its
      // mother. The physical volume is added to the mother's logical volume.
      //
      // Must be called by all subclasses. pMother must point to a valid parent
      // volume, except in the case of the world/top volume, when it =0.
      // 
      // The constructor also registers volume with physical volume Store.
      // Note that the Store may be removed or dynamically built in future
      // because of memory constraints.

    virtual ~G4VPhysicalVolume();
      // Destructor, will be subclassed. Removes volume from volume Store.

    inline G4bool operator == (const G4VPhysicalVolume& p) const;
      // Equality defined by equal addresses only.

    // Access functions
    //
    // The following are accessor functions that make a distinction
    // between whether the rotation/translation is being made for the
    // frame or the object/volume that is being placed.
    // (They are the inverse of each other).

    G4RotationMatrix* GetObjectRotation() const;              //  Obsolete 
    G4RotationMatrix  GetObjectRotationValue() const;  //  Replacement
    G4ThreeVector  GetObjectTranslation() const;
      // Return the rotation/translation of the Object relative to the mother.
    const G4RotationMatrix* GetFrameRotation() const;
    G4ThreeVector  GetFrameTranslation() const;
      // Return the rotation/translation of the Frame used to position 
      // this volume in its mother volume (opposite of object rot/trans).

    // Older access functions, that do not distinguish between frame/object!

    const G4ThreeVector& GetTranslation() const;
    const G4RotationMatrix* GetRotation() const;
      // Old access functions, that do not distinguish between frame/object!
      // They return the translation/rotation of the volume.

    // Set functions

    void SetTranslation(const G4ThreeVector &v);
    G4RotationMatrix* GetRotation();
    void SetRotation(G4RotationMatrix*);
      // NOT INTENDED FOR GENERAL USE.
      // Non constant versions of above. Used to change transformation
      // for replication/parameterisation mechanism.

    inline G4LogicalVolume* GetLogicalVolume() const;
      // Return the associated logical volume.
    inline void SetLogicalVolume(G4LogicalVolume *pLogical);
      // Set the logical volume. Must not be called when geometry closed.

    inline G4LogicalVolume* GetMotherLogical() const;
      // Return the current mother logical volume pointer.
    inline void SetMotherLogical(G4LogicalVolume *pMother);
      // Set the mother logical volume. Must not be called when geometry closed.

    inline const G4String& GetName() const;
      // Return the volume's name.
    inline void SetName(const G4String& pName);
      // Set the volume's name.

    inline EVolume VolumeType() const;
      // Characterise the `type' of volume - normal/replicated/parameterised.

    virtual G4int GetMultiplicity() const;
      // Returns number of object entities (1 for normal placements,
      // n for replicas or parameterised).

    // Functions required of subclasses

    virtual G4bool IsMany() const = 0;
      // Return true if the volume is MANY (not implemented yet).
    virtual G4int GetCopyNo() const = 0;
      // Return the volumes copy number.
    virtual void  SetCopyNo(G4int CopyNo) = 0;
      // Set the volumes copy number.
    virtual G4bool IsReplicated() const = 0;
      // Return true if replicated (single object instance represents
      // many real volumes), else false.
    virtual G4bool IsParameterised() const = 0;
      // Return true if parameterised (single object instance represents
      // many real parameterised volumes), else false.
    virtual G4VPVParameterisation* GetParameterisation() const = 0;
      // Return replicas parameterisation object (able to compute dimensions
      // and transformations of replicas), or NULL if not applicable.
    virtual void GetReplicationData(EAxis& axis,
                                    G4int& nReplicas,
                                    G4double& width,
                                    G4double& offset,
                                    G4bool& consuming) const = 0;
      // Return replication information. No-op for no replicated volumes.
    virtual G4bool  IsRegularStructure() const = 0;
      // Returns true if the underlying volume structure is regular.
    virtual G4int  GetRegularStructureId() const = 0;
      // Returns non-zero code in case the underlying volume structure 
      //  is regular, voxel-like.  Value is id for structure type.
      //  If non-zero the volume is a candidate for specialised 
      //  navigation such as 'nearest neighbour' directly on volumes.
    virtual G4bool CheckOverlaps(G4int res=1000, G4double tol=0.,
                                 G4bool verbose=true, G4int errMax=1);
      // Verifies if the placed volume is overlapping with existing
      // daughters or with the mother volume. Provides default resolution
      // for the number of points to be generated and verified.
      // Concrete implementation is done and required only for placed and
      // parameterised volumes. Returns true if the volume is overlapping.

  public:  // without description

    G4VPhysicalVolume(__void__&);
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.

    inline G4int GetInstanceID() const;
      // Returns the instance ID.

    static const G4PVManager& GetSubInstanceManager();
      // Returns the private data instance manager.

    static void Clean();
      // Clear memory allocated by sub-instance manager.

  protected:

    void InitialiseWorker(G4VPhysicalVolume *pMasterObject,
                          G4RotationMatrix *pRot, const G4ThreeVector &tlate);
      // This method is similar to the constructor. It is used by each worker
      // thread to achieve the partial effect as that of the master thread.

    void TerminateWorker(G4VPhysicalVolume *pMasterObject);
      // This method is similar to the destructor. It is used by each worker
      // thread to achieve the partial effect as that of the master thread.

  protected:

    G4int instanceID;
      // For use in implementing the per-thread data,
      //   It is equivalent to a pointer to a G4PVData object.
    G4GEOM_DLL static G4PVManager subInstanceManager;
      //  Needed to use G4PVManager for the G4PVData per-thread objects.

  private:

    G4VPhysicalVolume(const G4VPhysicalVolume&);
    G4VPhysicalVolume& operator=(const G4VPhysicalVolume&);
      // Private copy constructor and assignment operator.

  private:

    G4LogicalVolume* flogical;   // The logical volume representing the
                                 // physical and tracking attributes of
                                 // the volume
    G4String fname;              // The name of the volume
    G4LogicalVolume* flmother;   // The current mother logical volume

    G4PVData* pvdata;  // Shadow pointer for use of object persistency
};

// NOTE: 
// The type G4PVManager is introduced to encapsulate the methods used by
// both the master thread and worker threads to allocate memory space for
// the fields encapsulated by the class G4PVData. When each thread
// initializes the value for these fields, it refers to them using a macro
// definition defined below. For every G4VPhysicalVolume instance, there is
// a corresponding G4PVData instance. All G4PVData instances are organized
// by the class G4PVManager as an array.
// The field "int instanceID" is added to the class G4VPhysicalVolume.
// The value of this field in each G4VPhysicalVolume instance is the subscript
// of the corresponding G4PVData instance.
// In order to use the class G4PVManager, we add a static member in the class
// G4VPhysicalVolume as follows: "static G4PVManager subInstanceManager;".
// For the master thread, the array for G4PVData instances grows dynamically
// along with G4VPhysicalVolume instances are created. For each worker thread,
// it copies the array of G4PVData instances from the master thread.           
// In addition, it invokes a method similiar to the constructor explicitly
// to achieve the partial effect for each instance in the array.
//

#include "G4VPhysicalVolume.icc"

#endif
