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// $Id: G4ReplicaNavigation.hh,v 1.3 2004/03/10 18:21:15 gcosmo Exp $
// GEANT4 tag $Name: geant4-07-00-cand-01 $
//
// 
// class G4ReplicaNavigation
//
// Class description:
//
// Utility for navigation in volumes containing a single G4PVParameterised
// volume for which voxels for the replicated volumes have been constructed.
// [Voxels MUST be along one axis only: NOT refined]

// History:
// - Created. Paul Kent, Aug 96
// --------------------------------------------------------------------
#ifndef G4REPLICANAVIGATION_HH
#define G4REPLICANAVIGATION_HH

#include "G4Types.hh"
#include "G4NavigationHistory.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4ThreeVector.hh"
#include "G4BlockingList.hh"

// Required for voxel handling
//
#include "G4SmartVoxelHeader.hh"

class G4VSolid;

class G4ReplicaNavigation
{
   friend class G4ReplicaNavigationTester;

 public:  // with description

  G4ReplicaNavigation();
  ~G4ReplicaNavigation();

  inline G4bool LevelLocate( G4NavigationHistory& history,
                       const G4VPhysicalVolume *blockedVol,
                       const G4int blockedNum,
                       const G4ThreeVector &globalPoint,
                       const G4ThreeVector* globalDirection,
                       const G4bool pLocatedOnEdge, 
                             G4ThreeVector &localPoint );

  G4double ComputeStep( const G4ThreeVector &globalPoint,
                        const G4ThreeVector &globalDirection,
                        const G4ThreeVector &localPoint,
                        const G4ThreeVector &localDirection,
                        const G4double currentProposedStepLength,
                              G4double &newSafety,
                              G4NavigationHistory &history,
                              G4bool &validExitNormal,
                              G4ThreeVector &exitNormal,
                              G4bool &exiting,
                              G4bool &entering,
                              G4VPhysicalVolume *(*pBlockedPhysical),
                              G4int &blockedReplicaNo );

  G4double ComputeSafety( const G4ThreeVector &globalPoint,
                          const G4ThreeVector &localPoint,
                                G4NavigationHistory &history,
                          const G4double pProposedMaxLength=DBL_MAX );

  EInside BackLocate( G4NavigationHistory &history,
                const G4ThreeVector &globalPoint,
                      G4ThreeVector &localPoint,
                const G4bool &exiting,
                      G4bool &notKnownInside ) const;

  void ComputeTransformation( const G4int replicaNo,
                                    G4VPhysicalVolume *pVol,
                                    G4ThreeVector &point ) const; 
  void ComputeTransformation( const G4int replicaNo,
                                    G4VPhysicalVolume *pVol ) const; 

  EInside Inside( const G4VPhysicalVolume *pVol,
                  const G4int replicaNo,
                  const G4ThreeVector &localPoint ) const;
  G4double DistanceToOut( const G4VPhysicalVolume *pVol,
                          const G4int replicaNo,
                          const G4ThreeVector &localPoint ) const;
  G4double DistanceToOut( const G4VPhysicalVolume *pVol,
                          const G4int replicaNo,
                          const G4ThreeVector &localPoint,
                          const G4ThreeVector &localDirection ) const;

  inline G4int GetVerboseLevel() const;
  inline void  SetVerboseLevel(G4int level);
    // Get/Set Verbose(ness) level.
    // [if level>0 && G4VERBOSE, printout can occur]

  inline void  CheckMode(G4bool mode);
    // Run navigation in "check-mode", therefore using additional
    // verifications and more strict correctness conditions.
    // Is effective only with G4VERBOSE set.

 private:

  inline G4int VoxelLocate( const G4SmartVoxelHeader *pHead,
                            const G4ThreeVector &localPoint,
                            const G4int blocked=-1 ) const;

  G4double DistanceToOutPhi( const G4ThreeVector &localPoint,
                             const G4ThreeVector &localDirection,
                             const G4double width ) const;

  G4double DistanceToOutRad( const G4ThreeVector &localPoint,
                             const G4ThreeVector &localDirection,
                             const G4double width,
                             const G4double offset,
                             const G4int replicaNo ) const;
  inline void SetPhiTransformation( const G4double ang,
                                          G4VPhysicalVolume *pVol=0 ) const;
 private:

    G4bool fCheck; 
    G4int  fVerbose;
};

#include "G4ReplicaNavigation.icc"

#endif