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// 
// John Allison  5th September 2018, based on G4PhysicalVolumeSearchScene
// An artificial scene to find physical volumes. Instead of returning the
// first occurence (G4PhysicalVolumeSearchScene) this class (note the extra
// 's' in the name of this class) returns a vector of all occurences.
// It can match a physical volume name with the required match. The latter can
// be of the form "/regexp/", where regexp is a regular expression (see C++
// regex), or a plain string, in which case there must be an exact match.

#ifndef G4PHYSICALVOLUMESSEARCHSCENE_HH
#define G4PHYSICALVOLUMESSEARCHSCENE_HH

#include "G4PseudoScene.hh"

#include "G4VPhysicalVolume.hh"
#include "G4PhysicalVolumeModel.hh"

class G4PhysicalVolumesSearchScene: public G4PseudoScene
{
public:

  G4PhysicalVolumesSearchScene
  (G4PhysicalVolumeModel* pSearchVolumeModel,    // usually a world
   const G4String&        requiredPhysicalVolumeName,
   G4int                  requiredCopyNo = -1);  // -1 means any copy no

  virtual ~G4PhysicalVolumesSearchScene () {}

  struct Findings
  {
    Findings
    (G4VPhysicalVolume* pSearchPV,
     G4VPhysicalVolume* pFoundPV,
     G4int foundPVCopyNo = 0,
     G4int foundDepth = 0,
     std::vector<G4PhysicalVolumeModel::G4PhysicalVolumeNodeID>
     foundBasePVPath =
     std::vector<G4PhysicalVolumeModel::G4PhysicalVolumeNodeID>(),
     G4Transform3D foundObjectTransformation = G4Transform3D())
    : fpSearchPV(pSearchPV)
    , fpFoundPV(pFoundPV)
    , fFoundPVCopyNo(foundPVCopyNo)
    , fFoundDepth(foundDepth)
    , fFoundBasePVPath(foundBasePVPath)
    , fFoundObjectTransformation(foundObjectTransformation) {}
    G4VPhysicalVolume*   fpSearchPV;   // Searched physical volume.
    G4VPhysicalVolume*   fpFoundPV;    // Found physical volume.
    G4int                fFoundPVCopyNo;  // Found Copy number.
    G4int                fFoundDepth;  // Found depth.
    std::vector<G4PhysicalVolumeModel::G4PhysicalVolumeNodeID>
    fFoundBasePVPath;    // Base path (e.g., empty for world volume)
    G4Transform3D        fFoundObjectTransformation;  // Found transformation.
  };

  const std::vector<Findings>& GetFindings() const
  {return fFindings;}

private:

  class Matcher {
  public:
    Matcher(const G4String& requiredMatch);
    G4bool Match(const G4String&);
    // Match the string with the required match. The latter can be of the form
    // "/regexp/", where regexp is a regular expression (see C++ regex),
    // or a plain string, in which case there must be an exact match.
  private:
    G4bool   fRegexFlag;  // True if fRequiredMatch is of the form "/.../".
    G4String fRequiredMatch;
  };

  void ProcessVolume(const G4VSolid&);
  
  const G4PhysicalVolumeModel* fpSearchVolumesModel;
  Matcher                      fMatcher;
  G4int                        fRequiredCopyNo;
  std::vector<Findings>        fFindings;
};

#endif
