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// $Id: G4SubtractionSolid.cc,v 1.2 2015/03/17 05:50:57 sunss Exp $
// GEANT4 tag $Name: BesSim-00-01-24 $
//
// Implementation of methods for the class G4IntersectionSolid
//
// History:
//
// 14.10.98 V.Grichine: implementation of the first version 
// 19.10.98 V.Grichine: new algorithm of DistanceToIn(p,v)
// 02.08.99 V.Grichine: bugs fixed in DistanceToOut(p,v,...)
//                      while -> do-while & surfaceA limitations
// 13.09.00 V.Grichine: bug fixed in SurfaceNormal(p), p can be inside
//
// --------------------------------------------------------------------

#include "G4SubtractionSolid.hh"

#include "G4VoxelLimits.hh"
#include "G4VPVParameterisation.hh"
#include "G4GeometryTolerance.hh"

#include "G4VGraphicsScene.hh"
#include "G4Polyhedron.hh"
#include "G4NURBS.hh"
// #include "G4NURBSbox.hh"

#include <sstream>

//
// Transfer all data members to G4BooleanSolid which is responsible
// for them. pName will be in turn sent to G4VSolid

G4SubtractionSolid::G4SubtractionSolid( const G4String& pName,
                                              G4VSolid* pSolidA ,
                                              G4VSolid* pSolidB   )
  : G4BooleanSolid(pName,pSolidA,pSolidB)
{
}

//
// Constructor
 
G4SubtractionSolid::G4SubtractionSolid( const G4String& pName,
                                              G4VSolid* pSolidA ,
                                              G4VSolid* pSolidB ,
                                              G4RotationMatrix* rotMatrix,
                                        const G4ThreeVector& transVector )
  : G4BooleanSolid(pName,pSolidA,pSolidB,rotMatrix,transVector)
{
} 

//
// Constructor

G4SubtractionSolid::G4SubtractionSolid( const G4String& pName,
                                              G4VSolid* pSolidA ,
                                              G4VSolid* pSolidB ,
                                        const G4Transform3D& transform )
  : G4BooleanSolid(pName,pSolidA,pSolidB,transform)
{
}

//
// Fake default constructor - sets only member data and allocates memory
//                            for usage restricted to object persistency.

G4SubtractionSolid::G4SubtractionSolid( __void__& a )
  : G4BooleanSolid(a)
{
}

//
// Destructor

G4SubtractionSolid::~G4SubtractionSolid()
{
}

//
// CalculateExtent
     
G4bool 
G4SubtractionSolid::CalculateExtent( const EAxis pAxis,
                                     const G4VoxelLimits& pVoxelLimit,
                                     const G4AffineTransform& pTransform,
                                           G4double& pMin,
                                           G4double& pMax ) const 
{
  // Since we cannot be sure how much the second solid subtracts 
  // from the first,    we must use the first solid's extent!

  return fPtrSolidA->CalculateExtent( pAxis, pVoxelLimit, 
                                      pTransform, pMin, pMax );
}
 
//
// Touching ? Empty subtraction ?

EInside G4SubtractionSolid::Inside( const G4ThreeVector& p ) const
{
  EInside positionA = fPtrSolidA->Inside(p);
  if (positionA == kOutside) return kOutside;

  EInside positionB = fPtrSolidB->Inside(p);
  
  if(positionA == kInside && positionB == kOutside)
  {
    return kInside ;
  }
  else
  {
    if(( positionA == kInside && positionB == kSurface) ||
       ( positionB == kOutside && positionA == kSurface) ||
       ( positionA == kSurface && positionB == kSurface &&
         ( fPtrSolidA->SurfaceNormal(p) - 
           fPtrSolidB->SurfaceNormal(p) ).mag2() > 
            1000*G4GeometryTolerance::GetInstance()->GetRadialTolerance() ) )
    {
      return kSurface;
    }
    else
    {
      return kOutside;
    }
  }
}

//
// SurfaceNormal

G4ThreeVector 
G4SubtractionSolid::SurfaceNormal( const G4ThreeVector& p ) const 
{
  G4ThreeVector normal;
  if( Inside(p) == kOutside )
  {
#ifdef G4BOOLDEBUG
    G4cout << "WARNING - Invalid call [1] in "
           << "G4SubtractionSolid::SurfaceNormal(p)" << G4endl
           << "  Point p is inside !" << G4endl;
    G4cout << "          p = " << p << G4endl;
    G4cerr << "WARNING - Invalid call [1] in "
           << "G4SubtractionSolid::SurfaceNormal(p)" << G4endl
           << "  Point p is inside !" << G4endl;
    G4cerr << "          p = " << p << G4endl;
#endif
  }
  else
  { 
    if( fPtrSolidA->Inside(p) == kSurface && 
        fPtrSolidB->Inside(p) != kInside      ) 
    {
      normal = fPtrSolidA->SurfaceNormal(p) ;
    }
    else if( fPtrSolidA->Inside(p) == kInside && 
             fPtrSolidB->Inside(p) != kOutside    )
    {
      normal = -fPtrSolidB->SurfaceNormal(p) ;
    }
    else 
    {
      if ( fPtrSolidA->DistanceToOut(p) <= fPtrSolidB->DistanceToIn(p) )
      {
        normal = fPtrSolidA->SurfaceNormal(p) ;
      }
      else
      {
        normal = -fPtrSolidB->SurfaceNormal(p) ;
      }
#ifdef G4BOOLDEBUG
      if(Inside(p) == kInside)
      {
        G4cout << "WARNING - Invalid call [2] in "
             << "G4SubtractionSolid::SurfaceNormal(p)" << G4endl
             << "  Point p is inside !" << G4endl;
        G4cout << "          p = " << p << G4endl;
        G4cerr << "WARNING - Invalid call [2] in "
             << "G4SubtractionSolid::SurfaceNormal(p)" << G4endl
             << "  Point p is inside !" << G4endl;
        G4cerr << "          p = " << p << G4endl;
      }
#endif
    }
  }
  return normal;
}

//
// The same algorithm as in DistanceToIn(p)

G4double 
G4SubtractionSolid::DistanceToIn(  const G4ThreeVector& p,
                                   const G4ThreeVector& v  ) const 
{
  G4double dist = 0.0,disTmp = 0.0 ;
    
#ifdef G4BOOLDEBUG
  if( Inside(p) == kInside )
  {
    G4cout << "WARNING - Invalid call in "
           << "G4SubtractionSolid::DistanceToIn(p,v)" << G4endl
           << "  Point p is inside !" << G4endl;
    G4cout << "          p = " << p << G4endl;
    G4cout << "          v = " << v << G4endl;
    G4cerr << "WARNING - Invalid call in "
           << "G4SubtractionSolid::DistanceToIn(p,v)" << G4endl
           << "  Point p is inside !" << G4endl;
    G4cerr << "          p = " << p << G4endl;
    G4cerr << "          v = " << v << G4endl;
  }
#endif

    // if( // ( fPtrSolidA->Inside(p) != kOutside) &&  // case1:p in both A&B 
    if ( fPtrSolidB->Inside(p) != kOutside )   // start: out of B
    {
      dist = fPtrSolidB->DistanceToOut(p,v) ; // ,calcNorm,validNorm,n) ;
      
      if( fPtrSolidA->Inside(p+dist*v) != kInside )
      {
        do
        {
          disTmp = fPtrSolidA->DistanceToIn(p+dist*v,v) ;

          if(disTmp == kInfinity)
          {  
            return kInfinity ;
          }
          dist += disTmp ;

          if( Inside(p+dist*v) == kOutside )
          {
            disTmp = fPtrSolidB->DistanceToOut(p+dist*v,v) ; 
            dist += disTmp ;
          }         
        }
        while( Inside(p+dist*v) == kOutside ) ;
      }
    }
    else // p outside A, start in A
    {
      dist = fPtrSolidA->DistanceToIn(p,v) ;
      
      if( dist == kInfinity ) // past A, hence past A\B
      {
        return kInfinity ;
      }
      else
      {
        int loopflag=0;
        while( Inside(p+dist*v) == kOutside )  // pushing loop
        {
          loopflag++;
          if(loopflag>10000) {
            std::cout<<"G4SubtractionSolid::DistanceToIn loop >10000"<<std::endl;
            return kInfinity ;
          }
          disTmp = fPtrSolidB->DistanceToOut(p+dist*v,v) ;
          dist += disTmp ;

          if( Inside(p+dist*v) == kOutside )
          { 
            disTmp = fPtrSolidA->DistanceToIn(p+dist*v,v) ;

            if(disTmp == kInfinity) // past A, hence past A\B
            {  
              return kInfinity ;
            }                 
            dist += disTmp ;
          }
        }
      }
    }
  
  return dist ;
}

//
// Approximate nearest distance from the point p to the intersection of
// two solids. It is usually underestimated from the point of view of
// isotropic safety

G4double 
G4SubtractionSolid::DistanceToIn( const G4ThreeVector& p ) const 
{
  G4double dist=0.0;

#ifdef G4BOOLDEBUG
  if( Inside(p) == kInside )
  {
    G4cout << "WARNING - Invalid call in "
           << "G4SubtractionSolid::DistanceToIn(p)" << G4endl
           << "  Point p is inside !" << G4endl;
    G4cout << "          p = " << p << G4endl;
    G4cerr << "WARNING - Invalid call in "
           << "G4SubtractionSolid::DistanceToIn(p)" << G4endl
           << "  Point p is inside !" << G4endl;
    G4cerr << "          p = " << p << G4endl;
  }
#endif

  if( ( fPtrSolidA->Inside(p) != kOutside) &&   // case 1
      ( fPtrSolidB->Inside(p) != kOutside)    )
  {
      dist= fPtrSolidB->DistanceToOut(p)  ;
  }
  else
  {
      dist= fPtrSolidA->DistanceToIn(p) ; 
  }
  
  return dist; 
}

//
// The same algorithm as DistanceToOut(p)

G4double 
G4SubtractionSolid::DistanceToOut( const G4ThreeVector& p,
                 const G4ThreeVector& v,
                 const G4bool calcNorm,
                       G4bool *validNorm,
                       G4ThreeVector *n ) const 
{
#ifdef G4BOOLDEBUG
    if( Inside(p) == kOutside )
    {
      G4cout << "Position:"  << G4endl << G4endl;
      G4cout << "p.x() = "   << p.x()/mm << " mm" << G4endl;
      G4cout << "p.y() = "   << p.y()/mm << " mm" << G4endl;
      G4cout << "p.z() = "   << p.z()/mm << " mm" << G4endl << G4endl;
      G4cout << "Direction:" << G4endl << G4endl;
      G4cout << "v.x() = "   << v.x() << G4endl;
      G4cout << "v.y() = "   << v.y() << G4endl;
      G4cout << "v.z() = "   << v.z() << G4endl << G4endl;
      G4cout << "WARNING - Invalid call in "
             << "G4SubtractionSolid::DistanceToOut(p,v)" << G4endl
             << "  Point p is outside !" << G4endl;
      G4cout << "          p = " << p << G4endl;
      G4cout << "          v = " << v << G4endl;
      G4cerr << "WARNING - Invalid call in "
             << "G4SubtractionSolid::DistanceToOut(p,v)" << G4endl
             << "  Point p is outside !" << G4endl;
      G4cerr << "          p = " << p << G4endl;
      G4cerr << "          v = " << v << G4endl;
    }
#endif

    G4double distout;
    G4double distA = fPtrSolidA->DistanceToOut(p,v,calcNorm,validNorm,n) ;
    G4double distB = fPtrSolidB->DistanceToIn(p,v) ;
    if(distB < distA)
    {
      if(calcNorm)
      {
        *n = -(fPtrSolidB->SurfaceNormal(p+distB*v)) ;
        *validNorm = false ;
      }
      distout= distB ;
    }
    else
    {
      distout= distA ; 
    } 
    return distout;
}

//
// Inverted algorithm of DistanceToIn(p)

G4double 
G4SubtractionSolid::DistanceToOut( const G4ThreeVector& p ) const 
{
  G4double dist=0.0;

  if( Inside(p) == kOutside )
  { 
#ifdef G4BOOLDEBUG
    G4cout << "WARNING - Invalid call in "
           << "G4SubtractionSolid::DistanceToOut(p)" << G4endl
           << "  Point p is outside" << G4endl;
    G4cout << "          p = " << p << G4endl;
    G4cerr << "WARNING - Invalid call in "
           << "G4SubtractionSolid::DistanceToOut(p)" << G4endl
           << "  Point p is outside" << G4endl;
    G4cerr << "          p = " << p << G4endl;
#endif
  }
  else
  {
     dist= std::min(fPtrSolidA->DistanceToOut(p),
                      fPtrSolidB->DistanceToIn(p) ) ; 
  }
  return dist; 
}

//
//

G4GeometryType G4SubtractionSolid::GetEntityType() const 
{
  return G4String("G4SubtractionSolid");
}

//
//

void 
G4SubtractionSolid::ComputeDimensions(       G4VPVParameterisation*,
                                       const G4int,
                                       const G4VPhysicalVolume* ) 
{
}

//
//                    

void 
G4SubtractionSolid::DescribeYourselfTo ( G4VGraphicsScene& scene ) const 
{
  scene.AddSolid (*this);
}

//
//

G4Polyhedron* 
G4SubtractionSolid::CreatePolyhedron () const 
{
  G4Polyhedron* pA = fPtrSolidA->GetPolyhedron();
  G4Polyhedron* pB = fPtrSolidB->GetPolyhedron();
  if (pA && pB)
  {
    G4Polyhedron* resultant = new G4Polyhedron (pA->subtract(*pB));
    return resultant;
  }
  else
  {
    std::ostringstream oss;
    oss << "Solid - " << GetName()
        << " - one of the Boolean components has no" << G4endl
        << " corresponding polyhedron. Returning NULL !";
    G4Exception("G4SubtractionSolid::CreatePolyhedron()", "InvalidSetup",
                JustWarning, oss.str().c_str());
    return 0;
  }
}

//
//

G4NURBS*      
G4SubtractionSolid::CreateNURBS () const 
{
  // Take into account boolean operation - see CreatePolyhedron.
  // return new G4NURBSbox (1.0, 1.0, 1.0);
  return 0;
}

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