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 // Copyright (c) 2025 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _GeomFill_NetworkSurface_HeaderFile
 #define _GeomFill_NetworkSurface_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Geom_BSplineCurve.hxx>
 #include <Geom_BSplineSurface.hxx>
 #include <NCollection_Array1.hxx>
 #include <NCollection_Array2.hxx>
 #include <gp_Pnt.hxx>
 
 //! Low-level Gordon surface construction from a compatible B-spline curve network.
 //!
 //! This class builds the final surface for an already prepared Gordon network:
 //! input curves must be explicit non-periodic B-spline curves, consistently
 //! ordered, and consistently reparametrized. Curve families are made compatible
 //! by the builder before skinning when they are polynomial.
 //!
 //! Profile skin, guide skin, and an intersection-grid reference surface are
 //! built in B-spline form and aligned to a common knot basis. The final surface
 //! is obtained by moving the profile-skin poles by the guide-skin deviation
 //! measured from this reference surface. No point-grid surface approximation is
 //! performed here.
 //!
 //! This class does not find curve intersections, sort the network, convert
 //! arbitrary curves, or reparametrize the input. These operations are handled
 //! by GeomFill_Gordon before calling this builder.
 //!
 //! Limitations:
 //! - Periodic input curves are not accepted; callers should expand a required
 //!   period before initialization.
 //! - Rational construction uses exact common-denominator multiplication and
 //!   can fail if the resulting product degree exceeds OCCT's B-spline degree
 //!   limit.
 //! - At least two profiles and two guides are required
 class GeomFill_NetworkSurface
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Result state of the last Perform() call.
   enum class ResultStatus
   {
     NotStarted,                 //!< Perform() has not been called since initialization.
     Done,                       //!< Surface has been constructed.
     InvalidInput,               //!< Prepared network does not satisfy builder requirements.
     CurveCompatibilityFailed,   //!< Curve families could not be converted to a compatible basis.
     SkinningFailed,             //!< Profile or guide skin interpolation has failed.
     ReferenceSurfaceFailed,     //!< Intersection-grid reference surface could not be built.
     KnotAlignmentFailed,        //!< Intermediate surfaces could not be aligned to one knot basis.
     RationalDegreeOverflow,     //!< Exact rational product degree exceeds OCCT's B-spline limit.
     RationalConstructionFailed, //!< Exact rational numerator/denominator construction has failed.
     ConstructionFailed,         //!< Internal B-spline construction has failed.
     PeriodicityFailed           //!< Closed seam could not be converted to periodic form.
   };
 
   //! Creates an empty network surface algorithm.
   Standard_EXPORT GeomFill_NetworkSurface();
 
   //! Initializes the algorithm with a compatible profile/guide B-spline network.
   //! @param[in] theProfiles          profile curves evaluated in U direction
   //! @param[in] theGuides            guide curves evaluated in V direction
   //! @param[in] theProfileParameters V parameters locating profiles on guide skin
   //! @param[in] theGuideParameters   U parameters locating guides on profile skin
   //! @param[in] theIntersectionPoints validated profile/guide contact grid
   //! @param[in] theIntersectionWeights rational weights for the contact grid
   //! @param[in] theTolerance         geometric tolerance for closed-seam checks
   //! @param[in] theIsUClosed         indicates that first/last guide curves close the U seam
   //! @param[in] theIsVClosed         indicates that first/last profile curves close the V seam
   Standard_EXPORT void Init(const NCollection_Array1<occ::handle<Geom_BSplineCurve>>& theProfiles,
                             const NCollection_Array1<occ::handle<Geom_BSplineCurve>>& theGuides,
                             const NCollection_Array1<double>& theProfileParameters,
                             const NCollection_Array1<double>& theGuideParameters,
                             const NCollection_Array2<gp_Pnt>& theIntersectionPoints,
                             const NCollection_Array2<double>& theIntersectionWeights,
                             double                            theTolerance,
                             bool                              theIsUClosed,
                             bool                              theIsVClosed);
 
   //! Performs the pole-based network surface construction.
   Standard_EXPORT void Perform();
 
   //! Returns true if the surface was successfully constructed.
   [[nodiscard]] bool IsDone() const { return myStatus == ResultStatus::Done; }
 
   //! Returns the result state of the last Perform() call.
   [[nodiscard]] ResultStatus Status() const { return myStatus; }
 
   //! Returns the constructed B-spline surface.
   //! @throws StdFail_NotDone if Perform() has not completed successfully.
   [[nodiscard]] Standard_EXPORT const occ::handle<Geom_BSplineSurface>& Surface() const;
 
 private:
   NCollection_Array1<occ::handle<Geom_BSplineCurve>> myProfiles;
   NCollection_Array1<occ::handle<Geom_BSplineCurve>> myGuides;
   NCollection_Array1<double>                         myProfileParameters;
   NCollection_Array1<double>                         myGuideParameters;
   NCollection_Array2<gp_Pnt>                         myIntersectionPoints;
   NCollection_Array2<double>                         myIntersectionWeights;
   occ::handle<Geom_BSplineSurface>                   mySurface;
   double                                             myTolerance = 0.0;
   bool                                               myIsUClosed = false;
   bool                                               myIsVClosed = false;
   ResultStatus                                       myStatus    = ResultStatus::NotStarted;
 };
 
 #endif // _GeomFill_NetworkSurface_HeaderFile

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