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 // Copyright: Open CASCADE 2014
 // Created on: 2012-06-09
 // Created by: jgv@ROLEX
 // Copyright (c) 2012-2014 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 _ShapeUpgrade_UnifySameDomain_HeaderFile
 #define _ShapeUpgrade_UnifySameDomain_HeaderFile
 
 #include <BRepTools_History.hxx>
 #include <Standard.hxx>
 #include <Standard_Type.hxx>
 
 #include <TopoDS_Shape.hxx>
 #include <Standard_Boolean.hxx>
 #include <Standard_Transient.hxx>
 #include <TopTools_DataMapOfShapeShape.hxx>
 #include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
 #include <TopTools_MapOfShape.hxx>
 #include <TopTools_SequenceOfShape.hxx>
 #include <Geom_Plane.hxx>
 #include <Precision.hxx>
 class ShapeBuild_ReShape;
 
 
 class ShapeUpgrade_UnifySameDomain;
 DEFINE_STANDARD_HANDLE(ShapeUpgrade_UnifySameDomain, Standard_Transient)
 
 //! This tool tries to unify faces and edges of the shape which lie on the same geometry.
 //! Faces/edges are considering as 'same-domain' if a group of neighbouring faces/edges
 //! are lying on coincident surfaces/curves.
 //! In this case these faces/edges can be unified into one face/edge.
 //! ShapeUpgrade_UnifySameDomain is initialized by a shape and the next optional parameters:
 //! UnifyFaces - tries to unify all possible faces
 //! UnifyEdges - tries to unify all possible edges
 //! ConcatBSplines - if this flag is set to true then all neighbouring edges, which lay
 //! on BSpline or Bezier curves with C1 continuity on their common vertices,
 //! will be merged into one common edge.
 //!
 //! The input shape can be of any type containing faces or edges - compsolid, solid, shell, 
 //! wire, compound of any kind of shapes. The algorithm preserves the structure of compsolids,
 //! solids, shells and wires. E.g., if two shells have a common edge and the faces sharing
 //! this edge lie on the same surface the algorithm will not unify these faces, otherwise 
 //! the structure of shells would be broken. However, if such faces belong to different
 //! compounds of faces they will be unified.
 //! 
 //! The output result of the tool is the unified shape.
 //!
 //! All the modifications of initial shape are recorded during unifying.
 //! Methods History are intended to: <br>
 //! - set a place holder for the history of modifications of sub-shapes of
 //!   the initial shape; <br>
 //! - get the collected history. <br>
 //! The algorithm provides a place holder for the history and collects the
 //! history by default.
 //! To avoid collecting of the history the place holder should be set to null handle.
 class ShapeUpgrade_UnifySameDomain : public Standard_Transient
 {
 
 public:
 
   typedef NCollection_DataMap<TopoDS_Shape, Handle(Geom_Plane), TopTools_ShapeMapHasher> DataMapOfFacePlane;
   typedef NCollection_DataMap<TopoDS_Shape, TopTools_MapOfShape, TopTools_ShapeMapHasher> DataMapOfShapeMapOfShape;
   
   //! Empty constructor
   Standard_EXPORT ShapeUpgrade_UnifySameDomain();
   
   //! Constructor defining input shape and necessary flags.
   //! It does not perform unification.
   Standard_EXPORT ShapeUpgrade_UnifySameDomain
                    (const TopoDS_Shape& aShape, 
                     const Standard_Boolean UnifyEdges = Standard_True,
                     const Standard_Boolean UnifyFaces = Standard_True,
                     const Standard_Boolean ConcatBSplines = Standard_False);
   
   //! Initializes with a shape and necessary flags.
   //! It does not perform unification.
   //! If you intend to nullify the History place holder do it after
   //! initialization.
   Standard_EXPORT void Initialize
                    (const TopoDS_Shape& aShape,
                     const Standard_Boolean UnifyEdges = Standard_True,
                     const Standard_Boolean UnifyFaces = Standard_True,
                     const Standard_Boolean ConcatBSplines = Standard_False);
   
   //! Sets the flag defining whether it is allowed to create
   //! internal edges inside merged faces in the case of non-manifold
   //! topology. Without this flag merging through multi connected edge
   //! is forbidden. Default value is false.
   Standard_EXPORT void AllowInternalEdges (const Standard_Boolean theValue);
 
   //! Sets the shape for avoid merging of the faces/edges.
   //! This shape can be vertex or edge.
   //! If the shape is a vertex it forbids merging of connected edges.
   //! If the shape is a edge it forbids merging of connected faces.
   //! This method can be called several times to keep several shapes.
   Standard_EXPORT void KeepShape(const TopoDS_Shape& theShape);
 
   //! Sets the map of shapes for avoid merging of the faces/edges.
   //! It allows passing a ready to use map instead of calling many times
   //! the method KeepShape.
   Standard_EXPORT void KeepShapes(const TopTools_MapOfShape& theShapes);
 
   //! Sets the flag defining the behavior of the algorithm regarding 
   //! modification of input shape.
   //! If this flag is equal to True then the input (original) shape can't be
   //! modified during modification process. Default value is true.
   Standard_EXPORT void SetSafeInputMode(Standard_Boolean theValue);
 
   //! Sets the linear tolerance. It plays the role of chord error when
   //! taking decision about merging of shapes. Default value is Precision::Confusion().
   void SetLinearTolerance(const Standard_Real theValue)
   {
     myLinTol = theValue;
   }
 
   //! Sets the angular tolerance. If two shapes form a connection angle greater than 
   //! this value they will not be merged. Default value is Precision::Angular().
   void SetAngularTolerance(const Standard_Real theValue)
   {
     myAngTol = (theValue < Precision::Angular() ? Precision::Angular() : theValue);
   }
 
   //! Performs unification and builds the resulting shape.
   Standard_EXPORT void Build();
   
   //! Gives the resulting shape
   const TopoDS_Shape& Shape() const
   {
     return myShape;
   }
 
   //! Returns the history of the processed shapes.
   const Handle(BRepTools_History)& History() const
   {
     return myHistory;
   }
 
   //! Returns the history of the processed shapes.
   Handle(BRepTools_History)& History()
   {
     return myHistory;
   }
 
   DEFINE_STANDARD_RTTIEXT(ShapeUpgrade_UnifySameDomain,Standard_Transient)
 
 protected:
 
   struct SubSequenceOfEdges;
 
 protected:
 
   //! This method makes if possible a common face from each
   //! group of faces lying on coincident surfaces
   Standard_EXPORT void UnifyFaces();
 
   //! This method makes if possible a common edge from each
   //! group of smothly connected edges, which are common for the same couple of faces
   Standard_EXPORT void UnifyEdges();
 
   void IntUnifyFaces(const TopoDS_Shape& theInpShape,
                      const TopTools_IndexedDataMapOfShapeListOfShape& theGMapEdgeFaces,
                      const DataMapOfShapeMapOfShape& theGMapFaceShells,
                      const TopTools_MapOfShape& theFreeBoundMap);
 
   //! Splits the sequence of edges into the sequence of chains
   Standard_Boolean MergeEdges(TopTools_SequenceOfShape& SeqEdges,
                               const TopTools_IndexedDataMapOfShapeListOfShape& theVFmap,
                               NCollection_Sequence<SubSequenceOfEdges>& SeqOfSubSeqOfEdges,
                               const TopTools_MapOfShape& NonMergVrt);
 
   //! Tries to unify the sequence of edges with the set of
   //! another edges which lies on the same geometry
   Standard_Boolean MergeSeq(TopTools_SequenceOfShape& SeqEdges,
                             const TopTools_IndexedDataMapOfShapeListOfShape& theVFmap,
                             const TopTools_MapOfShape& nonMergVert);
 
   //! Merges a sequence of edges into one edge if possible
   Standard_Boolean MergeSubSeq(const TopTools_SequenceOfShape& theChain,
                                const TopTools_IndexedDataMapOfShapeListOfShape& theVFmap,
                                TopoDS_Edge& OutEdge);
 
   //! Unifies the pcurve of the chain into one pcurve of the edge
   void UnionPCurves(const TopTools_SequenceOfShape& theChain,
                     TopoDS_Edge& theEdge);
 
   //! Fills the history of the modifications during the operation.
   Standard_EXPORT void FillHistory();
 
 private:
 
   //! Generates sub-sequences of edges from sequence of edges.
   //! Edges from each subsequences can be merged into the one edge.
   static void generateSubSeq (const TopTools_SequenceOfShape& anInpEdgeSeq,
                               NCollection_Sequence<SubSequenceOfEdges>& SeqOfSubSeqOfEdges,
                               Standard_Boolean IsClosed, double theAngTol, double theLinTol,
                               const TopTools_MapOfShape& AvoidEdgeVrt,
                               const TopTools_IndexedDataMapOfShapeListOfShape& theVFmap);
 
 private:
 
   TopoDS_Shape myInitShape;
   Standard_Real myLinTol;
   Standard_Real myAngTol;
   Standard_Boolean myUnifyFaces;
   Standard_Boolean myUnifyEdges;
   Standard_Boolean myConcatBSplines;
   Standard_Boolean myAllowInternal;
   Standard_Boolean mySafeInputMode;
   TopoDS_Shape myShape;
   Handle(ShapeBuild_ReShape) myContext;
   TopTools_MapOfShape myKeepShapes;
   DataMapOfFacePlane myFacePlaneMap;
   TopTools_IndexedDataMapOfShapeListOfShape myEFmap;
   TopTools_DataMapOfShapeShape myFaceNewFace;
 
   Handle(BRepTools_History) myHistory; //!< The history.
 };
 
 #endif // _ShapeUpgrade_UnifySameDomain_HeaderFile

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