// Copyright (c) 2013 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 _BRepMesh_IncrementalMesh_HeaderFile
#define _BRepMesh_IncrementalMesh_HeaderFile

#include "BRepMesh_DiscretRoot.hxx"
#include "IMeshTools_Context.hxx"
#include "Standard_NumericError.hxx"

//! Builds the mesh of a shape with respect of their
//! correctly triangulated parts
class BRepMesh_IncrementalMesh : public BRepMesh_DiscretRoot
{
public: //! @name mesher API
  //! Default constructor
  Standard_EXPORT BRepMesh_IncrementalMesh();

  //! Destructor
  Standard_EXPORT ~BRepMesh_IncrementalMesh() override;

  //! Constructor.
  //! Automatically calls method Perform.
  //! @param theShape shape to be meshed.
  //! @param theLinDeflection linear deflection.
  //! @param isRelative if TRUE deflection used for discretization of
  //! each edge will be <theLinDeflection> * <size of edge>. Deflection
  //! used for the faces will be the maximum deflection of their edges.
  //! @param theAngDeflection angular deflection.
  //! @param isInParallel if TRUE shape will be meshed in parallel.
  Standard_EXPORT BRepMesh_IncrementalMesh(const TopoDS_Shape& theShape,
                                           const double        theLinDeflection,
                                           const bool          isRelative       = false,
                                           const double        theAngDeflection = 0.5,
                                           const bool          isInParallel     = false);

  //! Constructor.
  //! Automatically calls method Perform.
  //! @param theShape shape to be meshed.
  //! @param theParameters - parameters of meshing
  Standard_EXPORT BRepMesh_IncrementalMesh(
    const TopoDS_Shape&          theShape,
    const IMeshTools_Parameters& theParameters,
    const Message_ProgressRange& theRange = Message_ProgressRange());

  //! Performs meshing of the shape.
  Standard_EXPORT void Perform(
    const Message_ProgressRange& theRange = Message_ProgressRange()) override;

  //! Performs meshing using custom context;
  Standard_EXPORT void Perform(const occ::handle<IMeshTools_Context>& theContext,
                               const Message_ProgressRange& theRange = Message_ProgressRange());

public: //! @name accessing to parameters.
  //! Returns meshing parameters
  const IMeshTools_Parameters& Parameters() const { return myParameters; }

  //! Returns modifiable meshing parameters
  IMeshTools_Parameters& ChangeParameters() { return myParameters; }

  //! Returns modified flag.
  bool IsModified() const { return myModified; }

  //! Returns accumulated status flags faced during meshing.
  int GetStatusFlags() const { return myStatus; }

private:
  //! Initializes specific parameters
  void initParameters()
  {
    if (myParameters.Deflection < Precision::Confusion())
    {
      throw Standard_NumericError(
        "BRepMesh_IncrementalMesh::initParameters : invalid parameter value");
    }
    if (myParameters.DeflectionInterior < Precision::Confusion())
    {
      myParameters.DeflectionInterior = myParameters.Deflection;
    }

    if (myParameters.MinSize < Precision::Confusion())
    {
      myParameters.MinSize =
        (std::max)(IMeshTools_Parameters::RelMinSize()
                     * (std::min)(myParameters.Deflection, myParameters.DeflectionInterior),
                   Precision::Confusion());
    }

    if (myParameters.Angle < Precision::Angular())
    {
      throw Standard_NumericError(
        "BRepMesh_IncrementalMesh::initParameters : invalid parameter value");
    }
    if (myParameters.AngleInterior < Precision::Angular())
    {
      myParameters.AngleInterior = 2.0 * myParameters.Angle;
    }
  }

public: //! @name plugin API
  //! Plugin interface for the Mesh Factories.
  //! Initializes meshing algorithm with the given parameters.
  //! @param theShape shape to be meshed.
  //! @param theLinDeflection linear deflection.
  //! @param theAngDeflection angular deflection.
  //! @param[out] theAlgo pointer to initialized algorithm.
  Standard_EXPORT static int Discret(const TopoDS_Shape&    theShape,
                                     const double           theLinDeflection,
                                     const double           theAngDeflection,
                                     BRepMesh_DiscretRoot*& theAlgo);

  //! Returns multi-threading usage flag set by default in
  //! Discret() static method (thus applied only to Mesh Factories).
  Standard_EXPORT static bool IsParallelDefault();

  //! Setup multi-threading usage flag set by default in
  //! Discret() static method (thus applied only to Mesh Factories).
  Standard_EXPORT static void SetParallelDefault(const bool isInParallel);

  DEFINE_STANDARD_RTTIEXT(BRepMesh_IncrementalMesh, BRepMesh_DiscretRoot)

protected:
  IMeshTools_Parameters myParameters;
  bool                  myModified;
  int                   myStatus;
};

#endif