// Created on: 2007-12-08
// Created by: Alexander GRIGORIEV
// Copyright (c) 2007-2014 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 Poly_CoherentNode_HeaderFile
#define Poly_CoherentNode_HeaderFile

#include "gp_XYZ.hxx"
#include "Poly_CoherentTriPtr.hxx"
#include "Precision.hxx"

class NCollection_BaseAllocator;

/**
 * Node of coherent triangulation. Contains:
 * <ul>
 * <li>Coordinates of a 3D point defining the node location</li>
 * <li>2D point coordinates</li>
 * <li>List of triangles that use this Node</li>
 * <li>Integer index, normally the index of the node in the original
 *     triangulation</li>
 * </ul>
 */

class Poly_CoherentNode : public gp_XYZ
{
public:
  // ---------- PUBLIC METHODS ----------

  /**
   * Empty constructor.
   */
  inline Poly_CoherentNode()
      : gp_XYZ(0., 0., 0.),
        myTriangles(nullptr),
        myIndex(-1)
  {
    myUV[0] = Precision::Infinite();
    myUV[1] = Precision::Infinite();
  }

  /**
   * Constructor.
   */
  inline Poly_CoherentNode(const gp_XYZ& thePnt)
      : gp_XYZ(thePnt),
        myTriangles(nullptr),
        myIndex(-1)
  {
    myUV[0]     = Precision::Infinite();
    myUV[1]     = Precision::Infinite();
    myNormal[0] = 0.f;
    myNormal[1] = 0.f;
    myNormal[2] = 0.f;
  }

  /**
   * Set the UV coordinates of the Node.
   */
  inline void SetUV(const double theU, const double theV)
  {
    myUV[0] = theU;
    myUV[1] = theV;
  }

  /**
   * Get U coordinate of the Node.
   */
  inline double GetU() const { return myUV[0]; }

  /**
   * Get V coordinate of the Node.
   */
  inline double GetV() const { return myUV[1]; }

  /**
   * Define the normal vector in the Node.
   */
  Standard_EXPORT void SetNormal(const gp_XYZ& theVector);

  /**
   * Query if the Node contains a normal vector.
   */
  inline bool HasNormal() const
  {
    return ((myNormal[0] * myNormal[0] + myNormal[1] * myNormal[1] + myNormal[2] * myNormal[2])
            > Precision::Confusion());
  }

  /**
   * Get the stored normal in the node.
   */
  inline gp_XYZ GetNormal() const { return gp_XYZ(myNormal[0], myNormal[1], myNormal[2]); }

  /**
   * Set the value of node Index.
   */
  inline void SetIndex(const int theIndex) { myIndex = theIndex; }

  /**
   * Get the value of node Index.
   */
  inline int GetIndex() const { return myIndex; }

  /**
   * Check if this is a free node, i.e., a node without a single
   * incident triangle.
   */
  inline bool IsFreeNode() const noexcept { return myTriangles == nullptr; }

  /**
   * Reset the Node to void.
   */
  Standard_EXPORT void Clear(const occ::handle<NCollection_BaseAllocator>&);

  /**
   * Connect a triangle to this Node.
   */
  Standard_EXPORT void AddTriangle(const Poly_CoherentTriangle&                  theTri,
                                   const occ::handle<NCollection_BaseAllocator>& theA);

  /**
   * Disconnect a triangle from this Node.
   */
  Standard_EXPORT bool RemoveTriangle(const Poly_CoherentTriangle&                  theTri,
                                      const occ::handle<NCollection_BaseAllocator>& theA);

  /**
   * Create an iterator of incident triangles.
   */
  inline Poly_CoherentTriPtr::Iterator TriangleIterator() const { return *myTriangles; }

  Standard_EXPORT void Dump(Standard_OStream& theStream) const;

  //   /**
  //    * Destructor.
  //    */
  //   Standard_EXPORT virtual ~Poly_CoherentNode ();

private:
  // ---------- PRIVATE FIELDS ----------

  double               myUV[2];
  Poly_CoherentTriPtr* myTriangles;
  int                  myIndex;
  float                myNormal[3];
};

#endif