// Created on: 1999-04-08
// Created by: Fabrice SERVANT
// Copyright (c) 1999 Matra Datavision
// Copyright (c) 1999-2014 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 _IntPolyh_Couple_HeaderFile
#define _IntPolyh_Couple_HeaderFile

#include "Standard.hxx"
#include "Standard_DefineAlloc.hxx"
#include "Standard_Handle.hxx"

#include "Standard_Integer.hxx"
#include "Standard_Real.hxx"
#include "Standard_HashUtils.hxx"

//! The class represents the couple of indices with additional
//! characteristics such as analyzed flag and an angle.
//! In IntPolyh_MaillageAffinage algorithm the class is used as a
//! couple of interfering triangles with the intersection angle.
class IntPolyh_Couple
{
public:
  DEFINE_STANDARD_ALLOC

  //! Constructor
  IntPolyh_Couple()
      : myIndex1(-1),
        myIndex2(-1),
        myAnalyzed(false),
        myAngle(-2.0)
  {
  }

  //! Constructor
  IntPolyh_Couple(const int theTriangle1, const int theTriangle2, const double theAngle = -2.0)
      : myIndex1(theTriangle1),
        myIndex2(theTriangle2),
        myAnalyzed(false),
        myAngle(theAngle)
  {
  }

  //! Returns the first index
  int FirstValue() const { return myIndex1; }

  //! Returns the second index
  int SecondValue() const { return myIndex2; }

  //! Returns TRUE if the couple has been analyzed
  bool IsAnalyzed() const { return myAnalyzed; }

  //! Returns the angle
  double Angle() const { return myAngle; }

  //! Sets the triangles
  void SetCoupleValue(const int theInd1, const int theInd2)
  {
    myIndex1 = theInd1;
    myIndex2 = theInd2;
  }

  //! Sets the analyzed flag
  void SetAnalyzed(const bool theAnalyzed) { myAnalyzed = theAnalyzed; }

  //! Sets the angle
  void SetAngle(const double theAngle) { myAngle = theAngle; }

  //! Returns true if the Couple is equal to <theOther>
  bool IsEqual(const IntPolyh_Couple& theOther) const
  {
    return (myIndex1 == theOther.myIndex1 && myIndex2 == theOther.myIndex2)
           || (myIndex1 == theOther.myIndex2 && myIndex2 == theOther.myIndex1);
  }

  //! Returns true if the Couple is equal to <theOther>
  bool operator==(const IntPolyh_Couple& theOther) const { return IsEqual(theOther); }

  // Dump
  Standard_EXPORT void Dump(const int v) const;

private:
  int    myIndex1;
  int    myIndex2;
  bool   myAnalyzed;
  double myAngle;
};

namespace std
{
template <>
struct hash<IntPolyh_Couple>
{
  size_t operator()(const IntPolyh_Couple& theCouple) const noexcept
  {
    // Combine two int values into a single hash value.
    int aCombination[2]{theCouple.FirstValue(), theCouple.SecondValue()};
    if (aCombination[0] > aCombination[1])
    {
      std::swap(aCombination[0], aCombination[1]);
    }
    return opencascade::hashBytes(aCombination, sizeof(aCombination));
  }
};
} // namespace std

#endif // _IntPolyh_Couple_HeaderFile