// Copyright (c) 2005  Tel-Aviv University (Israel).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Boolean_set_operations_2/include/CGAL/Gps_segment_traits_2.h $
// $Id: include/CGAL/Gps_segment_traits_2.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Baruch Zukerman <baruchzu@post.tau.ac.il>

#ifndef CGAL_GPS_SEGMENT_TRAITS_2_H
#define CGAL_GPS_SEGMENT_TRAITS_2_H

#include <CGAL/license/Boolean_set_operations_2.h>

#include <CGAL/disable_warnings.h>

#include <CGAL/Arr_segment_traits_2.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/Polygon_with_holes_2.h>
#include <CGAL/Boolean_set_operations_2/Polygon_2_curve_iterator.h>
#include <CGAL/Boolean_set_operations_2/Gps_polygon_validation.h>
#include <CGAL/Boolean_set_operations_2/Gps_traits_adaptor.h>

namespace CGAL {

template <typename Kernel_,
          typename Container_ = std::vector<typename Kernel_::Point_2>,
          typename ArrSegmentTraits = Arr_segment_traits_2<Kernel_> >
class Gps_segment_traits_2 : public ArrSegmentTraits {
  typedef ArrSegmentTraits                                               Base;
  typedef Gps_segment_traits_2<Kernel_, Container_, ArrSegmentTraits>    Self;

public:
  // Polygon_2 type is required by GeneralPolygonSetTraits Concept
  typedef CGAL::Polygon_2<Kernel_, Container_>  Polygon_2;

  // Backward compatibility
  typedef Polygon_2                             General_polygon_2;

  // Polygon_with_holes_2 can be a simple polygon , with holes that are
  // entirely inside him , or some vertices of the polygon and its holes
  // may overlap.

  // Polygon_with_holes_2 type required by GeneralPolygonSetTraits Concept.
  typedef CGAL::Polygon_with_holes_2<Kernel_, Container_>
                                                Polygon_with_holes_2;
  // Backward compatibility
  typedef Polygon_with_holes_2                  General_polygon_with_holes_2;

  typedef typename Base::X_monotone_curve_2     X_monotone_curve_2;

  typedef Polygon_2_curve_iterator<X_monotone_curve_2, Polygon_2>
                                                Curve_const_iterator;

  typedef typename Polygon_with_holes_2::Hole_const_iterator
                                                Hole_const_iterator;
  typedef typename Base::Point_2                Point_2;


  /*!
   * A functor for constructing a polygon from a range of segments.
   */
  class Construct_polygon_2 {
    typedef Gps_segment_traits_2<Kernel_, Container_, ArrSegmentTraits> Self;
    typedef Gps_traits_adaptor<Self>            Traits_adaptor;

    /*! The traits (in case it has state) */
    const Traits_adaptor* m_traits;

  public:
    /*! Constructor
     * \param traits the traits (in case it has state)
     */
    Construct_polygon_2(const Self* traits) :
      m_traits(static_cast<const Traits_adaptor*>(traits))
    {}

    template <typename XCurveIterator>
    void operator()(XCurveIterator begin, XCurveIterator end, Polygon_2& pgn)
      const
    {
      typename Traits_adaptor::Construct_vertex_2 ctr_v =
        m_traits->construct_vertex_2_object();

      for (XCurveIterator itr = begin; itr != end; ++itr)
        pgn.push_back(ctr_v(*itr, 1));
    }
  };

  Construct_polygon_2 construct_polygon_2_object() const
  {
    return Construct_polygon_2(this);
  }

  /*!
   * A functor for scanning all segments that form a polygon boundary.
   */
  class Construct_curves_2 {
  public:
    std::pair<Curve_const_iterator, Curve_const_iterator>
    operator()(const Polygon_2& pgn) const {
      Curve_const_iterator c_begin(&pgn, pgn.vertex_pairs_begin());
      Curve_const_iterator c_end(&pgn, pgn.vertex_pairs_end());
      return (std::make_pair(c_begin, c_end));
    }
  };

  Construct_curves_2 construct_curves_2_object() const
  {
    return Construct_curves_2();
  }

  // Added Functionality from GeneralPolygonWithHoles Concept to the traits.

  /* A functor for constructing the outer boundary of a polygon with holes
   */
  class Construct_outer_boundary {
  public:
    Polygon_2 operator()(const Polygon_with_holes_2& pol_wh) const
    { return pol_wh.outer_boundary(); }
  };

  Construct_outer_boundary construct_outer_boundary_object() const
  { return Construct_outer_boundary(); }

  /* typedef from Polygon_with_holes_2.
   * Hole_const_iterator nested type is required by
   * GeneralPolygonWithHoles2 concept
   */

  /* A functor for constructing the container of holes of a polygon with holes.
   * It returns the begin/end iterators for the holes
   */
  class Construct_holes {
  public:
    std::pair<Hole_const_iterator, Hole_const_iterator>
    operator()(const Polygon_with_holes_2& pol_wh) const
    { return std::make_pair(pol_wh.holes_begin(), pol_wh.holes_end()); }
  };

  Construct_holes construct_holes_object() const
  { return Construct_holes(); }

  /* A functor for constructing a Polygon_with_holes from a polygon (and
   * possibly a range of holes).
   *
   * constructs a general polygon with holes using a given general polygon
   * outer as the outer boundary and a given range of holes. If outer is an
   * empty general polygon, then an unbounded polygon with holes will be
   * created. The holes must be contained inside the outer boundary, and the
   * polygons representing the holes must be strictly simple and pairwise
   * disjoint, except perhaps at the vertices.
   */
  class Construct_polygon_with_holes_2 {
  public:
    Polygon_with_holes_2 operator()(const Polygon_2& pgn_boundary) const
    { return Polygon_with_holes_2(pgn_boundary); }

    template <typename HolesInputIterator>
    Polygon_with_holes_2 operator()(const Polygon_2& pgn_boundary,
                                    HolesInputIterator h_begin,
                                    HolesInputIterator h_end) const
    { return Polygon_with_holes_2(pgn_boundary, h_begin,h_end); }
  };

  Construct_polygon_with_holes_2 construct_polygon_with_holes_2_object() const
  {
    return Construct_polygon_with_holes_2();
  }

  //functor returns true if the outer boundary is unbounded, and false otherwise.
  class Is_unbounded {
  public:
    bool operator()(const Polygon_with_holes_2& pol_wh) const
    { return pol_wh.is_unbounded(); }
  };

  Is_unbounded is_unbounded_object() const { return Is_unbounded(); }
};

} //namespace CGAL

#include <CGAL/enable_warnings.h>

#endif

