// Begin License:
// Copyright (C) 2006-2008 Tobias Sargeant (tobias.sargeant@gmail.com).
// All rights reserved.
//
// This file is part of the Carve CSG Library (http://carve-csg.com/)
//
// This file may be used under the terms of the GNU General Public
// License version 2.0 as published by the Free Software Foundation
// and appearing in the file LICENSE.GPL2 included in the packaging of
// this file.
//
// This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
// INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE.
// End:


#pragma once

#include <carve/carve.hpp>

#include <carve/geom3d.hpp>
#include <carve/aabb.hpp>

#include <carve/polyhedron_base.hpp>

namespace carve {

  namespace csg {

    const double SLACK_FACTOR=1.0009765625;
    const unsigned FACE_SPLIT_THRESHOLD=50U;
    const unsigned EDGE_SPLIT_THRESHOLD=50U;
    const unsigned POINT_SPLIT_THRESHOLD=20U;
    const unsigned MAX_SPLIT_DEPTH=32;

    class Octree {

    public:
      class Node {
      private:
        Node(const Node &node); // undefined.
        Node &operator=(const Node &node); // undefined.

      public:
        Node *parent;
        Node *children[8];
        bool is_leaf;

        carve::geom3d::Vector min;
        carve::geom3d::Vector max;

        std::vector<const carve::poly::Geometry<3>::face_t *> faces;
        std::vector<const carve::poly::Geometry<3>::edge_t *> edges;
        std::vector<const carve::poly::Geometry<3>::vertex_t *> vertices;

        carve::geom3d::AABB aabb;

        Node();

        Node(const carve::geom3d::Vector &newMin, const carve::geom3d::Vector &newMax);
        Node(Node *p, double x1, double y1, double z1, double x2, double y2, double z2);

        ~Node();

        bool mightContain(const carve::poly::Geometry<3>::face_t &face);
        bool mightContain(const carve::poly::Geometry<3>::edge_t &edge);
        bool mightContain(const carve::poly::Geometry<3>::vertex_t &p);
        bool hasChildren();
        bool hasGeometry();

        template <class T>
        void putInside(const T &input, Node *child, T &output);

        bool split();
      };



      Node *root;



      struct no_filter {
        bool operator()(const carve::poly::Geometry<3>::edge_t *) { return true; }
        bool operator()(const carve::poly::Geometry<3>::face_t *) { return true; }
      };



      Octree();

      ~Octree();



      void setBounds(const carve::geom3d::Vector &min, const carve::geom3d::Vector &max);
      void setBounds(carve::geom3d::AABB aabb);



      void addEdges(const std::vector<carve::poly::Geometry<3>::edge_t > &edges);
      void addFaces(const std::vector<carve::poly::Geometry<3>::face_t > &faces);
      void addVertices(const std::vector<const carve::poly::Geometry<3>::vertex_t *> &vertices);



      static carve::geom3d::AABB makeAABB(const Node *node);



      void doFindEdges(const carve::geom::aabb<3> &aabb,
                       Node *node,
                       std::vector<const carve::poly::Geometry<3>::edge_t *> &out,
                       unsigned depth) const;
      void doFindEdges(const carve::geom3d::LineSegment &l,
                       Node *node,
                       std::vector<const carve::poly::Geometry<3>::edge_t *> &out,
                       unsigned depth) const;
      void doFindEdges(const carve::geom3d::Vector &v,
                       Node *node,
                       std::vector<const carve::poly::Geometry<3>::edge_t *> &out,
                       unsigned depth) const;
      void doFindFaces(const carve::geom::aabb<3> &aabb,
                       Node *node,
                       std::vector<const carve::poly::Geometry<3>::face_t *> &out,
                       unsigned depth) const;
      void doFindFaces(const carve::geom3d::LineSegment &l,
                       Node *node,
                       std::vector<const carve::poly::Geometry<3>::face_t *> &out,
                       unsigned depth) const;



      void doFindVerticesAllowDupes(const carve::geom3d::Vector &v,
                                    Node *node,
                                    std::vector<const carve::poly::Geometry<3>::vertex_t *> &out,
                                    unsigned depth) const;

      void findVerticesNearAllowDupes(const carve::geom3d::Vector &v,
                                      std::vector<const carve::poly::Geometry<3>::vertex_t *> &out) const;



      template<typename filter_t>
      void doFindEdges(const carve::poly::Geometry<3>::face_t &f, Node *node,
                       std::vector<const carve::poly::Geometry<3>::edge_t *> &out,
                       unsigned depth,
                       filter_t filter) const;

      template<typename filter_t>
      void findEdgesNear(const carve::poly::Geometry<3>::face_t &f,
                         std::vector<const carve::poly::Geometry<3>::edge_t *> &out,
                         filter_t filter) const;

      void findEdgesNear(const carve::poly::Geometry<3>::face_t &f,
                         std::vector<const carve::poly::Geometry<3>::edge_t *> &out) const {
        return findEdgesNear(f, out, no_filter());
      }



      void findEdgesNear(const carve::geom::aabb<3> &aabb, std::vector<const carve::poly::Geometry<3>::edge_t *> &out) const;
      void findEdgesNear(const carve::geom3d::LineSegment &l, std::vector<const carve::poly::Geometry<3>::edge_t *> &out) const;
      void findEdgesNear(const carve::poly::Geometry<3>::edge_t &e, std::vector<const carve::poly::Geometry<3>::edge_t *> &out) const;
      void findEdgesNear(const carve::geom3d::Vector &v, std::vector<const carve::poly::Geometry<3>::edge_t *> &out) const;



      void findFacesNear(const carve::geom::aabb<3> &aabb, std::vector<const carve::poly::Geometry<3>::face_t *> &out) const;
      void findFacesNear(const carve::geom3d::LineSegment &l, std::vector<const carve::poly::Geometry<3>::face_t *> &out) const;
      void findFacesNear(const carve::poly::Geometry<3>::edge_t &e, std::vector<const carve::poly::Geometry<3>::face_t *> &out) const;



      static void doSplit(int maxSplit, Node *node);



      template <typename FUNC>
      void doIterate(int level, Node *node, const FUNC &f) const;

      template <typename FUNC>
      void iterateNodes(const FUNC &f) const;



      void splitTree();

    };

  }
}