// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2015 Qingnan Zhou <qnzhou@gmail.com>
// 
// This Source Code Form is subject to the terms of the Mozilla Public License 
// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
// obtain one at http://mozilla.org/MPL/2.0/.
//
#ifndef IGL_COPYLEFT_CGAL_EXTRACT_CELLS_H
#define IGL_COPYLEFT_CGAL_EXTRACT_CELLS_H

#include "../../igl_inline.h"
#include <Eigen/Core>
#include <vector>

namespace igl {
  namespace copyleft
  {
    namespace cgal
    {
      /// Extract connected 3D space partitioned by mesh (V, F).
      ///
      /// @param[in] V  #V by 3 array of vertices.
      /// @param[in] F  #F by 3 array of faces.
      /// @param[in] P  #F list of patch indices.
      /// @param[in] uE    #uE by 2 list of vertex_indices, represents undirected edges.
      /// @param[in] EMAP  #F*3 list of indices into uE.
      /// @param[in] uEC  #uE+1 list of cumsums of directed edges sharing each unique edge
      /// @param[in] uEE  #E list of indices into E (see `igl::unique_edge_map`)
      /// @param[out] cells  #F by 2 array of cell indices.  cells(i,0) represents the
      ///          cell index on the positive side of face i, and cells(i,1)
      ///          represents cell index of the negqtive side.
      ///          By convension cell with index 0 is the infinite cell.
      /// @return the number of cells
      template<
        typename DerivedV,
        typename DerivedF,
        typename DerivedP,
        typename DeriveduE,
        typename DerivedEMAP,
        typename DeriveduEC,
        typename DeriveduEE,
        typename DerivedC >
      IGL_INLINE size_t extract_cells(
        const Eigen::PlainObjectBase<DerivedV>& V,
        const Eigen::PlainObjectBase<DerivedF>& F,
        const Eigen::PlainObjectBase<DerivedP>& P,
        const Eigen::PlainObjectBase<DeriveduE>& uE,
        const Eigen::PlainObjectBase<DerivedEMAP>& EMAP,
        const Eigen::PlainObjectBase<DeriveduEC>& uEC,
        const Eigen::PlainObjectBase<DeriveduEE>& uEE,
        Eigen::PlainObjectBase<DerivedC>& cells);
      /// \overload
      template<
        typename DerivedV,
        typename DerivedF,
        typename DerivedC >
      IGL_INLINE size_t extract_cells(
        const Eigen::PlainObjectBase<DerivedV>& V,
        const Eigen::PlainObjectBase<DerivedF>& F,
        Eigen::PlainObjectBase<DerivedC>& cells);
    }
  }
}

#ifndef IGL_STATIC_LIBRARY
#  include "extract_cells.cpp"
#endif
#endif