////////////////////////////////////////////////////////////////////////////////
//
//  File: TetGenInterface.h
//
//  For more information, please see: http://www.nektar.info/
//
//  The MIT License
//
//  Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
//  Department of Aeronautics, Imperial College London (UK), and Scientific
//  Computing and Imaging Institute, University of Utah (USA).
//
//  Permission is hereby granted, free of charge, to any person obtaining a
//  copy of this software and associated documentation files (the "Software"),
//  to deal in the Software without restriction, including without limitation
//  the rights to use, copy, modify, merge, publish, distribute, sublicense,
//  and/or sell copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included
//  in all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
//  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//  DEALINGS IN THE SOFTWARE.
//
//  Description: class for interacting with tetgen
//
////////////////////////////////////////////////////////////////////////////////

#ifndef NEKTAR_MESHUTILS_EXTLIBINTERFACE_TETGENINTERFACE_H
#define NEKTAR_MESHUTILS_EXTLIBINTERFACE_TETGENINTERFACE_H

#include <memory>

#include <LibUtilities/Memory/NekMemoryManager.hpp>

#include <NekMesh/MeshElements/Mesh.h>
#include <NekMesh/MeshElements/Node.h>

#define TETLIBRARY
#include <tetgen.h>

namespace Nektar::NekMesh
{

/**
 * @brief Class for interacting with the external library TetGen.
 */
class TetGenInterface
{
public:
    friend class MemoryManager<TetGenInterface>;

    /**
     * @brief Default constructor
     */
    TetGenInterface(std::vector<std::array<NekDouble, 3>> holes)
    {
        m_holes = holes;
    }

    /**
     * @brief Assign parameters for meshing
     */
    void InitialMesh(std::map<int, NodeSharedPtr> tgidton,
                     std::vector<std::array<int, 3>> tri);

    /**
     * @brief Gets the locations of the Stiener points added by TetGen
     */
    void GetNewPoints(int num, std::vector<std::array<NekDouble, 3>> &newp);

    /**
     * @brief Refines a previously made tetmesh with node delta information
     *        from the Octree
     */
    void RefineMesh(std::map<int, NekDouble> delta);

    /**
     * @brief Get the list of connectivites of the nodes
     */
    std::vector<std::array<int, 4>> Extract();

    /**
     * @brief Clear previous mesh
     */
    void freetet();

private:
    /// TetGen objects
    tetgenio surface, output, input;

    /// Holes in volume
    std::vector<std::array<NekDouble, 3>> m_holes;
};

typedef std::shared_ptr<TetGenInterface> TetGenInterfaceSharedPtr;
} // namespace Nektar::NekMesh
#endif
