/**
 * \file
 * \copyright
 * Copyright (c) 2012-2021, OpenGeoSys Community (http://www.opengeosys.org)
 *            Distributed under a Modified BSD License.
 *              See accompanying file LICENSE.txt or
 *              http://www.opengeosys.org/project/license
 *
 */

#include "TetRule4.h"

#include <array>

#include "BaseLib/Logging.h"

#include "MathLib/GeometricBasics.h"

#include "MeshLib/Node.h"
#include "Tri.h"
#include "Line.h"

namespace MeshLib {

const unsigned TetRule4::face_nodes[4][3] =
{
    {0, 2, 1}, // Face 0
    {0, 1, 3}, // Face 1
    {1, 2, 3}, // Face 2
    {2, 0, 3}  // Face 3
};

const unsigned TetRule4::edge_nodes[6][2] =
{
    {0, 1}, // Edge 0
    {1, 2}, // Edge 1
    {0, 2}, // Edge 2
    {0, 3}, // Edge 3
    {1, 3}, // Edge 4
    {2, 3}  // Edge 5
};

const Element* TetRule4::getFace(const Element* e, unsigned i)
{
    if (i<n_faces)
    {
        std::array<Node*,3> nodes{};
        for (unsigned j = 0; j < 3; j++)
        {
            nodes[j] = const_cast<Node*>(e->getNode(face_nodes[i][j]));
        }
        return new Tri(nodes, e->getID());
    }
    ERR("Error in MeshLib::Element::getFace() - Index {:d} does not exist.", i);
    return nullptr;
}

double TetRule4::computeVolume(Node const* const* _nodes)
{
    return MathLib::calcTetrahedronVolume(*_nodes[0], *_nodes[1], *_nodes[2], *_nodes[3]);
}

bool TetRule4::isPntInElement(Node const* const* nodes,
                              MathLib::Point3d const& pnt, double eps)
{
    return MathLib::isPointInTetrahedron(pnt, *nodes[0], *nodes[1], *nodes[2],
                                         *nodes[3], eps);
}

unsigned TetRule4::identifyFace(Node const* const* _nodes, Node* nodes[3])
{
    for (unsigned i=0; i<4; i++)
    {
        unsigned flag(0);
        for (unsigned j = 0; j < 3; j++)
        {
            for (unsigned k = 0; k < 3; k++)
            {
                if (_nodes[face_nodes[i][j]] == nodes[k])
                {
                    flag++;
                }
            }
        }
        if (flag == 3)
        {
            return i;
        }
    }
    return std::numeric_limits<unsigned>::max();
}

ElementErrorCode TetRule4::validate(const Element* e)
{
    ElementErrorCode error_code;
    error_code[ElementErrorFlag::ZeroVolume] = hasZeroVolume(*e);
    error_code[ElementErrorFlag::NodeOrder]  = !e->testElementNodeOrder();
    return error_code;
}

} // end namespace MeshLib