/* ----------------------------------------------------------------------
    This is the

    ██╗     ██╗ ██████╗  ██████╗  ██████╗ ██╗  ██╗████████╗███████╗
    ██║     ██║██╔════╝ ██╔════╝ ██╔════╝ ██║  ██║╚══██╔══╝██╔════╝
    ██║     ██║██║  ███╗██║  ███╗██║  ███╗███████║   ██║   ███████╗
    ██║     ██║██║   ██║██║   ██║██║   ██║██╔══██║   ██║   ╚════██║
    ███████╗██║╚██████╔╝╚██████╔╝╚██████╔╝██║  ██║   ██║   ███████║
    ╚══════╝╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═╝   ╚═╝   ╚══════╝®

    DEM simulation engine, released by
    DCS Computing Gmbh, Linz, Austria
    http://www.dcs-computing.com, office@dcs-computing.com

    LIGGGHTS® is part of CFDEM®project:
    http://www.liggghts.com | http://www.cfdem.com

    Core developer and main author:
    Christoph Kloss, christoph.kloss@dcs-computing.com

    LIGGGHTS® is open-source, distributed under the terms of the GNU Public
    License, version 2 or later. It is distributed in the hope that it will
    be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You should have
    received a copy of the GNU General Public License along with LIGGGHTS®.
    If not, see http://www.gnu.org/licenses . See also top-level README
    and LICENSE files.

    LIGGGHTS® and CFDEM® are registered trade marks of DCS Computing GmbH,
    the producer of the LIGGGHTS® software and the CFDEM®coupling software
    See http://www.cfdem.com/terms-trademark-policy for details.

-------------------------------------------------------------------------
    Contributing author and copyright for this file:

    Christoph Kloss (DCS Computing GmbH, Linz, JKU Linz)
    Philippe Seil (JKU Linz)

    Copyright 2012-     DCS Computing GmbH, Linz
    Copyright 2009-2012 JKU Linz
------------------------------------------------------------------------- */

#ifndef LMP_TRI_MESH_H
#define LMP_TRI_MESH_H

#include "surface_mesh.h"
#include "atom.h"
#include "math_extra_liggghts.h"
#include "tri_line.h"
#ifdef TRI_LINE_ACTIVE_FLAG
#include "math_extra_dist_lineTriangle.h"
#endif
#include <fstream>

namespace LAMMPS_NS
{
  
  typedef SurfaceMesh<3,5> SurfaceMeshBase;

  class TriMesh : public SurfaceMeshBase
  {
      public:

        TriMesh(LAMMPS *lmp);
        virtual ~TriMesh();

        double resolveTriSphereContact(int iPart, int nTri, double rSphere, double *cSphere, double *delta);
        double resolveTriSphereContactBary(int iPart, int nTri, double rSphere, double *cSphere,
                                           double *contactPoint,double *bary);

        bool resolveTriSphereNeighbuild(int nTri, double rSphere, double *cSphere, double treshold);

        #ifdef TRI_LINE_ACTIVE_FLAG
        // Extra for Line Contact Calculation ********
        double resolveTriSegmentContact    (int iPart, int nTri, double *line, double *cLine, double length, double cylRadius,
                                            double *delta, double &segmentParameter);
        double resolveTriSegmentContactBary(int iPart, int nTri, double *line, double *cLine, double length, double cylRadius,
                                            double *delta, double  &segmentParameter, double *bary);
        bool resolveTriSegmentNeighbuild(int nTri, double *line, double *cLine, double length, double cylRadius, double treshold);
        // Extra for Line Contact Calculation ********
        #endif

        int generateRandomOwnedGhost(double *pos);
        int generateRandomSubbox(double *pos);

        virtual int generateRandomOwnedGhostWithin(double *pos,double delta);

      protected:

        double calcArea(int n);
        bool isInElement(double *pos,int i);

      private:

        inline double precision_trimesh()
        { return MultiNodeMesh<3>::precision(); }

        double calcDist(double *cs, double *closestPoint, double *en0);
        double calcDistToPlane(double *p, double *pPlane, double *nPlane);

        double resolveCornerContactBary(int iTri, int iNode, bool obtuse,
                                    double *p, double *delta, double *bary);
        double resolveEdgeContactBary(int iTri, int iEdge, double *p, double *delta, double *bary);
        double resolveFaceContactBary(int iTri, double *p, double *node0ToSphereCenter, double *delta);

  };

  // *************************************
  #include "tri_mesh_I.h"
  #ifdef TRI_LINE_ACTIVE_FLAG
  #include "tri_mesh_I_line.h"
  #endif
  // *************************************

} /* LAMMPS_NS */
#endif /* TRIMESH_H_ */
