/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2020-2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM 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.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Application
    foamToSurface

Group
    grpMeshConversionUtilities

Description
    Extract boundaries from an OpenFOAM mesh and write in a surface format

Usage
    \b foamToSurface [OPTION]

    Options:
      - \par -scale \<factor\>
        Specify an alternative geometry scaling factor.
        E.g. use \b 1000 to scale \em [m] to \em [mm].

      - \par -tri
        Triangulate surface.

\*---------------------------------------------------------------------------*/

#include "argList.H"
#include "timeSelector.H"
#include "Time.H"
#include "polyMesh.H"
#include "IOdictionary.H"
#include "MeshedSurfaces.H"

using namespace Foam;

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Extract boundaries from an OpenFOAM mesh and write in a surface format"
    );
    argList::noParallel();
    argList::addArgument("output", "The output surface file");

    timeSelector::addOptions();

    argList::addOption
    (
        "scale",
        "factor",
        "Geometry scaling factor - default is 1"
    );
    argList::addBoolOption
    (
        "tri",
        "Triangulate surface"
    );

    #include "setRootCase.H"

    auto exportName = args.get<fileName>(1);

    const scalar scaleFactor = args.getOrDefault<scalar>("scale", 0);
    const bool doTriangulate = args.found("tri");

    fileName exportBase = exportName.lessExt();
    word exportExt = exportName.ext();

    if (!meshedSurface::canWriteType(exportExt, true))
    {
        return 1;
    }

    #include "createTime.H"
    instantList timeDirs = timeSelector::select0(runTime, args);
    #include "createPolyMesh.H"

    forAll(timeDirs, timeI)
    {
        runTime.setTime(timeDirs[timeI], timeI);
        #include "getTimeIndex.H"

        polyMesh::readUpdateState state = mesh.readUpdate();

        if (timeI == 0 || state != polyMesh::UNCHANGED)
        {
            if (state == polyMesh::UNCHANGED)
            {
                exportName = exportBase + "." + exportExt;
            }
            else
            {
                exportName =
                    exportBase + '_' + runTime.timeName() + "." + exportExt;
            }

            meshedSurface surf(mesh.boundaryMesh());
            surf.scalePoints(scaleFactor);

            Info<< "writing " << exportName;
            if (doTriangulate)
            {
                Info<< " triangulated";
                surf.triangulate();
            }

            if (scaleFactor <= 0)
            {
                Info<< " without scaling" << endl;
            }
            else
            {
                Info<< " with scaling " << scaleFactor << endl;
            }
            surf.write(exportName);
        }

        Info<< nl << endl;
    }

    Info<< "End\n" << endl;

    return 0;
}

// ************************************************************************* //
