/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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/>.

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

#include "writePatch.H"
#include "OFstream.H"
#include "vtkWriteOps.H"
#include "primitiveFacePatch.H"

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

void Foam::vtkWriteOps::writePatch
(
    const bool binary,
    const word& setName,
    const primitiveFacePatch& fp,
    const word& fieldName,
    labelList& fieldValues,
    const fileName& fileName
)
{
    std::ofstream pStream(fileName.c_str());

    pStream
        << "# vtk DataFile Version 2.0" << std::endl
        << setName << std::endl;
    if (binary)
    {
        pStream << "BINARY" << std::endl;
    }
    else
    {
        pStream << "ASCII" << std::endl;
    }
    pStream << "DATASET POLYDATA" << std::endl;


    //------------------------------------------------------------------
    //
    // Write topology
    //
    //------------------------------------------------------------------


    // Write points and faces as polygons

    pStream << "POINTS " << fp.nPoints() << " float" << std::endl;

    DynamicList<floatScalar> ptField(3*fp.nPoints());

    vtkWriteOps::insert(fp.localPoints(), ptField);

    vtkWriteOps::write(pStream, binary, ptField);


    label nFaceVerts = 0;

    forAll(fp.localFaces(), facei)
    {
        nFaceVerts += fp.localFaces()[facei].size() + 1;
    }
    pStream << "POLYGONS " << fp.size() << ' ' << nFaceVerts
        << std::endl;


    DynamicList<label> vertLabels(nFaceVerts);

    forAll(fp.localFaces(), facei)
    {
        const face& f = fp.localFaces()[facei];

        vertLabels.append(f.size());

        vtkWriteOps::insert(f, vertLabels);
    }
    vtkWriteOps::write(pStream, binary, vertLabels);


    //-----------------------------------------------------------------
    //
    // Write data
    //
    //-----------------------------------------------------------------

    // Write faceID

    pStream
        << "CELL_DATA " << fp.size() << std::endl
        << "FIELD attributes 1" << std::endl;

    // Cell ids first
    pStream << fieldName << " 1 " << fp.size() << " int" << std::endl;

    vtkWriteOps::write(pStream, binary, fieldValues);
}


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