/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2021 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 "STARCDsurfaceFormat.H"
#include "ListOps.H"
#include "polygonTriangulate.H"

// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

template<class Face>
inline void Foam::fileFormats::STARCDsurfaceFormat<Face>::writeShell
(
    Ostream& os,
    const Face& f,
    const label cellId,
    const label cellTableId
)
{
    os  << cellId                    // includes 1 offset
        << ' ' << starcdShellShape_  // 3(shell) shape
        << ' ' << f.size()
        << ' ' << cellTableId
        << ' ' << starcdShellType_;  // 4(shell)

    // primitives have <= 8 vertices, but prevent overrun anyhow
    // indent following lines for ease of reading
    label count = 0;
    forAll(f, fp)
    {
        if ((count % 8) == 0)
        {
            os  << nl << "  " << cellId;
        }
        os  << ' ' << f[fp] + 1;
        count++;
    }
    os  << endl;
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

template<class Face>
Foam::fileFormats::STARCDsurfaceFormat<Face>::STARCDsurfaceFormat
(
    const fileName& filename
)
{
    read(filename);
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class Face>
bool Foam::fileFormats::STARCDsurfaceFormat<Face>::read
(
    const fileName& filename
)
{
    const bool mustTriangulate = this->isTri();
    this->clear();

    fileName baseName = filename.lessExt();

    // read cellTable names (if possible)
    Map<word> cellTableLookup;

    {
        IFstream is(baseName + ".inp");
        if (is.good())
        {
            cellTableLookup = readInpCellTable(is);
        }
    }


    // STAR-CD index of points
    List<label> pointId;

    // read points from .vrt file
    readPoints
    (
        IFstream(baseName + ".vrt")(),
        this->storedPoints(),
        pointId
    );

    // Build inverse mapping (STAR-CD pointId -> index)
    Map<label> mapPointId(2*pointId.size());
    forAll(pointId, i)
    {
        mapPointId.insert(pointId[i], i);
    }
    pointId.clear();

    //
    // read .cel file
    // ~~~~~~~~~~~~~~
    IFstream is(baseName + ".cel");
    if (!is.good())
    {
        FatalErrorInFunction
            << "Cannot read file " << is.name()
            << exit(FatalError);
    }

    readHeader(is, "PROSTAR_CELL");

    // Create a triangulation engine
    polygonTriangulate triEngine;

    DynamicList<Face>  dynFaces;
    DynamicList<label> dynZones;
    DynamicList<word>  dynNames;
    DynamicList<label> dynSizes;
    Map<label> lookup;

    // assume the cellTableIds are not intermixed
    bool sorted = true;
    label zoneI = 0;

    label lineLabel, shapeId, nLabels, cellTableId, typeId;
    DynamicList<label> vertexLabels(64);

    while ((is >> lineLabel).good())
    {
        is >> shapeId >> nLabels >> cellTableId >> typeId;

        vertexLabels.clear();
        vertexLabels.reserve(nLabels);

        // read indices - max 8 per line
        for (label i = 0; i < nLabels; ++i)
        {
            label vrtId;
            if ((i % 8) == 0)
            {
               is >> lineLabel;
            }
            is >> vrtId;

            // convert original vertex id to point label
            vertexLabels.append(mapPointId[vrtId]);
        }

        if (typeId == starcdShellType_)
        {
            // Convert groupID into zoneID
            Map<label>::const_iterator fnd = lookup.find(cellTableId);
            if (fnd != lookup.end())
            {
                if (zoneI != fnd())
                {
                    // cellTableIds are intermixed
                    sorted = false;
                }
                zoneI = fnd();
            }
            else
            {
                zoneI = dynSizes.size();
                lookup.insert(cellTableId, zoneI);

                Map<word>::const_iterator tableNameIter =
                    cellTableLookup.find(cellTableId);

                if (tableNameIter == cellTableLookup.end())
                {
                    dynNames.append
                    (
                        word("cellTable_") + ::Foam::name(cellTableId)
                    );
                }
                else
                {
                    dynNames.append(tableNameIter());
                }

                dynSizes.append(0);
            }

            SubList<label> vertices(vertexLabels, vertexLabels.size());
            if (mustTriangulate && nLabels > 3)
            {
                triEngine.triangulate
                (
                    UIndirectList<point>(this->points(), vertices)
                );

                forAll(triEngine.triPoints(), trii)
                {
                    dynFaces.append(triEngine.triPoints(trii, vertices));
                }
            }
            else
            {
                dynFaces.append(Face(vertices));
                dynZones.append(zoneI);
                dynSizes[zoneI]++;
            }
        }
    }
    mapPointId.clear();

    this->sortFacesAndStore(move(dynFaces), move(dynZones), sorted);

    // add zones, culling empty ones
    this->addZones(dynSizes, dynNames, true);
    return true;
}


template<class Face>
void Foam::fileFormats::STARCDsurfaceFormat<Face>::write
(
    const fileName& filename,
    const MeshedSurfaceProxy<Face>& surf
)
{
    const pointField& pointLst = surf.points();
    const List<Face>&  faceLst = surf.faces();
    const List<label>& faceMap = surf.faceMap();

    const List<surfZone>& zones =
    (
        surf.surfZones().empty()
      ? surfaceFormatsCore::oneZone(faceLst)
      : surf.surfZones()
    );

    const bool useFaceMap = (surf.useFaceMap() && zones.size() > 1);


    fileName baseName = filename.lessExt();

    writePoints(OFstream(baseName + ".vrt")(), pointLst);
    OFstream os(baseName + ".cel");
    writeHeader(os, "CELL");

    label faceIndex = 0;
    forAll(zones, zoneI)
    {
        const surfZone& zone = zones[zoneI];

        if (useFaceMap)
        {
            forAll(zone, localFacei)
            {
                const Face& f = faceLst[faceMap[faceIndex++]];
                writeShell(os, f, faceIndex, zoneI + 1);
            }
        }
        else
        {
            forAll(zone, localFacei)
            {
                const Face& f = faceLst[faceIndex++];
                writeShell(os, f, faceIndex, zoneI + 1);
            }
        }
    }

    // write simple .inp file
    writeCase
    (
        OFstream(baseName + ".inp")(),
        pointLst,
        faceLst.size(),
        zones
    );
}


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