/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2018 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 "STARCDedgeFormat.H"
#include "ListOps.H"
#include "clock.H"
#include "PackedBoolList.H"
#include "IStringStream.H"

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

inline void Foam::fileFormats::STARCDedgeFormat::writeLines
(
    Ostream& os,
    const edgeList& edges
)
{
    writeHeader(os, "CELL");

    forAll(edges, edgeI)
    {
        const edge& e = edges[edgeI];
        const label cellId = edgeI + 1;

        os  << cellId                    // includes 1 offset
            << ' ' << starcdLineShape_   // 2(line) shape
            << ' ' << e.size()
            << ' ' << 401                // arbitrary value
            << ' ' << starcdLineType_;   // 5(line)

        os  << nl << "  " << cellId << "  "
            << (e[0]+1) << "  " << (e[1]+1) << nl;
    }
}


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

void Foam::fileFormats::STARCDedgeFormat::writeCase
(
    Ostream& os,
    const pointField& pointLst,
    const label nEdges
)
{
    word caseName = os.name().lessExt().name();

    os  << "! STAR-CD file written " << clock::dateTime().c_str() << nl
        << "! " << pointLst.size() << " points, " << nEdges << " lines" << nl
        << "! case " << caseName << nl
        << "! ------------------------------" << nl;

//     forAll(zoneLst, zoneI)
//     {
//         os  << "ctable " << zoneI + 1 << " line" << nl
//             << "ctname " << zoneI + 1 << " "
//             << zoneLst[zoneI].name() << nl;
//     }

    os  << "! ------------------------------" << nl
        << "*set icvo mxv - 1" << nl
        << "vread " << caseName << ".vrt icvo,,,coded" << nl
        << "cread " << caseName << ".cel icvo,,,add,coded" << nl
        << "*set icvo" << nl
        << "! end" << nl;

    os.flush();
}


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

Foam::fileFormats::STARCDedgeFormat::STARCDedgeFormat
(
    const fileName& filename
)
{
    read(filename);
}


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

bool Foam::fileFormats::STARCDedgeFormat::read
(
    const fileName& filename
)
{
    clear();

    fileName baseName = filename.lessExt();

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

    // read points from .vrt file
    readPoints
    (
        IFstream(baseName + ".vrt")(),
        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();

    // note which points were really used and which can be culled
    PackedBoolList usedPoints(points().size());

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

    readHeader(is, "PROSTAR_CELL");

    DynamicList<edge>  dynEdges;

    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 == starcdLineType_)
        {
            if (vertexLabels.size() >= 2)
            {
                dynEdges.append(edge(vertexLabels[0], vertexLabels[1]));

                usedPoints.set(vertexLabels[0]);
                usedPoints.set(vertexLabels[1]);
            }
        }
    }

    mapPointId.clear();

    // not all the points were used, cull them accordingly
    if (unsigned(points().size()) != usedPoints.count())
    {
        label nUsed = 0;

        pointField& pts = storedPoints();
        forAll(pts, pointi)
        {
            if (usedPoints.get(pointi))
            {
                if (nUsed != pointi)
                {
                    pts[nUsed] = pts[pointi];
                }

                // map prev -> new id
                mapPointId.set(pointi, nUsed);

                ++nUsed;
            }
        }

        pts.setSize(nUsed);

        // renumber edge vertices
        forAll(dynEdges, edgeI)
        {
            edge& e = dynEdges[edgeI];

            e[0] = mapPointId[e[0]];
            e[1] = mapPointId[e[1]];
        }
    }


    storedEdges().transfer(dynEdges);

    return true;
}


void Foam::fileFormats::STARCDedgeFormat::write
(
    const fileName& filename,
    const edgeMesh& mesh
)
{
    const pointField& pointLst = mesh.points();
    const edgeList& edgeLst = mesh.edges();

    fileName baseName = filename.lessExt();

    writePoints(OFstream(baseName + ".vrt")(), pointLst);
    writeLines(OFstream(baseName + ".cel")(), edgeLst);

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


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