/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     |
    \\  /    A nd           | For copyright notice see file Copyright
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.

    foam-extend 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.

    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.

Application
    datToFoam

Description
    Reads in a datToFoam mesh file and outputs a points file.  Used in
    conjunction with blockMesh.

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

#include "argList.H"
#include "Time.H"
#include "IFstream.H"
#include "OFstream.H"
#include "meshTools.H"
#include "polyMesh.H"
#include "wallPolyPatch.H"
#include "symmetryPolyPatch.H"
#include "preservePatchTypes.H"
#include "cellShape.H"
#include "cellModeller.H"
#include "mergePoints.H"
#include "mathematicalConstants.H"

using namespace Foam;

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Main program:

int main(int argc, char *argv[])
{
    argList::noParallel();
    argList::validArgs.append("dat file");

    argList args(argc, argv);

    if (!args.check())
    {
         FatalError.exit();
    }

#   include "createTime.H"

    std::ifstream plot3dFile(args.args()[1].c_str());

    string line;
    std::getline(plot3dFile, line);
    std::getline(plot3dFile, line);

    IStringStream Istring(line);
    word block;
    string zoneName;
    token punctuation;
    label iPoints;
    label jPoints;

    Istring >> block;
    Istring >> block;
    Istring >> zoneName;
    Istring >> punctuation;
    Istring >> block;
    Istring >> iPoints;
    Istring >> block;
    Istring >> jPoints;

    Info<< "Number of vertices in i direction = " << iPoints << endl
        << "Number of vertices in j direction = " << jPoints << endl;

    // We ignore the first layer of points in i and j the biconic meshes
    label nPointsij = (iPoints - 1)*(jPoints - 1);

    pointField points(nPointsij, vector::zero);

    for (direction comp = 0; comp < 2; comp++)
    {
        label p(0);

        for (label j = 0; j < jPoints; j++)
        {
            for (label i = 0; i < iPoints; i++)
            {
                double coord;
                plot3dFile >> coord;

                // if statement ignores the first layer in i and j
                if(i>0 && j>0)
                {
                    points[p++][comp] = coord;
                }
            }
        }
    }

    // correct error in biconic meshes
    forAll(points, i)
    {
        if(points[i][1] < 1e-07)
        {
            points[i][1] = 0.0;
        }
    }

    pointField pointsWedge(nPointsij*2, vector::zero);

    fileName pointsFile(runTime.constantPath()/"points.tmp");
    OFstream pFile(pointsFile);

    scalar a(0.1*mathematicalConstant::pi/180.0);
    tensor rotateZ =
        tensor
        (
            1.0, 0.0, 0.0,
            0.0, 1.0, 0.0,
            0.0, -::sin(a), ::cos(a)
        );

    forAll(points, i)
    {
        pointsWedge[i] = (rotateZ & points[i]);
        pointsWedge[i+nPointsij] = cmptMultiply(vector(1.0, 1.0, -1.0), pointsWedge[i]);
    }

    Info << "Writing points to: " << nl
         << "    " << pointsFile << endl;
    pFile << pointsWedge;

    Info << "End" << endl;

    return 0;
}


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