/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2015 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 "circleSet.H"
#include "sampledSet.H"
#include "meshSearch.H"
#include "DynamicList.H"
#include "polyMesh.H"
#include "addToRunTimeSelectionTable.H"
#include "word.H"
#include "mathematicalConstants.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
    defineTypeNameAndDebug(circleSet, 0);
    addToRunTimeSelectionTable(sampledSet, circleSet, word);
}


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

void Foam::circleSet::calcSamples
(
    DynamicList<point>& samplingPts,
    DynamicList<label>& samplingCells,
    DynamicList<label>& samplingFaces,
    DynamicList<label>& samplingSegments,
    DynamicList<scalar>& samplingCurveDist
) const
{
    static const string funcName =
    (
        "void circleSet::calcSamples"
        "("
            "DynamicList<point>&, "
            "DynamicList<label>&, "
            "DynamicList<label>&, "
            "DynamicList<label>&, "
            "DynamicList<scalar>&"
        ") const"
    );

    // set start point
    label cellI = searchEngine().findCell(startPoint_);
    if (cellI != -1)
    {
        samplingPts.append(startPoint_);
        samplingCells.append(cellI);
        samplingFaces.append(-1);
        samplingSegments.append(0);
        samplingCurveDist.append(0.0);
    }
    else
    {
        WarningInFunction
            << "Unable to find cell at point id " << 0
            << " at location " << startPoint_ << endl;
    }

    // add remaining points
    const scalar alpha = constant::mathematical::pi/180.0*dTheta_;
    const scalar sinAlpha = sin(alpha);
    const scalar cosAlpha = cos(alpha);

    // first axis
    vector axis1 = startPoint_ - origin_;
    const scalar radius = mag(axis1);

    if (mag(axis1 & circleAxis_) > SMALL)
    {
        WarningInFunction
            << "Vector defined by (startPoint - origin) not orthogonal to "
            << "circleAxis:" << nl
            << "    startPoint - origin = " << axis1 << nl
            << "    circleAxis          = " << circleAxis_ << nl
            << endl;
    }

    axis1 /= mag(axis1);

    scalar theta = dTheta_;
    label nPoint = 1;
    while (theta < 360)
    {
        axis1 = axis1*cosAlpha + (axis1^circleAxis_)*sinAlpha;
        axis1 /= mag(axis1);
        point pt = origin_ + radius*axis1;

        label cellI = searchEngine().findCell(pt);

        if (cellI != -1)
        {
            samplingPts.append(pt);
            samplingCells.append(cellI);
            samplingFaces.append(-1);
            samplingSegments.append(nPoint);
            samplingCurveDist.append
            (
                radius*constant::mathematical::pi/180.0*theta
            );

            nPoint++;
        }
        else
        {
            WarningInFunction
                << "Unable to find cell at point id " << nPoint
                << " at location " << pt << endl;
        }
        theta += dTheta_;
    }
}


void Foam::circleSet::genSamples()
{
    // Storage for sample points
    DynamicList<point> samplingPts;
    DynamicList<label> samplingCells;
    DynamicList<label> samplingFaces;
    DynamicList<label> samplingSegments;
    DynamicList<scalar> samplingCurveDist;

    calcSamples
    (
        samplingPts,
        samplingCells,
        samplingFaces,
        samplingSegments,
        samplingCurveDist
    );

    samplingPts.shrink();
    samplingCells.shrink();
    samplingFaces.shrink();
    samplingSegments.shrink();
    samplingCurveDist.shrink();

    setSamples
    (
        samplingPts,
        samplingCells,
        samplingFaces,
        samplingSegments,
        samplingCurveDist
    );
}


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

Foam::circleSet::circleSet
(
    const word& name,
    const polyMesh& mesh,
    const meshSearch& searchEngine,
    const word& axis,
    const point& origin,
    const vector& circleAxis,
    const point& startPoint,
    const scalar dTheta
)
:
    sampledSet(name, mesh, searchEngine, axis),
    origin_(origin),
    circleAxis_(circleAxis),
    startPoint_(startPoint),
    dTheta_(dTheta)
{
    genSamples();

    if (debug)
    {
        write(Info);
    }
}


Foam::circleSet::circleSet
(
    const word& name,
    const polyMesh& mesh,
    const meshSearch& searchEngine,
    const dictionary& dict
)
:
    sampledSet(name, mesh, searchEngine, dict),
    origin_(dict.lookup("origin")),
    circleAxis_(dict.lookup("circleAxis")),
    startPoint_(dict.lookup("startPoint")),
    dTheta_(readScalar(dict.lookup("dTheta")))
{
    // normalise circleAxis
    circleAxis_ /= mag(circleAxis_);

    genSamples();

    if (debug)
    {
        write(Info);
    }
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::circleSet::~circleSet()
{}


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

Foam::point Foam::circleSet::getRefPoint(const List<point>& pts) const
{
    return startPoint_;
}


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