/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     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 "surfaceToPoint.H"
#include "polyMesh.H"
#include "meshSearch.H"
#include "triSurfaceSearch.H"
#include "cpuTime.H"

#include "addToRunTimeSelectionTable.H"

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

namespace Foam
{

defineTypeNameAndDebug(surfaceToPoint, 0);

addToRunTimeSelectionTable(topoSetSource, surfaceToPoint, word);

addToRunTimeSelectionTable(topoSetSource, surfaceToPoint, istream);

}


Foam::topoSetSource::addToUsageTable Foam::surfaceToPoint::usage_
(
    surfaceToPoint::typeName,
    "\n    Usage: surfaceToPoint <surface> <near> <inside> <outside>\n\n"
    "    <surface> name of triSurface\n"
    "    <near> scalar; include points with coordinate <= near to surface\n"
    "    <inside> boolean; whether to include points on opposite side of"
    " surface normal\n"
    "    <outside> boolean; whether to include points on this side of"
    " surface normal\n\n"
);


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

void Foam::surfaceToPoint::combine(topoSet& set, const bool add) const
{
    cpuTime timer;

    triSurface surf(surfName_);

    Info<< "    Read surface from " << surfName_
        << " in = "<< timer.cpuTimeIncrement() << " s" << endl << endl;

    // Construct search engine on surface
    triSurfaceSearch querySurf(surf);

    if (includeInside_ || includeOutside_)
    {
        boolList pointInside(querySurf.calcInside(mesh_.points()));

        forAll(pointInside, pointI)
        {
            bool isInside = pointInside[pointI];

            if ((isInside && includeInside_) || (!isInside && includeOutside_))
            {
                addOrDelete(set, pointI, add);
            }
        }
    }

    if (nearDist_ > 0)
    {
        const pointField& meshPoints = mesh_.points();

        // Box dimensions to search in octree.
        const vector span(nearDist_, nearDist_, nearDist_);

        forAll(meshPoints, pointI)
        {
            const point& pt = meshPoints[pointI];

            pointIndexHit inter = querySurf.nearest(pt, span);

            if (inter.hit() && (mag(inter.hitPoint() - pt) < nearDist_))
            {
                addOrDelete(set, pointI, add);
            }
        }
    }
}


void Foam::surfaceToPoint::checkSettings() const
{
    if (nearDist_ < 0 && !includeInside_ && !includeOutside_)
    {
        FatalErrorIn("surfaceToPoint:checkSettings()")
            << "Illegal point selection specification."
            << " Result would be either all or no points." << endl
            << "Please set one of includeInside or includeOutside"
            << " to true, set nearDistance to a value > 0"
            << exit(FatalError);
    }
}


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

// Construct from components
Foam::surfaceToPoint::surfaceToPoint
(
    const polyMesh& mesh,
    const fileName& surfName,
    const scalar nearDist,
    const bool includeInside,
    const bool includeOutside
)
:
    topoSetSource(mesh),
    surfName_(surfName),
    nearDist_(nearDist),
    includeInside_(includeInside),
    includeOutside_(includeOutside)
{
    checkSettings();
}


// Construct from dictionary
Foam::surfaceToPoint::surfaceToPoint
(
    const polyMesh& mesh,
    const dictionary& dict
)
:
    topoSetSource(mesh),
    surfName_(dict.lookup("file")),
    nearDist_(readScalar(dict.lookup("nearDistance"))),
    includeInside_(readBool(dict.lookup("includeInside"))),
    includeOutside_(readBool(dict.lookup("includeOutside")))
{
    checkSettings();
}


// Construct from Istream
Foam::surfaceToPoint::surfaceToPoint
(
    const polyMesh& mesh,
    Istream& is
)
:
    topoSetSource(mesh),
    surfName_(checkIs(is)),
    nearDist_(readScalar(checkIs(is))),
    includeInside_(readBool(checkIs(is))),
    includeOutside_(readBool(checkIs(is)))
{
    checkSettings();
}


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

Foam::surfaceToPoint::~surfaceToPoint()
{}


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

void Foam::surfaceToPoint::applyToSet
(
    const topoSetSource::setAction action,
    topoSet& set
) const
{
    if ( (action == topoSetSource::NEW) || (action == topoSetSource::ADD))
    {
        Info<< "    Adding points in relation to surface " << surfName_
            << " ..." << endl;

        combine(set, true);
    }
    else if (action == topoSetSource::DELETE)
    {
        Info<< "    Removing points in relation to surface " << surfName_
            << " ..." << endl;

        combine(set, false);
    }
}


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