/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2008 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 2 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, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Class
    Foam::cellDistFuncs

Description
    Collection of functions used in wall distance calculation.

SourceFiles
    cellDistFuncs.C

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

#ifndef cellDistFuncs_H
#define cellDistFuncs_H

#include "scalarField.H"
#include "HashSet.H"
#include "Map.H"
#include "wordList.H"
#include "scalarField.H"
#include "point.H"
#include "primitivePatch.H"
#include "className.H"

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

namespace Foam
{

// Forward declaration of classes
class polyMesh;
class polyPatch;
class polyBoundaryMesh;

/*---------------------------------------------------------------------------*\
                           Class cellDistFuncs Declaration
\*---------------------------------------------------------------------------*/

class cellDistFuncs
{
    // Private Member Data

        //- Reference to mesh
        const polyMesh& mesh_;


    // Private Member Functions

        //- Search for element in first n elements of labelList. Return index
        //  or -1.
        static label findIndex(const label n, const labelList&, const label);


        //- Disallow default bitwise copy construct
        cellDistFuncs(const cellDistFuncs&);

        //- Disallow default bitwise assignment
        void operator=(const cellDistFuncs&);

public:

    ClassName("cellDistFuncs");

    // Constructors

        //- Construct from mesh
        cellDistFuncs(const polyMesh& mesh);


    // Member Functions

        //- Access mesh
        const polyMesh& mesh() const
        {
            return mesh_;
        }

        //- Get patchIDs of named patches
        labelHashSet getPatchIDs(const wordList&) const;

        //- Get patchIDs of certain type (e.g. 'processorPolyPatch')
        labelHashSet getPatchIDs(const word&) const;

        //- Calculate smallest true distance (and face index)
        //  from pt to faces wallFaces.
        //  For efficiency reasons we still pass in patch instead of extracting
        //  it from mesh_
        scalar smallestDist
        (
            const point& p,
            const polyPatch& patch,
            const label nWallFaces,
            const labelList& wallFaces,
            label& meshFaceI
        ) const;

        //- Get faces sharing point with face on patch
        label getPointNeighbours
        (
            const primitivePatch&,
            const label patchFaceI,
            labelList&
        ) const;

        //- Size of largest patch (out of supplied subset of patches)
        label maxPatchSize(const labelHashSet& patchIDs) const;

        //- Sum of patch sizes (out of supplied subset of patches). 
        //  Used in sizing arrays.
        label sumPatchSize(const labelHashSet& patchIDs) const;

        //- Correct all cells connected to boundary (via face). Sets values in
        //  wallDistCorrected. Sets nearest wallface in nearestFace.
        void correctBoundaryFaceCells
        (
            const labelHashSet& patchIDs,
            scalarField& wallDistCorrected,
            Map<label>& nearestFace
        ) const;


        //- Correct all cells connected to wall (via point). Sets values in
        //  wallDistCorrected. Uses/sets nearest wallFace in nearestFace.
        void correctBoundaryPointCells
        (
            const labelHashSet& patchIDs,
            scalarField& wallDistCorrected,
            Map<label>& nearestFace
        ) const;
};


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

} // End namespace Foam

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

#endif

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