/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2016 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 "volFields.H"
#include "surfaceFields.H"
#include "fvcGrad.H"
#include "coupledFvPatchFields.H"
#include "surfaceInterpolate.H"

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

template<class Type, class PhiLimiter>
Foam::tmp<Foam::surfaceScalarField>
Foam::PhiScheme<Type, PhiLimiter>::limiter
(
    const GeometricField<Type, fvPatchField, volMesh>& phi
) const
{
    const fvMesh& mesh = this->mesh();

    tmp<surfaceScalarField> tLimiter
    (
        new surfaceScalarField
        (
            IOobject
            (
                "PhiLimiter",
                mesh.time().timeName(),
                mesh
            ),
            mesh,
            dimless
        )
    );
    surfaceScalarField& Limiter = tLimiter.ref();

    const surfaceScalarField& CDweights = mesh.surfaceInterpolation::weights();

    const surfaceVectorField& Sf = mesh.Sf();
    const surfaceScalarField& magSf = mesh.magSf();

    const labelUList& owner = mesh.owner();
    const labelUList& neighbour = mesh.neighbour();

    tmp<surfaceScalarField> tUflux = this->faceFlux_;

    if (this->faceFlux_.dimensions() == dimDensity*dimVelocity*dimArea)
    {
        const volScalarField& rho =
            phi.db().objectRegistry::template lookupObject<volScalarField>
            ("rho");

        tUflux = this->faceFlux_/fvc::interpolate(rho);
    }
    else if (this->faceFlux_.dimensions() != dimVelocity*dimArea)
    {
        FatalErrorInFunction
            << "dimensions of faceFlux are not correct"
            << exit(FatalError);
    }

    const surfaceScalarField& Uflux = tUflux();

    scalarField& pLimiter = Limiter.primitiveFieldRef();

    forAll(pLimiter, face)
    {
        pLimiter[face] = PhiLimiter::limiter
        (
            CDweights[face],
            Uflux[face],
            phi[owner[face]],
            phi[neighbour[face]],
            Sf[face],
            magSf[face]
        );
    }


    surfaceScalarField::Boundary& bLimiter =
        Limiter.boundaryFieldRef();

    forAll(bLimiter, patchi)
    {
        scalarField& pLimiter = bLimiter[patchi];

        if (bLimiter[patchi].coupled())
        {
            const scalarField& pCDweights = CDweights.boundaryField()[patchi];
            const vectorField& pSf = Sf.boundaryField()[patchi];
            const scalarField& pmagSf = magSf.boundaryField()[patchi];
            const scalarField& pFaceFlux = Uflux.boundaryField()[patchi];

            const Field<Type> pphiP
            (
                phi.boundaryField()[patchi].patchInternalField()
            );
            const Field<Type> pphiN
            (
                phi.boundaryField()[patchi].patchNeighbourField()
            );

            forAll(pLimiter, face)
            {
                pLimiter[face] = PhiLimiter::limiter
                (
                    pCDweights[face],
                    pFaceFlux[face],
                    pphiP[face],
                    pphiN[face],
                    pSf[face],
                    pmagSf[face]
                );
            }
        }
        else
        {
            pLimiter = 1.0;
        }
    }

    return tLimiter;
}


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