/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2025 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 "fvcSurfaceIntegrate.H"
#include "fvMesh.H"
#include "extrapolatedCalculatedFvPatchFields.H"

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

namespace Foam
{

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

namespace fvc
{

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

template<class Type>
void surfaceIntegrate
(
    Field<Type>& ivf,
    const SurfaceField<Type>& ssf
)
{
    const fvMesh& mesh = ssf.mesh();

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

    const Field<Type>& issf = ssf;

    forAll(owner, facei)
    {
        ivf[owner[facei]] += issf[facei];
        ivf[neighbour[facei]] -= issf[facei];
    }

    forAll(mesh.boundary(), patchi)
    {
        const labelUList& pFaceCells =
            mesh.boundary()[patchi].faceCells();

        const fvsPatchField<Type>& pssf = ssf.boundaryField()[patchi];

        forAll(mesh.boundary()[patchi], facei)
        {
            ivf[pFaceCells[facei]] += pssf[facei];
        }
    }

    ivf /= mesh.Vsc();
}


template<class Type>
tmp<VolInternalField<Type>>
surfaceIntegrate
(
    const SurfaceField<Type>& ssf
)
{
    const fvMesh& mesh = ssf.mesh();

    tmp<VolInternalField<Type>> tvf
    (
        VolInternalField<Type>::New
        (
            "surfaceIntegrate("+ssf.name()+')',
            mesh,
            dimensioned<Type>
            (
                "0",
                ssf.dimensions()/dimVolume,
                Zero
            )
        )
    );
    VolInternalField<Type>& vf = tvf.ref();

    surfaceIntegrate(vf.primitiveFieldRef(), ssf);

    return tvf;
}


template<class Type>
tmp<VolInternalField<Type>>
surfaceIntegrate
(
    const tmp<SurfaceField<Type>>& tssf
)
{
    tmp<VolInternalField<Type>> tvf
    (
        fvc::surfaceIntegrate(tssf())
    );
    tssf.clear();
    return tvf;
}


template<class Type>
tmp<VolField<Type>>
surfaceIntegrateExtrapolate
(
    const SurfaceField<Type>& ssf
)
{
    const fvMesh& mesh = ssf.mesh();

    tmp<VolField<Type>> tvf
    (
        VolField<Type>::New
        (
            "surfaceIntegrate("+ssf.name()+')',
            mesh,
            dimensioned<Type>
            (
                "0",
                ssf.dimensions()/dimVolume,
                Zero
            ),
            extrapolatedCalculatedFvPatchField<Type>::typeName
        )
    );
    VolField<Type>& vf = tvf.ref();

    surfaceIntegrate(vf.primitiveFieldRef(), ssf);
    vf.correctBoundaryConditions();

    return tvf;
}


template<class Type>
tmp<VolField<Type>>
surfaceIntegrateExtrapolate
(
    const tmp<SurfaceField<Type>>& tssf
)
{
    tmp<VolField<Type>> tvf
    (
        fvc::surfaceIntegrateExtrapolate(tssf())
    );
    tssf.clear();
    return tvf;
}


template<class Type>
tmp<VolInternalField<Type>> surfaceSum(const SurfaceField<Type>& ssf)
{
    const fvMesh& mesh = ssf.mesh();

    tmp<VolInternalField<Type>> tvf
    (
        VolInternalField<Type>::New
        (
            "surfaceSum("+ssf.name()+')',
            mesh,
            dimensioned<Type>("0", ssf.dimensions(), Zero)
        )
    );
    VolInternalField<Type>& vf = tvf.ref();

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

    forAll(owner, facei)
    {
        vf[owner[facei]] += ssf[facei];
        vf[neighbour[facei]] += ssf[facei];
    }

    forAll(mesh.boundary(), patchi)
    {
        const labelUList& pFaceCells =
            mesh.boundary()[patchi].faceCells();

        const fvsPatchField<Type>& pssf = ssf.boundaryField()[patchi];

        forAll(mesh.boundary()[patchi], facei)
        {
            vf[pFaceCells[facei]] += pssf[facei];
        }
    }

    return tvf;
}


template<class Type>
tmp<VolInternalField<Type>> surfaceSum
(
    const tmp<SurfaceField<Type>>& tssf
)
{
    tmp<VolInternalField<Type>> tvf = surfaceSum(tssf());
    tssf.clear();
    return tvf;
}


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

} // End namespace fvc

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

} // End namespace Foam

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