/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 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 "velocityLaplacianFvMotionSolver.H"
#include "motionDiffusivity.H"
#include "fvmLaplacian.H"
#include "addToRunTimeSelectionTable.H"
#include "volPointInterpolation.H"

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

namespace Foam
{
    defineTypeNameAndDebug(velocityLaplacianFvMotionSolver, 0);

    addToRunTimeSelectionTable
    (
        fvMotionSolver,
        velocityLaplacianFvMotionSolver,
        dictionary
    );
}


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

Foam::velocityLaplacianFvMotionSolver::velocityLaplacianFvMotionSolver
(
    const polyMesh& mesh,
    Istream&
)
:
    fvMotionSolver(mesh),
    pointMotionU_
    (
        IOobject
        (
            "pointMotionU",
            fvMesh_.time().timeName(),
            fvMesh_,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        pointMesh::New(fvMesh_)
    ),
    cellMotionU_
    (
        IOobject
        (
            "cellMotionU",
            mesh.time().timeName(),
            mesh,
            IOobject::READ_IF_PRESENT,
            IOobject::AUTO_WRITE
        ),
        fvMesh_,
        dimensionedVector
        (
            "cellMotionU",
            pointMotionU_.dimensions(),
            vector::zero
        ),
        cellMotionBoundaryTypes<vector>(pointMotionU_.boundaryField())
    ),
    diffusivityPtr_
    (
        motionDiffusivity::New(*this, lookup("diffusivity"))
    )
{}


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

Foam::velocityLaplacianFvMotionSolver::~velocityLaplacianFvMotionSolver()
{}


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

Foam::tmp<Foam::pointField>
Foam::velocityLaplacianFvMotionSolver::curPoints() const
{
    volPointInterpolation::New(fvMesh_).interpolate
    (
        cellMotionU_,
        pointMotionU_
    );

    tmp<pointField> tcurPoints
    (
        fvMesh_.points()
      + fvMesh_.time().deltaTValue()*pointMotionU_.internalField()
    );

    twoDCorrectPoints(tcurPoints());

    return tcurPoints;
}


void Foam::velocityLaplacianFvMotionSolver::solve()
{
    // The points have moved so before interpolation update
    // the fvMotionSolver accordingly
    movePoints(fvMesh_.points());

    diffusivityPtr_->correct();
    pointMotionU_.boundaryField().updateCoeffs();

    Foam::solve
    (
        fvm::laplacian
        (
            diffusivityPtr_->operator()(),
            cellMotionU_,
            "laplacian(diffusivity,cellMotionU)"
        )
    );
}


void Foam::velocityLaplacianFvMotionSolver::updateMesh
(
    const mapPolyMesh& mpm
)
{
    fvMotionSolver::updateMesh(mpm);

    // Update diffusivity. Note two stage to make sure old one is de-registered
    // before creating/registering new one.
    diffusivityPtr_.reset(NULL);
    diffusivityPtr_ = motionDiffusivity::New(*this, lookup("diffusivity"));
}


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