/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2012 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 "DESModelRegions.H"
#include "volFields.H"
#include "compressible/turbulenceModel/turbulenceModel.H"
#include "compressible/LES/DESModel/DESModel.H"
#include "incompressible/turbulenceModel/turbulenceModel.H"
#include "incompressible/LES/DESModel/DESModel.H"

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

defineTypeNameAndDebug(Foam::DESModelRegions, 0);


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

void Foam::DESModelRegions::makeFile()
{
    // Create the output file if not already created
    if (outputFilePtr_.empty())
    {
        if (debug)
        {
            Info<< "Creating output file." << endl;
        }

        // File update
        if (Pstream::master())
        {
            fileName outputDir;
            word startTimeName =
                obr_.time().timeName(obr_.time().startTime().value());

            if (Pstream::parRun())
            {
                // Put in undecomposed case (Note: gives problems for
                // distributed data running)
                outputDir =
                    obr_.time().path()/".."/name_/startTimeName;
            }
            else
            {
                outputDir = obr_.time().path()/name_/startTimeName;
            }

            // Create directory if does not exist
            mkDir(outputDir);

            // Open new file at start up
            outputFilePtr_.reset(new OFstream(outputDir/(type() + ".dat")));

            // Add headers to output data
            outputFilePtr_() << "# DES model region coverage (% volume)" << nl
                << "# time " << token::TAB << "LES" << token::TAB << "RAS"
                << endl;
        }
    }
}


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

Foam::DESModelRegions::DESModelRegions
(
    const word& name,
    const objectRegistry& obr,
    const dictionary& dict,
    const bool loadFromFiles
)
:
    name_(name),
    obr_(obr),
    active_(true),
    log_(false),
    outputFilePtr_(NULL)
{
    // Check if the available mesh is an fvMesh, otherwise deactivate
    if (!isA<fvMesh>(obr_))
    {
        active_ = false;
        WarningIn
        (
            "DESModelRegions::DESModelRegions"
            "("
                "const word&, "
                "const objectRegistry&, "
                "const dictionary&, "
                "const bool"
            ")"
        )   << "No fvMesh available, deactivating." << nl
            << endl;
    }

    makeFile();

    read(dict);
}


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

Foam::DESModelRegions::~DESModelRegions()
{}


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

void Foam::DESModelRegions::read(const dictionary& dict)
{
    if (active_)
    {
        log_ = dict.lookupOrDefault<Switch>("log", false);
    }
}


void Foam::DESModelRegions::execute()
{
    // Do nothing - only valid on write
}


void Foam::DESModelRegions::end()
{
    // Do nothing - only valid on write
}


void Foam::DESModelRegions::write()
{
    typedef incompressible::turbulenceModel icoModel;
    typedef incompressible::DESModel icoDESModel;

    typedef compressible::turbulenceModel cmpModel;
    typedef compressible::DESModel cmpDESModel;

    if (active_)
    {
        const fvMesh& mesh = refCast<const fvMesh>(obr_);

        if (log_)
        {
            Info<< type() << " output:" << nl;
        }

        tmp<volScalarField> result;

        label DESpresent = false;
        if (mesh.foundObject<icoModel>("turbulenceModel"))
        {
            const icoModel& model =
                mesh.lookupObject<icoModel>("turbulenceModel");

            if (isA<icoDESModel>(model))
            {
                const icoDESModel& des =
                    dynamic_cast<const icoDESModel&>(model);
                result = des.LESRegion();
                DESpresent = true;
            }
        }
        else if (mesh.foundObject<cmpModel>("turbulenceModel"))
        {
            const cmpModel& model =
                mesh.lookupObject<cmpModel>("turbulenceModel");

            if (isA<cmpDESModel>(model))
            {
                const cmpDESModel& des =
                    dynamic_cast<const cmpDESModel&>(model);
                result = des.LESRegion();
                DESpresent = true;
            }
        }

        if (DESpresent)
        {
            scalar prc =
                gSum(result().internalField()*mesh.V())/gSum(mesh.V())*100.0;

            if (Pstream::master())
            {
                outputFilePtr_() << obr_.time().timeName() << token::TAB
                    << prc << token::TAB << 100.0 - prc << endl;
            }
    
            if (log_)
            {
                Info<< "    LES = " << prc << " % (volume)" << nl
                    << "    RES = " << 100.0 - prc << " % (volume)" << nl
                    << endl;
            }
        }
        else
        {
            if (log_)
            {
                Info<< "    No DES turbulence model found in database" << nl
                    << endl;
            }
        }
    }
}


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