/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | Multiphase Code Repository by HZDR
  ======   //   ||  || ===//   | Website: https://doi.org/10.14278/rodare.767
  ||  ||  //    ||  // || \\   | License: GPL-3.0-or-later
  ==  == ====== ====   ==  ==  |
-------------------------------------------------------------------------------
License
    This file is part of the Multiphase Code Repository by HZDR.

    Copyright (C) 2025 by Helmholtz-Zentrum Dresden-Rossendorf e.V. (HZDR),
    Website: https://hzdr.de

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    computational fluid dynamics (CFD) from the OpenFOAM Foundation.
    Copyright (C) 2025 by OpenFOAM Foundation, Website: https://openfoam.org

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    files, which OpenFOAM Foundation files were modified, and which files were
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#include "addToRunTimeSelectionTable.H"
#include "fvcGrad.H"
#include "interfaceIndicatorMethod.H"

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

namespace Foam
{
    defineTypeNameAndDebug(interfaceIndicatorMethod, 0);
    defineRunTimeSelectionTable(interfaceIndicatorMethod, dictionary);
}


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

//- Provides default implementation for pure virtual function
Foam::tmp<Foam::volScalarField>
Foam::interfaceIndicatorMethod::interfaceIndicator
(
    const phaseModel& phase1,
    const phaseModel& phase2
) const
{
    NotImplemented;
    return tmp<volScalarField>(nullptr);
}


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

Foam::interfaceIndicatorMethod::interfaceIndicatorMethod
(
    const resolvedInterfaceSystem& resolvedInterface,
    const bool registerObject
)
:
    regIOobject
    (
        IOobject
        (
            typeName,
            resolvedInterface.mesh().time().name(),
            resolvedInterface.mesh(),
            IOobject::NO_READ,
            IOobject::NO_WRITE,
            registerObject
        )
    ),
    resolvedInterface_(resolvedInterface)
{}


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

Foam::interfaceIndicatorMethod::~interfaceIndicatorMethod()
{}


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

Foam::tmp<Foam::volScalarField>
Foam::interfaceIndicatorMethod::interfaceIndicator
(
    const phaseModel& phase
) const
{
    // Consider only interfaces between continuous phases
    if (!phase.continuous())
    {
        FatalErrorInFunction
            << "Attempt to detect interface for non-continuous phase: "
            << phase.name() << endl
            << exit(FatalError);
    }
    const phaseSystem::phaseModelPartialList& phases
    (
        resolvedInterface_.continuousPhases()
    );

    tmp<volScalarField> ri
    (
        new volScalarField
        (
            IOobject
            (
                "tmp",
                resolvedInterface_.mesh().time().name(),
                resolvedInterface_.mesh()
            ),
            resolvedInterface_.mesh(),
            dimensionedScalar(dimless, Zero)
        )
    );

    // Use maximum pair contribution
    forAll(phases, phasei)
    {
        const phaseModel& phase2 = phases[phasei];

        if (phase2 != phase)
        {
            ri.ref() = max(interfaceIndicator(phase, phase2), ri());
        }
    }

    // Allow for caching after evaluation
    ri.ref().rename(IOobject::groupName("interfaceIndicator", phase.name()));

    return ri;
}


bool Foam::interfaceIndicatorMethod::writeData(Ostream& os) const
{
    return os.good();
}


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