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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2026 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 "fvMeshDistribute.H"
#include "polyTopoChangeMap.H"
#include "processorFvPatchField.H"

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

template<class GeoField>
void Foam::fvMeshDistribute::printFieldInfo(const fvMesh& mesh)
{
    const UPtrList<GeoField> fields
    (
        mesh.fields<GeoField>(false, fvMesh::curGeometryFields)
    );

    forAll(fields, i)
    {
        const GeoField& field = fields[i];

        Pout<< "Field:" << field.name() << " internal size:" << field.size()
            << endl;

        forAll(field.boundaryField(), patchi)
        {
            Pout<< "    " << patchi
                << ' ' << field.boundaryField()[patchi].patch().name()
                << ' ' << field.boundaryField()[patchi].type()
                << ' ' << field.boundaryField()[patchi].size()
                << endl;
        }
    }
}


template<class GeoField>
void Foam::fvMeshDistribute::saveBoundaryFields
(
    PtrList<typename GeoField::BoundaryField>& bfields
) const
{
    // Save whole boundary field

    const UPtrList<GeoField> fields
    (
        mesh_.fields<GeoField>(false, fvMesh::curGeometryFields)
    );

    bfields.setSize(fields.size());

    forAll(fields, i)
    {
        const GeoField& field = fields[i];

        bfields.set
        (
            i,
            new typename GeoField::BoundaryField
            (
                field.boundaryField(),
                field
            )
        );
    }
}


template<class GeoField>
void Foam::fvMeshDistribute::mapBoundaryFields
(
    const polyTopoChangeMap& map,
    const PtrList<typename GeoField::BoundaryField>& oldBfields
)
{
    // Map boundary field

    const labelList& oldPatchStarts = map.oldPatchStarts();
    const labelList& faceMap = map.faceMap();

    UPtrList<GeoField> fields
    (
        mesh_.fields<GeoField>(false, fvMesh::curGeometryFields)
    );

    forAll(fields, i)
    {
        GeoField& field = fields[i];

        typename GeoField::BoundaryField& bfield = field.boundaryFieldRef();
        const typename GeoField::BoundaryField& oldBfield = oldBfields[i];

        // Pull from old boundary field into bfield.

        forAll(bfield, patchi)
        {
            typename GeoField::PatchField& patchField = bfield[patchi];
            label facei = patchField.patch().start();

            forAll(patchField, i)
            {
                label oldFacei = faceMap[facei++];

                // Find patch and local patch face oldFacei was in.
                forAll(oldPatchStarts, oldPatchi)
                {
                    label oldLocalI = oldFacei - oldPatchStarts[oldPatchi];

                    if
                    (
                        oldLocalI >= 0
                     && oldLocalI < oldBfield[oldPatchi].size()
                    )
                    {
                        patchField[i] = oldBfield[oldPatchi][oldLocalI];
                    }
                }
            }
        }
    }
}


template<class Type>
void Foam::fvMeshDistribute::initMapExposedFaces
(
    PtrList<Field<Type>>& ifields
) const
{
    const UPtrList<SurfaceField<Type>> fields
    (
        mesh_.fields<SurfaceField<Type>>(false, fvMesh::curGeometryFields)
    );

    ifields.setSize(fields.size());

    forAll(fields, i)
    {
        ifields.set(i, Field<Type>(mesh_.nFaces()));

        const SurfaceField<Type>& field = fields[i];

        SubList<Type>(ifields[i], field.primitiveField().size()) =
            field.primitiveField();

        forAll(field.boundaryField(), patchi)
        {
            const fvsPatchField<Type>& pfield = field.boundaryField()[patchi];

            SubList<Type>(ifields[i], pfield.size(), pfield.patch().start()) =
                pfield;
        }
    }
}


template<class Type>
void Foam::fvMeshDistribute::mapExposedFaces
(
    const polyTopoChangeMap& map,
    const PtrList<Field<Type>>& oldFields
)
{
    UPtrList<SurfaceField<Type>> fields
    (
        mesh_.fields<SurfaceField<Type>>(false, fvMesh::curGeometryFields)
    );

    forAll(fields, i)
    {
        SurfaceField<Type>& field = fields[i];

        const Field<Type>& oldField = oldFields[i];

        const bool negateIfFlipped = isFlux(field);

        forAll(field.boundaryField(), patchi)
        {
            fvsPatchField<Type>& patchField = field.boundaryFieldRef()[patchi];

            forAll(patchField, i)
            {
                const label facei = patchField.patch().start()+i;
                const label oldFacei = map.faceMap()[facei];

                if (oldFacei < map.nOldInternalFaces())
                {
                    if (negateIfFlipped && map.flipFaceFlux().found(facei))
                    {
                        patchField[i] = flipOp()(oldField[oldFacei]);
                    }
                    else
                    {
                        patchField[i] = oldField[oldFacei];
                    }
                }
                else
                {
                    patchField[i] = oldField[oldFacei];
                }
            }
        }
    }
}


template<class GeoField>
void Foam::fvMeshDistribute::correctProcessorPatchFields()
{
    UPtrList<GeoField> fields
    (
        mesh_.fields<GeoField>(false, fvMesh::curGeometryFields)
    );

    // Ensure the deltaCoeffs are available for constraint patch evaluation
    mesh_.deltaCoeffs();

    forAll(fields, i)
    {
        GeoField& field = fields[i];

        typename GeoField::BoundaryField& bfield = field.boundaryFieldRef();

        if
        (
            Pstream::defaultCommsType == Pstream::commsTypes::blocking
         || Pstream::defaultCommsType == Pstream::commsTypes::nonBlocking
        )
        {
            label nReq = Pstream::nRequests();

            forAll(bfield, patchi)
            {
                if (isA<processorPolyPatch>(bfield[patchi].patch().poly()))
                {
                    bfield[patchi].initEvaluate(Pstream::defaultCommsType);
                }
            }

            // Block for any outstanding requests
            if
            (
                Pstream::parRun()
             && Pstream::defaultCommsType == Pstream::commsTypes::nonBlocking
            )
            {
                Pstream::waitRequests(nReq);
            }

            forAll(bfield, patchi)
            {
                if (isA<processorPolyPatch>(bfield[patchi].patch().poly()))
                {
                    bfield[patchi].evaluate(Pstream::defaultCommsType);
                }
            }
        }
        else if (Pstream::defaultCommsType == Pstream::commsTypes::scheduled)
        {
            const lduSchedule& patchSchedule =
                mesh_.globalData().patchSchedule();

            forAll(patchSchedule, patchEvali)
            {
                if
                (
                    isA<processorPolyPatch>
                    (
                        bfield[patchSchedule[patchEvali].patch].patch().poly()
                    )
                )
                {
                    if (patchSchedule[patchEvali].init)
                    {
                        bfield[patchSchedule[patchEvali].patch]
                            .initEvaluate(Pstream::commsTypes::scheduled);
                    }
                    else
                    {
                        bfield[patchSchedule[patchEvali].patch]
                            .evaluate(Pstream::commsTypes::scheduled);
                    }
                }
            }
        }
    }
}


template<class GeoField>
void Foam::fvMeshDistribute::sendFields
(
    const label domain,
    const wordList& fieldNames,
    const fvMeshSubset& subsetter,
    Ostream& toNbr
)
{
    // Send fields. Note order supplied so we can receive in exactly the same
    // order.
    // Note that field gets written as entry in dictionary so we
    // can construct from subdictionary.
    // (since otherwise the reading as-a-dictionary mixes up entries from
    // consecutive fields)
    // The dictionary constructed is:
    //  volScalarField
    //  {
    //      p {internalField ..; boundaryField ..;}
    //      k {internalField ..; boundaryField ..;}
    //  }
    //  volVectorField
    //  {
    //      U {internalField ...  }
    //  }

    // volVectorField {U {internalField ..; boundaryField ..;}}

    toNbr << GeoField::typeName << token::NL << token::BEGIN_BLOCK << token::NL;
    forAll(fieldNames, i)
    {
        if (debug)
        {
            Pout<< "Subsetting field " << fieldNames[i]
                << " for domain:" << domain << endl;
        }

        // Send all fieldNames. This has to be exactly the same set as is
        // being received!
        const GeoField& field =
            subsetter.baseMesh().lookupObject<GeoField>(fieldNames[i]);

        tmp<GeoField> tsubfield = subsetter.interpolate(field);

        toNbr
            << fieldNames[i] << token::NL << token::BEGIN_BLOCK
            << tsubfield
            << token::NL << token::END_BLOCK << token::NL;
    }
    toNbr << token::END_BLOCK << token::NL;
}


template<class GeoField>
void Foam::fvMeshDistribute::receiveFields
(
    const label domain,
    const wordList& fieldNames,
    typename GeoField::Mesh& mesh,
    PtrList<GeoField>& fields,
    const dictionary& fieldDicts
)
{
    if (debug)
    {
        Pout<< "Receiving fields " << fieldNames
            << " from domain:" << domain << endl;
    }

    fields.setSize(fieldNames.size());

    forAll(fieldNames, i)
    {
        if (debug)
        {
            Pout<< "Constructing field " << fieldNames[i]
                << " from domain:" << domain << endl;
        }

        fields.set
        (
            i,
            new GeoField
            (
                IOobject
                (
                    fieldNames[i],
                    mesh.db().time().name(),
                    mesh.db(),
                    IOobject::NO_READ,
                    IOobject::AUTO_WRITE
                ),
                mesh,
                fieldDicts.subDict(fieldNames[i])
            )
        );
    }
}


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

	/---------------------------------------------------------------------------\
	========= \|
	\\ / F ield \| OpenFOAM: The Open Source CFD Toolbox
	\\ / O peration \| Website: https://openfoam.org
	\\ / A nd \| Copyright (C) 2011-2026 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 "fvMeshDistribute.H"
	#include "polyTopoChangeMap.H"
	#include "processorFvPatchField.H"

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

	template<class GeoField>
	void Foam::fvMeshDistribute::printFieldInfo(const fvMesh& mesh)
	{
	const UPtrList<GeoField> fields
	(
	mesh.fields<GeoField>(false, fvMesh::curGeometryFields)
	);

	forAll(fields, i)
	{
	const GeoField& field = fields[i];

	Pout<< "Field:" << field.name() << " internal size:" << field.size()
	<< endl;

	forAll(field.boundaryField(), patchi)
	{
	Pout<< " " << patchi
	<< ' ' << field.boundaryField()[patchi].patch().name()
	<< ' ' << field.boundaryField()[patchi].type()
	<< ' ' << field.boundaryField()[patchi].size()
	<< endl;
	}
	}
	}


	template<class GeoField>
	void Foam::fvMeshDistribute::saveBoundaryFields
	(
	PtrList<typename GeoField::BoundaryField>& bfields
	) const
	{
	// Save whole boundary field

	const UPtrList<GeoField> fields
	(
	mesh_.fields<GeoField>(false, fvMesh::curGeometryFields)
	);

	bfields.setSize(fields.size());

	forAll(fields, i)
	{
	const GeoField& field = fields[i];

	bfields.set
	(
	i,
	new typename GeoField::BoundaryField
	(
	field.boundaryField(),
	field
	)
	);
	}
	}


	template<class GeoField>
	void Foam::fvMeshDistribute::mapBoundaryFields
	(
	const polyTopoChangeMap& map,
	const PtrList<typename GeoField::BoundaryField>& oldBfields
	)
	{
	// Map boundary field

	const labelList& oldPatchStarts = map.oldPatchStarts();
	const labelList& faceMap = map.faceMap();

	UPtrList<GeoField> fields
	(
	mesh_.fields<GeoField>(false, fvMesh::curGeometryFields)
	);

	forAll(fields, i)
	{
	GeoField& field = fields[i];

	typename GeoField::BoundaryField& bfield = field.boundaryFieldRef();
	const typename GeoField::BoundaryField& oldBfield = oldBfields[i];

	// Pull from old boundary field into bfield.

	forAll(bfield, patchi)
	{
	typename GeoField::PatchField& patchField = bfield[patchi];
	label facei = patchField.patch().start();

	forAll(patchField, i)
	{
	label oldFacei = faceMap[facei++];

	// Find patch and local patch face oldFacei was in.
	forAll(oldPatchStarts, oldPatchi)
	{
	label oldLocalI = oldFacei - oldPatchStarts[oldPatchi];

	if
	(
	oldLocalI >= 0
	&& oldLocalI < oldBfield[oldPatchi].size()
	)
	{
	patchField[i] = oldBfield[oldPatchi][oldLocalI];
	}
	}
	}
	}
	}
	}


	template<class Type>
	void Foam::fvMeshDistribute::initMapExposedFaces
	(
	PtrList<Field<Type>>& ifields
	) const
	{
	const UPtrList<SurfaceField<Type>> fields
	(
	mesh_.fields<SurfaceField<Type>>(false, fvMesh::curGeometryFields)
	);

	ifields.setSize(fields.size());

	forAll(fields, i)
	{
	ifields.set(i, Field<Type>(mesh_.nFaces()));

	const SurfaceField<Type>& field = fields[i];

	SubList<Type>(ifields[i], field.primitiveField().size()) =
	field.primitiveField();

	forAll(field.boundaryField(), patchi)
	{
	const fvsPatchField<Type>& pfield = field.boundaryField()[patchi];

	SubList<Type>(ifields[i], pfield.size(), pfield.patch().start()) =
	pfield;
	}
	}
	}


	template<class Type>
	void Foam::fvMeshDistribute::mapExposedFaces
	(
	const polyTopoChangeMap& map,
	const PtrList<Field<Type>>& oldFields
	)
	{
	UPtrList<SurfaceField<Type>> fields
	(
	mesh_.fields<SurfaceField<Type>>(false, fvMesh::curGeometryFields)
	);

	forAll(fields, i)
	{
	SurfaceField<Type>& field = fields[i];

	const Field<Type>& oldField = oldFields[i];

	const bool negateIfFlipped = isFlux(field);

	forAll(field.boundaryField(), patchi)
	{
	fvsPatchField<Type>& patchField = field.boundaryFieldRef()[patchi];

	forAll(patchField, i)
	{
	const label facei = patchField.patch().start()+i;
	const label oldFacei = map.faceMap()[facei];

	if (oldFacei < map.nOldInternalFaces())
	{
	if (negateIfFlipped && map.flipFaceFlux().found(facei))
	{
	patchField[i] = flipOp()(oldField[oldFacei]);
	}
	else
	{
	patchField[i] = oldField[oldFacei];
	}
	}
	else
	{
	patchField[i] = oldField[oldFacei];
	}
	}
	}
	}
	}


	template<class GeoField>
	void Foam::fvMeshDistribute::correctProcessorPatchFields()
	{
	UPtrList<GeoField> fields
	(
	mesh_.fields<GeoField>(false, fvMesh::curGeometryFields)
	);

	// Ensure the deltaCoeffs are available for constraint patch evaluation
	mesh_.deltaCoeffs();

	forAll(fields, i)
	{
	GeoField& field = fields[i];

	typename GeoField::BoundaryField& bfield = field.boundaryFieldRef();

	if
	(
	Pstream::defaultCommsType == Pstream::commsTypes::blocking
	\|\| Pstream::defaultCommsType == Pstream::commsTypes::nonBlocking
	)
	{
	label nReq = Pstream::nRequests();

	forAll(bfield, patchi)
	{
	if (isA<processorPolyPatch>(bfield[patchi].patch().poly()))
	{
	bfield[patchi].initEvaluate(Pstream::defaultCommsType);
	}
	}

	// Block for any outstanding requests
	if
	(
	Pstream::parRun()
	&& Pstream::defaultCommsType == Pstream::commsTypes::nonBlocking
	)
	{
	Pstream::waitRequests(nReq);
	}

	forAll(bfield, patchi)
	{
	if (isA<processorPolyPatch>(bfield[patchi].patch().poly()))
	{
	bfield[patchi].evaluate(Pstream::defaultCommsType);
	}
	}
	}
	else if (Pstream::defaultCommsType == Pstream::commsTypes::scheduled)
	{
	const lduSchedule& patchSchedule =
	mesh_.globalData().patchSchedule();

	forAll(patchSchedule, patchEvali)
	{
	if
	(
	isA<processorPolyPatch>
	(
	bfield[patchSchedule[patchEvali].patch].patch().poly()
	)
	)
	{
	if (patchSchedule[patchEvali].init)
	{
	bfield[patchSchedule[patchEvali].patch]
	.initEvaluate(Pstream::commsTypes::scheduled);
	}
	else
	{
	bfield[patchSchedule[patchEvali].patch]
	.evaluate(Pstream::commsTypes::scheduled);
	}
	}
	}
	}
	}
	}


	template<class GeoField>
	void Foam::fvMeshDistribute::sendFields
	(
	const label domain,
	const wordList& fieldNames,
	const fvMeshSubset& subsetter,
	Ostream& toNbr
	)
	{
	// Send fields. Note order supplied so we can receive in exactly the same
	// order.
	// Note that field gets written as entry in dictionary so we
	// can construct from subdictionary.
	// (since otherwise the reading as-a-dictionary mixes up entries from
	// consecutive fields)
	// The dictionary constructed is:
	// volScalarField
	// {
	// p {internalField ..; boundaryField ..;}
	// k {internalField ..; boundaryField ..;}
	// }
	// volVectorField
	// {
	// U {internalField ... }
	// }

	// volVectorField {U {internalField ..; boundaryField ..;}}

	toNbr << GeoField::typeName << token::NL << token::BEGIN_BLOCK << token::NL;
	forAll(fieldNames, i)
	{
	if (debug)
	{
	Pout<< "Subsetting field " << fieldNames[i]
	<< " for domain:" << domain << endl;
	}

	// Send all fieldNames. This has to be exactly the same set as is
	// being received!
	const GeoField& field =
	subsetter.baseMesh().lookupObject<GeoField>(fieldNames[i]);

	tmp<GeoField> tsubfield = subsetter.interpolate(field);

	toNbr
	<< fieldNames[i] << token::NL << token::BEGIN_BLOCK
	<< tsubfield
	<< token::NL << token::END_BLOCK << token::NL;
	}
	toNbr << token::END_BLOCK << token::NL;
	}


	template<class GeoField>
	void Foam::fvMeshDistribute::receiveFields
	(
	const label domain,
	const wordList& fieldNames,
	typename GeoField::Mesh& mesh,
	PtrList<GeoField>& fields,
	const dictionary& fieldDicts
	)
	{
	if (debug)
	{
	Pout<< "Receiving fields " << fieldNames
	<< " from domain:" << domain << endl;
	}

	fields.setSize(fieldNames.size());

	forAll(fieldNames, i)
	{
	if (debug)
	{
	Pout<< "Constructing field " << fieldNames[i]
	<< " from domain:" << domain << endl;
	}

	fields.set
	(
	i,
	new GeoField
	(
	IOobject
	(
	fieldNames[i],
	mesh.db().time().name(),
	mesh.db(),
	IOobject::NO_READ,
	IOobject::AUTO_WRITE
	),
	mesh,
	fieldDicts.subDict(fieldNames[i])
	)
	);
	}
	}


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