/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2011 OpenCFD Ltd.
     \\/     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/>.

Class
    Foam::fvMesh

Description
    Mesh data needed to do the Finite Volume discretisation.

    NOTE ON USAGE:
    fvMesh contains all the topological and geometric information
    related to the mesh.  It is also responsible for keeping the data
    up-to-date.  This is done by deleting the cell volume, face area,
    cell/face centre, addressing and other derived information as
    required and recalculating it as necessary.  The fvMesh therefore
    reserves the right to delete the derived information upon every
    topological (mesh refinement/morphing) or geometric change (mesh
    motion).  It is therefore unsafe to keep local references to the
    derived data outside of the time loop.

SourceFiles
    fvMesh.C
    fvMeshGeometry.C

\*---------------------------------------------------------------------------*/

#ifndef fvMesh_H
#define fvMesh_H

#include <OpenFOAM/polyMesh.H>
#include <OpenFOAM/lduMesh.H>
#include <OpenFOAM/primitiveMesh.H>
#include <finiteVolume/fvBoundaryMesh.H>
#include <finiteVolume/surfaceInterpolation.H>
#include <OpenFOAM/DimensionedField.H>
#include <finiteVolume/volFieldsFwd.H>
#include <finiteVolume/surfaceFieldsFwd.H>
#include <OpenFOAM/pointFieldsFwd.H>
#include <finiteVolume/slicedVolFieldsFwd.H>
#include <finiteVolume/slicedSurfaceFieldsFwd.H>
#include <OpenFOAM/className.H>

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

namespace Foam
{

class fvMeshLduAddressing;
class volMesh;


/*---------------------------------------------------------------------------*\
                           Class fvMesh Declaration
\*---------------------------------------------------------------------------*/

class fvMesh
:
    public polyMesh,
    public lduMesh,
    public surfaceInterpolation
{
    // Private data

        //- Boundary mesh
        fvBoundaryMesh boundary_;


    // Demand-driven data

        mutable fvMeshLduAddressing* lduPtr_;

        //- Current time index for cell volumes
        //  Note.  The whole mechanism will be replaced once the
        //  dimensionedField is created and the dimensionedField
        //  will take care of the old-time levels.
        mutable label curTimeIndex_;

        //- Cell volumes old time level
        mutable void* VPtr_;

        //- Cell volumes old time level
        mutable DimensionedField<scalar, volMesh>* V0Ptr_;

        //- Cell volumes old-old time level
        mutable DimensionedField<scalar, volMesh>* V00Ptr_;

        //- Face area vectors
        mutable slicedSurfaceVectorField* SfPtr_;

        //- Mag face area vectors
        mutable surfaceScalarField* magSfPtr_;

        //- Cell centres
        mutable slicedVolVectorField* CPtr_;

        //- Face centres
        mutable slicedSurfaceVectorField* CfPtr_;

        //- Face motion fluxes
        mutable surfaceScalarField* phiPtr_;


    // Private Member Functions

        // Storage management

            //- Clear geometry but not the old-time cell volumes
            void clearGeomNotOldVol();

            //- Clear geometry
            void clearGeom();

            //- Clear addressing
            void clearAddressing();


       // Make geometric data

            void makeSf() const;
            void makeMagSf() const;

            void makeC() const;
            void makeCf() const;


        //- Disallow construct as copy
        fvMesh(const fvMesh&);

        //- Disallow assignment
        void operator=(const fvMesh&);


public:

    // Public typedefs

        typedef fvMesh Mesh;
        typedef fvBoundaryMesh BoundaryMesh;


    // Declare name of the class and its debug switch
    ClassName("fvMesh");


    // Constructors

        //- Construct from IOobject
        explicit fvMesh(const IOobject& io);

        //- Construct from components without boundary.
        //  Boundary is added using addFvPatches() member function
        fvMesh
        (
            const IOobject& io,
            const Xfer<pointField>& points,
            const Xfer<faceList>& faces,
            const Xfer<labelList>& allOwner,
            const Xfer<labelList>& allNeighbour,
            const bool syncPar = true
        );

        //- Construct without boundary from cells rather than owner/neighbour.
        //  Boundary is added using addPatches() member function
        fvMesh
        (
            const IOobject& io,
            const Xfer<pointField>& points,
            const Xfer<faceList>& faces,
            const Xfer<cellList>& cells,
            const bool syncPar = true
        );


    // Destructor

        virtual ~fvMesh();


    // Member Functions

        // Helpers

            //- Add boundary patches. Constructor helper
            void addFvPatches
            (
                const List<polyPatch*>&,
                const bool validBoundary = true
            );

            //- Update the mesh based on the mesh files saved in time
            //  directories
            virtual readUpdateState readUpdate();


        // Access

            //- Return the top-level database
            const Time& time() const
            {
                return polyMesh::time();
            }

            //- Return the object registry - resolve conflict polyMesh/lduMesh
            virtual const objectRegistry& thisDb() const
            {
                return polyMesh::thisDb();
            }

            //- Return reference to name
            //  Note: name() is currently ambiguous due to derivation from
            //  surfaceInterpolation
            const word& name() const
            {
                return polyMesh::name();
            }

            //- Return reference to boundary mesh
            const fvBoundaryMesh& boundary() const;

            //- Return ldu addressing
            virtual const lduAddressing& lduAddr() const;

            //- Return a list of pointers for each patch
            //  with only those pointing to interfaces being set
            virtual lduInterfacePtrsList interfaces() const
            {
                return boundary().interfaces();
            }

            //- Internal face owner
            const unallocLabelList& owner() const
            {
                return lduAddr().lowerAddr();
            }

            //- Internal face neighbour
            const unallocLabelList& neighbour() const
            {
                return lduAddr().upperAddr();
            }

            //- Return cell volumes
            const DimensionedField<scalar, volMesh>& V() const;

            //- Return old-time cell volumes
            const DimensionedField<scalar, volMesh>& V0() const;

            //- Return old-old-time cell volumes
            const DimensionedField<scalar, volMesh>& V00() const;

            //- Return sub-cycle cell volumes
            tmp<DimensionedField<scalar, volMesh> > Vsc() const;

            //- Return sub-cycl old-time cell volumes
            tmp<DimensionedField<scalar, volMesh> > Vsc0() const;

            //- Return cell face area vectors
            const surfaceVectorField& Sf() const;

            //- Return cell face area magnitudes
            const surfaceScalarField& magSf() const;

            //- Return cell face motion fluxes
            const surfaceScalarField& phi() const;

            //- Return cell centres as volVectorField
            const volVectorField& C() const;

            //- Return face centres as surfaceVectorField
            const surfaceVectorField& Cf() const;


        // Edit

            //- Clear all geometry and addressing
            void clearOut();

            //- Update mesh corresponding to the given map
            virtual void updateMesh(const mapPolyMesh& mpm);

            //- Move points, returns volumes swept by faces in motion
            virtual tmp<scalarField> movePoints(const pointField&);

            //- Map all fields in time using given map.
            virtual void mapFields(const mapPolyMesh& mpm);

            //- Remove boundary patches. Warning: fvPatchFields hold ref to
            //  these fvPatches.
            void removeFvBoundary();

            //- Return cell face motion fluxes
            surfaceScalarField& setPhi();

            //- Return old-time cell volumes
            DimensionedField<scalar, volMesh>& setV0();


        // Write

            //- Write the underlying polyMesh and other data
            virtual bool writeObjects
            (
                IOstream::streamFormat fmt,
                IOstream::versionNumber ver,
                IOstream::compressionType cmp
            ) const;

            //- Write mesh using IO settings from time
            virtual bool write() const;


    // Member Operators

        bool operator!=(const fvMesh&) const;
        bool operator==(const fvMesh&) const;
};


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

} // End namespace Foam

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

#ifdef NoRepository
#   include <finiteVolume/fvPatchFvMeshTemplates.C>
#endif

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

#endif

// ************************ vim: set sw=4 sts=4 et: ************************ //
