/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2016 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 "hexMatcher.H"
#include "primitiveMesh.H"
#include "ListOps.H"

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

const Foam::label Foam::hexMatcher::vertPerCell = 8;
const Foam::label Foam::hexMatcher::facePerCell = 6;
const Foam::label Foam::hexMatcher::maxVertPerFace = 4;


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

Foam::hexMatcher::hexMatcher()
:
    cellMatcher
    (
        vertPerCell,
        facePerCell,
        maxVertPerFace,
        "hex"
    )
{}


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

Foam::hexMatcher::~hexMatcher()
{}


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

bool Foam::hexMatcher::matchShape
(
    const bool checkOnly,
    const faceList& faces,
    const labelList& owner,
    const label celli,
    const labelList& myFaces
)
{
    if (!faceSizeMatch(faces, myFaces))
    {
        return false;
    }

    // Is hex for sure since all faces are quads

    if (checkOnly)
    {
        return true;
    }

    // Calculate localFaces_ and mapping pointMap_, faceMap_
    label numVert = calcLocalFaces(faces, myFaces);

    if (numVert != vertPerCell)
    {
        return false;
    }

    // Set up 'edge' to face mapping.
    calcEdgeAddressing(numVert);

    // Set up point on face to index-in-face mapping
    calcPointFaceIndex();

    // Storage for maps -vertex to mesh and -face to mesh
    vertLabels_.setSize(vertPerCell);
    faceLabels_.setSize(facePerCell);

    //
    // Try bottom face (face 4).
    // Only need to try one orientation of this face since hex is
    // rotation symmetric
    //

    label face4I = 0;

    const face& face4 = localFaces_[face4I];
    label face4vert0 = 0;

    vertLabels_[0] = pointMap_[face4[face4vert0]];
    faceLabels_[4] = faceMap_[face4I];

    // Walk face 4 from vertex 0 to 1
    label face4vert1 =
        nextVert
        (
            face4vert0,
            faceSize_[face4I],
            !(owner[faceMap_[face4I]] == celli)
        );
    vertLabels_[1] = pointMap_[face4[face4vert1]];

    // Walk face 4 from vertex 1 to 2
    label face4vert2 =
        nextVert
        (
            face4vert1,
            faceSize_[face4I],
            !(owner[faceMap_[face4I]] == celli)
        );
    vertLabels_[2] = pointMap_[face4[face4vert2]];

    // Walk face 4 from vertex 2 to 3
    label face4vert3 =
        nextVert
        (
            face4vert2,
            faceSize_[face4I],
            !(owner[faceMap_[face4I]] == celli)
        );
    vertLabels_[3] = pointMap_[face4[face4vert3]];

    // Jump edge from face4 to face0
    label face0I =
        otherFace
        (
            numVert,
            face4[face4vert3],
            face4[face4vert0],
            face4I
        );
    faceLabels_[0] = faceMap_[face0I];
    const face& face0 = localFaces_[face0I];

    label face0vert0 = pointFaceIndex_[face4[face4vert0]][face0I];

    // Walk face 0 from vertex 0 to 4
    label face0vert4 =
        nextVert
        (
            face0vert0,
            faceSize_[face0I],
            (owner[faceMap_[face0I]] == celli)
        );
    vertLabels_[4] = pointMap_[face0[face0vert4]];

    // Walk face 0 from vertex 4 to 7
    label face0vert7 =
        nextVert
        (
            face0vert4,
            faceSize_[face0I],
            (owner[faceMap_[face0I]] == celli)
        );
    vertLabels_[7] = pointMap_[face0[face0vert7]];

    // Jump edge from face0 to face5
    label face5I =
        otherFace
        (
            numVert,
            face0[face0vert4],
            face0[face0vert7],
            face0I
        );
    const face& face5 = localFaces_[face5I];
    faceLabels_[5] = faceMap_[face5I];

    label face5vert4 = pointFaceIndex_[face0[face0vert4]][face5I];

    // Walk face 5 from vertex 4 to 5
    label face5vert5 =
        nextVert
        (
            face5vert4,
            faceSize_[face5I],
            (owner[faceMap_[face5I]] == celli)
        );
    vertLabels_[5] = pointMap_[face5[face5vert5]];

    // Walk face 5 from vertex 5 to 6
    label face5vert6 =
        nextVert
        (
            face5vert5,
            faceSize_[face5I],
            (owner[faceMap_[face5I]] == celli)
        );
    vertLabels_[6] = pointMap_[face5[face5vert6]];

    // Jump edge from face4 to face2
    label face2I =
        otherFace
        (
            numVert,
            face4[face4vert0],
            face4[face4vert1],
            face4I
        );
    faceLabels_[2] = faceMap_[face2I];

    // Jump edge from face4 to face1
    label face1I =
        otherFace
        (
            numVert,
            face4[face4vert1],
            face4[face4vert2],
            face4I
        );
    faceLabels_[1] = faceMap_[face1I];

    // Jump edge from face4 to face3
    label face3I =
        otherFace
        (
            numVert,
            face4[face4vert2],
            face4[face4vert3],
            face4I
        );
    faceLabels_[3] = faceMap_[face3I];

    return true;
}


Foam::label Foam::hexMatcher::faceHashValue() const
{
    return facePerCell*vertPerCell;
}


bool Foam::hexMatcher::faceSizeMatch
(
    const faceList& faces,
    const labelList& myFaces
) const
{
    if (myFaces.size() != facePerCell)
    {
        return false;
    }

    forAll(myFaces, myFacei)
    {
        label size = faces[myFaces[myFacei]].size();

        if (size != 4)
        {
            return false;
        }
    }

    return true;
}


bool Foam::hexMatcher::isA(const primitiveMesh& mesh, const label celli)
{
    return matchShape
    (
        true,
        mesh.faces(),
        mesh.faceOwner(),
        celli,
        mesh.cells()[celli]
    );
}


bool Foam::hexMatcher::isA(const faceList& faces)
{
    // Do as if mesh with one cell only
    return matchShape
    (
        true,
        faces,                      // all faces in mesh
        labelList(faces.size(), 0), // cell 0 is owner of all faces
        0,                          // cell label
        identity(faces.size())      // faces of cell 0
    );
}


bool Foam::hexMatcher::matches
(
    const primitiveMesh& mesh,
    const label celli,
    cellShape& shape
)
{
    if
    (
        matchShape
        (
            false,
            mesh.faces(),
            mesh.faceOwner(),
            celli,
            mesh.cells()[celli]
        )
    )
    {
        shape = cellShape(model(), vertLabels());

        return true;
    }
    else
    {
        return false;
    }
}


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