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

Class
    Foam::triSurfaceMesh

Description
    IOoject and searching on triSurface

    Note: when constructing from dictionary has optional parameters:
        - scale     : scaling factor.
        - tolerance : relative tolerance for doing intersections
                      (see triangle::intersection)
        - minQuality: discard triangles with low quality when getting normal

SourceFiles
    triSurfaceMesh.C

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

#ifndef triSurfaceMesh_H
#define triSurfaceMesh_H

#include "treeBoundBox.H"
#include "searchableSurface.H"
#include "objectRegistry.H"
#include "indexedOctree.H"
#include "treeDataTriSurface.H"
#include "treeDataEdge.H"
#include "EdgeMap.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class triSurfaceMesh Declaration
\*---------------------------------------------------------------------------*/

class triSurfaceMesh
:
    public searchableSurface,
    public objectRegistry,      // so we can store fields
    public triSurface
{
private:

    // Private member data

        //- Optional tolerance to use in searches
        scalar tolerance_;

        //- Optional min triangle quality. Triangles below this get
        //  ignored for normal calculation
        scalar minQuality_;

        //- Optional max tree depth of octree
        label maxTreeDepth_;

        //- Search tree (triangles)
        mutable autoPtr<indexedOctree<treeDataTriSurface> > tree_;

        //- Search tree for boundary edges.
        mutable autoPtr<indexedOctree<treeDataEdge> > edgeTree_;

        //- Names of regions
        mutable wordList regions_;

        //- Is surface closed
        mutable label surfaceClosed_;

    // Private Member Functions

        ////- Helper: find instance of files without header
        //static word findRawInstance
        //(
        //    const Time&,
        //    const fileName&,
        //    const word&
        //);

        //- Check file existence
        static const fileName& checkFile
        (
            const fileName& fName,
            const fileName& objectName
        );

        //- Helper function for isSurfaceClosed
        static bool addFaceToEdge
        (
            const edge&,
            EdgeMap<label>&
        );

        //- Check whether surface is closed without calculating any permanent
        //  addressing.
        bool isSurfaceClosed() const;

        //- Steps to next intersection. Adds smallVec and starts tracking
        //  from there.
        static void getNextIntersections
        (
            const indexedOctree<treeDataTriSurface>& octree,
            const point& start,
            const point& end,
            const vector& smallVec,
            DynamicList<pointIndexHit, 1, 1>& hits
        );

        //- Disallow default bitwise copy construct
        triSurfaceMesh(const triSurfaceMesh&);

        //- Disallow default bitwise assignment
        void operator=(const triSurfaceMesh&);


protected:

        //- Calculate (number of)used points and their bounding box
        void calcBounds(boundBox& bb, label& nPoints) const;

public:

    //- Runtime type information
    TypeName("triSurfaceMesh");


    // Constructors

        //- Construct from triSurface
        triSurfaceMesh(const IOobject&, const triSurface&);

        //- Construct read.
        triSurfaceMesh(const IOobject& io);

        //- Construct from IO and dictionary (used by searchableSurface).
        //  Dictionary may contain a 'scale' entry (eg, 0.001: mm -> m)
        triSurfaceMesh
        (
            const IOobject& io,
            const dictionary& dict
        );


    //- Destructor
    virtual ~triSurfaceMesh();

        //- Clear storage
        void clearOut();


    // Member Functions

        //- Move points
        virtual void movePoints(const pointField&);

        //- Demand driven contruction of octree
        const indexedOctree<treeDataTriSurface>& tree() const;

        //- Demand driven contruction of octree for boundary edges
        const indexedOctree<treeDataEdge>& edgeTree() const;


        // searchableSurface implementation

            virtual const wordList& regions() const;

            //- Whether supports volume type below. I.e. whether is closed.
            virtual bool hasVolumeType() const;

            //- Range of local indices that can be returned.
            virtual label size() const
            {
                return triSurface::size();
            }

            //- Get representative set of element coordinates
            //  Usually the element centres (should be of length size()).
            virtual pointField coordinates() const;

            // Does any part of the surface overlap the supplied bound box?
            virtual bool overlaps(const boundBox& bb) const;

            virtual void findNearest
            (
                const pointField& sample,
                const scalarField& nearestDistSqr,
                List<pointIndexHit>&
            ) const;

            virtual void findLine
            (
                const pointField& start,
                const pointField& end,
                List<pointIndexHit>&
            ) const;

            virtual void findLineAny
            (
                const pointField& start,
                const pointField& end,
                List<pointIndexHit>&
            ) const;

            //- Get all intersections in order from start to end.
            virtual void findLineAll
            (
                const pointField& start,
                const pointField& end,
                List<List<pointIndexHit> >&
            ) const;

            //- From a set of points and indices get the region
            virtual void getRegion
            (
                const List<pointIndexHit>&,
                labelList& region
            ) const;

            //- From a set of points and indices get the normal
            virtual void getNormal
            (
                const List<pointIndexHit>&,
                vectorField& normal
            ) const;

            //- Determine type (inside/outside/mixed) for point. unknown if
            //  cannot be determined (e.g. non-manifold surface)
            virtual void getVolumeType
            (
                const pointField&,
                List<volumeType>&
            ) const;

        // Other

            //- Set bounds of surface. Bounds currently set as list of
            //  bounding boxes. The bounds are hints to the surface as for
            //  the range of queries it can expect. faceMap/pointMap can be
            //  set if the surface has done any redistribution.
            virtual void distribute
            (
                const List<treeBoundBox>&,
                const bool keepNonLocal,
                autoPtr<mapDistribute>& faceMap,
                autoPtr<mapDistribute>& pointMap
            )
            {}

            //- WIP. Store element-wise field.
            virtual void setField(const labelList& values);

            //- WIP. From a set of hits (points and
            //  indices) get the specified field. Misses do not get set.
            virtual void getField(const List<pointIndexHit>&, labelList&) const;


        // regIOobject implementation

            bool writeData(Ostream&) const
            {
                notImplemented("triSurfaceMesh::writeData(Ostream&) const");
                return false;
            }

            //- Write using given format, version and compression
            virtual bool writeObject
            (
                IOstream::streamFormat fmt,
                IOstream::versionNumber ver,
                IOstream::compressionType cmp
            ) const;

};


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

} // End namespace Foam

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

#endif

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