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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2010 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef OSGEARTHSYMBOLOGY_GEOMETRY_H
#define OSGEARTHSYMBOLOGY_GEOMETRY_H 1

#include <osgEarthSymbology/Common>
#include <osgEarth/GeoData>
#include <osgEarth/Utils>
#include <vector>
#include <stack>

namespace osgEarth { namespace Symbology 
{
    using namespace osgEarth;

    class BufferParameters
    {
    public:
        enum CapStyle  { CAP_DEFAULT, CAP_SQUARE, CAP_ROUND, CAP_FLAT };
        enum JoinStyle { JOIN_ROUND, JOIN_MITRE, JOIN_BEVEL};
        BufferParameters( CapStyle capStyle =CAP_DEFAULT, JoinStyle joinStyle = JOIN_ROUND, int cornerSegs =0, bool singleSided=false, bool leftSide=false )
            : _capStyle(capStyle), _joinStyle(joinStyle),_cornerSegs(cornerSegs), _singleSided(singleSided), _leftSide(leftSide) { }
        CapStyle  _capStyle;
        JoinStyle _joinStyle;
        int       _cornerSegs; // # of line segment making up a rounded corner
        bool      _singleSided; //Whether or not to do a single sided buffer
        bool      _leftSide;    //If doing a single sided buffer are we buffering to the left?  If false, buffer to the right
    };

    typedef std::vector<osg::Vec3d> Vec3dVector;

    class OSGEARTHSYMBOLOGY_EXPORT Geometry : public osgEarth::MixinVector<osg::Vec3d,osg::Referenced>
    {
    public:
        Geometry( const Vec3dVector* toCopy );

    public:
        enum Type {
            TYPE_UNKNOWN,
            TYPE_POINTSET,
            TYPE_LINESTRING,
            TYPE_RING,
            TYPE_POLYGON,
            TYPE_MULTI
        };

        static std::string toString( Type t ) {
            return 
                t == TYPE_POINTSET ?   "pointset" :
                t == TYPE_LINESTRING ? "linestring" :
                t == TYPE_RING ?       "ring" :
                t == TYPE_POLYGON ?    "polygon" :
                t == TYPE_MULTI ?      "multi" :
                "unknown";
        }

        static Geometry* create( Type type, const Vec3dVector* toCopy );

        // true if osgEarth is compiled for buffering
        static bool hasBufferOperation();

    public:
        virtual int getTotalPointCount() const;

        virtual unsigned getNumComponents() const { return 1; }

        virtual unsigned getNumGeometries() const { return 1; }

        virtual Geometry* cloneAs( const Geometry::Type& newType ) const;

        osg::Vec3Array* toVec3Array() const;

        osg::Vec3dArray* toVec3dArray() const;

        virtual Bounds getBounds() const;

        bool isLinear() const { return getComponentType() == TYPE_LINESTRING || getComponentType() == TYPE_RING; }

        bool buffer(
            double distance,
            osg::ref_ptr<Geometry>& output,
            const BufferParameters& bp =BufferParameters() ) const;

        bool crop(
            const class Polygon* cropPolygon,
            osg::ref_ptr<Geometry>& output ) const;

        bool difference(
            const class Polygon* diffPolygon,
            osg::ref_ptr<Geometry>& output ) const;

        osg::Vec3d localize();

        void delocalize( const osg::Vec3d& offset );

    public:
        virtual Type getType() const =0;
        virtual Type getComponentType() const { return getType(); }
        virtual bool isValid() const { return size() >= 1; }

        virtual Geometry* clone() const { return cloneAs(getType()); }

    protected:
        Geometry( int capacity =0 );
        Geometry( const Geometry& rhs );

        Vec3dVector _data;
    };

    typedef std::vector< osg::ref_ptr<Geometry> > GeometryCollection;

    class OSGEARTHSYMBOLOGY_EXPORT PointSet : public Geometry
    {
    public:
        PointSet( int capacity =0 ) : Geometry( capacity ) { }
        PointSet( const Vec3dVector* toCopy ) : Geometry( toCopy ) { }
        PointSet( const PointSet& rhs );

    public:
        virtual Type getType() const { return Geometry::TYPE_POINTSET; }
    };

    class OSGEARTHSYMBOLOGY_EXPORT LineString : public Geometry
    {
    public:
        LineString( int capacity =0 ) : Geometry( capacity ) { }
        LineString( const LineString& rhs );
        LineString( const Vec3dVector* toCopy );

        double getLength() const;
        bool getSegment(double length, osg::Vec3d& start, osg::Vec3d& end);

    public:
        virtual Type getType() const { return Geometry::TYPE_LINESTRING; }
        virtual bool isValid() const { return size() >= 2; }
    };

    class OSGEARTHSYMBOLOGY_EXPORT Ring : public Geometry
    {
    public:
        enum Orientation {
            ORIENTATION_CCW,
            ORIENTATION_CW,
            ORIENTATION_DEGENERATE
        };

    public:
        Ring( int capacity =0 ) : Geometry( capacity ) { }
        Ring( const Ring& ring );
        Ring( const Vec3dVector* toCopy );

        // override
        virtual Geometry* cloneAs( const Geometry::Type& newType ) const;

        // gets the ring's orientation
        Orientation getOrientation() const;

        // tests whether the point falls withing the ring
        virtual bool contains2D( double x, double y ) const;

        // gets the signed area of a part that is known to be open.
        virtual double getSignedArea2D() const;

        // ensures that the first and last points are not idential.
        virtual void open();
        
        // opens and rewinds the ring to the specified orientation.
        void rewind( Orientation ori );

    public:
        virtual Type getType() const { return Geometry::TYPE_RING; }
        virtual bool isValid() const { return size() >= 3; }
    };

    typedef std::vector<osg::ref_ptr<Ring> > RingCollection;

    class OSGEARTHSYMBOLOGY_EXPORT Polygon : public Ring
    {
    public:
        Polygon( int capacity =0 ) : Ring( capacity ) { }
        Polygon( const Polygon& rhs );
        Polygon( const Vec3dVector* toCopy );
        
    public:
        virtual Type getType() const { return Geometry::TYPE_POLYGON; }
        virtual int getTotalPointCount() const;
        
        virtual unsigned getNumGeometries() const { return 1 + _holes.size(); }

        // tests whether the point falls withing the polygon (but not its holes)
        virtual bool contains2D( double x, double y ) const;

        virtual void open();

    public:
        RingCollection& getHoles() { return _holes; }
        const RingCollection& getHoles() const { return _holes; }

    protected:
        RingCollection _holes;
    };

    class OSGEARTHSYMBOLOGY_EXPORT MultiGeometry : public Geometry
    {
    public:
        MultiGeometry() { }
        MultiGeometry( const GeometryCollection& parts );
        MultiGeometry( const MultiGeometry& rhs );

    public:
        virtual Type getType() const { return Geometry::TYPE_MULTI; }        
        virtual Type getComponentType() const;
        virtual int getTotalPointCount() const;        
        virtual unsigned getNumComponents() const { return _parts.size(); }
        
        virtual unsigned getNumGeometries() const;

        // override
        virtual Geometry* cloneAs( const Geometry::Type& newType ) const;
        virtual bool isValid() const;
        virtual Bounds getBounds() const;

    public:
        GeometryCollection& getComponents() { return _parts; }
        const GeometryCollection& getComponents() const { return _parts; }

    protected:
        GeometryCollection _parts;
    };

    class OSGEARTHSYMBOLOGY_EXPORT GeometryIterator
    {
    public:
        GeometryIterator(
            Geometry* geom,
            bool      traversePolygonHoles  =true );

        bool hasMore() const;
        Geometry* next();

    private:
        Geometry* _next;
        std::stack<Geometry*> _stack;
        bool _traverseMulti;
        bool _traversePolyHoles;

        void fetchNext();
    };

    class OSGEARTHSYMBOLOGY_EXPORT ConstGeometryIterator
    {
    public:
        ConstGeometryIterator(
            const Geometry* geom,
            bool            traversePolygonHoles  =true );

        bool hasMore() const;
        const Geometry* next();

    private:
        const Geometry* _next;
        std::stack<const Geometry*> _stack;
        bool _traverseMulti;
        bool _traversePolyHoles;

        void fetchNext();
    };

    typedef std::pair<osg::Vec3d, osg::Vec3d> Segment;

    class OSGEARTHSYMBOLOGY_EXPORT ConstSegmentIterator
    {
    public:
        ConstSegmentIterator( const Geometry* verts, bool closedLoop );        
        bool hasMore() const { return !_done; }
        Segment next();

    private:
        const Vec3dVector* _verts;
        Vec3dVector::const_iterator _iter;
        bool _done;
        bool _closeLoop;
    };

    typedef std::vector<osg::ref_ptr<Geometry> > GeometryList;

} } // namespace osgEarth::Symbology


#endif // OSGEARTHSYMBOLOGY_GEOMETRY_H