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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2011 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 OSGEARTH_OVERLAY_NODE_H
#define OSGEARTH_OVERLAY_NODE_H 1

#include <osgEarth/Common>
#include <osgEarth/MapNodeObserver>
#include <osg/Group>

namespace osgEarth
{
    class MapNode;

    /**
     * Abstract base class for a node that injects geometry into the MapNode's
     * OverlayDecorator.
     */
    class OSGEARTH_EXPORT OverlayNode : public osg::Group, 
                                        public MapNodeObserver
    {
    public:
        // signature for the function that provides the technique group.
        typedef osg::Group* (*TechniqueProvider)(MapNode*);      
        
    public:
        /**
         * Constructs a new overlay node.
         */
        OverlayNode( MapNode* mapNode, bool active, TechniqueProvider f =0L );

    public:
        /**
         * Whether overlay is active. If true, the subgraph renders as a
         * terrain overlay; If false it renders normally.
         */
        void setActive( bool value );
        bool getActive() const { return _active; }

    public: // MapNodeObserver

        void setMapNode( MapNode* mapNode );

        MapNode* getMapNode() { return _mapNode.get(); }

        /** Sets the method that returns the technique group or overlay nodes */
        void setTechniqueProvider(TechniqueProvider provider);

    public: // osg::Node

        virtual void traverse( osg::NodeVisitor& nv );

    public: // osg::Group

        // override these in order to manage the proxy container.
        virtual bool addChild( osg::Node* child );
        virtual bool insertChild( unsigned index, osg::Node* child );
        virtual bool removeChild( osg::Node* child );
        virtual bool replaceChild( osg::Node* origChild, osg::Node* newChild );

    protected:
        /** dtor */
        virtual ~OverlayNode() { }

    private:
        bool                          _active;
        bool                          _dirty;
        bool                          _newActive;
        osg::ref_ptr<osg::Group>      _overlayProxyContainer;
        osg::observer_ptr<MapNode>    _mapNode;
        TechniqueProvider             _getGroup;

        void applyChanges();
    };

} // namespace osgEarth

#endif // OSGEARTH_OVERLAY_NODE_H