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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2013 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 OSGEARTHUTIL_FEATURE_QUERY_TOOL_H
#define OSGEARTHUTIL_FEATURE_QUERY_TOOL_H 1

#include <osgEarthUtil/Common>
#include <osgEarth/MapNode>
#include <osgEarth/MapNodeObserver>
#include <osgEarth/GeoData>
#include <osgEarthFeatures/Feature>
#include <osgEarthFeatures/FeatureSource>
#include <osgEarthFeatures/FeatureSourceIndexNode>
#include <osgEarthUtil/Controls>
#include <osgGA/GUIEventHandler>
#include <osg/View>

namespace osgEarth { namespace Util
{
    using namespace osgEarth;
    using namespace osgEarth::Features;

    /**
     * Tool that let you query the map for Features generated from a FeatureSource.
     *
     * By default, an unmodified left-click will activate a query. You can replace
     * this test by calling setInputPredicate().
     */
    class OSGEARTHUTIL_EXPORT FeatureQueryTool : public osgGA::GUIEventHandler,
                                                 public MapNodeObserver
    {
    public:

        struct Callback : public osg::Referenced
        {
            struct EventArgs 
            {
                const osgGA::GUIEventAdapter*  _ea;
                osgGA::GUIActionAdapter*       _aa;
                osg::Vec3d                     _worldPoint;
            };

            // called when a valid feature is found under the mouse coords
            virtual void onHit( FeatureSourceIndexNode* index, FeatureID fid, const EventArgs& args ) { }

            // called when no feature is found under the mouse coords
            virtual void onMiss( const EventArgs& args ) { }
        };

        /**
         * Interface for a custom input test.
         */
        class InputPredicate : public osg::Referenced
        {
        public:
            // return true to active a query under the mouse cursor.
            virtual bool accept( const osgGA::GUIEventAdapter& ea ) =0;
        };

    public:
        /**
         * Constructs a new feature query tool.
         *
         * @param mapNode
         *      Map node containing feature data to query
         * @param callbackToAdd
         *      (optional) convenience; calls addCallback with this parameter
         */
        FeatureQueryTool( 
            MapNode*  mapNode,
            Callback* callbackToAdd =0L );

        /** dtor */
        virtual ~FeatureQueryTool() { }

        /**
         * Adds a feature query callback.
         */
        void addCallback( Callback* callback );

        /**
         * Removes a feature query callback.
         */

        /**
         * Sets a custom input test. By default, the action is a left-click.
         */
        void setInputPredicate( InputPredicate* value ) { _inputPredicate = value; }


    public: // GUIEventHandler

        virtual bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa );


    public: // MapNodeObserver

        virtual void setMapNode( MapNode* mapNode );

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


    protected:
        osg::observer_ptr<MapNode> _mapNode;
        bool                       _mouseDown;
        float                      _mouseDownX, _mouseDownY;

        osg::ref_ptr<InputPredicate> _inputPredicate;

        typedef std::vector< osg::observer_ptr<Callback> > Callbacks;
        Callbacks _callbacks;
    };

    //--------------------------------------------------------------------

    /**
     * Sample callback that will highlight a feature upon a query hit.
     */
    class OSGEARTHUTIL_EXPORT FeatureHighlightCallback : public FeatureQueryTool::Callback
    {
    public:
        virtual void onHit( FeatureSourceIndexNode* index, FeatureID fid, const EventArgs& args );

        virtual void onMiss( const EventArgs& args );

    protected:
        void clear();

        struct Selection {
            osg::observer_ptr<FeatureSourceIndexNode> _index;
            osg::observer_ptr<osg::Group>             _group;
            FeatureID                                 _fid;
            bool operator < ( const Selection& rhs ) const { return _fid < rhs._fid; }
        };
        typedef std::set<Selection> SelectionSet;
        SelectionSet _selections;

        /** dtor */
        virtual ~FeatureHighlightCallback() { }
    };


    //--------------------------------------------------------------------

    /**
     * Sample callback that will display feature attributes upon a query hit.
     */
    class OSGEARTHUTIL_EXPORT FeatureReadoutCallback : public FeatureQueryTool::Callback
    {
    public:
        FeatureReadoutCallback( Controls::Container* container );

    public:
        virtual void onHit( FeatureSourceIndexNode* index, FeatureID fid, const EventArgs& args );

        virtual void onMiss( const EventArgs& args );

    protected:
        void clear();
        Controls::Grid* _grid;

        /** dtor */
        virtual ~FeatureReadoutCallback() { }
    };


} } // namespace osgEarthUtil

#endif // OSGEARTHUTIL_FEATURE_QUERY_TOOL_H