/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
* Copyright 2018 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* 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/>
*/

#include <osgGA/GUIEventHandler>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgEarth/MapNode>
#include <osgEarth/Registry>
#include <osgEarth/ObjectIndex>
#include <osgEarthUtil/EarthManipulator>
#include <osgEarthUtil/ExampleResources>
#include <osgEarthUtil/Controls>
#include <osgEarthUtil/RTTPicker>
#include <osgEarthFeatures/Feature>
#include <osgEarthFeatures/FeatureIndex>

#define LC "[feature_query] "

using namespace osgEarth::Util;
using namespace osgEarth::Util::Controls;
using namespace osgEarth::Features;

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

/**
 * Creates a simple user interface for the demo.
 */
Container* createUI()
{
    VBox* vbox = new VBox();
    vbox->setVertAlign( Control::ALIGN_TOP );
    vbox->setHorizAlign( Control::ALIGN_RIGHT );
    vbox->addControl( new LabelControl("Feature Query Demo", Color::Yellow) );
    vbox->addControl( new LabelControl("Click on a feature to see its attributes.") );
    return vbox;
}

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

/**
 * Query Callback that displays the targeted feature's attributes in a
 * user interface grid control.
 */

class ReadoutCallback : public RTTPicker::Callback
{
public:
    ReadoutCallback(ControlCanvas* container) : _lastFID( ~0 )
    {
        _grid = new Grid();
        _grid->setBackColor( osg::Vec4(0,0,0,0.7f) );
        container->addControl( _grid );
    }

    void onHit(ObjectID id)
    {
        FeatureIndex* index = Registry::objectIndex()->get<FeatureIndex>(id).get();
        Feature* feature = index ? index->getFeature( id ) : 0L;
        if ( feature && feature->getFID() != _lastFID )
        {
            _grid->clearControls();
            unsigned r=0;

            _grid->setControl( 0, r, new LabelControl("FID", Color::Red) );
            _grid->setControl( 1, r, new LabelControl(Stringify()<<feature->getFID(), Color::White) );
            ++r;

            const AttributeTable& attrs = feature->getAttrs();
            for( AttributeTable::const_iterator i = attrs.begin(); i != attrs.end(); ++i, ++r )
            {
                _grid->setControl( 0, r, new LabelControl(i->first, 14.0f, Color::Yellow) );
                _grid->setControl( 1, r, new LabelControl(i->second.getString(), 14.0f, Color::White) );
            }
            if ( !_grid->visible() )
                _grid->setVisible( true );
        
            _lastFID = feature->getFID();
        }
    }

    void onMiss()
    {
        _grid->setVisible(false);
        _lastFID = 0u;
    }

    bool accept(const osgGA::GUIEventAdapter& ea, const osgGA::GUIActionAdapter& aa) 
    {
        return ea.getEventType() == ea.RELEASE; // click
    }

    Grid*     _grid;
    FeatureID _lastFID;
};

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

int
main(int argc, char** argv)
{
    osg::ArgumentParser arguments(&argc,argv);

    // a basic OSG viewer
    osgViewer::Viewer viewer(arguments);

    // install our default manipulator (do this before using MapNodeHelper)
    viewer.setCameraManipulator( new EarthManipulator() );

    // load an earth file, and support all or our example command-line options
    // and earth file <external> tags
    osg::Group* root = MapNodeHelper().load( arguments, &viewer, createUI() );
    if ( root )
    {
        viewer.setSceneData( root );

        MapNode* mapNode = MapNode::findMapNode( root );
        if ( mapNode )
        {
            // Install the query tool.
            RTTPicker* picker = new RTTPicker();
            viewer.addEventHandler( picker );
            picker->addChild( mapNode );

            // Install a readout for feature metadata.
            ControlCanvas* canvas = ControlCanvas::getOrCreate(&viewer);
            picker->setDefaultCallback( new ReadoutCallback(canvas) );
        }

        return viewer.run();
    }
    else
    {
        OE_NOTICE 
            << "\nUsage: " << argv[0] << " file.earth" << std::endl
            << MapNodeHelper().usage() << std::endl;
    }
}
