#include <osg/GL>
#include <osgGLUT/glut>
#include <osgGLUT/Viewer>

#include <osg/Notify>

#include <osg/Texture>
#include <osg/TexEnv>
#include <osg/TexGen>

#include <osgDB/Registry>
#include <osgDB/ReadFile>

#include <osgGA/TrackballManipulator>
#include <osgGA/FlightManipulator>
#include <osgGA/DriveManipulator>


#include <osgUtil/Optimizer>

void write_usage(std::ostream& out,const std::string& name)
{
    out << std::endl;
    out <<"usage:"<< std::endl;
    out <<"    "<<name<<" [options] infile1 [infile2 ...]"<< std::endl;
    out << std::endl;
    out <<"options:"<< std::endl;
    out <<"    -l libraryName      - load plugin of name libraryName"<< std::endl;
    out <<"                          i.e. -l osgdb_pfb"<< std::endl;
    out <<"                          Useful for loading reader/writers which can load"<< std::endl;
    out <<"                          other file formats in addition to its extension."<< std::endl;
    out <<"    -e extensionName    - load reader/wrter plugin for file extension"<< std::endl;
    out <<"                          i.e. -e pfb"<< std::endl;
    out <<"                          Useful short hand for specifying full library name as"<< std::endl;
    out <<"                          done with -l above, as it automatically expands to"<< std::endl;
    out <<"                          the full library name appropriate for each platform."<< std::endl;
    out <<std::endl;
    out <<"    -stereo             - switch on stereo rendering, using the default of,"<< std::endl;
    out <<"                          ANAGLYPHIC or the value set in the OSG_STEREO_MODE "<< std::endl;
    out <<"                          environmental variable. See doc/stereo.html for "<< std::endl;
    out <<"                          further details on setting up accurate stereo "<< std::endl;
    out <<"                          for your system. "<< std::endl;
    out <<"    -stereo ANAGLYPHIC  - switch on anaglyphic(red/cyan) stereo rendering."<< std::endl;
    out <<"    -stereo QUAD_BUFFER - switch on quad buffered stereo rendering."<< std::endl;
    out <<std::endl;
    out <<"    -stencil            - use a visual with stencil buffer enabled, this "<< std::endl;
    out <<"                          also allows the depth complexity statistics mode"<< std::endl;
    out <<"                          to be used (press 'p' three times to cycle to it)."<< std::endl;
    out << std::endl;
}


int main( int argc, char **argv )
{

    // initialize the GLUT
    glutInit( &argc, argv );

    if (argc<2)
    {
        write_usage(std::cout,argv[0]);
        return 0;
    }
    
    // create the commandline args.
    std::vector<std::string> commandLine;
    for(int i=1;i<argc;++i) commandLine.push_back(argv[i]);
    

    // initialize the viewer.
    osgGLUT::Viewer viewer;
    viewer.setWindowTitle(argv[0]);

    // configure the viewer from the commandline arguments, and eat any
    // parameters that have been matched.
    viewer.readCommandLine(commandLine);
    
    // configure the plugin registry from the commandline arguments, and 
    // eat any parameters that have been matched.
    osgDB::readCommandLine(commandLine);

    // load the nodes from the commandline arguments.
    osg::Node* rootnode = osgDB::readNodeFiles(commandLine);
    if (!rootnode)
    {
//        write_usage(osg::notify(osg::NOTICE),argv[0]);
        return 1;
    }
    
    osg::Image* image = osgDB::readImageFile("reflect.rgb");
    if (image)
    {
        osg::Texture* texture = new osg::Texture;
        texture->setImage(image);

        osg::TexGen* texgen = new osg::TexGen;
        texgen->setMode(osg::TexGen::SPHERE_MAP);

        osg::TexEnv* texenv = new osg::TexEnv;
        texenv->setMode(osg::TexEnv::MODULATE);

        osg::StateSet* stateset = new osg::StateSet;
        stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
        stateset->setTextureAttributeAndModes(1,texgen,osg::StateAttribute::ON);
        stateset->setTextureAttribute(1,texenv);
        
        rootnode->setStateSet(stateset);
    }
    else
    {
        osg::notify(osg::NOTICE)<<"unable to load reflect map, model will not be mutlitextured"<<std::endl;
    }



    // run optimization over the scene graph
    osgUtil::Optimizer optimzer;
    optimzer.optimize(rootnode);
     
    // add a viewport to the viewer and attach the scene graph.
    viewer.addViewport( rootnode );
    
    // register trackball, flight and drive.
    viewer.registerCameraManipulator(new osgGA::TrackballManipulator);
    viewer.registerCameraManipulator(new osgGA::FlightManipulator);
    viewer.registerCameraManipulator(new osgGA::DriveManipulator);

    // open the viewer window.
    viewer.open();
    
    // fire up the event loop.
    viewer.run();

    return 0;
}