#include <stdio.h>

#include <osg/ArgumentParser>
#include <osg/ApplicationUsage>
#include <osg/Group>
#include <osg/Notify>
#include <osg/Vec3>
#include <osg/Geometry>
#include <osg/Texture2D>

#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgDB/FileNameUtils>
#include <osgDB/ReaderWriter>

#include <osgUtil/Optimizer>

#include <osgProducer/Viewer>

#include <iostream>

#include "OrientationConverter.h"
#include "GeoSet.h"

typedef std::vector<std::string> FileNameList;


////////////////////////////////////////////////////////////////////////////
// Convert GeoSet To Geometry Visitor.
////////////////////////////////////////////////////////////////////////////

/** ConvertGeoSetsToGeometryVisitor all the old GeoSet Drawables to the new Geometry Drawables.*/
class ConvertGeoSetsToGeometryVisitor : public osg::NodeVisitor
{
public:

    ConvertGeoSetsToGeometryVisitor():osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}

    virtual void apply(osg::Geode& geode)
    {
        for(unsigned int i=0;i<geode.getNumDrawables();++i)
        {
            osg::GeoSet* geoset = dynamic_cast<osg::GeoSet*>(geode.getDrawable(i));
            if (geoset)
            {
                osg::Geometry* geom = geoset->convertToGeometry();
                if (geom)
                {
                    osg::notify(osg::NOTICE)<<"Successfully converted GeoSet to Geometry"<<std::endl;
                    geode.replaceDrawable(geoset,geom);
                }
                else
                {
                    osg::notify(osg::NOTICE)<<"*** Failed to convert GeoSet to Geometry"<<std::endl;
                }

            }
        }
    }

    virtual void apply(osg::Node& node) { traverse(node); }

};

class GraphicsContext {
    public:
        GraphicsContext()
        {
            rs = new Producer::RenderSurface;
            rs->setWindowRectangle(0,0,1,1);
            rs->useBorder(false);
            rs->useConfigEventThread(false);
            rs->realize();
            std::cout<<"Realized window"<<std::endl;
        }

        virtual ~GraphicsContext()
        {
        }
        
    private:
        Producer::ref_ptr<Producer::RenderSurface> rs;
};

class CompressTexturesVisitor : public osg::NodeVisitor
{
public:

    CompressTexturesVisitor():osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}

    virtual void apply(osg::Node& node)
    {
        if (node.getStateSet()) apply(*node.getStateSet());
        traverse(node);
    }
    
    virtual void apply(osg::Geode& node)
    {
        if (node.getStateSet()) apply(*node.getStateSet());
        
        for(unsigned int i=0;i<node.getNumDrawables();++i)
        {
            osg::Drawable* drawable = node.getDrawable(i);
            if (drawable && drawable->getStateSet()) apply(*drawable->getStateSet());
        }
        
        traverse(node);
    }
    
    virtual void apply(osg::StateSet& stateset)
    {
        // search for the existance of any texture object attributes
        for(unsigned int i=0;i<stateset.getTextureAttributeList().size();++i)
        {
            osg::Texture2D* texture = dynamic_cast<osg::Texture2D*>(stateset.getTextureAttribute(i,osg::StateAttribute::TEXTURE));
            if (texture)
            {
                _textureSet.insert(texture);
            }
        }
    }
    
    void compress()
    {
        GraphicsContext context;

        osg::ref_ptr<osg::State> state = new osg::State;

        for(TextureSet::iterator itr=_textureSet.begin();
            itr!=_textureSet.end();
            ++itr)
        {
            osg::Texture2D* texture = const_cast<osg::Texture2D*>(itr->get());
            osg::Image* image = texture->getImage();
            if (image && 
                (image->getPixelFormat()==GL_RGB || image->getPixelFormat()==GL_RGBA) &&
                (image->s()>=32 && image->t()>=32))
            {
                texture->setInternalFormatMode(osg::Texture::USE_S3TC_DXT3_COMPRESSION);

                // get OpenGL driver to create texture from image.
                texture->apply(*state);

                image->readImageFromCurrentTexture(0,true);

                texture->setInternalFormatMode(osg::Texture::USE_IMAGE_DATA_FORMAT);
            }
        }
    }
    
    typedef std::set< osg::ref_ptr<osg::Texture2D> > TextureSet;
    TextureSet _textureSet;
    

};


static void usage( const char *prog, const char *msg )
{
    if (msg)
    {
        osg::notify(osg::NOTICE)<< std::endl;
        osg::notify(osg::NOTICE) << msg << std::endl;
    }
    osg::notify(osg::NOTICE)<< std::endl;
    osg::notify(osg::NOTICE)<<"usage:"<< std::endl;
    osg::notify(osg::NOTICE)<<"    " << prog << " [options] infile1 [infile2 ...] outfile"<< std::endl;
    osg::notify(osg::NOTICE)<< std::endl;
    osg::notify(osg::NOTICE)<<"options:"<< std::endl;
    osg::notify(osg::NOTICE)<<"    -O option          - ReaderWriter option"<< std::endl;
    osg::notify(osg::NOTICE)<<"    --compress         - Compress textures."<< std::endl;
    osg::notify(osg::NOTICE)<<"    -l libraryName     - load plugin of name libraryName"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         i.e. -l osgdb_pfb"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         Useful for loading reader/writers which can load"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         other file formats in addition to its extension."<< std::endl;
    osg::notify(osg::NOTICE)<<"    -e extensionName   - load reader/wrter plugin for file extension"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         i.e. -e pfb"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         Useful short hand for specifying full library name as"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         done with -l above, as it automatically expands to the"<< std::endl;
    osg::notify(osg::NOTICE)<<"                         full library name appropriate for each platform."<< std::endl;
    osg::notify(osg::NOTICE)<<"    -o orientation     - Convert geometry from input files to output files."<< std::endl;
    osg::notify(osg::NOTICE)<<
                              "                         Format of orientation argument must be the following:\n"
                              "\n"
                              "                             X1,Y1,Z1-X2,Y2,Z2\n"
                              "                         or\n"
                              "                             degrees-A0,A1,A2\n"
                              "\n"
                              "                         where X1,Y1,Z1 represent the UP vector in the input\n"
                              "                         files and X2,Y2,Z2 represent the UP vector of the\n"
                              "                         output file, or degrees is the rotation angle in degrees\n"
                              "                         around axis (A0,A1,A2).  For example, to convert a model\n"
                              "                         built in a Y-Up coordinate system to a model with a Z-up\n"
                              "                         coordinate system, the argument may look like\n"
                              "\n"
                              "                             0,1,0-0,0,1"
                              "\n"
                              "                          or\n"
                              "                             -90-1,0,0\n"
                              "\n" << std::endl;
    osg::notify(osg::NOTICE)<<"    -t translation     - Convert spatial position of output files.  Format of\n"
                              "                         translation argument must be the following :\n"
                              "\n"
                              "                             X,Y,Z\n"
                              "\n"
                              "                         where X, Y, and Z represent the coordinates of the\n"
                              "                         absolute position in world space\n"
                              << std::endl;
    osg::notify(osg::NOTICE)<<"    -s scale           - Scale size of model.  Scale argument must be the \n"
                              "                         following :\n"
                              "\n"
                              "                             SX,SY,SZ\n"
                              "\n"
                              "                         where SX, SY, and SZ represent the scale factors\n"
                              "                         Caution: Scaling will be done in destination orientation\n"
                              << std::endl;
}


int main( int argc, char **argv )
{
    // use an ArgumentParser object to manage the program arguments.
    osg::ArgumentParser arguments(&argc,argv);
    
    // set up the usage document, in case we need to print out how to use this program.
    arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");

    // if user request help write it out to cout.
    if (arguments.read("-h") || arguments.read("--help"))
    { 
        usage( arguments.getApplicationName().c_str(), 0 );
        //arguments.getApplicationUsage()->write(std::cout);
        return 1;
    }

    
    if (arguments.argc()<=1)
    {
        arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
        return 1;
    }

    FileNameList fileNames;
    OrientationConverter oc;
    bool do_convert = false;
    bool compressTextures = false;

    std::string str;
    while (arguments.read("-O",str))
    {
        osgDB::ReaderWriter::Options* options = new osgDB::ReaderWriter::Options;
        options->setOptionString(str);
        osgDB::Registry::instance()->setOptions(options);
    }

    std::string ext;
    while (arguments.read("-e",ext))
    {
        std::string libName = osgDB::Registry::instance()->createLibraryNameForExtension(ext);
        osgDB::Registry::instance()->loadLibrary(libName);
    }
    
    std::string libName;
    while (arguments.read("-l",libName))
    {
        osgDB::Registry::instance()->loadLibrary(libName);
    }

    while (arguments.read("-t",str))
    {
        osg::Vec3 trans(0,0,0);
        if( sscanf( str.c_str(), "%f,%f,%f",
                &trans[0], &trans[1], &trans[2] ) != 3 )
        {
            usage( argv[0], "Translation argument format incorrect." );
            return false;
        }
        oc.setTranslation( trans );
        do_convert = true;
    }

    while (arguments.read("-o",str))
    {
        osg::Vec3 from, to;
        if( sscanf( str.c_str(), "%f,%f,%f-%f,%f,%f",
                &from[0], &from[1], &from[2],
                &to[0], &to[1], &to[2]  )
            != 6 )
        {
            float degrees;
            osg::Vec3 axis;
            // Try deg-axis format
            if( sscanf( str.c_str(), "%f-%f,%f,%f",
                    &degrees, &axis[0], &axis[1], &axis[2]  ) != 4 )
            {
                usage( argv[0], "Orientation argument format incorrect." );
                return false;
            }
            else
            {
                oc.setRotation( degrees, axis );
                do_convert = true;
            }
        }
        else
        {
            oc.setRotation( from, to );
            do_convert = true;
        }

    }    

    while (arguments.read("--compressed"))
    {
        compressTextures = true;
    }

    // any option left unread are converted into errors to write out later.
    arguments.reportRemainingOptionsAsUnrecognized();

    // report any errors if they have occured when parsing the program aguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
        return 1;
    }

    for(int pos=1;pos<arguments.argc();++pos)
    {
        if (!arguments.isOption(pos))
        {
            fileNames.push_back(arguments[pos]);
        }
    }


    std::string fileNameOut("converted.osg");
    if (fileNames.size()>1)
    {
        fileNameOut = fileNames.back();
        fileNames.pop_back();
    }

    osg::ref_ptr<osg::Node> root = osgDB::readNodeFiles(fileNames);

    if ( root.valid() )
    {
        // convert the old style GeoSet to Geometry
        ConvertGeoSetsToGeometryVisitor cgtg;
        if( root.valid() ) root->accept(cgtg);
    
        // optimize the scene graph, remove rendundent nodes and state etc.
        osgUtil::Optimizer optimizer;
        optimizer.optimize(root.get());
        
        if( do_convert )
            root = oc.convert( root.get() );
            
        if (compressTextures)
        {
            std::string ext = osgDB::getFileExtension(fileNameOut);
            if (ext=="ive")
            {
                CompressTexturesVisitor ctv;
                root->accept(ctv);
                ctv.compress();
            }
            else
            {
                std::cout<<"Warning: compressing texture only supported when outputing to .ive"<<std::endl;
            }
        }

        if (osgDB::writeNodeFile(*root,fileNameOut))
        {
            osg::notify(osg::NOTICE)<<"Data written to '"<<fileNameOut<<"'."<< std::endl;
        }
    }
    else
    {
        osg::notify(osg::NOTICE)<<"Error no data loaded."<< std::endl;
        return 1;
    }

    return 0;
}