/* -*-c++-*- Present3D - Copyright (C) 1999-2006 Robert Osfield
 *
 * This software is open source and may be redistributed and/or modified under
 * the terms of the GNU General Public License (GPL) version 2.0.
 * The full license is in LICENSE.txt file included with this distribution,.
 *
 * This software 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
 * include LICENSE.txt for more details.
*/

#include <osg/Geometry>
#include <osg/Texture2D>
#include <osg/AutoTransform>
#include <osg/Notify>
#include <osg/io_utils>


#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgDB/FileNameUtils>
#include <osgUtil/Optimizer>

#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>

#include <OpenThreads/Thread>

#include <osgGA/GUIEventHandler>
#include <osgGA/TrackballManipulator>
#include <osgGA/FlightManipulator>
#include <osgGA/DriveManipulator>
#include <osgGA/KeySwitchMatrixManipulator>
#include <osgGA/AnimationPathManipulator>
#include <osgGA/TerrainManipulator>
#include <osgGA/AnimationPathManipulator>
#include <osgGA/StateSetManipulator>
#include <osgGA/MultiTouchTrackballManipulator>

#include <osgPresentation/SlideEventHandler>
#include <osgPresentation/Cursor>

#include "ReadShowFile.h"
#include "PointsEventHandler.h"
#include "Cluster.h"
#include "ExportHTML.h"
#include "SpellChecker.h"

#include <sstream>
#include <fstream>
#include <iostream>


#include <string.h>

#ifdef USE_SDL
    #include "SDLIntegration.h"
#endif

#ifdef OSG_LIBRARY_STATIC

    // include the plugins we need
    USE_OSGPLUGIN(ive)
    USE_OSGPLUGIN(osg)
    USE_OSGPLUGIN(osg2)
    USE_OSGPLUGIN(p3d)
    USE_OSGPLUGIN(paths)
    USE_OSGPLUGIN(rgb)
    USE_OSGPLUGIN(OpenFlight)
    USE_OSGPLUGIN(obj)

#ifdef USE_FREETYPE
    USE_OSGPLUGIN(freetype)
#endif

#ifdef USE_PNG
    USE_OSGPLUGIN(png)
#endif

#ifdef USE_JPEG
    USE_OSGPLUGIN(jpeg)
#endif

#ifdef USE_FFMPEG
    USE_OSGPLUGIN(ffmpeg)
#endif

#ifdef USE_POPPLER_CAIRO
    USE_OSGPLUGIN(pdf)
#endif

#ifdef USE_CURL
    USE_OSGPLUGIN(curl)
#endif

    USE_DOTOSGWRAPPER_LIBRARY(osg)
    USE_DOTOSGWRAPPER_LIBRARY(osgFX)
    USE_DOTOSGWRAPPER_LIBRARY(osgParticle)
    USE_DOTOSGWRAPPER_LIBRARY(osgShadow)
    USE_DOTOSGWRAPPER_LIBRARY(osgSim)
    USE_DOTOSGWRAPPER_LIBRARY(osgTerrain)
    USE_DOTOSGWRAPPER_LIBRARY(osgText)
    USE_DOTOSGWRAPPER_LIBRARY(osgViewer)
    USE_DOTOSGWRAPPER_LIBRARY(osgVolume)
    USE_DOTOSGWRAPPER_LIBRARY(osgWidget)

    USE_SERIALIZER_WRAPPER_LIBRARY(osg)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgAnimation)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgFX)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgManipulator)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgParticle)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgShadow)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgSim)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgTerrain)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgText)
    USE_SERIALIZER_WRAPPER_LIBRARY(osgVolume)

    // include the platform specific GraphicsWindow implementation.
    USE_GRAPHICSWINDOW()

#endif

static const char* s_version = "1.4 beta";

void setViewer(osgViewer::Viewer& viewer, float width, float height, float distance)
{
    double vfov = osg::RadiansToDegrees(atan2(height/2.0f,distance)*2.0);
    // double hfov = osg::RadiansToDegrees(atan2(width/2.0f,distance)*2.0);

    viewer.getCamera()->setProjectionMatrixAsPerspective( vfov, width/height, 0.1, 1000.0);

    OSG_INFO<<"setProjectionMatrixAsPerspective( "<<vfov<<", "<<width/height<<", "<<0.1<<", "<<1000.0<<");"<<std::endl;
}

class ForwardToDeviceEventHandler : public osgGA::GUIEventHandler {
public:
    ForwardToDeviceEventHandler(osgGA::Device* device, bool format_mouse_events) : osgGA::GUIEventHandler(), _device(device), _forwardMouseEvents(format_mouse_events) {}

    virtual bool handle (const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &aa, osg::Object *, osg::NodeVisitor *)
    {
        switch (ea.getEventType())
        {
            case osgGA::GUIEventAdapter::PUSH:
            case osgGA::GUIEventAdapter::RELEASE:
            case osgGA::GUIEventAdapter::MOVE:
            case osgGA::GUIEventAdapter::DRAG:
            case osgGA::GUIEventAdapter::SCROLL:
                if (_forwardMouseEvents)
                    _device->sendEvent(ea);
                break;

            default:
                _device->sendEvent(ea);
                break;
        }
        return false;
    }


    bool handle(osgGA::Event* event, osg::Object* object, osg::NodeVisitor* nv)
    {
        if (event->asGUIEventAdapter())
            return osgGA::GUIEventHandler::handle(event, object, nv);
        else
        {
            _device->sendEvent(*event);
            return false;
        }
    }


private:
    osg::ref_ptr<osgGA::Device> _device;
    bool _forwardMouseEvents;
};


class DumpEventHandler : public osgGA::GUIEventHandler {
public:
    DumpEventHandler() : osgGA::GUIEventHandler() {}

    virtual bool handle (const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &aa, osg::Object *, osg::NodeVisitor *)
    {
        switch (ea.getEventType())
        {
            case osgGA::GUIEventAdapter::FRAME:
                return false;
                break;
            case osgGA::GUIEventAdapter::PUSH:
                std::cout << "PUSH: ";
                break;
            case osgGA::GUIEventAdapter::RELEASE:
                std::cout << "RELEASE: ";
                break;
            case osgGA::GUIEventAdapter::MOVE:
                std::cout << "MOVE: ";
                break;
            case osgGA::GUIEventAdapter::DRAG:
                std::cout << "DRAG: ";
                break;
            case osgGA::GUIEventAdapter::SCROLL:
                std::cout << "SCROLL: ";
                break;
                break;

            default:
                std::cout << ea.getEventType() << " ";
                break;
        }
        std::cout << ea.getX() << "/" << ea.getY() << " " << ea.isMultiTouchEvent() << std::endl;
        return false;
    }


    bool handle(osgGA::Event* event, osg::Object* object, osg::NodeVisitor* nv)
    {
        if (event->asGUIEventAdapter())
            return osgGA::GUIEventHandler::handle(event, object, nv);
        else
        {
            return false;
        }
    }


private:
};



enum P3DApplicationType
{
    VIEWER,
    MASTER,
    SLAVE
};


void processLoadedModel(osg::ref_ptr<osg::Node>& loadedModel, int optimizer_options, const std::string& cursorFileName)
{
    if (!loadedModel) return;

#if !defined(OSG_GLES2_AVAILABLE) && !defined(OSG_GL3_AVAILABLE)

    // add back in enabling of the GL_ALPHA_TEST to get around the core OSG no longer setting it by default for opaque bins.
    // the alpha test is required for the volume rendering alpha clipping to work.
    loadedModel->getOrCreateStateSet()->setMode(GL_ALPHA_TEST, osg::StateAttribute::ON);
#endif

    // optimize the scene graph, remove redundant nodes and state etc.
    osgUtil::Optimizer optimizer;
    optimizer.optimize(loadedModel.get(), optimizer_options);

    if (!cursorFileName.empty())
    {
        osg::ref_ptr<osg::Group> group = new osg::Group;
        group->addChild(loadedModel.get());

        OSG_NOTICE<<"Creating Cursor"<<std::endl;
        group->addChild(new osgPresentation::Cursor(cursorFileName, 20.0f));

        loadedModel = group;
    }
}

void addDeviceTo(osgViewer::Viewer& viewer, const std::string& device_name, bool forward_mouse_events)
{
    osg::ref_ptr<osgGA::Device> dev = osgDB::readRefFile<osgGA::Device>(device_name);
    if (dev.valid())
    {
        OSG_INFO << "Adding Device : " << device_name << std::endl;
        viewer.addDevice(dev.get());

        if ((dev->getCapabilities() & osgGA::Device::SEND_EVENTS))
            viewer.getEventHandlers().push_front(new ForwardToDeviceEventHandler(dev.get(), forward_mouse_events));
    }
    else
    {
        OSG_WARN << "could not open device: " << device_name << 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 application for presenting 3D interactive slide shows.");
    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
    arguments.getApplicationUsage()->addCommandLineOption("-a","Turn auto stepping on by default");
    arguments.getApplicationUsage()->addCommandLineOption("-d <float>","Time duration in seconds between layers/slides");
    arguments.getApplicationUsage()->addCommandLineOption("-s <float> <float> <float>","width, height, distance and of the screen away from the viewer");
    arguments.getApplicationUsage()->addCommandLineOption("--viewer","Start Present3D as the viewer version.");
    arguments.getApplicationUsage()->addCommandLineOption("--authoring","Start Present3D as the authoring version, license required.");
    arguments.getApplicationUsage()->addCommandLineOption("--master","Start Present3D as the master version, license required.");
    arguments.getApplicationUsage()->addCommandLineOption("--slave","Start Present3D as the slave version, license required.");
    arguments.getApplicationUsage()->addCommandLineOption("--publishing","Start Present3D as the publishing version, license required.");
    arguments.getApplicationUsage()->addCommandLineOption("--timeDelayOnNewSlideWithMovies","Set the time delay on new slide with movies, done to allow movie threads to get in sync with rendering thread.");
    arguments.getApplicationUsage()->addCommandLineOption("--targetFrameRate","Set the target frame rate, defaults to 80Hz.");
    arguments.getApplicationUsage()->addCommandLineOption("--version","Report the Present3D version.");
    arguments.getApplicationUsage()->addCommandLineOption("--print <filename>","Print out slides to a series of image files.");
    arguments.getApplicationUsage()->addCommandLineOption("--html <filename>","Print out slides to a series of html & image files.");
    arguments.getApplicationUsage()->addCommandLineOption("--loop","Switch on looping of presentation.");
    arguments.getApplicationUsage()->addCommandLineOption("--devices","Print the Video input capability via QuickTime and exit.");
    arguments.getApplicationUsage()->addCommandLineOption("--forwardMouseEvents","forward also mouse/touch-events to the devices");
    arguments.getApplicationUsage()->addCommandLineOption("--suppressEnvTags", "suppresses all found ENV-tags in the presentation");

    // add alias from xml to p3d to provide backwards compatibility for old p3d files.
    osgDB::Registry::instance()->addFileExtensionAlias("xml","p3d");

    // if user requests devices video capability.
    if (arguments.read("-devices") || arguments.read("--devices"))
    {
        // Force load QuickTime plugin, probe video capability, exit
        osgDB::readRefImageFile("devices.live");
        return 1;
    }

    bool suppress_env_tags = false;
    if (arguments.read("--suppressEnvTags"))
        suppress_env_tags = true;

    // read any env vars from presentations before we create viewer to make sure the viewer
    // utilises these env vars
    if (!suppress_env_tags && p3d::readEnvVars(arguments))
    {
        osg::DisplaySettings::instance()->readEnvironmentalVariables();
    }

    // set up any logins required for http access
    std::string url, username, password;
    while(arguments.read("--login",url, username, password))
    {
        if (!osgDB::Registry::instance()->getAuthenticationMap())
        {
            osgDB::Registry::instance()->setAuthenticationMap(new osgDB::AuthenticationMap);
            osgDB::Registry::instance()->getAuthenticationMap()->addAuthenticationDetails(
                url,
                new osgDB::AuthenticationDetails(username, password)
            );
        }
    }



#ifdef USE_SDL
    SDLIntegration sdlIntegration;

    osg::notify(osg::INFO)<<"USE_SDL"<<std::endl;
#endif

    bool doSetViewer = true;
    std::string configurationFile;

    // check env vars for configuration file
    const char* str = getenv("PRESENT3D_CONFIG_FILE");
    if (!str) str = getenv("OSG_CONFIG_FILE");
    if (str) configurationFile = str;

    // check command line parameters for configuration file.
    while (arguments.read("-c",configurationFile)) {}

    osg::Vec4 clearColor(0.0f,0.0f,0.0f,0.0f);

    while (arguments.read("--clear-color",clearColor[0],clearColor[1],clearColor[2],clearColor[3])) {}

    std::string filename;
    if (arguments.read("--spell-check",filename))
    {
        p3d::SpellChecker spellChecker;
        spellChecker.checkP3dXml(filename);
        return 1;
    }

    if (arguments.read("--strip-text",filename))
    {
        p3d::XmlPatcher patcher;
        // patcher.stripP3dXml(filename, osg::notify(osg::NOTICE));

        osg::ref_ptr<osgDB::XmlNode> newNode = patcher.simplifyP3dXml(filename);
        if (newNode.valid())
        {
            newNode->write(std::cout);
        }
        return 1;
    }

    std::string lhs_filename, rhs_filename;
    if (arguments.read("--merge",lhs_filename, rhs_filename))
    {
        p3d::XmlPatcher patcher;
        osg::ref_ptr<osgDB::XmlNode> newNode = patcher.mergeP3dXml(lhs_filename, rhs_filename);
        if (newNode.valid())
        {
            newNode->write(std::cout);
        }
        return 1;
    }


    // construct the viewer.
    osgViewer::Viewer viewer(arguments);

    // set clear colour to black by default.
    viewer.getCamera()->setClearColor(clearColor);

    if (!configurationFile.empty())
    {
        viewer.readConfiguration(configurationFile);
        doSetViewer = false;
    }

    bool forwardMouseEvents = false;
    if (arguments.read("--forwardMouseEvents"))
        forwardMouseEvents = true;

    const char* p3dDevice = getenv("P3D_DEVICE");
    if (p3dDevice)
    {
        osgDB::StringList devices;
        osgDB::split(p3dDevice, devices);
        for(osgDB::StringList::iterator i = devices.begin(); i != devices.end(); ++i)
        {
            addDeviceTo(viewer, *i, forwardMouseEvents);
        }
    }


    std::string device;
    while (arguments.read("--device", device))
    {
        addDeviceTo(viewer, device, forwardMouseEvents);

    }

    if (arguments.read("--http-control"))
    {

        std::string server_address = "localhost";
        std::string server_port = "8080";
        std::string document_root = "htdocs";

        while (arguments.read("--http-server-address", server_address)) {}
        while (arguments.read("--http-server-port", server_port)) {}
        while (arguments.read("--http-document-root", document_root)) {}

        osg::ref_ptr<osgDB::Options> device_options = new osgDB::Options("documentRegisteredHandlers");

        osg::ref_ptr<osgGA::Device> rest_http_device = osgDB::readRefFile<osgGA::Device>(server_address+":"+server_port+"/"+document_root+".resthttp", device_options.get());
        if (rest_http_device.valid())
        {
            viewer.addDevice(rest_http_device.get());
        }
    }

    // set up stereo masks

    viewer.getCamera()->setCullMaskLeft(0x00000001);
    viewer.getCamera()->setCullMaskRight(0x00000002);

    bool assignLeftCullMaskForMono = true;
    if (assignLeftCullMaskForMono)
    {
        viewer.getCamera()->setCullMask(viewer.getCamera()->getCullMaskLeft());
    }
    else
    {
        viewer.getCamera()->setCullMask(0xffffffff);
    }

    // set up the camera manipulators.
    {
        osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;

        keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::MultiTouchTrackballManipulator() );
        keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
        keyswitchManipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
        keyswitchManipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );

        std::string pathfile;
        char keyForAnimationPath = '5';
        while (arguments.read("-p",pathfile))
        {
            osgGA::AnimationPathManipulator* apm = new osgGA::AnimationPathManipulator(pathfile);
            if (apm || !apm->valid())
            {
                unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
                keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
                keyswitchManipulator->selectMatrixManipulator(num);
                ++keyForAnimationPath;
            }
        }

        viewer.setCameraManipulator( keyswitchManipulator.get() );
    }

    //viewer.getEventHandlers().push_front(new DumpEventHandler());

    // add the state manipulator
    osg::ref_ptr<osgGA::StateSetManipulator> ssManipulator = new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet());
    ssManipulator->setKeyEventToggleTexturing('e');
    viewer.addEventHandler( ssManipulator.get() );

    // add the state manipulator
    viewer.addEventHandler( new osgViewer::StatsHandler() );

    viewer.addEventHandler( new osgViewer::WindowSizeHandler() );

    // neeed to address.
    // viewer.getScene()->getUpdateVisitor()->setTraversalMode(osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN);


    const char* p3dCursor = getenv("P3D_CURSOR");
    std::string cursorFileName( p3dCursor ? p3dCursor : "");
    while (arguments.read("--cursor",cursorFileName)) {}

    const char* p3dShowCursor = getenv("P3D_SHOW_CURSOR");
    std::string showCursor( p3dShowCursor ? p3dShowCursor : "YES");
    while (arguments.read("--show-cursor")) { showCursor="YES"; }
    while (arguments.read("--hide-cursor")) { showCursor="NO"; }

    bool hideCursor = (showCursor=="No" || showCursor=="NO" || showCursor=="no");

    while (arguments.read("--set-viewer")) { doSetViewer = true; }

    while (arguments.read("--no-set-viewer")) { doSetViewer = false; }

    // if we want to hide the cursor override the custom cursor.
    if (hideCursor) cursorFileName.clear();


    // cluster related entries.
    int socketNumber=8100;
    while (arguments.read("-n",socketNumber)) {}

    float camera_fov=-1.0f;
    while (arguments.read("-f",camera_fov)) {}

    float camera_offset=45.0f;
    while (arguments.read("-o",camera_offset)) {}


    std::string exportName;
    while (arguments.read("--print",exportName)) {}

    while (arguments.read("--html",exportName)) {}

    // read any time delay argument.
    float timeDelayBetweenSlides = 1.0f;
    while (arguments.read("-d",timeDelayBetweenSlides)) {}

    bool autoSteppingActive = false;
    while (arguments.read("-a")) autoSteppingActive = true;

    bool loopPresentation = false;
    while (arguments.read("--loop")) loopPresentation = true;

    {
        // set update hte default traversal mode settings for update visitor
        // default to osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN.
        osg::NodeVisitor::TraversalMode updateTraversalMode = osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN; // viewer.getUpdateVisitor()->getTraversalMode();

        const char* p3dUpdateStr = getenv("P3D_UPDATE");
        if (p3dUpdateStr)
        {
            std::string updateStr(p3dUpdateStr);
            if (updateStr=="active" || updateStr=="Active" || updateStr=="ACTIVE") updateTraversalMode = osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN;
            else if (updateStr=="all" || updateStr=="All" || updateStr=="ALL") updateTraversalMode = osg::NodeVisitor::TRAVERSE_ALL_CHILDREN;
        }

        while(arguments.read("--update-active")) updateTraversalMode = osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN;
        while(arguments.read("--update-all")) updateTraversalMode = osg::NodeVisitor::TRAVERSE_ALL_CHILDREN;

        viewer.getUpdateVisitor()->setTraversalMode(updateTraversalMode);
    }


    // register the slide event handler - which moves the presentation from slide to slide, layer to layer.
    osg::ref_ptr<osgPresentation::SlideEventHandler> seh = new osgPresentation::SlideEventHandler(&viewer);
    viewer.addEventHandler(seh.get());

    seh->setAutoSteppingActive(autoSteppingActive);
    seh->setTimeDelayBetweenSlides(timeDelayBetweenSlides);
    seh->setLoopPresentation(loopPresentation);

    double targetFrameRate = 80.0;
    while (arguments.read("--targetFrameRate",targetFrameRate)) {}


    // set the time delay
    float timeDelayOnNewSlideWithMovies = 0.4f;
    while (arguments.read("--timeDelayOnNewSlideWithMovies",timeDelayOnNewSlideWithMovies)) {}
    seh->setTimeDelayOnNewSlideWithMovies(timeDelayOnNewSlideWithMovies);

    // set up optimizer options
    unsigned int optimizer_options = osgUtil::Optimizer::DEFAULT_OPTIMIZATIONS;
    bool release_and_compile = false;
    while (arguments.read("--release-and-compile"))
    {
        release_and_compile = true;
    }
    seh->setReleaseAndCompileOnEachNewSlide(release_and_compile);
    if (release_and_compile)
    {
        // make sure that imagery stays around after being applied to textures.
        viewer.getDatabasePager()->setUnrefImageDataAfterApplyPolicy(true,false);
        optimizer_options &= ~osgUtil::Optimizer::OPTIMIZE_TEXTURE_SETTINGS;
    }
//
//     osgDB::Registry::instance()->getOrCreateDatabasePager()->setUnrefImageDataAfterApplyPolicy(true,false);
//     optimizer_options &= ~osgUtil::Optimizer::OPTIMIZE_TEXTURE_SETTINGS;
//     osg::Texture::getTextureObjectManager()->setExpiryDelay(0.0f);
//     osgDB::Registry::instance()->getOrCreateDatabasePager()->setExpiryDelay(1.0f);

    // register the handler for modifying the point size
    osg::ref_ptr<PointsEventHandler> peh = new PointsEventHandler;
    viewer.addEventHandler(peh.get());

    // add the screen capture handler
    std::string screenCaptureFilename = "screen_shot.jpg";
    while(arguments.read("--screenshot", screenCaptureFilename)) {}
    osg::ref_ptr<osgViewer::ScreenCaptureHandler::WriteToFile> writeFile = new osgViewer::ScreenCaptureHandler::WriteToFile(
        osgDB::getNameLessExtension(screenCaptureFilename),
        osgDB::getFileExtension(screenCaptureFilename) );
    osg::ref_ptr<osgViewer::ScreenCaptureHandler> screenCaptureHandler = new osgViewer::ScreenCaptureHandler(writeFile.get());
    screenCaptureHandler->setKeyEventTakeScreenShot('m');//osgGA::GUIEventAdapter::KEY_Print);
    screenCaptureHandler->setKeyEventToggleContinuousCapture('M');
    viewer.addEventHandler(screenCaptureHandler.get());

    // osg::DisplaySettings::instance()->setSplitStereoAutoAjustAspectRatio(false);

    float width = osg::DisplaySettings::instance()->getScreenWidth();
    float height = osg::DisplaySettings::instance()->getScreenHeight();
    float distance = osg::DisplaySettings::instance()->getScreenDistance();
    while (arguments.read("-s", width, height, distance))
    {
        osg::DisplaySettings::instance()->setScreenDistance(distance);
        osg::DisplaySettings::instance()->setScreenHeight(height);
        osg::DisplaySettings::instance()->setScreenWidth(width);
    }

    std::string outputFileName;
    while(arguments.read("--output",outputFileName)) {}


    // get details on keyboard and mouse bindings used by the viewer.
    viewer.getUsage(*arguments.getApplicationUsage());

    // if user request help write it out to cout.
    unsigned int helpType = 0;
    if ((helpType = arguments.readHelpType()))
    {
        arguments.getApplicationUsage()->write(std::cout, helpType);
        return 1;
    }

    P3DApplicationType P3DApplicationType = VIEWER;

    str = getenv("PRESENT3D_TYPE");
    if (str)
    {
        if (strcmp(str,"viewer")==0) P3DApplicationType = VIEWER;
        else if (strcmp(str,"master")==0) P3DApplicationType = MASTER;
        else if (strcmp(str,"slave")==0) P3DApplicationType = SLAVE;
    }

    while (arguments.read("--viewer")) { P3DApplicationType = VIEWER; }
    while (arguments.read("--master")) { P3DApplicationType = MASTER; }
    while (arguments.read("--slave")) { P3DApplicationType = SLAVE; }

    while (arguments.read("--version"))
    {
        std::string appTypeName = "invalid";
        switch(P3DApplicationType)
        {
            case(VIEWER): appTypeName = "viewer"; break;
            case(MASTER): appTypeName = "master"; break;
            case(SLAVE): appTypeName = "slave"; break;
        }

        osg::notify(osg::NOTICE)<<std::endl;
        osg::notify(osg::NOTICE)<<"Present3D "<<appTypeName<<" version : "<<s_version<<std::endl;
        osg::notify(osg::NOTICE)<<std::endl;

        return 0;
    }

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

    // report any errors if they have ocured when parsing the program aguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(osg::notify(osg::INFO));
        return 1;
    }


    // read files name from arguments.
    p3d::FileNameList xmlFiles, normalFiles;
    if (!p3d::getFileNames(arguments, xmlFiles, normalFiles))
    {
        osg::notify(osg::NOTICE)<<std::endl;
        osg::notify(osg::NOTICE)<<"No file specified, please specify and file to load."<<std::endl;
        osg::notify(osg::NOTICE)<<std::endl;
        return 1;
    }



    bool viewerInitialized = false;
    if (!xmlFiles.empty())
    {
        osg::ref_ptr<osg::Node> holdingModel = p3d::readHoldingSlide(xmlFiles.front());

        if (holdingModel.valid())
        {
            viewer.setSceneData(holdingModel.get());

            seh->selectSlide(0);

            if (!viewerInitialized)
            {
                // pass the global stateset to the point event handler so that it can
                // alter the point size of all points in the scene.
                peh->setStateSet(viewer.getCamera()->getOrCreateStateSet());

                // create the windows and run the threads.
                viewer.realize();

                if (doSetViewer) setViewer(viewer, width, height, distance);

                viewerInitialized = true;
            }

            seh->home();

            // render a frame
            viewer.frame();
        }
    }

    osg::Timer timer;
    osg::Timer_t start_tick = timer.tick();


    osg::ref_ptr<osgDB::ReaderWriter::Options> cacheAllOption = new osgDB::ReaderWriter::Options;
    if(suppress_env_tags)
        cacheAllOption->setPluginStringData("suppressEnvTags", "true");

    cacheAllOption->setObjectCacheHint(osgDB::ReaderWriter::Options::CACHE_ALL);
    osgDB::Registry::instance()->setOptions(cacheAllOption.get());

    // read the scene from the list of file specified commandline args.
    osg::ref_ptr<osg::Node> loadedModel = p3d::readShowFiles(arguments,cacheAllOption.get()); // osgDB::readNodeFiles(arguments, cacheAllOption.get());


    osgDB::Registry::instance()->setOptions( 0 );


    // if no model has been successfully loaded report failure.
    if (!loadedModel)
    {
        osg::notify(osg::INFO) << arguments.getApplicationName() <<": No data loaded" << std::endl;
        return 1;
    }

    osg::Timer_t end_tick = timer.tick();

    osg::notify(osg::INFO) << "Time to load = "<<timer.delta_s(start_tick,end_tick)<<std::endl;


    if (loadedModel->getNumDescriptions()>0)
    {
        for(unsigned int i=0; i<loadedModel->getNumDescriptions(); ++i)
        {
            const std::string& desc = loadedModel->getDescription(i);
            if (desc=="loop")
            {
                osg::notify(osg::NOTICE)<<"Enabling looping"<<std::endl;
                seh->setLoopPresentation(true);
            }
            else if (desc=="auto")
            {
                osg::notify(osg::NOTICE)<<"Enabling auto run"<<std::endl;
                seh->setAutoSteppingActive(true);
            }
        }
    }


    processLoadedModel(loadedModel, optimizer_options, cursorFileName);

    // set the scene to render
    viewer.setSceneData(loadedModel.get());

    if (!viewerInitialized)
    {
        // pass the global stateset to the point event handler so that it can
        // alter the point size of all points in the scene.
        peh->setStateSet(viewer.getCamera()->getOrCreateStateSet());

        // create the windows and run the threads.
        viewer.realize();

        if (doSetViewer) setViewer(viewer, width, height, distance);

        viewerInitialized = true;
    }




    // pass the model to the slide event handler so it knows which to manipulate.
    seh->set(loadedModel.get());
    seh->selectSlide(0);

    seh->home();

    if (!outputFileName.empty())
    {
        osgDB::writeNodeFile(*loadedModel,outputFileName);
        return 0;
    }


    if (!cursorFileName.empty() || hideCursor)
    {
        // have to add a frame in here to avoid problems with X11 threading issue on switching off the cursor
        // not yet sure why it makes a difference, but it at least fixes the crash that would otherwise occur
        // under X11.
        viewer.frame();

        // switch off the cursor
        osgViewer::Viewer::Windows windows;
        viewer.getWindows(windows);
        for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
            itr != windows.end();
            ++itr)
        {
            (*itr)->useCursor(false);
        }
    }

    double targetFrameTime = 1.0/targetFrameRate;

    if (exportName.empty())
    {
        // objects for managing the broadcasting and recieving of camera packets.
        CameraPacket cp;
        Broadcaster  bc;
        Receiver     rc;
        bc.setPort(static_cast<short int>(socketNumber));
        rc.setPort(static_cast<short int>(socketNumber));

        bool masterKilled = false;
        DataConverter scratchPad(1024);

        while( !viewer.done() && !masterKilled)
        {
            osg::Timer_t startFrameTick = osg::Timer::instance()->tick();

            if (viewer.getRunFrameScheme()!=osgViewer::ViewerBase::ON_DEMAND || seh->checkNeedToDoFrame())
            {
                // do the normal frame.

                // wait for all cull and draw threads to complete.
                viewer.advance();

    #if 0
                if (kmcb)
                {
                    double time = kmcb->getTime();
                    viewer.getFrameStamp()->setReferenceTime(time);
                }
    #endif

    #ifdef USE_SDL
                sdlIntegration.update(viewer);
    #endif

                if (P3DApplicationType==MASTER)
                {
                    // take camera zero as the guide.
                    osg::Matrix modelview(viewer.getCamera()->getViewMatrix());

                    cp.setPacket(modelview,viewer.getFrameStamp());

                    // cp.readEventQueue(viewer);

                    scratchPad.reset();
                    scratchPad.write(cp);

                    scratchPad.reset();
                    scratchPad.read(cp);

                    bc.setBuffer(scratchPad.startPtr(), scratchPad.numBytes());

                    std::cout << "bc.sync()"<<scratchPad.numBytes()<<std::endl;

                    bc.sync();
                }
                else if (P3DApplicationType==SLAVE)
                {
                    rc.setBuffer(scratchPad.startPtr(), scratchPad.numBytes());

                    rc.sync();

                    scratchPad.reset();
                    scratchPad.read(cp);

                    // cp.writeEventQueue(viewer);

                    if (cp.getMasterKilled())
                    {
                        std::cout << "Received master killed."<<std::endl;
                        // break out of while (!done) loop since we've now want to shut down.
                        masterKilled = true;
                    }
                }

                // update the scene by traversing it with the update visitor which will
                // call all node update callbacks and animations.
                viewer.eventTraversal();

                if (seh->getRequestReload())
                {
                    OSG_INFO<<"Reload requested"<<std::endl;
                    seh->setRequestReload(false);
                    int previous_ActiveSlide = seh->getActiveSlide();
                    int previous_ActiveLayer = seh->getActiveLayer();

                    // reset time so any event key generate

                    loadedModel = p3d::readShowFiles(arguments,cacheAllOption.get());
                    processLoadedModel(loadedModel, optimizer_options, cursorFileName);

                    if (!loadedModel)
                    {
                        return 0;
                    }

                    viewer.setSceneData(loadedModel.get());
                    seh->set(loadedModel.get());
                    seh->selectSlide(previous_ActiveSlide, previous_ActiveLayer);

                    continue;

                }

                // update the scene by traversing it with the update visitor which will
                // call all node update callbacks and animations.
                viewer.updateTraversal();

                if (P3DApplicationType==SLAVE)
                {
                    osg::Matrix modelview;
                    cp.getModelView(modelview,camera_offset);

                    viewer.getCamera()->setViewMatrix(modelview);
                }

                // fire off the cull and draw traversals of the scene.
                if(!masterKilled)
                    viewer.renderingTraversals();
            }

            // work out if we need to force a sleep to hold back the frame rate
            osg::Timer_t endFrameTick = osg::Timer::instance()->tick();
            double frameTime = osg::Timer::instance()->delta_s(startFrameTick, endFrameTick);
            if (frameTime < targetFrameTime) OpenThreads::Thread::microSleep(static_cast<unsigned int>(1000000.0*(targetFrameTime-frameTime)));
        }
    }
    else
    {
        ExportHTML::write(seh.get(), viewer, exportName);
    }

    return 0;
}