/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGWIDGET_PDFREADER
#define OSGWIDGET_PDFREADER

#include <osg/Image>
#include <osg/Geode>

#include <osgWidget/Export>

namespace osgWidget {


/** Hints structure that can be passed to PdfReader and VncClient classes to help guide them on what geometry to build.*/
struct GeometryHints
{
    enum AspectRatioPolicy
    {
        RESIZE_HEIGHT_TO_MAINTAINCE_ASPECT_RATIO,
        RESIZE_WIDTH_TO_MAINTAINCE_ASPECT_RATIO,
        IGNORE_DOCUMENT_ASPECT_RATIO,
    };

    GeometryHints():
        position(0.0f,0.0f,0.0f),
        widthVec(1.0f,0.0f,0.0f),
        heightVec(0.0f,1.0f,0.0f),
        aspectRatioPolicy(RESIZE_HEIGHT_TO_MAINTAINCE_ASPECT_RATIO) {}

    GeometryHints(const osg::Vec3& pos,
                  const osg::Vec3& wVec,
                  const osg::Vec3& hVec, 
                  AspectRatioPolicy asp=RESIZE_HEIGHT_TO_MAINTAINCE_ASPECT_RATIO):
        position(pos),
        widthVec(wVec),
        heightVec(hVec),
        aspectRatioPolicy(asp) {}

    osg::Vec3 position;
    osg::Vec3 widthVec;
    osg::Vec3 heightVec;
    AspectRatioPolicy aspectRatioPolicy;

};

/** Pure virtual base class for interfacing with implementation of PDF reader.*/
class PdfImage : public osg::Image
{
    public:
    
        PdfImage():_pageNum(0) {}
    
        int getPageNum() const { return _pageNum; }
    
	virtual int getNumOfPages() = 0;
        
        virtual bool page(int pageNum) = 0;

        bool previous()
        {
            return page(_pageNum-1);
        }
        
        bool next()
        { 
             return page(_pageNum+1);
        }
        

    protected:
    
        virtual ~PdfImage() {}
        
        int _pageNum;
    
};


/** Convinience class that provides a interactive quad that can be placed directly in the scene.*/
class OSGWIDGET_EXPORT PdfReader : public osg::Geode
{
    public:
    
        PdfReader() {}

        PdfReader(const std::string& filename, GeometryHints hints = GeometryHints());
        
        bool assign(PdfImage* pdfImage, GeometryHints hints = GeometryHints());

        bool open(const std::string& filename, GeometryHints hints = GeometryHints());

        bool page(int pageNum);

        bool previous();
        
        bool next();

    protected:
    
        osg::ref_ptr<PdfImage> _pdfImage;
};

}

#endif