/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 OSG_IMAGESEQUENCE
#define OSG_IMAGESEQUENCE 1

#include <OpenThreads/Mutex>
#include <osg/ImageStream>
#include <osg/StateAttribute>

#include <list>

namespace osg {

/**
  * Image Buffer class.
*/
class OSG_EXPORT ImageSequence : public ImageStream
{
    public:
        ImageSequence();

        /** Copy constructor using CopyOp to manage deep vs shallow copy. */
        ImageSequence(const ImageSequence& ImageSequence, const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        virtual Object* cloneType() const { return new ImageSequence(); }
        virtual Object* clone(const CopyOp& copyop) const { return new ImageSequence(*this,copyop); }
        virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const ImageSequence*>(obj)!=0; }
        virtual const char* libraryName() const { return "osg"; }
        virtual const char* className() const { return "ImageSequence"; }

        /** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */
        virtual int compare(const Image& rhs) const;

        virtual void setReferenceTime(double t) { _referenceTime = t; }
        virtual double getReferenceTime() const { return _referenceTime; }
                
        virtual void setTimeMultiplier(double tm) { _timeMultiplier = tm; }
        virtual double getTimeMultiplier() const { return _timeMultiplier; }

        typedef std::list< osg::ref_ptr<osg::Image> >   Images;
        typedef std::list< std::string >                FileNames;
        
        enum Mode
        {
            PRE_LOAD_ALL_IMAGES,
            PAGE_AND_RETAIN_IMAGES,
            PAGE_AND_DISCARD_USED_IMAGES
        };
        
        void setMode(Mode mode);
        Mode getMode() const { return _mode; }

        void setDuration(double duration);
        double getDuration() const { return _duration; }

        void addImageFile(const std::string& fileName);
        
        FileNames& getFileNames() { return _fileNames; }
        const FileNames& getFileNames() const { return _fileNames; }

        void addImage(osg::Image* image);
        
        Images& getImages() { return _images; }
        const Images& getImages() const { return _images; }
        

        virtual void update(NodeVisitor* nv);

        struct OSG_EXPORT UpdateCallback : public osg::StateAttribute::Callback
        {
            virtual void operator () (osg::StateAttribute* attr, osg::NodeVisitor* nv);
        };

    protected:

        virtual ~ImageSequence() {}
        
        void setImageToChild(const osg::Image* image);
        
        void computeTimePerImage();

        double                          _referenceTime;
        double                          _timeMultiplier;

        Mode                            _mode;
        double                          _duration;

        double                          _timePerImage;

        OpenThreads::Mutex              _mutex;
        FileNames                       _fileNames;
        FileNames::iterator             _fileNamesIterator;
        double                          _fileNamesIteratorTime;

        double                          _imageHeadTime;
        Images                          _images;
        Images::iterator                _imageIterator;
        double                          _imageIteratorTime;
        
        typedef std::pair< std::string, osg::ref_ptr<osg::Image> >  FileNameImagePair;
        typedef std::list< FileNameImagePair >  FileNameImageList;
        
        FileNameImageList               _filesRequested;

};

} // namespace

#endif
