/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2007 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_STATS
#define OSG_STATS 1

#include <osg/Referenced>

#include <string>
#include <map>
#include <vector>
#include <ostream>

namespace osg {

class OSG_EXPORT Stats : public osg::Referenced
{
    public:

        Stats(const std::string& name, unsigned int numberOfFrames=100);
        
        void setName(const std::string& name) { _name = name; }
        const std::string& getName() const { return _name; }
        
        void allocate(unsigned int numberOfFrames);
        
        int getEarliestFrameNumber() const { return _latestFrameNumber < static_cast<int>(_attributeMapList.size()) ? 0 : _latestFrameNumber - _attributeMapList.size() + 1; }
        int getLatestFrameNumber() const { return _latestFrameNumber; }
        
        typedef std::map<std::string, double> AttributeMap;
        typedef std::vector<AttributeMap> AttributeMapList;

        bool setAttribute(int frameNumber, const std::string& attributeName, double value);
        bool getAttribute(int frameNumber, const std::string& attributeName, double& value) const;        
        
        AttributeMap& getAttributeMap(int frameNumber);
        const AttributeMap& getAttributeMap(int frameNumber) const;
        
        void report(std::ostream& out);
        
    protected:
    
        virtual ~Stats() {}
        
        int getIndex(int frameNumber) const
        {
            // reject frame that are in the future
            if (frameNumber > _latestFrameNumber) return -1;
            
            // reject frames that are too early
            if (frameNumber < getEarliestFrameNumber()) return -1;
            
            if (frameNumber >= _baseFrameNumber) return frameNumber - _baseFrameNumber;
            else return _attributeMapList.size() - (_baseFrameNumber-frameNumber);
        }

        std::string         _name;
        
        int                 _baseFrameNumber;
        int                 _latestFrameNumber;
        
        AttributeMapList    _attributeMapList;
        AttributeMap        _invalidAttributeMap;
        
};


}

#endif