/*  -*-c++-*-
 *  Copyright (C) 2008 Cedric Pinson <cedric.pinson@plopbyte.net>
 *
 * 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 OSGANIMATION_ANIMATION
#define OSGANIMATION_ANIMATION 1

#include <osg/Object>
#include <osgAnimation/Export>
#include <osgAnimation/Channel>
#include <osg/ref_ptr>
#include <vector>
#include <map>

namespace osgAnimation
{

    class OSGANIMATION_EXPORT Animation : public osg::Object
    {
    public:
        META_Object(osgAnimation, Animation)

        Animation() :
            _duration(0.0), _originalDuration(0.0),
            _weight(0), _startTime(0), _playmode(LOOP) {}

        Animation(const osgAnimation::Animation&, const osg::CopyOp&);

        enum PlayMode
        {
            ONCE,
            STAY,
            LOOP,
            PPONG
        };

        // addChannel insert the channel and call the computeDuration function
        void addChannel (Channel* pChannel);

        // removeChannel remove the channel from channels list and call the computeDuration function
        void removeChannel (Channel* pChannel);

        /** Those accessors let you add and remove channels
         *  if you modify something that can change the duration
         *  you are supposed to call computeDuration or setDuration
         */
        ChannelList& getChannels();
        const ChannelList& getChannels() const;

        /** Change the duration of animation
         *  then evaluate the animation in the range 0-duration
         *  it stretch the animation in time.
         *  see computeDuration too
         */
        void setDuration(double duration);

        /** Compute duration from channel and keyframes
         *  if the duration is not specified you should
         *  call this method before using it
         */
        void computeDuration();
        double getDuration() const;

        void setWeight (float weight);
        float getWeight() const;

        bool update (double time, int priority = 0);
        void resetTargets();

        void setPlayMode (PlayMode mode) { _playmode = mode; }
        PlayMode getPlayMode() const { return _playmode; }

        void setStartTime(double time)  { _startTime = time;}
        double getStartTime() const { return _startTime;}

    protected:

        ~Animation() {}

        double computeDurationFromChannels() const;

        double _duration;
        double _originalDuration;
        float _weight;
        double _startTime;
        PlayMode _playmode;
        ChannelList _channels;

    };

    typedef std::vector<osg::ref_ptr<osgAnimation::Animation> > AnimationList;
    typedef std::map<std::string, osg::ref_ptr<osgAnimation::Animation> > AnimationMap;


}

#endif