/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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_SEQUENCE
#define OSG_SEQUENCE 1

#include <osg/Switch>

namespace osg {

/** Sequence is a Group node which allows automatic, time based
    switching between children.
*/
class SG_EXPORT Sequence : public Group
{
public :
        
    Sequence();

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

    META_Node(osg, Sequence);

    virtual void traverse(NodeVisitor& nv);
    
    
    void setValue(int value) { _value = value; }
    int getValue() const { return _value; }

    /** Set time in seconds for child. */
    void setTime(int frame, float t);

    /** Get time for child. */
    float getTime(int frame) const;

    /** Interval modes. 'Loop' repeats frames 1-N; 'swing' repeats 1->N, (N-1)->1. */
    enum LoopMode
    {
        LOOP,
        SWING
    };

    /** Set sequence mode & interval (range of children to be displayed). */
    void setInterval(LoopMode mode, int begin, int end);

    /** Get sequence mode & interval. */
    inline void getInterval(LoopMode& mode, int& begin, int& end) const
    {
        mode = _loopMode;
        begin = _begin;
        end = _end;
    }

    /** Set duration: speed-up & number of repeats */
    void setDuration(float speed, int nreps = -1);

    /** Get duration & number of repeats. */
    inline void getDuration(float& speed, int& nreps) const
    {
        speed = _speed;
        nreps = _nreps;
    }

    /** Sequence modes. */
    enum SequenceMode
    {
        START,
        STOP,
        PAUSE,
        RESUME
    };

    /** Set sequence mode. Start/stop & pause/resume. */
    void setMode(SequenceMode mode);

    /** Get sequence mode. */
    inline SequenceMode getMode() const { return _mode; }

protected :
    
    virtual ~Sequence() {}

    int        _value;

    float _last;
    std::vector<float> _frameTime;

    int _step;

    LoopMode _loopMode;
    int _begin, _end;

    float _speed;
    int _nreps, _nrepsremain;

    SequenceMode _mode;
};

}

#endif