/* 
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/


/*! 
    \file animation.h
    A Set of functions to animate some floats inside of an Object

    We apologize, that most part of the Function-Definitions are located 
    inside this h-file, but this must be like this because it is a template
    function.
*/

#ifndef _ANIMATION_H
#define _ANIMATION_H


// FORWARD DEFINITION
template<class T> class tList;

typedef enum ANIM_FUNCTION {ANIM_CONSTANT,
			    ANIM_LINEAR,
			    ANIM_SINE,
			    ANIM_RANDOM};

typedef enum ANIM_INFINITY {ANIM_INF_CONSTANT,
			    ANIM_INF_LINEAR,
			    ANIM_INF_PINGPONG,
			    ANIM_INF_REWIND};//, ANIM_DELETE}

struct AnimKeyFrame
{
  float duration;
  float value;
  ANIM_FUNCTION animFunc;
};

class Anim
{
 public:
  void addKeyFrame(float value, float duration, ANIM_FUNCTION animFunc = ANIM_LINEAR);
  void setInfinity(ANIM_INFINITY preInfinity = ANIM_INF_CONSTANT,
		   ANIM_INFINITY postInfinity = ANIM_INF_CONSTANT);
  void setAnimFunc(ANIM_FUNCTION animFunc);

 protected:
  Anim(void);
  virtual ~Anim(void);

  static tList<Anim>* animatorList;

  virtual void tick(float time) = 0;



  // animation functions
  float random(float timePassed) const;
  float constant(float timePassed) const;
  float linear(float timePassed) const;
  float sine(float timePassed) const;


  // variables
  //  ANIM_FUNCTION animFunc;
  float (Anim::*animFunc)(float) const;
  ANIM_INFINITY preInfinity;
  ANIM_INFINITY postInfinity;

  bool bHasKeys;
  bool bRunning;

  float localTime;
  AnimKeyFrame* currentKeyFrame;
  AnimKeyFrame* nextKeyFrame;
  tList<AnimKeyFrame>* keyFrameList;
};


//! A Class to handle some animation for single floated values.
template<class T> class Animation : public Anim
{
 public:
  Animation(T* object = NULL, void (T::*funcToAnim)(float) = NULL);
  virtual ~Animation();

  void setFuncToAnim(T* object, void (T::*funcToAnim)(float));

  virtual void tick(float time);

 private:
  T* object;
  void (T::*funcToAnim)(float);
};



/**
   \brief standard constructor

*/
template<class T>
Animation<T>::Animation (T* object, void (T::*funcToAnim)(float)) 
{
  this->setFuncToAnim(object, funcToAnim);
}


/**
   \brief standard deconstructor

*/
template<class T>
Animation<T>::~Animation () 
{
  // delete what has to be deleted here
}


template<class T>
void Animation<T>::setFuncToAnim(T* object, void (T::*funcToAnim)(float))
{
  this->object = object;
  this->funcToAnim = funcToAnim;
}


template<class T>
void Animation<T>::tick(float time)
{
  if (this->bRunning)
    {
      this->localTime += time;
      if (localTime >= this->currentKeyFrame->duration)
	{
	  this->localTime = 0;
	  if (this->currentKeyFrame == this->keyFrameList->lastElement())
	    switch (this->postInfinity)
	      {
	      case ANIM_INF_CONSTANT:
		this->bRunning = false;
		break;
	      case ANIM_INF_REWIND:
		break;
	      }
	  this->currentKeyFrame = this->keyFrameList->nextElement(this->currentKeyFrame);
	  this->nextKeyFrame = this->keyFrameList->nextElement(this->nextKeyFrame);
	  printf("%p from:%f to:%f\n", this->currentKeyFrame,this->currentKeyFrame->value, this->nextKeyFrame->value);
	  
	  
	}
      
      (this->object->*(funcToAnim))((this->*animFunc)(this->localTime));
    }
}

#endif /* _ANIMATION_H */