/* 
   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

#include "list.h"
// FORWARD DEFINITION

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:
  virtual ~Anim(void);

  void setInfinity(ANIM_INFINITY postInfinity = ANIM_INF_CONSTANT);

  void play(); // equals resume();
  void stop();
  void pause();
  void replay();
  virtual void rewind() = 0;

  virtual void tick(float time) = 0;

  /* implement in subclasses:
   * 
   * De-/Constructor
   * Animation Functions
   * virtual tick
   * List of keyFrames
   * currentKeyFrame/nextKeyFrame
   * virtual rewind, to go to the first Keyframe. (other functions will call this one)
   */
 protected:
  Anim(void);

  // variables

  float localTime;
  ANIM_INFINITY postInfinity;

  bool bHasKeys;
  bool bRunning;
};


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

  virtual void rewind();

  void setFuncToAnim(T* object, void (T::*funcToAnim)(float));
  void addKeyFrame(float value, float duration, ANIM_FUNCTION animFunc = ANIM_LINEAR);

  virtual void tick(float time);

  // animation functions
  void setAnimFunc(ANIM_FUNCTION animFunc);

  float random(float timePassed) const;
  float constant(float timePassed) const;
  float linear(float timePassed) const;
  float sine(float timePassed) const;
  //  ANIM_FUNCTION animFunc;
  float (tAnim<T>::*animFunc)(float) const;
  AnimKeyFrame* currentKeyFrame;
  AnimKeyFrame* nextKeyFrame;
  tList<AnimKeyFrame>* keyFrameList;





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



/**
   \brief standard constructor

*/
template<class T>
tAnim<T>::tAnim (T* object, void (T::*funcToAnim)(float)) 
{
  // create a new List
  this->keyFrameList = new tList<AnimKeyFrame>();
  AnimKeyFrame* tmpKeyFrame = new AnimKeyFrame;
  tmpKeyFrame->value = 0.0;
  tmpKeyFrame->duration = 1.0;
  keyFrameList->add(tmpKeyFrame);

  this->currentKeyFrame = tmpKeyFrame;
  this->nextKeyFrame = tmpKeyFrame;

  this->animFunc = &tAnim<T>::linear;

  this->setFuncToAnim(object, funcToAnim);
}


/**
   \brief standard deconstructor

*/
template<class T>
tAnim<T>::~tAnim () 
{
  // delete all the KeyFrames
  tIterator<AnimKeyFrame>* itKF = keyFrameList->getIterator();
  AnimKeyFrame*  enumKF = itKF->nextElement();
  while (enumKF)
    {
      delete enumKF;
      enumKF = itKF->nextElement();
    }
  delete itKF;
  delete this->keyFrameList;

}

template<class T>
void tAnim<T>::rewind(void)
{
  this->currentKeyFrame = keyFrameList->firstElement();
  this->nextKeyFrame = keyFrameList->nextElement(keyFrameList->firstElement());
  this->localTime = 0.0;
}

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

template<class T>
void tAnim<T>::addKeyFrame(float value, float duration, ANIM_FUNCTION animFunc)
{
  // some small check
  if (duration <= 0.0)
    duration = 1.0;
  

  AnimKeyFrame* tmpKeyFrame;
    
  if (bHasKeys)
    {
      tmpKeyFrame = new AnimKeyFrame;
      if (this->currentKeyFrame == this->nextKeyFrame)
	this->nextKeyFrame = tmpKeyFrame;
      this->keyFrameList->add(tmpKeyFrame);

    }
  else
    {
      tmpKeyFrame = this->keyFrameList->firstElement();
      bHasKeys = true;
    }
  tmpKeyFrame->value = value;
  tmpKeyFrame->duration = duration;
  tmpKeyFrame->animFunc = animFunc;
  
}


template<class T>
void tAnim<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));
    }
}


template<class T>
void tAnim<T>::setAnimFunc(ANIM_FUNCTION animFunc)
{
  switch (animFunc)
    {
    default:
    case ANIM_CONSTANT:
      this->animFunc = &tAnim<T>::constant;
      break;
    case ANIM_LINEAR:
      this->animFunc = &tAnim<T>::linear;
      break;
    case ANIM_RANDOM:
      this->animFunc = &tAnim<T>::random;
      break;
    case ANIM_SINE:
      this->animFunc = &tAnim<T>::sine;
      break;
    }
}


// animation functions
template<class T>
float tAnim<T>::random(float timePassed) const
{
  return (float)rand()/(float)RAND_MAX;
}

template<class T>
float tAnim<T>::constant(float timePassed) const
{
  return this->currentKeyFrame->value;
}

template<class T>
float tAnim<T>::linear(float timePassed) const 
{
  return this->nextKeyFrame->value - (this->nextKeyFrame->value - this->currentKeyFrame->value) 
    * (timePassed / this->currentKeyFrame->duration);
  //  PRINTF(0)("value is %f, %p %p\n", val, this->currentKeyFrame, this->nextKeyFrame);
  //  return val;
}

template<class T>
float tAnim<T>::sine(float timePassed) const
{
  
}

#endif /* _ANIMATION_H */