/*! 
    \file simple_animation.h
    \brief A class to interpolate the movement of an object following descrete points in room and time
    \todo implement it

    This class has been done to animate some movement, works best for short 
    distances.
*/

#ifndef _SIMPLE_ANIMATION_H
#define _SIMPLE_ANIMATION_H

#include "base_object.h"
#include "list.h"
#include "animation.h"


class Vector;
class Quaternion;
class PNode;

typedef enum movementMode{LINEAR=0, EXP, NEG_EXP, SIN, COS, QUADRATIC};
typedef enum animationMode{SINGLE=0, LOOP};
#define DEFAULT_ANIMATION_MODE LINEAR


//! KeyFrame Struct
/**
   This represents one point with direction of the animation
*/
typedef struct KeyFrame3D {
  Vector* position;
  Quaternion* direction;
  PNode* object;
  float time;
  movementMode mode;
};

//! Animation Struct
/**
   This represents an animation for a object
*/
class Animation3D : public Animation
{
 public:
  Animation3D(void);
  virtual ~Animation3D(void);
    
  virtual void rewind(void);

  void addKeyFrame(Vector* point, Quaternion* direction, float time, ANIM_FUNCTION animFunc = ANIM_LINEAR);
  void addKeyFrame(KeyFrame3D* frame);

  virtual void tick(float timePassed);

  // animation functions
  void setAnimFunc(ANIM_FUNCTION animFunc);

 private:
  float constant(float timePassed) const;
  float linear(float timePassed) const;
  float sine(float timePassed) const;
  float cosine(float timePassed) const;
  float exp(float timePassed) const;
  float negExp(float timePassed) const;
  float quadratic(float timePassed) const;
  float random(float timePassed) const;
  //  ANIM_FUNCTION animFunc;
  KeyFrame3D* currentKeyFrame;
  KeyFrame3D* nextKeyFrame;
  tList<KeyFrame3D>* keyFrameList;
  float (Animation3D::*animFunc)(float) const;

  // private
  PNode* object;
  Vector* lastPosition;
  Vector* tmpVect;
  float deltaT;
  float localTime;

  tList<KeyFrame3D>* frames;
  KeyFrame3D* currentFrame;
  KeyFrame3D* lastFrame;

  bool bRunning;

  animationMode animMode;
  movementMode movMode;
};

//! Animation Class
/**
   Helps you making some small animation
*/
class SimpleAnimation : public BaseObject {
 public:
  static SimpleAnimation* getInstance();
  virtual ~SimpleAnimation();

  void animatorBegin();
  void animatorEnd();
  void selectObject(PNode* entity);
  void addKeyFrame(Vector* point, Quaternion* direction, float time);
  void addKeyFrame(Vector* point, Quaternion* direction, float time, movementMode mode);
  void addKeyFrame(KeyFrame3D* frame);
  void setAnimationMode(animationMode mode);
  void reset();


  void start();
  void stop();
  void restart();
  void pause();
  void resume();

  void tick(float time);

 private:
  SimpleAnimation();

  static SimpleAnimation* singletonRef;
  bool bDescriptive;               //<! is true, when AnimatorBegin() was executed but no AnimatorEnd() yet: in describtive mode: pass commands
  bool bRunning;                   //<! is set, when the animation is running
  tList<KeyFrame3D>* frames;         //<! where keyframes are stored in
  tList<Animation3D>* animators;      //<! a list of animation's
  KeyFrame3D* currentFrame;          //<! the frame that is been played now
  KeyFrame3D* lastFrame;
  Vector* lastPosition;
  movementMode mode;               //<! this is an enum of the mode, how the speed is distributed
  float localTime;
  PNode* parent;
  
  Vector* tmpVect;                 //<! this is the temporary vector save place - 
  PNode* workingObject;      //<! this is a pointer to the current working object that has been selected via selectObject()
  Animation3D* workingAnimator;       //<! the animator with which you are currently working
  float deltaT;                    //<! this is a time constant for the movement

  Animation3D* getAnimationFromPNode(PNode* entity);

};

#endif /* _SIMPLE_ANIMATION_H */