/*! 
    \file particle_engine.h
    \brief Definition of the ParticleEngine
*/

#ifndef _PARTICLE_ENGINE_H
#define _PARTICLE_ENGINE_H

#include "base_object.h"
#include "particle_system.h"
#include "particle_emitter.h"

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

struct ParticleConnection
{
  ParticleEmitter* emitter;    //!< The emitter to emit system from.
  ParticleSystem* system;      //!< The Particles emitted from emitter.
};

//! A default singleton class.
class ParticleEngine : public BaseObject {

 public:
  static ParticleEngine* getInstance(void);
  virtual ~ParticleEngine(void);

  void tick(float dt);
  void draw(float dt);

  void addSystem(ParticleSystem* system);
  void addEmitter(ParticleEmitter* emitter);
  void addConnection(ParticleEmitter* emitter, ParticleSystem* system);

  bool removeSystem(ParticleSystem* system);
  bool removeEmitter(ParticleEmitter* emitter);
  bool breakConnection(ParticleEmitter* emitter, ParticleSystem* system);
  bool breakConnection(ParticleConnection* connection);

  void debug();

 private:
  ParticleEngine(void);
  static ParticleEngine* singletonRef;

  tList<ParticleSystem>* systemList;
  tList<ParticleEmitter>* emitterList;

  tList<ParticleConnection>* connectionList;
};

#endif /* _PARTICLE_ENGINE_H */