/*!
 * @file collision_event.h
 *  Definition of a collision event
 *
 *  A collision event represents a collision of two bouning boxes. Every CollisionEvent belongs to a Collision object that
 *  represents the collision of two WorldEntities.
 *
 *  There are different types of collisions: obb collisions and bsp collisions. Both collision types use different techniques
 *  to represent collisions. This is why this class saves bounding boxes from the OBB as well as the planes from BSP.
 */

#ifndef _COLLISION_EVENT_H
#define _COLLISION_EVENT_H

#include "vector.h"
#include "cr_engine.h"

#include "cr_defs.h"


class WorldEntity;
class BoundingVolume;
class Plane;

namespace CoRe
{

  //! A class representing a simple collision
  class CollisionEvent
  {
  public:
    CollisionEvent();
    virtual ~CollisionEvent();

    /** collides two WorldEntities @param entityA world entity A, @param entityB world entity B, @param bvA volume A @param bvB volumeB */
    inline void collide(CREngine::CollisionType type, WorldEntity* entityA, WorldEntity* entityB, BoundingVolume* bvA, BoundingVolume* bvB)
    { this->collisionType = type; this->entityA = entityA; this->entityB = entityB; this->bvA = bvA; this->bvB = bvB; }
    /** collides two WorldEntities @param entity world entity , @param ground ground plane, @param position position on the ground */
    inline void collide(CREngine::CollisionType type, WorldEntity* entity, WorldEntity* groundEntity, Vector normal, Vector position, bool bInWall)
    {
      this->collisionType = type;
      this->entityA = entity;
      this->entityB = groundEntity;
      this->groundNormal = normal;
      this->position = position;
      this->bInWall = bInWall;
    }


    /** @return CollisionEvent WorldEntity A */
    inline const WorldEntity* getEntityA() const  { return this->entityA; }
    /** @return CollisionEvent WorldEntity B */
    inline const WorldEntity* getEntityB() const  { return this->entityB; }
    /** @return Bounding Volume from EntityA */
    inline const BoundingVolume* getBVA() const { return this->bvA; }
    /** @return Bounding Volume from EntityB */
    inline const BoundingVolume* getBVB() const {  return this->bvB;  }

    /** @return ground plane if collided with bsp model */
    inline const Vector& getGroundNormal() const  { return this->groundNormal; }

    /** @return position of the position, only accurate if this is a collision with the ground!!! */
    inline const Vector& getCollisionPosition() const  {  return this->position;  }

    /** @return the type of the collision */
    inline int getType() const  {  return this->collisionType;  }

    /** @return true if the entity is in the wall */
    inline bool isInWall() const  {  return this->bInWall;  }


  private:
    WorldEntity*      entityA;                       //!< the collision body A
    WorldEntity*      entityB;                       //!< the collision body B

    BoundingVolume*   bvA;                           //!< reference to the bounding volume A
    BoundingVolume*   bvB;                           //!< reference to the bounding volume B

    Vector            groundNormal;                  //!< the ground plane with which it collides (only for bsp-model collisions
    Vector            position;                      //!< position of the collision on the ground plane

    bool              bInWall;                       //!< true if is in wall
    int               collisionType;                 //!< collision type
  };

}
#endif /* _COLLISION_EVENT_H */