#ifndef __COLLISION_H_INCLUDED__
#define __COLLISION_H_INCLUDED__

#include "mesh.h"

class ObjectLink;

#define COLLISIONGROUP_NONE      0
#define COLLISIONGROUP_ARENA     1
#define COLLISIONGROUP_MAN1      2
#define COLLISIONGROUP_MAN1HAND  3
#define COLLISIONGROUP_MAN2      4
#define COLLISIONGROUP_MAN2HAND  5
#define COLLISIONGROUP_PARTICLE  6

#define COLLISIONFRICTION 0.9

void initCollisions(void);
//void addCollisionObject(Object *object, int group);
void addCollisionLink(int source, int target);
void removeCollisionLink(int source, int target);
bool isCollisionLink(int source, int target);

class Contact{
public:
    Object *object1, *object2;
    float normal[3];
    float position[3];
};

extern Contact *contacts;
extern int contactcount;


//Contact point is world-relative and must be transformed
//into coordinate system of both objects
void addCollision(Object *source, Object *target,
                                    float *normal, float *contactpoint);
bool handleCollision(Contact *contact);
bool handleLink(ObjectLink *link);

bool checkSphereMeshCollision(float *sphereposition, float r, Mesh *mesh, float *normal, float *contactpoint);
bool checkPointMeshCollision(float *position, Mesh *mesh, float *normal, float *contactpoint);
bool checkEdgeMeshCollision(float *p1, float *p2, Mesh *mesh, float *normal, float *contactpoint);

#endif