#ifndef TWODPHYSICS_H
#define TWODPHYSICS_H

#include "script.h"
#include <chipmunk/chipmunk.h>
#include "render.h"

struct gameobject;

extern float phys2d_gravity;
extern int physOn;
extern cpSpace *space;


extern struct rgba color_white;
extern struct rgba color_black;

extern struct rgba disabled_color;
extern struct rgba dynamic_color;
extern struct rgba kinematic_color;
extern struct rgba static_color;
extern struct rgba sleep_color;

struct phys2d_shape {
  cpShape *shape;
  int go;
  void *data; /* The specific subtype; phys2d_circle, etc */
  void (*debugdraw)(void *data);
  float (*moi)(void *data, float mass);
  void (*apply)(void *data);
};

/* Circles are the fastest collier type */
struct phys2d_circle {
  float radius;
  HMM_Vec2 offset;
  struct phys2d_shape shape;
};

/* A single segment */
struct phys2d_segment {
  HMM_Vec2 a;
  HMM_Vec2 b;
  float thickness;
  struct phys2d_shape shape;
};

/* A convex polygon; defined as the convex hull around the given set of points */
struct phys2d_poly {
  HMM_Vec2 *points;
  float radius;
  struct phys2d_shape shape;
};

/* A box shape; a type of a polygon collider */
struct phys2d_box {
  float w;
  float h;
  HMM_Vec2 offset;
  float rotation;
  float r; /* radius */
  struct phys2d_shape shape;
};

/* An edge with no volume. Cannot collide with each other. Join to make levels. Static only. */
struct phys2d_edge {
  HMM_Vec2 *points; /* Points defined relative to the gameobject */
  float thickness;
  cpShape **shapes;
  int closed; /* True if the first and last points should be connected */
  struct phys2d_shape shape;
  int draws;
};

struct phys2d_circle *Make2DCircle(int go);
void phys2d_circledel(struct phys2d_circle *c);
void phys2d_applycircle(struct phys2d_circle *circle);
void phys2d_dbgdrawcircle(struct phys2d_circle *circle);
float phys2d_circle_moi(struct phys2d_circle *c, float m);

struct phys2d_box *Make2DBox(int go);
void phys2d_boxdel(struct phys2d_box *box);
void phys2d_applybox(struct phys2d_box *box);
void phys2d_dbgdrawbox(struct phys2d_box *box);
float phys2d_box_moi(struct phys2d_box *box, float m);

struct phys2d_poly *Make2DPoly(int go);
void phys2d_polydel(struct phys2d_poly *poly);
void phys2d_applypoly(struct phys2d_poly *poly);
void phys2d_dbgdrawpoly(struct phys2d_poly *poly);
void phys2d_polyaddvert(struct phys2d_poly *poly);
void phys2d_poly_setverts(struct phys2d_poly *poly, cpVect *verts);
float phys2d_poly_moi(struct phys2d_poly *poly, float m);

struct phys2d_edge *Make2DEdge(int go);
void phys2d_edgedel(struct phys2d_edge *edge);
void phys2d_applyedge(struct phys2d_edge *edge);
void phys2d_dbgdrawedge(struct phys2d_edge *edge);
void phys2d_edgeaddvert(struct phys2d_edge *edge);
void phys2d_edge_rmvert(struct phys2d_edge *edge, int index);
float phys2d_edge_moi(struct phys2d_edge *edge, float m);

void phys2d_edge_setvert(struct phys2d_edge *edge, int index, cpVect val);
void phys2d_edge_clearverts(struct phys2d_edge *edge);
void phys2d_edge_addverts(struct phys2d_edge *edge, cpVect *verts);
void phys2d_edge_set_sensor(struct phys2d_edge *edge, int sensor);
void phys2d_edge_set_enabled(struct phys2d_edge *edge, int enabled);

void phys2d_init();
void phys2d_update(float deltaT);
cpShape *phys2d_query_pos(cpVect pos);
int *phys2d_query_box(HMM_Vec2 pos, HMM_Vec2 wh);

struct phys_cbs {
  struct callee begin;
  struct callee separate;
};

struct shape_cb {
  struct phys2d_shape *shape;
  struct phys_cbs cbs;
};

void fire_hits();

void phys2d_rm_go_handlers(int go);
void phys2d_set_gravity(cpVect v);

void shape_enabled(struct phys2d_shape *shape, int enabled);
int shape_is_enabled(struct phys2d_shape *shape);
void shape_set_sensor(struct phys2d_shape *shape, int sensor);
int shape_get_sensor(struct phys2d_shape *shape); 

struct rgba shape_color_s(cpShape *shape);

void shape_gui(struct phys2d_shape *shape);
void phys2d_setup_handlers(int go);
int *phys2d_query_shape(struct phys2d_shape *shape);
int *phys2d_query_box_points(HMM_Vec2 pos, HMM_Vec2 wh, HMM_Vec2 *points, int n);

void flush_collide_cbs();

void phys2d_reindex_body(cpBody *body);
extern unsigned int category_masks[32];
void set_cat_mask(int cat, unsigned int mask);
int phys2d_in_air(cpBody *body);
#endif