#ifndef _PLANET_H
#define _PLANET_H

#include <SDL.h>

#include "vector.h"
#include "list.h"
#include "utils.h"
#include "camera.h"
#include "quadtree.h"

struct planet {
	struct vector speed;
	struct list_head list;
	struct quadtree tree;
	double mass;
	float radius;
	unsigned char r, g, b;

	/* info about the planets in sub branches */
	float tree_area;	/* total area occupied by the tree */
	double tree_mass;	/* total mass occupied by the tree */
};

struct planet_search_iterator {
	struct quadtree_iterator qt_iterator;
	struct vector limit[2];
	struct camera *cam;
	SDL_Surface *screen;
};

#define list_to_planet(list_head) container_of((list_head), struct planet, list)

#define tree_to_planet(qt) container_of((qt), struct planet, tree)

#define qt_itr_to_planet_itr(qt)					\
	container_of((qt), struct planet_search_iterator, qt_iterator)

void init_planet(struct planet *p);
void create_planets(struct planet *p, int num, double total_mass,
		    double radius);
void draw_planet(SDL_Surface *screen, struct planet *p, const struct camera *);
int gravitize_planets(struct planet *a, struct planet *b, const double time);
struct planet *merge_planets(struct planet *a, struct planet *b);
struct planet *move_planet(struct planet *p, const double time);
void print_planet(const struct planet *p);

int planet_spatial_compare(struct quadtree *a, struct quadtree *b);
int planet_search_rectangular(struct quadtree *node,
			      struct quadtree_iterator *itr);
void planet_draw_iterator(struct quadtree *node, struct quadtree_iterator *it);

#endif