/*
** obs.c - <+DESC+>
**
** 2014 - Frank Villaro-Dixon <Frank@Villaro-Dixon.eu>
*/

#include <stdio.h>
#include <stdlib.h>
#include "game.h"
#include "col.h"
#include <math.h>

void
init_ob(struct s_obstacle *obs) { //{{{
	obs->used = 0;
} //}}}

void
init_obs(struct s_game *g) { //{{{
	int i;
	for(i = 0; i < g->num_obs; i++) {
		init_ob(&g->obs[i]);
	}
} //}}}

void
add_obstacle(struct s_game *g, struct s_obstacle o) { //{{{
	int i;
	for(i = 0; i < g->num_obs; i++) {
		if(!g->obs[i].used) {
			g->obs[i] = o;
			break;
		}
	}
} //}}}

struct s_obstacle
create_obstacle(int thick, int face, int speed) { //{{{
	struct s_obstacle o;

	o.used = 1;
	o.thick = thick;
	o.face = face;
	o.distance = sqrt(SCREEN_WIDTH*SCREEN_WIDTH + SCREEN_HEIGHT*SCREEN_HEIGHT)/2;
	o.speed = speed;

	return o;
} //}}}

void
delete_obstacle(struct s_game *g, int obs) { //{{{
	g->obs[obs].used = 0;
} //}}}

void
draw_obstacles(struct s_game *g,
               void(*drawer)(struct s_game *, int faceno, int dist, int thick, int col)) { //{{{
	int i;
	for(i = 0; i < g->num_obs; i++) {
		if(g->obs[i].used) {
			struct s_obstacle o = g->obs[i];
			drawer(g, o.face, o.distance, o.thick, g->color);
		}
	}
} //}}}

void
update_obstacles(struct s_game *g) { //{{{
	int i;
	for(i = 0; i < g->num_obs; i++) {
		if(g->obs[i].used) {
			g->obs[i].distance -= g->obs[i].speed;

			if(g->obs[i].distance <= POLYGON_SIZE)
				g->obs[i].used = 0;
		}
	}
} //}}}

void
add_random_obstacle(struct s_game *g) {
	struct s_obstacle o;

	o = create_obstacle(SHAPE_THICK, rand()%g->polygon_type, 1);
	add_obstacle(g, o);
}

int
check_collisions(struct s_game *g) {
	int i;
	for(i = 0; i < g->num_obs; i++) {
		if(g->obs[i].used) {
			if(has_collision(g, g->obs[i]))
				return 1;
		}
	}
	return 0;
}