/*
 * Copyright (C) 2021  P. J. McDermott
 *
 * This file is part of Dodge Balls
 *
 * Dodge Balls is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Dodge Balls is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Dodge Balls.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include "ball.h"
#include "collision.h"
#include "output.h"

struct db_ball {
	int             x;
	int             y;
	int             r;
	int             a;
	int             s;
	struct db_ball *next;
};

struct db_ball *
db_ball_new(int x, int y, int r, int a, int s, struct db_ball *prev)
{
	struct db_ball *ball;

	ball = calloc(1, sizeof(*ball));
	if (ball == NULL) {
		db_err("Failed to allocate memory");
		return NULL;
	}

	ball->x = x;
	ball->y = y;
	ball->r = r;
	ball->a = a;
	ball->s = s;

	if (prev != NULL) {
		prev->next = ball;
	}

	return ball;
}

static void
_db_ball_collisions(struct db_ball *this)
{
	struct db_ball *that;
	int             col_x;
	int             col_y;

	for (that = this->next; that != NULL; that = that->next) {
		if (db_col_pt_cir_cir(this->x, this->y, this->r,
					that->x, that->y, that->r,
					&col_x, &col_y)) {
			/* TODO: Reverse direction */
		}
	}
}

void
db_balls_collisions(struct db_ball *ball_head)
{
	struct db_ball *ball;

	for (ball = ball_head; ball != NULL; ball = ball->next) {
		_db_ball_collisions(ball);
	}
}

int
db_balls_player_collisions(struct db_ball *ball_head,
		int player_x, int player_y, int player_r)
{
	struct db_ball *ball;

	for (ball = ball_head; ball != NULL; ball = ball->next) {
		if (db_col_cir_cir(ball->x, ball->y, ball->r,
					player_x, player_y, player_r)) {
			return 1;
		}
	}
	return 0;
}