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/* $Id$ */
/*
 * Copyright (c) 2010 Dimitri Sokolyuk <demon@dim13.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <curses.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>

struct	particle {
	int	x;
	int	y;
	int	dy;
	int	c;
	TAILQ_ENTRY(particle) link;
} *pp, *pnext;

TAILQ_HEAD(, particle) head;

extern	int LINES;
extern	int COLS;
static	int d_flag = 0;

char	flake[] = ".*#";

void
resize(int signo)
{
	struct	winsize ws;

	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
		resizeterm(ws.ws_row, ws.ws_col);
}

void
die(int signo)
{
	d_flag = 1;
}

int
main()
{
	initscr();
	curs_set(0);

	TAILQ_INIT(&head);
	srandom(time(NULL));

	signal(SIGWINCH, resize);
	signal(SIGINT, die);
	signal(SIGTERM, die);
	signal(SIGHUP, die);

	while (!d_flag) {
		erase();

		for (pp = TAILQ_FIRST(&head); pp; pp = pnext) {
			pnext = TAILQ_NEXT(pp, link);
			if (pp->y >= LINES || pp->x < 0 || pp->x >= COLS) {
				TAILQ_REMOVE(&head, pp, link);
				free(pp);
			} else {
				mvaddch(pp->y, pp->x, pp->c);
				pp->y += 1 + pp->dy;
				pp->x += 1 - random() % 3;
			}
		}

		pp = calloc(1, sizeof(struct particle));
		pp->dy = random() % 3;
		pp->y = 0;
		pp->x = random() % COLS;
		pp->c = flake[random() % (nitems(flake) - 1)];
		TAILQ_INSERT_HEAD(&head, pp, link);

		refresh();
		usleep(50000);
	}

	curs_set(1);
	endwin();

	return 0;
}