/*	$NetBSD: fly.c,v 1.16 2021/05/02 12:50:43 rillig Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)fly.c	8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: fly.c,v 1.16 2021/05/02 12:50:43 rillig Exp $");
#endif
#endif				/* not lint */

#include "extern.h"
#undef UP
#include <curses.h>
#include <assert.h>

#define MIDR  (LINES/2 - 1)
#define MIDC  (COLS/2 - 1)

static int     row, column;
static int     dr = 0, dc = 0;
static char    destroyed;
int     ourclock = 120;		/* time for all the flights in the game */
static char    cross = 0;
static sig_t   oldsig;

static void blast(void);
static void endfly(void);
static void moveenemy(int);
static void notarget(void);
static void screen(void);
static void succumb(int);
static void target(void);

static void
succumb(int dummy __unused)
{
	if (oldsig == SIG_DFL) {
		endfly();
		exit(1);
	}
	if (oldsig != SIG_IGN) {
		endfly();
		(*oldsig) (SIGINT);
	}
}

int
visual(void)
{
	destroyed = 0;
	if (initscr() == NULL) {
		puts("Whoops!  No more memory...");
		return (0);
	}
	oldsig = signal(SIGINT, succumb);
	cbreak();
	noecho();
	screen();
	row = rnd(LINES - 3) + 1;
	column = rnd(COLS - 2) + 1;
	moveenemy(0);
	for (;;) {
		switch (getchar()) {

		case 'h':
		case 'r':
			dc = -1;
			fuel--;
			break;

		case 'H':
		case 'R':
			dc = -5;
			fuel -= 10;
			break;

		case 'l':
			dc = 1;
			fuel--;
			break;

		case 'L':
			dc = 5;
			fuel -= 10;
			break;

		case 'j':
		case 'u':
			dr = 1;
			fuel--;
			break;

		case 'J':
		case 'U':
			dr = 5;
			fuel -= 10;
			break;

		case 'k':
		case 'd':
			dr = -1;
			fuel--;
			break;

		case 'K':
		case 'D':
			dr = -5;
			fuel -= 10;
			break;

		case '+':
			if (cross) {
				cross = 0;
				notarget();
			} else
				cross = 1;
			break;

		case ' ':
		case 'f':
			if (torps) {
				torps -= 2;
				blast();
				if (row == MIDR && column < MIDC + 2 &&
				    column > MIDC - 2) {
					destroyed = 1;
					alarm(0);
				}
			} else
				mvaddstr(0, 0, "*** Out of torpedoes. ***");
			break;

		case 'q':
			endfly();
			return (0);

		default:
			mvaddstr(0, 26, "Commands = r,R,l,L,u,U,d,D,f,+,q");
			continue;

		case EOF:
			break;
		}
		if (destroyed) {
			endfly();
			return (1);
		}
		if (ourclock <= 0) {
			endfly();
			die();
		}
	}
}

static void
screen(void)
{
	int     r, c, n;
	int     i;

	clear();
	i = rnd(100);
	for (n = 0; n < i; n++) {
		r = rnd(LINES - 3) + 1;
		c = rnd(COLS);
		mvaddch(r, c, '.');
	}
	mvaddstr(LINES - 1 - 1, 21, "TORPEDOES           FUEL           TIME");
	refresh();
}

static void
target(void)
{
	int     n;

	move(MIDR, MIDC - 10);
	addstr("-------   +   -------");
	for (n = MIDR - 4; n < MIDR - 1; n++) {
		mvaddch(n, MIDC, '|');
		mvaddch(n + 6, MIDC, '|');
	}
}

static void
notarget(void)
{
	int     n;

	move(MIDR, MIDC - 10);
	addstr("                     ");
	for (n = MIDR - 4; n < MIDR - 1; n++) {
		mvaddch(n, MIDC, ' ');
		mvaddch(n + 6, MIDC, ' ');
	}
}

static void
blast(void)
{
	int     n;

	alarm(0);
	move(LINES - 1, 24);
	printw("%3d", torps);
	for (n = LINES - 1 - 2; n >= MIDR + 1; n--) {
		mvaddch(n, MIDC + MIDR - n, '/');
		mvaddch(n, MIDC - MIDR + n, '\\');
		refresh();
	}
	mvaddch(MIDR, MIDC, '*');
	for (n = LINES - 1 - 2; n >= MIDR + 1; n--) {
		mvaddch(n, MIDC + MIDR - n, ' ');
		mvaddch(n, MIDC - MIDR + n, ' ');
		refresh();
	}
	alarm(1);
}

static void
moveenemy(int dummy __unused)
{
	double  d;
	int     oldr, oldc;

	oldr = row;
	oldc = column;
	if (fuel > 0) {
		if (row + dr <= LINES - 3 && row + dr > 0)
			row += dr;
		if (column + dc < COLS - 1 && column + dc > 0)
			column += dc;
	} else
		if (fuel < 0) {
			fuel = 0;
			mvaddstr(0, 60, "*** Out of fuel ***");
		}
	d = (double) ((row - MIDR) * (row - MIDR) + (column - MIDC) *
	    (column - MIDC));
	if (d < 16) {
		row += (rnd(9) - 4) % (4 - abs(row - MIDR));
		column += (rnd(9) - 4) % (4 - abs(column - MIDC));
	}
	ourclock--;
	mvaddstr(oldr, oldc - 1, "   ");
	if (cross)
		target();
	mvaddstr(row, column - 1, "/-\\");
	move(LINES - 1, 24);
	printw("%3d", torps);
	move(LINES - 1, 42);
	printw("%3d", fuel);
	move(LINES - 1, 57);
	printw("%3d", ourclock);
	refresh();
	signal(SIGALRM, moveenemy);
	alarm(1);
}

static void
endfly(void)
{
	alarm(0);
	signal(SIGALRM, SIG_DFL);
	mvcur(0, COLS - 1, LINES - 1, 0);
	endwin();
	signal(SIGTSTP, SIG_DFL);
	signal(SIGINT, oldsig);
}
