/*      $NetBSD: move_robs.c,v 1.10 2009/07/20 06:39:06 dholland Exp $  */

/*
* Copyright (c) 1980, 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[] = "@(#)move_robs.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: move_robs.c,v 1.10 2009/07/20 06:39:06 dholland Exp $");
#endif
#endif /* not lint */

#include <curses.h>
#include <signal.h>
#include <unistd.h>
#include "robots.h"

/*
* move_robots:
*      Move the robots around
*/
void
move_robots(int was_sig)
{
       COORD *rp;

       if (Real_time)
               signal(SIGALRM, move_robots);
#ifdef DEBUG
       move(Min.y, Min.x);
       addch(inch());
       move(Max.y, Max.x);
       addch(inch());
#endif /* DEBUG */
       for (rp = Robots; rp < &Robots[MAXROBOTS]; rp++) {
               if (rp->y < 0)
                       continue;
               mvaddch(rp->y, rp->x, ' ');
               Field[rp->y][rp->x]--;
               rp->y += sign(My_pos.y - rp->y);
               rp->x += sign(My_pos.x - rp->x);
               if (rp->y <= 0)
                       rp->y = 0;
               else if (rp->y >= Y_FIELDSIZE)
                       rp->y = Y_FIELDSIZE - 1;
               if (rp->x <= 0)
                       rp->x = 0;
               else if (rp->x >= X_FIELDSIZE)
                       rp->x = X_FIELDSIZE - 1;
               Field[rp->y][rp->x]++;
       }

       Min.y = Y_FIELDSIZE;
       Min.x = X_FIELDSIZE;
       Max.y = 0;
       Max.x = 0;
       for (rp = Robots; rp < &Robots[MAXROBOTS]; rp++)
               if (rp->y < 0)
                       continue;
               else if (rp->y == My_pos.y && rp->x == My_pos.x)
                       Dead = true;
               else if (Field[rp->y][rp->x] > 1) {
                       mvaddch(rp->y, rp->x, HEAP);
                       Scrap[Num_scrap++] = *rp;
                       rp->y = -1;
                       Num_robots--;
                       if (Waiting)
                               Wait_bonus++;
                       add_score(ROB_SCORE);
               }
               else {
                       mvaddch(rp->y, rp->x, ROBOT);
                       if (rp->y < Min.y)
                               Min.y = rp->y;
                       if (rp->x < Min.x)
                               Min.x = rp->x;
                       if (rp->y > Max.y)
                               Max.y = rp->y;
                       if (rp->x > Max.x)
                               Max.x = rp->x;
               }

       if (was_sig) {
               refresh();
               if (Dead || Num_robots <= 0)
                       longjmp(End_move, 0);
       }

#ifdef DEBUG
       standout();
       move(Min.y, Min.x);
       addch(inch());
       move(Max.y, Max.x);
       addch(inch());
       standend();
#endif /* DEBUG */
       if (Real_time)
               alarm(3);
}

/*
* add_score:
*      Add a score to the overall point total
*/
void
add_score(int add)
{
       Score += add;
       move(Y_SCORE, X_SCORE);
       printw("%d", Score);
}

/*
* sign:
*      Return the sign of the number
*/
int
sign(int n)
{
       if (n < 0)
               return -1;
       else if (n > 0)
               return 1;
       else
               return 0;
}