/*      $OpenBSD: nova.c,v 1.7 2016/01/07 14:37:51 mestre Exp $ */
/*      $NetBSD: nova.c,v 1.3 1995/04/22 10:59:14 cgd 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 <stdio.h>

#include "trek.h"

/*
**  CAUSE A NOVA TO OCCUR
**
**      A nova occurs.  It is the result of having a star hit with
**      a photon torpedo.  There are several things which may happen.
**      The star may not be affected.  It may go nova.  It may turn
**      into a black hole.  Any (yummy) it may go supernova.
**
**      Stars that go nova cause stars which surround them to undergo
**      the same probabilistic process.  Klingons next to them are
**      destroyed.  And if the starship is next to it, it gets zapped.
**      If the zap is too much, it gets destroyed.
*/

void
nova(int x, int y)
{
        int             i, j;
        int             se;

        if (Sect[x][y] != STAR || Quad[Ship.quadx][Ship.quady].stars < 0)
                return;
        if (ranf(100) < 15)
        {
                printf("Spock: Star at %d,%d failed to nova.\n", x, y);
                return;
        }
        if (ranf(100) < 5)
        {
                snova(x, y);
                return;
        }
        printf("Spock: Star at %d,%d gone nova\n", x, y);

        if (ranf(4) != 0)
                Sect[x][y] = EMPTY;
        else
        {
                Sect[x][y] = HOLE;
                Quad[Ship.quadx][Ship.quady].holes += 1;
        }
        Quad[Ship.quadx][Ship.quady].stars -= 1;
        Game.kills += 1;
        for (i = x - 1; i <= x + 1; i++)
        {
                if (i < 0 || i >= NSECTS)
                        continue;
                for (j = y - 1; j <= y + 1; j++)
                {
                        if (j < 0 || j >= NSECTS)
                                continue;
                        se = Sect[i][j];
                        switch (se)
                        {

                          case EMPTY:
                          case HOLE:
                                break;

                          case KLINGON:
                                killk(i, j);
                                break;

                          case STAR:
                                nova(i, j);
                                break;

                          case INHABIT:
                                kills(i, j, -1);
                                break;

                          case BASE:
                                killb(i, j);
                                Game.killb += 1;
                                break;

                          case ENTERPRISE:
                          case QUEENE:
                                se = 2000;
                                if (Ship.shldup)
                                {
                                        if (Ship.shield >= se)
                                        {
                                                Ship.shield -= se;
                                                se = 0;
                                        }
                                        else
                                        {
                                                se -= Ship.shield;
                                                Ship.shield = 0;
                                        }
                                }
                                Ship.energy -= se;
                                if (Ship.energy <= 0)
                                        lose(L_SUICID);
                                break;

                          default:
                                printf("Unknown object %c at %d,%d destroyed\n",
                                        se, i, j);
                                Sect[i][j] = EMPTY;
                                break;
                        }
                }
        }
}