/*
 *  Empire - A multi-player, client/server Internet based war game.
 *  Copyright (C) 1986-2005, Dave Pare, Jeff Bailey, Thomas Ruschak,
 *                           Ken Stevens, Steve McClure
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  ---
 *
 *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
 *  related information and legal notices. It is expected that any future
 *  projects/authors will amend these files as needed.
 *
 *  ---
 *
 *  bridgefall.c: Knock a bridge down
 * 
 *  Known contributors to this file:
 *     Steve McClure, 1998
 */

#include "misc.h"
#include "plague.h"
#include "sect.h"
#include "path.h"
#include "file.h"
#include "xy.h"
#include "plane.h"
#include "land.h"
#include "nsc.h"
#include "common.h"
#include "subs.h"
#include "lost.h"
#include "optlist.h"

void
bridgefall(struct sctstr *sp, struct emp_qelem *list)
{
    int i;
    int j;
    struct sctstr sect;
    struct sctstr bh_sect;
    int nx;
    int ny;
    int nnx;
    int nny;

    for (i = 1; i <= 6; i++) {
	nx = sp->sct_x + diroff[i][0];
	ny = sp->sct_y + diroff[i][1];
	getsect(nx, ny, &sect);
	if (sect.sct_type != SCT_BSPAN)
	    continue;
	for (j = 1; j <= 6; j++) {
	    nnx = nx + diroff[j][0];
	    nny = ny + diroff[j][1];
	    if (nnx == sp->sct_x && nny == sp->sct_y)
		continue;
	    getsect(nnx, nny, &bh_sect);
	    if (bh_sect.sct_type == SCT_BHEAD &&
		bh_sect.sct_newtype == SCT_BHEAD)
		break;
	    if (bh_sect.sct_type == SCT_BTOWER)
		break;
	    /* With EASY_BRIDGES, it just has to be next to any
	       land */
	    if (opt_EASY_BRIDGES) {
		if (bh_sect.sct_type != SCT_WATER &&
		    bh_sect.sct_type != SCT_BSPAN)
		    break;
	    }
	}
	if (j > 6) {
	    knockdown(&sect, list);
	    putsect(&sect);
	}
    }
}

/* Knock down a bridge span.  Note that this does NOT write the
 * sector out to the database, it's up to the caller to do that. */
void
knockdown(struct sctstr *sp, struct emp_qelem *list)
{
    struct lndstr land;
    struct plnstr plane;
    struct nstr_item ni;
    struct natstr *np;

    if (sp->sct_type == SCT_BTOWER)
	mpr(sp->sct_own,
	    "Crumble... SCREEEECH!  Splash! Bridge tower falls at %s!\n",
	    xyas(sp->sct_x, sp->sct_y, sp->sct_own));
    else
	mpr(sp->sct_own,
	    "Crumble... SCREEEECH!  Splash! Bridge falls at %s!\n",
	    xyas(sp->sct_x, sp->sct_y, sp->sct_own));
    sp->sct_type = SCT_WATER;
    sp->sct_newtype = SCT_WATER;
    makelost(EF_SECTOR, sp->sct_own, 0, sp->sct_x, sp->sct_y);
    sp->sct_own = 0;
    sp->sct_oldown = 0;
    sp->sct_mobil = 0;
    sp->sct_effic = 0;

    /* Sink all the units */
    snxtitem_xy(&ni, EF_LAND, sp->sct_x, sp->sct_y);
    while (nxtitem(&ni, &land)) {
	if (land.lnd_own == 0)
	    continue;
	if (land.lnd_x != sp->sct_x || land.lnd_y != sp->sct_y)
	    continue;
	if (land.lnd_ship >= 0)
	    continue;
	np = getnatp(land.lnd_own);
	if (np->nat_flags & NF_BEEP)
	    mpr(land.lnd_own, "\07");
	mpr(land.lnd_own, "     AARGH! %s tumbles to its doom!\n",
	    prland(&land));
	makelost(EF_LAND, land.lnd_own, land.lnd_uid, land.lnd_x,
		 land.lnd_y);
	land.lnd_own = 0;
	land.lnd_effic = 0;
	putland(land.lnd_uid, &land);
    }
    /* Sink all the planes */
    snxtitem_xy(&ni, EF_PLANE, sp->sct_x, sp->sct_y);
    while (nxtitem(&ni, &plane)) {
	if (plane.pln_own == 0)
	    continue;
	if (plane.pln_x != sp->sct_x || plane.pln_y != sp->sct_y)
	    continue;
	if (plane.pln_flags & PLN_LAUNCHED)
	    continue;
	if (plane.pln_ship >= 0)
	    continue;
	/* Is this plane flying in this list? */
	if (ac_isflying(&plane, list))
	    continue;
	np = getnatp(plane.pln_own);
	if (np->nat_flags & NF_BEEP)
	    mpr(plane.pln_own, "\07");
	mpr(plane.pln_own, "     AARGH! %s tumbles to its doom!\n",
	    prplane(&plane));
	makelost(EF_PLANE, plane.pln_own, plane.pln_uid, plane.pln_x,
		 plane.pln_y);
	plane.pln_own = 0;
	plane.pln_effic = 0;
	putplane(plane.pln_uid, &plane);
    }
    memset(sp->sct_item, 0, sizeof(sp->sct_item));
    memset(sp->sct_del, 0, sizeof(sp->sct_del));
    memset(sp->sct_dist, 0, sizeof(sp->sct_dist));
    sp->sct_pstage = PLG_HEALTHY;
    sp->sct_ptime = 0;
    sp->sct_che = 0;
    sp->sct_che_target = 0;
}