src/lib/commands/tend.c

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/*
 *  Empire - A multi-player, client/server Internet based war game.
 *  Copyright (C) 1986-2007, 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 files README, COPYING and CREDITS in the root of the source
 *  tree for related information and legal notices.  It is expected
 *  that future projects/authors will amend these files as needed.
 *
 *  ---
 *
 *  tend.c: Transfer goodies from one ship to another.
 * 
 *  Known contributors to this file:
 *     Dave Pare, 1986
 *     Thomas Ruschak, 1992
 *     Steve McClure, 2000
 */

#include <config.h>

#include "commands.h"
#include "item.h"
#include "land.h"
#include "plague.h"
#include "plane.h"
#include "ship.h"

static void expose_ship(struct shpstr *s1, struct shpstr *s2);
static int tend_land(struct shpstr *tenderp, char *units);

int
tend(void)
{
    struct nstr_item targets;
    struct nstr_item tenders;
    struct shpstr tender;
    struct shpstr target;
    struct ichrstr *ip;
    struct mchrstr *vbase;
    int amt;
    int retval;
    int ontender;
    int ontarget;
    int maxtender;
    int maxtarget;
    int transfer;
    int total;
    int type;
    char *p;
    char prompt[512];
    char buf[1024];

    if (!(p = getstarg(player->argp[1],
                       "Tend what commodity (or 'land')? ", buf)) || !*p)
        return RET_SYN;

    if (!strncmp(p, "land", 4))
        type = EF_LAND;
    else if (NULL != (ip = item_by_name(p)))
        type = EF_SECTOR;
    else {
        pr("Can't tend '%s'\n", p);
        return RET_SYN;
    }

    if (!snxtitem(&tenders, EF_SHIP,
                  getstarg(player->argp[2], "Tender(s)? ", buf)))
        return RET_SYN;

    while (nxtitem(&tenders, &tender)) {
        if (!player->owner)
            continue;
        if (type == EF_LAND) {
            sprintf(prompt, "Land unit(s) to tend from %s? ",
                    prship(&tender));
            if (!(p = getstarg(player->argp[3], prompt, buf)) || !*p)
                continue;
            if (!check_ship_ok(&tender))
                return RET_SYN;
            if (0 != (retval = tend_land(&tender, p)))
                return retval;
            continue;
        }
        sprintf(prompt, "Number of %s to tend from %s? ",
                ip->i_name, prship(&tender));
        if (!(p = getstarg(player->argp[3], prompt, buf)) || !*p)
            continue;
        if (!check_ship_ok(&tender))
            return RET_SYN;
        if (!(amt = atoi(p))) {
            pr("Amount must be non-zero!\n");
            return RET_SYN;
        }
        ontender = tender.shp_item[ip->i_uid];
        if (ontender == 0 && amt > 0) {
            pr("No %s on %s\n", ip->i_name, prship(&tender));
            return RET_FAIL;
        }
        vbase = &mchr[(int)tender.shp_type];
        maxtender = vbase->m_item[ip->i_uid];
        if (maxtender == 0) {
            pr("A %s cannot hold any %s\n",
               mchr[(int)tender.shp_type].m_name, ip->i_name);
            break;
        }
        if (!snxtitem(&targets, EF_SHIP,
                      getstarg(player->argp[4], "Ships to be tended? ",
                               buf)))
            break;
        if (!check_ship_ok(&tender))
            return RET_SYN;
        total = 0;
        while (nxtitem(&targets, &target)) {
            if (!player->owner &&
                (getrel(getnatp(target.shp_own), player->cnum) < FRIENDLY))
                continue;
            if (target.shp_uid == tender.shp_uid)
                continue;
            if (tender.shp_x != target.shp_x ||
                tender.shp_y != target.shp_y)
                continue;
            ontarget = target.shp_item[ip->i_uid];
            if (ontarget == 0 && amt < 0) {
                pr("No %s on %s\n", ip->i_name, prship(&target));
                continue;
            }
            vbase = &mchr[(int)target.shp_type];
            maxtarget = vbase->m_item[ip->i_uid];
            if (amt < 0) {
                if (!player->owner)
                    amt = 0;

                /* take from target and give to tender */
                transfer = MIN(ontarget, -amt);
                transfer = MIN(maxtender - ontender, transfer);
                if (transfer == 0)
                    continue;
                target.shp_item[ip->i_uid] = ontarget - transfer;
                ontender += transfer;
                total += transfer;
            } else {
                /* give to target from tender */
                transfer = MIN(ontender, amt);
                transfer = MIN(transfer, maxtarget - ontarget);
                if (transfer == 0)
                    continue;
                target.shp_item[ip->i_uid] = ontarget + transfer;
                ontender -= transfer;
                total += transfer;
                if (transfer && target.shp_own != player->cnum) {
                    wu(0, target.shp_own, "%s tended %d %s to %s\n",
                       cname(player->cnum), total, ip->i_name,
                       prship(&target));
                }
            }
            expose_ship(&tender, &target);
            putship(target.shp_uid, &target);
            if (amt > 0 && ontender == 0) {
                pr("%s out of %s\n", prship(&tender), ip->i_name);
                break;
            }
        }
        pr("%d total %s transferred %s %s\n",
           total, ip->i_name, (amt > 0) ? "off of" : "to",
           prship(&tender));
        tender.shp_item[ip->i_uid] = ontender;
        tender.shp_mission = 0;
        putship(tender.shp_uid, &tender);
    }
    return RET_OK;
}

static void
expose_ship(struct shpstr *s1, struct shpstr *s2)
{
    if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
        s2->shp_pstage = PLG_EXPOSED;
    if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
        s1->shp_pstage = PLG_EXPOSED;
}

static int
tend_land(struct shpstr *tenderp, char *units)
{
    struct nstr_item lni;
    struct nstr_item targets;
    struct shpstr target;
    struct lndstr land;
    struct plnstr plane;
    struct nstr_item pni;
    char buf[1024];

    if (!snxtitem(&lni, EF_LAND, units))
        return RET_SYN;

    while (nxtitem(&lni, &land)) {
        if (!player->owner)
            continue;
        if (land.lnd_ship != tenderp->shp_uid) {
            pr("%s is not on %s!\n", prland(&land), prship(tenderp));
            continue;
        }
        if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
            pr("%s does not have \"assault\" capability and can't be tended\n",
               prland(&land));
            continue;
        }
        if (!snxtitem(&targets, EF_SHIP,
                      getstarg(player->argp[4], "Ship to be tended? ",
                               buf)))
            break;
        if (!check_land_ok(&land))
            return RET_SYN;
        while (nxtitem(&targets, &target)) {
            if (!player->owner &&
                (getrel(getnatp(target.shp_own), player->cnum) < FRIENDLY))
                continue;
            if (target.shp_uid == tenderp->shp_uid)
                continue;
            if (tenderp->shp_x != target.shp_x ||
                tenderp->shp_y != target.shp_y)
                continue;

            /* Fit unit on ship */
            count_units(&target);
            getship(target.shp_uid, &target);

            if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
                (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
                   (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
                pr("You can only load light units onto ships,\n"
                   "unless the ship is a non-sub supply ship\n"
                   "%s not tended\n", prland(&land));
                continue;
            }

            if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
                (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
                !mchr[(int)target.shp_type].m_nland) {
                if (target.shp_nland > 1) {
                    pr("%s doesn't have room for more than two spy units!\n",
                       prship(&target));
                    continue;
                }
            } else if (target.shp_nland >= mchr[(int)target.shp_type].m_nland) {
                if (mchr[(int)target.shp_type].m_nland)
                    pr("%s doesn't have room for any more land units!\n",
                       prship(&target));
                else
                    pr("%s doesn't carry land units!\n", prship(&target));
                continue;
            }
            pr("%s transferred from %s to %s\n",
               prland(&land), prship(tenderp), prship(&target));
            sprintf(buf, "loaded on your %s at %s",
                    prship(&target), xyas(target.shp_x, target.shp_y,
                                          target.shp_own));
            gift(target.shp_own, player->cnum, &land, buf);
            land.lnd_ship = target.shp_uid;
            land.lnd_harden = 0;
            land.lnd_mission = 0;
            target.shp_nland++;
            putland(land.lnd_uid, &land);
            expose_ship(tenderp, &target);
            putship(target.shp_uid, &target);
            count_units(tenderp);
            putship(tenderp->shp_uid, tenderp);
            snxtitem_xy(&pni, EF_PLANE, land.lnd_x, land.lnd_y);
            while (nxtitem(&pni, &plane)) {
                if (plane.pln_flags & PLN_LAUNCHED)
                    continue;
                if (plane.pln_land != land.lnd_uid)
                    continue;
                sprintf(buf, "loaded on %s", prship(&target));
                gift(target.shp_own, player->cnum, &plane, buf);
                plane.pln_mission = 0;
                putplane(plane.pln_uid, &plane);
            }
        }
    }
    return 0;
}

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