src/lib/update/land.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.
 *
 *  ---
 *
 *  land.c: Do production for land units
 * 
 *  Known contributors to this file:
 *     Dave Pare, 1986
 *     Thomas Ruschak, 1992
 *     Steve McClure, 1996
 *     Markus Armbruster, 2006-2007
 */

#include <config.h>

#include "budg.h"
#include "land.h"
#include "lost.h"
#include "news.h"
#include "plague.h"
#include "player.h"
#include "ship.h"
#include "update.h"
#include <math.h>

static void landrepair(struct lndstr *, struct natstr *, struct bp *, int);
static void upd_land(struct lndstr *, int, struct natstr *, struct bp *, int);
static int feed_land(struct lndstr *, int);

int
prod_land(int etus, int natnum, struct bp *bp, int build)
                /* build = 1, maintain = 0 */
{
    struct lndstr *lp;
    struct sctstr *sp;
    struct natstr *np;
    int n, k = 0;
    int start_money;
    int lastx = 9999, lasty = 9999;

    bp_enable_cachepath();
    for (n = 0; NULL != (lp = getlandp(n)); n++) {
        if (lp->lnd_own == 0)
            continue;
        if (lp->lnd_own != natnum)
            continue;
        if (lp->lnd_effic < LAND_MINEFF) {
            makelost(EF_LAND, lp->lnd_own, lp->lnd_uid,
                     lp->lnd_x, lp->lnd_y);
            lp->lnd_own = 0;
            continue;
        }

        sp = getsectp(lp->lnd_x, lp->lnd_y);
        if (sp->sct_type == SCT_SANCT)
            continue;
        if (lastx == 9999 || lasty == 9999) {
            lastx = lp->lnd_x;
            lasty = lp->lnd_y;
        }
        if (lastx != lp->lnd_x || lasty != lp->lnd_y) {
            /* Reset the cache */
            bp_disable_cachepath();
            bp_clear_cachepath();
            bp_enable_cachepath();
        }
        np = getnatp(lp->lnd_own);
        start_money = np->nat_money;
        upd_land(lp, etus, np, bp, build);
        lnd_money[lp->lnd_own] += np->nat_money - start_money;
        if (!build || np->nat_money != start_money)
            k++;
        if (player->simulation)
            np->nat_money = start_money;
    }
    bp_disable_cachepath();
    bp_clear_cachepath();

    return k;
}

static void
upd_land(struct lndstr *lp, int etus,
         struct natstr *np, struct bp *bp, int build)
               /* build = 1, maintain = 0 */
{
    struct lchrstr *lcp;
    int pstage, ptime;
    int n;
    int min = morale_base - (int)np->nat_level[NAT_HLEV];
    int mult;
    int cost;
    int eff;

    if (!player->simulation)
        if (lp->lnd_retreat < min)
            lp->lnd_retreat = min;

    lcp = &lchr[(int)lp->lnd_type];
    if (build == 1) {
        if (!lp->lnd_off && np->nat_money >= 0)
            landrepair(lp, np, bp, etus);
        if (!player->simulation)
            lp->lnd_off = 0;
    } else {
        mult = 1;
        if (np->nat_level[NAT_TLEV] < lp->lnd_tech * 0.85)
            mult = 2;
        if (lcp->l_flags & L_ENGINEER)
            mult *= 3;
        cost = -(mult * etus * MIN(0.0, money_land * lcp->l_cost));
        if (np->nat_money < cost && !player->simulation) {
            if ((eff = lp->lnd_effic - etus / 5) < LAND_MINEFF) {
                wu(0, lp->lnd_own,
                   "%s lost to lack of maintenance\n", prland(lp));
                makelost(EF_LAND, lp->lnd_own, lp->lnd_uid,
                         lp->lnd_x, lp->lnd_y);
                lp->lnd_own = 0;
                return;
            }
            wu(0, lp->lnd_own,
               "%s lost %d%% to lack of maintenance\n",
               prland(lp), lp->lnd_effic - eff);
            lp->lnd_effic = eff;
        } else {
            np->nat_money -= cost;
        }

        if (!player->simulation) {
            /* feed */
            if ((n = feed_land(lp, etus)) > 0) {
                wu(0, lp->lnd_own, "%d starved in %s%s\n",
                   n, prland(lp),
                   (lp->lnd_effic < LAND_MINEFF ? ", killing it" : ""));
                if (n > 10)
                    nreport(lp->lnd_own, N_DIE_FAMINE, 0, 1);
            }
            /*
             * do plague stuff.  plague can't break out on land units,
             * but it can still kill people on them.
             */
            pstage = lp->lnd_pstage;
            ptime = lp->lnd_ptime;
            if (pstage != PLG_HEALTHY) {
                n = plague_people(np, lp->lnd_item, &pstage, &ptime, etus);
                switch (n) {
                case PLG_DYING:
                    wu(0, lp->lnd_own,
                       "PLAGUE deaths reported on %s\n", prland(lp));
                    nreport(lp->lnd_own, N_DIE_PLAGUE, 0, 1);
                    break;
                case PLG_INFECT:
                    wu(0, lp->lnd_own, "%s battling PLAGUE\n", prland(lp));
                    break;
                case PLG_INCUBATE:
                    /* Are we still incubating? */
                    if (n == pstage) {
                        /* Yes. Will it turn "infectious" next time? */
                        if (ptime <= etus) {
                            /* Yes.  Report an outbreak. */
                            wu(0, lp->lnd_own,
                               "Outbreak of PLAGUE on %s!\n", prland(lp));
                            nreport(lp->lnd_own, N_OUT_PLAGUE, 0, 1);
                        }
                    } else {
                        /* It has already moved on to "infectious" */
                        wu(0, lp->lnd_own,
                           "%s battling PLAGUE\n", prland(lp));
                    }
                    break;
                case PLG_EXPOSED:
                    /* Has the plague moved to "incubation" yet? */
                    if (n != pstage) {
                        /* Yes. Will it turn "infectious" next time? */
                        if (ptime <= etus) {
                            /* Yes.  Report an outbreak. */
                            wu(0, lp->lnd_own,
                               "Outbreak of PLAGUE on %s!\n", prland(lp));
                            nreport(lp->lnd_own, N_OUT_PLAGUE, 0, 1);
                        }
                    }
                    break;
                default:
                    break;
                }
                lp->lnd_pstage = pstage;
                lp->lnd_ptime = ptime;
            }
        }                       /* end !player->simulation */
    }
}

static void
landrepair(struct lndstr *land, struct natstr *np, struct bp *bp, int etus)
{
    int delta;
    struct sctstr *sp;
    struct lchrstr *lp;
    int build;
    int avail;
    int w_p_eff;
    int mult;
    int mvec[I_MAX + 1];

    lp = &lchr[(int)land->lnd_type];
    sp = getsectp(land->lnd_x, land->lnd_y);
    if (sp->sct_off)
        return;
    mult = 1;
    if (np->nat_level[NAT_TLEV] < land->lnd_tech * 0.85)
        mult = 2;

    if (land->lnd_effic == 100) {
        /* land is ok; no repairs needed */
        return;
    }
    if ((sp->sct_own != land->lnd_own) &&
        (getrel(getnatp(sp->sct_own), land->lnd_own) != ALLIED))
        return;

    if (!player->simulation)
        avail = sp->sct_avail * 100;
    else
        avail = bp_get_avail(bp, sp) * 100;

    w_p_eff = LND_BLD_WORK(lp->l_lcm, lp->l_hcm);
    delta = roundavg((double)avail / w_p_eff);
    if (delta <= 0)
        return;
    if (delta > (int)((float)etus * land_grow_scale))
        delta = (int)((float)etus * land_grow_scale);
    if (delta > 100 - land->lnd_effic)
        delta = 100 - land->lnd_effic;

    memset(mvec, 0, sizeof(mvec));
    mvec[I_LCM] = lp->l_lcm;
    mvec[I_HCM] = lp->l_hcm;
    build = get_materials(sp, bp, mvec, delta);

    if ((sp->sct_type != SCT_HEADQ) && (sp->sct_type != SCT_FORTR))
        build /= 3;

    avail -= build * w_p_eff;
    if (avail < 0)
        avail = 0;
    if (!player->simulation)
        sp->sct_avail = avail / 100;
    else
        bp_put_avail(bp, sp, avail / 100);

    if (build < 0)
        logerror("land unit %d building %d ! \n", land->lnd_uid, build);
    np->nat_money -= mult * lp->l_cost * build / 100.0;
    if (!player->simulation) {
        land->lnd_effic += (signed char)build;
    }
}

/*
 * returns the number who starved, if any.
 */
static int
feed_land(struct lndstr *lp, int etus)
{
    int needed;

    if (opt_NOFOOD)
        return 0;

    needed = (int)ceil(food_needed(lp->lnd_item, etus));

    /* scrounge */
    if (needed > lp->lnd_item[I_FOOD])
        resupply_commod(lp, I_FOOD);

    return feed_people(lp->lnd_item, etus);
}

---