src/lib/update/ship.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.
 *
 *  ---
 *
 *  ship.c: Do production for ships
 * 
 *  Known contributors to this file:
 *     Dave Pare, 1986
 *     Steve McClure, 1996
 *     Ron Koenderink, 2004
 *     Markus Armbruster, 2006-2007
 */

#include <config.h>

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

static void shiprepair(struct shpstr *, struct natstr *, struct bp *, int);
static void upd_ship(struct shpstr *, int, struct natstr *, struct bp *, int);
static int feed_ship(struct shpstr *, int);

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

    bp_enable_cachepath();
    for (n = 0; NULL != (sp = getshipp(n)); n++) {
        if (sp->shp_own == 0)
            continue;
        if (sp->shp_own != natnum)
            continue;
        if (sp->shp_effic < SHIP_MINEFF) {
            makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
                     sp->shp_x, sp->shp_y);
            sp->shp_own = 0;
            continue;
        }

        np = getnatp(sp->shp_own);
        if (lastx == 9999 || lasty == 9999) {
            lastx = sp->shp_x;
            lasty = sp->shp_y;
        }
        if (lastx != sp->shp_x || lasty != sp->shp_y) {
            /* Reset the cache */
            bp_disable_cachepath();
            bp_clear_cachepath();
            bp_enable_cachepath();
        }
        start_money = np->nat_money;
        upd_ship(sp, etus, np, bp, build);
        if (build && !player->simulation)       /* make sure to only autonav once */
            nav_ship(sp);       /* autonav the ship */
        sea_money[sp->shp_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();

    if (opt_SAIL) {
        if (build && !player->simulation)       /* make sure to only sail once */
            sail_ship(natnum);
    }
    return k;
}

static void
upd_ship(struct shpstr *sp, int etus,
         struct natstr *np, struct bp *bp, int build)
               /* build = 1, maintain = 0 */
{
    struct sctstr *sectp;
    struct mchrstr *mp;
    int pstage, ptime;
    int oil_gained;
    int max_oil;
    int max_food;
    struct pchrstr *product;
    unsigned char *resource;
    int dep;
    int n;
    int mult;
    int cost;
    int eff;

    mp = &mchr[(int)sp->shp_type];
    if (build == 1) {
        if (!sp->shp_off && np->nat_money >= 0)
            shiprepair(sp, np, bp, etus);
        if (!player->simulation)
            sp->shp_off = 0;
    } else {
        mult = 1;
        if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
            mult = 2;
        cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
        if (np->nat_money < cost && !player->simulation) {
            if ((eff = sp->shp_effic - etus / 5) < SHIP_MINEFF) {
                wu(0, sp->shp_own,
                   "%s lost to lack of maintenance\n", prship(sp));
                makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
                         sp->shp_x, sp->shp_y);
                sp->shp_own = 0;
                return;
            }
            wu(0, sp->shp_own,
               "%s lost %d%% to lack of maintenance\n",
               prship(sp), sp->shp_effic - eff);
            sp->shp_effic = eff;
        } else {
            np->nat_money -= cost;
        }

        if (!player->simulation) {
            sectp = getsectp(sp->shp_x, sp->shp_y);

            /* produce oil */
            if (np->nat_money >= 0
                && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
                product = &pchr[dchr[SCT_OIL].d_prd];
                oil_gained = roundavg(total_work(100, etus,
                                                 sp->shp_item[I_CIVIL],
                                                 sp->shp_item[I_MILIT],
                                                 sp->shp_item[I_UW],
                                                 ITEM_MAX)
                                      * sp->shp_effic / 100.0
                                      * sectp->sct_oil / 100.0
                                      * prod_eff(SCT_OIL, sp->shp_tech));
                max_oil = mp->m_item[I_OIL];
                if (sp->shp_item[I_OIL] + oil_gained > max_oil)
                    oil_gained = max_oil - sp->shp_item[I_OIL];
                if (product->p_nrdep != 0 && oil_gained > 0) {
                    resource = (unsigned char *)sectp + product->p_nrndx;
                    if (*resource * 100 < product->p_nrdep * oil_gained)
                        oil_gained = *resource * 100 / product->p_nrdep;
                    dep = roundavg(oil_gained * product->p_nrdep / 100.0);
                    if (CANT_HAPPEN(dep > *resource))
                        dep = *resource;
                    *resource -= dep;
                }
                sp->shp_item[I_OIL] += oil_gained;
            }
            /* produce fish */
            if (np->nat_money >= 0
                && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
                sp->shp_item[I_FOOD]
                    += roundavg(total_work(100, etus,
                                           sp->shp_item[I_CIVIL],
                                           sp->shp_item[I_MILIT],
                                           sp->shp_item[I_UW],
                                           ITEM_MAX)
                                * sp->shp_effic / 100.0
                                * sectp->sct_fertil / 100.0
                                * prod_eff(SCT_AGRI, sp->shp_tech));
            }
            /* feed */
            if ((n = feed_ship(sp, etus)) > 0) {
                wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
                if (n > 10)
                    nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
            }
            max_food = mp->m_item[I_FOOD];
            if (sp->shp_item[I_FOOD] > max_food)
                sp->shp_item[I_FOOD] = max_food;
            /*
             * do plague stuff.  plague can't break out on ships,
             * but it can still kill people.
             */
            pstage = sp->shp_pstage;
            ptime = sp->shp_ptime;
            if (pstage != PLG_HEALTHY) {
                n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
                switch (n) {
                case PLG_DYING:
                    wu(0, sp->shp_own,
                       "PLAGUE deaths reported on %s\n", prship(sp));
                    nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
                    break;
                case PLG_INFECT:
                    wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
                    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, sp->shp_own,
                               "Outbreak of PLAGUE on %s!\n", prship(sp));
                            nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
                        }
                    } else {
                        /* It has already moved on to "infectious" */
                        wu(0, sp->shp_own,
                           "%s battling PLAGUE\n", prship(sp));
                    }
                    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, sp->shp_own,
                               "Outbreak of PLAGUE on %s!\n", prship(sp));
                            nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
                        }
                    }
                    break;
                default:
                    break;
                }

                sp->shp_pstage = pstage;
                sp->shp_ptime = ptime;
            }
            pops[sp->shp_own] += sp->shp_item[I_CIVIL];
        }
    }
}

/*
 * idea is: a sector full of workers can fix up eight
 * battleships +8 % eff each etu.  This will cost around
 * 8 * 8 * $40 = $2560!
 */
static void
shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
{
    int delta;
    struct sctstr *sp;
    struct mchrstr *mp;
    int build;
    int wf;
    int avail;
    int w_p_eff;
    int mult;
    int mvec[I_MAX + 1];
    int rel;

    mp = &mchr[(int)ship->shp_type];
    sp = getsectp(ship->shp_x, ship->shp_y);

    if ((sp->sct_own != ship->shp_own) && (sp->sct_own != 0)) {
        rel = getrel(getnatp(sp->sct_own), ship->shp_own);

        if (rel < FRIENDLY)
            return;
    }

    wf = 0;
    /* only military can work on a military boat */
    if (ship->shp_glim > 0)
        wf = etus * ship->shp_item[I_MILIT] / 2;
    else
        wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);

    if (sp->sct_type != SCT_HARBR) {
        wf /= 3;
        avail = wf;
    } else {
        if (!player->simulation)
            avail = wf + sp->sct_avail * 100;
        else
            avail = wf + bp_get_avail(bp, sp) * 100;
    }

    w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);

    if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
        return;

    mult = 1;
    if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
        mult = 2;

    if (ship->shp_effic == 100) {
        /* ship is ok; no repairs needed */
        return;
    }

    delta = roundavg((double)avail / w_p_eff);
    if (delta <= 0)
        return;
    if (delta > (int)((float)etus * ship_grow_scale))
        delta = (int)((float)etus * ship_grow_scale);
    if (delta > 100 - ship->shp_effic)
        delta = 100 - ship->shp_effic;

    memset(mvec, 0, sizeof(mvec));
    mvec[I_LCM] = mp->m_lcm;
    mvec[I_HCM] = mp->m_hcm;
    build = get_materials(sp, bp, mvec, delta);

    if (sp->sct_type != SCT_HARBR)
        build = delta;

    wf -= build * w_p_eff;
    if (wf < 0) {
        /*
         * I didn't use roundavg here, because I want to penalize
         * the player with a large number of ships.
         */
        if (!player->simulation)
            avail = (sp->sct_avail * 100 + wf) / 100;
        else
            avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
        if (avail < 0)
            avail = 0;
        if (!player->simulation)
            sp->sct_avail = avail;
        else
            bp_put_avail(bp, sp, avail);
    }
    if (sp->sct_type != SCT_HARBR)
        if ((build + ship->shp_effic) > 80) {
            build = 80 - ship->shp_effic;
            if (build < 0)
                build = 0;
        }

    np->nat_money -= mult * mp->m_cost * build / 100.0;
    if (!player->simulation)
        ship->shp_effic += (signed char)build;
}

/*
 * returns the number who starved, if any.
 */
static int
feed_ship(struct shpstr *sp, int etus)
{
    int needed, take;
    double give;
    struct nstr_item ni;
    struct lndstr *lp;

    if (opt_NOFOOD)
        return 0;

    needed = (int)ceil(food_needed(sp->shp_item, etus));

    /* scrounge */
    if (needed > sp->shp_item[I_FOOD])
        sp->shp_item[I_FOOD] += supply_commod(sp->shp_own,
                                        sp->shp_x, sp->shp_y, I_FOOD,
                                        needed - sp->shp_item[I_FOOD]);
    if (needed > sp->shp_item[I_FOOD]) {
        /* take from embarked land units, but don't starve them */
        snxtitem_all(&ni, EF_LAND);
        while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
            if (lp->lnd_ship != sp->shp_uid)
                continue;
            give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
            if (give < 1.0)
                continue;
            take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
            sp->shp_item[I_FOOD] += take;
            lp->lnd_item[I_FOOD] -= take;
        }
    }

    return feed_people(sp->shp_item, etus);
}

---