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   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                Ken Stevens, Steve McClure, Markus Armbruster
   5  *
   6  *  Empire is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  *  ---
  20  *
  21  *  See files README, COPYING and CREDITS in the root of the source
  22  *  tree for related information and legal notices.  It is expected
  23  *  that future projects/authors will amend these files as needed.
  24  *
  25  *  ---
  26  *
  27  *  ship.c: Do production for ships
  28  *
  29  *  Known contributors to this file:
  30  *     Dave Pare, 1986
  31  *     Steve McClure, 1996
  32  *     Ron Koenderink, 2004
  33  *     Markus Armbruster, 2006-2011
  34  */
  35
  36 #include <config.h>
  37
  38 #include <math.h>
  39 #include "budg.h"
  40 #include "land.h"
  41 #include "lost.h"
  42 #include "news.h"
  43 #include "plague.h"
  44 #include "player.h"
  45 #include "product.h"
  46 #include "ship.h"
  47 #include "update.h"
  48
  49 static void shiprepair(struct shpstr *, struct natstr *, struct bp *, int);
  50 static void upd_ship(struct shpstr *, int, struct natstr *, struct bp *, int);
  51 static int feed_ship(struct shpstr *, int);
  52
  53 int
  54 prod_ship(int etus, int natnum, struct bp *bp, int build)
  55                 /* build = 1, maintain = 0 */
  56 {
  57     struct shpstr *sp;
  58     struct natstr *np;
  59     int n, k = 0;
  60     int start_money;
  61
  62     for (n = 0; NULL != (sp = getshipp(n)); n++) {
  63         if (sp->shp_own == 0)
  64             continue;
  65         if (sp->shp_own != natnum)
  66             continue;
  67         if (sp->shp_effic < SHIP_MINEFF) {
  68             makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
  69                      sp->shp_x, sp->shp_y);
  70             sp->shp_own = 0;
  71             continue;
  72         }
  73
  74         np = getnatp(sp->shp_own);
  75         start_money = np->nat_money;
  76         upd_ship(sp, etus, np, bp, build);
  77         if (build && !player->simulation)       /* make sure to only autonav once */
  78             nav_ship(sp);       /* autonav the ship */
  79         sea_money[sp->shp_own] += np->nat_money - start_money;
  80         if (!build || np->nat_money != start_money)
  81             k++;
  82         if (player->simulation)
  83             np->nat_money = start_money;
  84     }
  85
  86     if (opt_SAIL) {
  87         if (build && !player->simulation)       /* make sure to only sail once */
  88             sail_ship(natnum);
  89     }
  90     return k;
  91 }
  92
  93 static void
  94 upd_ship(struct shpstr *sp, int etus,
  95          struct natstr *np, struct bp *bp, int build)
  96                /* build = 1, maintain = 0 */
  97 {
  98     struct sctstr *sectp;
  99     struct mchrstr *mp;
 100     int pstage, ptime;
 101     int oil_gained;
 102     int max_oil;
 103     int max_food;
 104     struct pchrstr *product;
 105     unsigned char *resource;
 106     int dep;
 107     int n, mult, cost, eff_lost;
 108
 109     mp = &mchr[(int)sp->shp_type];
 110     if (build == 1) {
 111         if (!sp->shp_off && np->nat_money >= 0)
 112             shiprepair(sp, np, bp, etus);
 113         if (!player->simulation)
 114             sp->shp_off = 0;
 115     } else {
 116         mult = 1;
 117         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 118             mult = 2;
 119         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 120         if (np->nat_money < cost && !player->simulation) {
 121             eff_lost = etus / 5;
 122             if (sp->shp_effic - eff_lost < SHIP_MINEFF)
 123                 eff_lost = sp->shp_effic - SHIP_MINEFF;
 124             if (eff_lost > 0) {
 125                 wu(0, sp->shp_own, "%s lost %d%% to lack of maintenance\n",
 126                    prship(sp), eff_lost);
 127                 sp->shp_effic -= eff_lost;
 128             }
 129         } else {
 130             np->nat_money -= cost;
 131         }
 132
 133         if (!player->simulation) {
 134             sectp = getsectp(sp->shp_x, sp->shp_y);
 135
 136             /* produce oil */
 137             if (np->nat_money >= 0
 138                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 139                 product = &pchr[dchr[SCT_OIL].d_prd];
 140                 oil_gained = roundavg(total_work(100, etus,
 141                                                  sp->shp_item[I_CIVIL],
 142                                                  sp->shp_item[I_MILIT],
 143                                                  sp->shp_item[I_UW],
 144                                                  ITEM_MAX)
 145                                       * sp->shp_effic / 100.0
 146                                       * sectp->sct_oil / 100.0
 147                                       * prod_eff(SCT_OIL, sp->shp_tech));
 148                 max_oil = mp->m_item[I_OIL];
 149                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 150                     oil_gained = max_oil - sp->shp_item[I_OIL];
 151                 if (product->p_nrdep != 0 && oil_gained > 0) {
 152                     resource = (unsigned char *)sectp + product->p_nrndx;
 153                     if (*resource * 100 < product->p_nrdep * oil_gained)
 154                         oil_gained = *resource * 100 / product->p_nrdep;
 155                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 156                     if (CANT_HAPPEN(dep > *resource))
 157                         dep = *resource;
 158                     *resource -= dep;
 159                 }
 160                 sp->shp_item[I_OIL] += oil_gained;
 161             }
 162             /* produce fish */
 163             if (np->nat_money >= 0
 164                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 165                 sp->shp_item[I_FOOD]
 166                     += roundavg(total_work(100, etus,
 167                                            sp->shp_item[I_CIVIL],
 168                                            sp->shp_item[I_MILIT],
 169                                            sp->shp_item[I_UW],
 170                                            ITEM_MAX)
 171                                 * sp->shp_effic / 100.0
 172                                 * sectp->sct_fertil / 100.0
 173                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 174             }
 175             /* feed */
 176             if ((n = feed_ship(sp, etus)) > 0) {
 177                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 178                 if (n > 10)
 179                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 180             }
 181             max_food = mp->m_item[I_FOOD];
 182             if (sp->shp_item[I_FOOD] > max_food)
 183                 sp->shp_item[I_FOOD] = max_food;
 184             /*
 185              * do plague stuff.  plague can't break out on ships,
 186              * but it can still kill people.
 187              */
 188             pstage = sp->shp_pstage;
 189             ptime = sp->shp_ptime;
 190             if (pstage != PLG_HEALTHY) {
 191                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 192                 switch (n) {
 193                 case PLG_DYING:
 194                     wu(0, sp->shp_own,
 195                        "PLAGUE deaths reported on %s\n", prship(sp));
 196                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 197                     break;
 198                 case PLG_INFECT:
 199                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 200                     break;
 201                 case PLG_INCUBATE:
 202                     /* Are we still incubating? */
 203                     if (n == pstage) {
 204                         /* Yes. Will it turn "infectious" next time? */
 205                         if (ptime <= etus) {
 206                             /* Yes.  Report an outbreak. */
 207                             wu(0, sp->shp_own,
 208                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 209                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 210                         }
 211                     } else {
 212                         /* It has already moved on to "infectious" */
 213                         wu(0, sp->shp_own,
 214                            "%s battling PLAGUE\n", prship(sp));
 215                     }
 216                     break;
 217                 case PLG_EXPOSED:
 218                     /* Has the plague moved to "incubation" yet? */
 219                     if (n != pstage) {
 220                         /* Yes. Will it turn "infectious" next time? */
 221                         if (ptime <= etus) {
 222                             /* Yes.  Report an outbreak. */
 223                             wu(0, sp->shp_own,
 224                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 225                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 226                         }
 227                     }
 228                     break;
 229                 default:
 230                     break;
 231                 }
 232
 233                 sp->shp_pstage = pstage;
 234                 sp->shp_ptime = ptime;
 235             }
 236             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 237         }
 238     }
 239 }
 240
 241 /*
 242  * idea is: a sector full of workers can fix up eight
 243  * battleships +8 % eff each etu.  This will cost around
 244  * 8 * 8 * $40 = $2560!
 245  */
 246 static void
 247 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 248 {
 249     int delta;
 250     struct sctstr *sp;
 251     struct mchrstr *mp;
 252     int build;
 253     int wf;
 254     int avail;
 255     int w_p_eff;
 256     int mult;
 257     int mvec[I_MAX + 1];
 258
 259     mp = &mchr[(int)ship->shp_type];
 260     sp = getsectp(ship->shp_x, ship->shp_y);
 261
 262     if (sp->sct_own != 0
 263         && relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 264         return;
 265
 266     /* only military can work on a military boat */
 267     if (mp->m_glim != 0)
 268         wf = etus * ship->shp_item[I_MILIT] / 2;
 269     else
 270         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 271
 272     if (sp->sct_type != SCT_HARBR) {
 273         wf /= 3;
 274         avail = wf;
 275     } else {
 276         if (!player->simulation)
 277             avail = wf + sp->sct_avail * 100;
 278         else
 279             avail = wf + bp_get_avail(bp, sp) * 100;
 280     }
 281
 282     w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);
 283
 284     if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
 285         return;
 286
 287     mult = 1;
 288     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 289         mult = 2;
 290
 291     if (ship->shp_effic == 100) {
 292         /* ship is ok; no repairs needed */
 293         return;
 294     }
 295
 296     delta = roundavg((double)avail / w_p_eff);
 297     if (delta <= 0)
 298         return;
 299     if (delta > (int)((float)etus * ship_grow_scale))
 300         delta = (int)((float)etus * ship_grow_scale);
 301     if (delta > 100 - ship->shp_effic)
 302         delta = 100 - ship->shp_effic;
 303
 304     memset(mvec, 0, sizeof(mvec));
 305     mvec[I_LCM] = mp->m_lcm;
 306     mvec[I_HCM] = mp->m_hcm;
 307     build = get_materials(sp, bp, mvec, delta);
 308
 309     if (sp->sct_type != SCT_HARBR)
 310         build = delta;
 311
 312     wf -= build * w_p_eff;
 313     if (wf < 0) {
 314         /*
 315          * I didn't use roundavg here, because I want to penalize
 316          * the player with a large number of ships.
 317          */
 318         if (!player->simulation)
 319             avail = (sp->sct_avail * 100 + wf) / 100;
 320         else
 321             avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
 322         if (avail < 0)
 323             avail = 0;
 324         if (!player->simulation)
 325             sp->sct_avail = avail;
 326         else
 327             bp_put_avail(bp, sp, avail);
 328     }
 329     if (sp->sct_type != SCT_HARBR)
 330         if ((build + ship->shp_effic) > 80) {
 331             build = 80 - ship->shp_effic;
 332             if (build < 0)
 333                 build = 0;
 334         }
 335
 336     np->nat_money -= mult * mp->m_cost * build / 100.0;
 337     if (!player->simulation)
 338         ship->shp_effic += (signed char)build;
 339 }
 340
 341 /*
 342  * returns the number who starved, if any.
 343  */
 344 static int
 345 feed_ship(struct shpstr *sp, int etus)
 346 {
 347     int needed, take;
 348     double give;
 349     struct nstr_item ni;
 350     struct lndstr *lp;
 351
 352     if (opt_NOFOOD)
 353         return 0;
 354
 355     needed = (int)ceil(food_needed(sp->shp_item, etus));
 356
 357     /* scrounge */
 358     if (needed > sp->shp_item[I_FOOD]) {
 359         /* take from embarked land units, but don't starve them */
 360         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 361         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 362             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 363             if (give < 1.0)
 364                 continue;
 365             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 366             sp->shp_item[I_FOOD] += take;
 367             lp->lnd_item[I_FOOD] -= take;
 368         }
 369     }
 370
 371     return feed_people(sp->shp_item, etus);
 372 }