/*
 *	Eressea PB(E)M host Copyright (C) 1998-2015
 *      Christian Schlittchen (corwin@amber.kn-bremen.de)
 *      Katja Zedel (katze@felidae.kn-bremen.de)
 *      Henning Peters (faroul@beyond.kn-bremen.de)
 *      Enno Rehling (enno@eressea.de)
 *      Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
 *
 *  based on:
 *
 * Atlantis v1.0  13 September 1993 Copyright 1993 by Russell Wallace
 * Atlantis v1.7                    Copyright 1996 by Alex Schröder
 *
 * This program may not be used, modified or distributed without
 * prior permission by the authors of Eressea.
 * This program may not be sold or used commercially without prior written
 * permission from the authors.
 */

#include <platform.h>
#include <kernel/config.h>

#include "economy.h"
#include "chaos.h"
#include "give.h"
#include "monster.h"
#include "laws.h"
#include "keyword.h"

/* triggers includes */
#include <triggers/removecurse.h>

/* attributes includes */
#include <attributes/targetregion.h>
#include <attributes/hate.h>

/* kernel includes */
#include <kernel/build.h>
#include <kernel/curse.h>
#include <kernel/equipment.h>
#include <kernel/faction.h>
#include <kernel/item.h>
#include <kernel/messages.h>
#include <kernel/order.h>
#include <kernel/pathfinder.h>
#include <kernel/pool.h>
#include <kernel/race.h>
#include <kernel/region.h>
#include <kernel/terrain.h>
#include <kernel/terrainid.h>
#include <kernel/unit.h>

#include <move.h>

/* util includes */
#include <util/attrib.h>
#include <util/base36.h>
#include <util/bsdstring.h>
#include <util/event.h>
#include <util/language.h>
#include <util/lists.h>
#include <util/log.h>
#include <util/rand.h>
#include <util/rng.h>

#include <quicklist.h>

/* libc includes */
#include <stdio.h>
#include <string.h>
#include <assert.h>

#define MOVECHANCE                  25  /* chance fuer bewegung */
#define DRAGON_RANGE 20         /* Max. Distanz zum nächsten Drachenziel */
#define MAXILLUSION_TEXTS   3

static void reduce_weight(unit * u)
{
    int capacity, weight = 0;
    item **itmp = &u->items;
    int horses = get_resource(u, get_resourcetype(R_HORSE));

    if (horses > 0) {
        horses = _min(horses, (u->number * 2));
        change_resource(u, get_resourcetype(R_HORSE), -horses);
    }

    /* 0. ditch any vehicles */
    while (*itmp != NULL) {
        item *itm = *itmp;
        const item_type *itype = itm->type;
        weight += itm->number * itype->weight;
        if (itype->flags & ITF_VEHICLE) {
            give_item(itm->number, itm->type, u, NULL, NULL);
        }
        if (*itmp == itm)
            itmp = &itm->next;
    }

    capacity = walkingcapacity(u);

    /* 1. get rid of anything that isn't silver or really lightweight or helpful in combat */
    for (itmp = &u->items; *itmp && capacity > 0;) {
        item *itm = *itmp;
        const item_type *itype = itm->type;
        weight += itm->number * itype->weight;
        if (weight > capacity) {
            if (itype->weight >= 10 && itype->rtype->wtype == 0
                && itype->rtype->atype == 0) {
                if (itype->capacity < itype->weight) {
                    int reduce = _min(itm->number, -((capacity - weight) / itype->weight));
                    give_item(reduce, itm->type, u, NULL, NULL);
                    weight -= reduce * itype->weight;
                }
            }
        }
        if (*itmp == itm)
            itmp = &itm->next;
    }

    for (itmp = &u->items; *itmp && weight > capacity;) {
        item *itm = *itmp;
        const item_type *itype = itm->type;
        weight += itm->number * itype->weight;
        if (itype->capacity < itype->weight) {
            int reduce = _min(itm->number, -((capacity - weight) / itype->weight));
            give_item(reduce, itm->type, u, NULL, NULL);
            weight -= reduce * itype->weight;
        }
        if (*itmp == itm)
            itmp = &itm->next;
    }
}

static float monster_attack_chance(void) {
    return get_param_flt(global.parameters, "rules.monsters.attack_chance", 0.4f);
}

static order *monster_attack(unit * u, const unit * target)
{
    if (u->region != target->region)
        return NULL;
    if (u->faction == target->faction)
        return NULL;
    if (!cansee(u->faction, u->region, target, 0))
        return NULL;
    if (monster_is_waiting(u))
        return NULL;

    return create_order(K_ATTACK, u->faction->locale, "%i", target->no);
}

static order *get_money_for_dragon(region * r, unit * u, int wanted)
{
    unit *u2;
    int n;
    double attack_chance = monster_attack_chance();

    if (attack_chance > 0.0 && is_guard(u, GUARD_TAX)) {
        /* attackiere bewachende Einheiten nur wenn wir selbst schon bewachen */
        for (u2 = r->units; u2; u2 = u2->next) {
            if (u2 != u && is_guard(u2, GUARD_TAX)) {
                /*In E3 + E4 etwas problematisch, da der Regionsbesitzer immer bewacht. Der Drache greift also immer die Burg an!*/
                order *ord = monster_attack(u, u2);
                if (ord)
                    addlist(&u->orders, ord);
            }
        }
    }

    /* falls genug geld in der region ist, treiben wir steuern ein. */
    if (rmoney(r) >= wanted) {
        /* 5% chance, dass der drache aus einer laune raus attackiert */
        if (attack_chance <= 0.0 || chance(1.0 - u_race(u)->aggression)) {
            /* Drachen haben in E3 und E4 keine Einnahmen. Neuer Befehl Pluendern erstmal nur fuer Monster?*/
            return create_order(K_LOOT, default_locale, NULL);
        }
    }

    /* falls der drache launisch ist, oder das regionssilber knapp, greift er alle an */
    n = 0;
    for (u2 = r->units; u2; u2 = u2->next) {
        if (inside_building(u2) != u->building && is_guard(u, GUARD_TAX) && u2->faction != u->faction && cansee(u->faction, r, u2, 0)) {
            int m = get_money(u2);
            if (m == 0 || is_guard(u2, GUARD_TAX) || attack_chance <= 0.0)
                continue;
            else {
                order *ord = monster_attack(u, u2);
                if (ord) {
                    addlist(&u->orders, ord);
                    n += m;
                }
            }
        }
    }

    /* falls die einnahmen erreicht werden, bleibt das monster noch eine */
    /* runde hier. */
    if (n + rmoney(r) >= wanted) {
        keyword_t kwd = keyword_disabled(K_TAX) ? K_LOOT : K_TAX;
        return create_order(kwd, default_locale, NULL);
    }

    /* wenn wir NULL zurueckliefern, macht der drache was anderes, z.b. weggehen */
    return NULL;
}

static int all_money(region * r, faction * f)
{
    unit *u;
    int m;

    m = rmoney(r);
    for (u = r->units; u; u = u->next) {
        if (f != u->faction) {
            m += get_money(u);
        }
    }
    return m;
}

static direction_t richest_neighbour(region * r, faction * f, int absolut)
{

    /* m - maximum an Geld, d - Richtung, i - index, t = Geld hier */

    double m;
    double t;
    direction_t d = NODIRECTION, i;

    if (absolut == 1 || rpeasants(r) == 0) {
        m = (double)all_money(r, f);
    }
    else {
        m = (double)all_money(r, f) / (double)rpeasants(r);
    }

    /* finde die region mit dem meisten geld */

    for (i = 0; i != MAXDIRECTIONS; i++) {
        region *rn = rconnect(r, i);
        if (rn != NULL && fval(rn->terrain, LAND_REGION)) {
            if (absolut == 1 || rpeasants(rn) == 0) {
                t = (double)all_money(rn, f);
            }
            else {
                t = (double)all_money(rn, f) / (double)rpeasants(rn);
            }

            if (t > m) {
                m = t;
                d = i;
            }
        }
    }
    return d;
}

static bool room_for_race_in_region(region * r, const race * rc)
{
    unit *u;
    int c = 0;

    for (u = r->units; u; u = u->next) {
        if (u_race(u) == rc)
            c += u->number;
    }

    if (c > (rc->splitsize * 2))
        return false;

    return true;
}

static direction_t random_neighbour(region * r, unit * u)
{
    int i;
    region *rc;
    region * next[MAXDIRECTIONS];
    int rr, c = 0, c2 = 0;

    get_neighbours(r, next);
    /* Nachsehen, wieviele Regionen in Frage kommen */

    for (i = 0; i != MAXDIRECTIONS; i++) {
        rc = next[i];
        if (rc && can_survive(u, rc)) {
            if (room_for_race_in_region(rc, u_race(u))) {
                c++;
            }
            c2++;
        }
    }

    if (c == 0) {
        if (c2 == 0) {
            return NODIRECTION;
        }
        else {
            c = c2;
            c2 = 0;                   /* c2 == 0 -> room_for_race nicht beachten */
        }
    }

    /* Zufällig eine auswählen */

    rr = rng_int() % c;

    /* Durchzählen */

    c = -1;
    for (i = 0; i != MAXDIRECTIONS; i++) {
        rc = next[i];
        if (rc && can_survive(u, rc)) {
            if (c2 == 0) {
                c++;
            }
            else if (room_for_race_in_region(rc, u_race(u))) {
                c++;
            }
            if (c == rr)
                return (direction_t)i;
        }
    }

    assert(1 == 0);               /* Bis hierhin sollte er niemals kommen. */
    return NODIRECTION;
}

static direction_t treeman_neighbour(region * r)
{
    int i;
    int rr;
    int c = 0;
    region * next[MAXDIRECTIONS];

    get_neighbours(r, next);
    /* Nachsehen, wieviele Regionen in Frage kommen */

    for (i = 0; i != MAXDIRECTIONS; i++) {
        if (next[i] && rterrain(next[i]) != T_OCEAN
            && rterrain(next[i]) != T_GLACIER && rterrain(next[i]) != T_DESERT) {
            ++c;
        }
    }

    if (c == 0) {
        return NODIRECTION;
    }
    /* Zufällig eine auswählen */

    rr = rng_int() % c;

    /* Durchzählen */

    c = -1;
    for (i = 0; i != MAXDIRECTIONS; i++) {
        if (next[i] && rterrain(next[i]) != T_OCEAN
            && rterrain(next[i]) != T_GLACIER && rterrain(next[i]) != T_DESERT) {
            if (++c == rr) {
                return (direction_t)i;
            }
        }
    }

    assert(!"this should never happen");               /* Bis hierhin sollte er niemals kommen. */
    return NODIRECTION;
}

static order *monster_move(region * r, unit * u)
{
    direction_t d = NODIRECTION;

    if (monster_is_waiting(u)) {
        return NULL;
    }
    switch (old_race(u_race(u))) {
    case RC_FIREDRAGON:
    case RC_DRAGON:
    case RC_WYRM:
        d = richest_neighbour(r, u->faction, 1);
        break;
    case RC_TREEMAN:
        d = treeman_neighbour(r);
        break;
    default:
        d = random_neighbour(r, u);
        break;
    }

    /* falls kein geld gefunden wird, zufaellig verreisen, aber nicht in
     * den ozean */

    if (d == NODIRECTION)
        return NULL;

    reduce_weight(u);
    return create_order(K_MOVE, u->faction->locale, "%s",
        LOC(u->faction->locale, directions[d]));
}

static int dragon_affinity_value(region * r, unit * u)
{
    int m = all_money(r, u->faction);

    if (u_race(u) == get_race(RC_FIREDRAGON)) {
        return (int)(normalvariate(m, m / 2));
    }
    else {
        return (int)(normalvariate(m, m / 4));
    }
}

static attrib *set_new_dragon_target(unit * u, region * r, int range)
{
    int max_affinity = 0;
    region *max_region = NULL;
    quicklist *ql, *rlist = regions_in_range(r, range, allowed_dragon);
    int qi;

    for (qi = 0, ql = rlist; ql; ql_advance(&ql, &qi, 1)) {
        region *r2 = (region *)ql_get(ql, qi);
        int affinity = dragon_affinity_value(r2, u);
        if (affinity > max_affinity) {
            max_affinity = affinity;
            max_region = r2;
        }
    }

    ql_free(rlist);

    if (max_region && max_region != r) {
        attrib *a = a_find(u->attribs, &at_targetregion);
        if (!a) {
            a = a_add(&u->attribs, make_targetregion(max_region));
        }
        else {
            a->data.v = max_region;
        }
        return a;
    }
    return NULL;
}

static order *make_movement_order(unit * u, const region * target, int moves,
    bool(*allowed) (const region *, const region *))
{
    region *r = u->region;
    region **plan;
    int bytes, position = 0;
    char zOrder[128], *bufp = zOrder;
    size_t size = sizeof(zOrder) - 1;

    if (monster_is_waiting(u))
        return NULL;

    plan = path_find(r, target, DRAGON_RANGE * 5, allowed);
    if (plan == NULL)
        return NULL;

    bytes =
        (int)strlcpy(bufp,
        (const char *)LOC(u->faction->locale, keyword(K_MOVE)), size);
    if (wrptr(&bufp, &size, bytes) != 0)
        WARN_STATIC_BUFFER();

    while (position != moves && plan[position + 1]) {
        region *prev = plan[position];
        region *next = plan[++position];
        direction_t dir = reldirection(prev, next);
        assert(dir != NODIRECTION && dir != D_SPECIAL);
        if (size > 1) {
            *bufp++ = ' ';
            --size;
        }
        bytes =
            (int)strlcpy(bufp,
            (const char *)LOC(u->faction->locale, directions[dir]), size);
        if (wrptr(&bufp, &size, bytes) != 0)
            WARN_STATIC_BUFFER();
    }

    *bufp = 0;
    return parse_order(zOrder, u->faction->locale);
}

#ifdef TODO_ALP
static order *monster_seeks_target(region * r, unit * u)
{
    direction_t d;
    unit *target = NULL;
    int dist, dist2;
    direction_t i;
    region *nr;

    /* Das Monster sucht ein bestimmtes Opfer. Welches, steht
     * in einer Referenz/attribut
     * derzeit gibt es nur den alp
     */

    switch (old_race(u_race(u))) {
    case RC_ALP:
        target = alp_target(u);
        break;
    default:
        assert(!"Seeker-Monster gibt kein Ziel an");
    }

    /* TODO: prüfen, ob target überhaupt noch existiert... */
    if (!target) {
        log_error("Monster '%s' hat kein Ziel!\n", unitname(u));
        return NULL;                /* this is a bug workaround! remove!! */
    }

    if (r == target->region) {    /* Wir haben ihn! */
        if (u_race(u) == get_race(RC_ALP)) {
            alp_findet_opfer(u, r);
        } else {
            assert(!"Seeker-Monster hat keine Aktion fuer Ziel");
        }
        return NULL;
    }

    /* Simpler Ansatz: Nachbarregion mit gerinster Distanz suchen.
     * Sinnvoll momentan nur bei Monstern, die sich nicht um das
     * Terrain kümmern.  Nebelwände & Co machen derzeit auch nix...
     */
    dist2 = distance(r, target->region);
    d = NODIRECTION;
    for (i = 0; i < MAXDIRECTIONS; i++) {
        nr = rconnect(r, i);
        assert(nr);
        dist = distance(nr, target->region);
        if (dist < dist2) {
            dist2 = dist;
            d = i;
        }
    }
    assert(d != NODIRECTION);

    return create_order(K_MOVE, u->faction->locale, "%s",
        LOC(u->faction->locale, directions[d]));
}
#endif

static void monster_attacks(unit * u)
{
    region *r = u->region;
    unit *u2;

    for (u2 = r->units; u2; u2 = u2->next) {
        if (cansee(u->faction, r, u2, 0) && u2->faction != u->faction && inside_building(u2) != u->building
            && chance(0.75)) {
            order *ord = monster_attack(u, u2);
            if (ord)
                addlist(&u->orders, ord);
        }
    }
}

static const char *random_growl(void)
{
    switch (rng_int() % 5) {
    case 0:
        return "Groammm";
    case 1:
        return "Roaaarrrr";
    case 2:
        return "Chhhhhhhhhh";
    case 3:
        return "Tschrrrkk";
    case 4:
        return "Schhhh";
    }
    return "";
}

extern struct attrib_type at_direction;

static order *monster_learn(unit * u)
{
    int c = 0;
    int n;
    skill *sv;
    const struct locale *lang = u->faction->locale;

    /* can these monsters even study? */
    if (!unit_can_study(u)) {
        return NULL;
    }

    /* Monster lernt ein zufälliges Talent aus allen, in denen es schon
     * Lerntage hat. */
    for (sv = u->skills; sv != u->skills + u->skill_size; ++sv) {
        if (sv->level > 0)
            ++c;
    }

    if (c == 0)
        return NULL;

    n = rng_int() % c + 1;
    c = 0;

    for (sv = u->skills; sv != u->skills + u->skill_size; ++sv) {
        if (sv->level > 0) {
            if (++c == n) {
                return create_order(K_STUDY, lang, "'%s'", skillname(sv->id, lang));
            }
        }
    }
    return NULL;
}

static bool check_overpopulated(unit * u)
{
    unit *u2;
    int c = 0;

    for (u2 = u->region->units; u2; u2 = u2->next) {
        if (u_race(u2) == u_race(u) && u != u2)
            c += u2->number;
    }

    if (c > u_race(u)->splitsize * 2)
        return true;

    return false;
}

static void recruit_dracoids(unit * dragon, int size)
{
    faction *f = dragon->faction;
    region *r = dragon->region;
    const struct item *weapon = NULL;
    order *new_order = NULL;
    unit *un = create_unit(r, f, size, get_race(RC_DRACOID), 0, NULL, NULL);

    fset(un, UFL_ISNEW | UFL_MOVED);

    name_unit(un);
    change_money(dragon, -un->number * 50);
    equip_unit(un, get_equipment("recruited_dracoid"));

    setstatus(un, ST_FIGHT);
    for (weapon = un->items; weapon; weapon = weapon->next) {
        const weapon_type *wtype = weapon->type->rtype->wtype;
        if (wtype && (wtype->flags & WTF_MISSILE)) {
            setstatus(un, ST_BEHIND);
        }
        new_order = create_order(K_STUDY, f->locale, "'%s'",
            skillname(weapon->type->rtype->wtype->skill, f->locale));
    }

    if (new_order != NULL) {
        addlist(&un->orders, new_order);
    }
}

static order *plan_dragon(unit * u)
{
    attrib *ta = a_find(u->attribs, &at_targetregion);
    region *r = u->region;
    region *tr = NULL;
    bool move = false;
    order *long_order = NULL;

    reduce_weight(u);

    if (ta == NULL) {
        move |= (r->land == 0 || r->land->peasants == 0);   /* when no peasants, move */
        move |= (r->land == 0 || r->land->money == 0);      /* when no money, move */
    }
    move |= chance(0.04);         /* 4% chance to change your mind */

    if (u_race(u) == get_race(RC_WYRM) && !move) {
        unit *u2;
        for (u2 = r->units; u2; u2 = u2->next) {
            /* wyrme sind einzelgänger */
            if (u2 == u) {
                /* we do not make room for newcomers, so we don't need to look at them */
                break;
            }
            if (u2 != u && u_race(u2) == u_race(u) && chance(0.5)) {
                move = true;
                break;
            }
        }
    }

    if (move) {
        /* dragon gets bored and looks for a different place to go */
        ta = set_new_dragon_target(u, u->region, DRAGON_RANGE);
    }
    else
        ta = a_find(u->attribs, &at_targetregion);
    if (ta != NULL) {
        tr = (region *)ta->data.v;
        if (tr == NULL || !path_exists(u->region, tr, DRAGON_RANGE, allowed_dragon)) {
            ta = set_new_dragon_target(u, u->region, DRAGON_RANGE);
            if (ta)
                tr = findregion(ta->data.sa[0], ta->data.sa[1]);
        }
    }
    if (tr != NULL) {
        assert(long_order == NULL);
        switch (old_race(u_race(u))) {
        case RC_FIREDRAGON:
            long_order = make_movement_order(u, tr, 4, allowed_dragon);
            break;
        case RC_DRAGON:
            long_order = make_movement_order(u, tr, 3, allowed_dragon);
            break;
        case RC_WYRM:
            long_order = make_movement_order(u, tr, 1, allowed_dragon);
            break;
        default:
            break;
        }
        if (rng_int() % 100 < 15) {
            const struct locale *lang = u->faction->locale;
            /* do a growl */
            if (rname(tr, lang)) {
                addlist(&u->orders,
                    create_order(K_MAIL, lang, "%s '%s... %s %s %s'",
                    LOC(lang, parameters[P_REGION]),
                    random_growl(),
                    u->number ==
                    1 ? "Ich rieche" : "Wir riechen",
                    "etwas in", rname(tr, u->faction->locale)));
            }
        }
    }
    else {
        /* we have no target. do we like it here, then? */
        long_order = get_money_for_dragon(u->region, u, income(u));
        if (long_order == NULL) {
            /* money is gone, need a new target */
            set_new_dragon_target(u, u->region, DRAGON_RANGE);
        }
        else if (u_race(u) != get_race(RC_FIREDRAGON)) {
            /* neue dracoiden! */
            if (r->land && !fval(r->terrain, FORBIDDEN_REGION)) {
                int ra = 20 + rng_int() % 100;
                if (get_money(u) > ra * 50 + 100 && rng_int() % 100 < 50) {
                    recruit_dracoids(u, ra);
                }
            }
        }
    }
    if (long_order == NULL) {
        skill_t sk = SK_PERCEPTION;
        /* study perception (or a random useful skill) */
        while (!skill_enabled(sk) || u_race(u)->bonus[sk] < -5) {
            sk = (skill_t)(rng_int() % MAXSKILLS);
        }
        long_order = create_order(K_STUDY, u->faction->locale, "'%s'",
            skillname(sk, u->faction->locale));
    }
    return long_order;
}

void plan_monsters(faction * f)
{
    region *r;

    assert(f);
    f->lastorders = turn;

    for (r = regions; r; r = r->next) {
        unit *u;
        double attack_chance = monster_attack_chance();
        bool attacking = false;

        for (u = r->units; u; u = u->next) {
            attrib *ta;
            order *long_order = NULL;

            /* Ab hier nur noch Befehle für NPC-Einheiten. */
            if (!is_monsters(u->faction))
                continue;

            if (attack_chance > 0.0) {
                if (chance(attack_chance))
                    attacking = true;
                attack_chance = 0.0;
            }

            if (u->status > ST_BEHIND) {
                setstatus(u, ST_FIGHT);
                /* all monsters fight */
            }
            if (skill_enabled(SK_PERCEPTION)) {
                /* Monster bekommen jede Runde ein paar Tage Wahrnehmung dazu */
                /* TODO: this only works for playerrace */
                produceexp(u, SK_PERCEPTION, u->number);
            }

            /* Befehle müssen jede Runde neu gegeben werden: */
            free_orders(&u->orders);

            if (attacking && is_guard(u, GUARD_TAX)) {
                monster_attacks(u);
            }
            /* units with a plan to kill get ATTACK orders: */
            ta = a_find(u->attribs, &at_hate);
            if (ta && !monster_is_waiting(u)) {
                unit *tu = (unit *)ta->data.v;
                if (tu && tu->region == r) {
                    addlist(&u->orders,
                        create_order(K_ATTACK, u->faction->locale, "%i", tu->no));
                }
                else if (tu) {
                    tu = findunitg(ta->data.i, NULL);
                    if (tu != NULL) {
                        long_order = make_movement_order(u, tu->region, 2, allowed_walk);
                    }
                }
                else
                    a_remove(&u->attribs, ta);
            }

            /* All monsters guard the region: */
            if (!monster_is_waiting(u) && r->land) {
                addlist(&u->orders, create_order(K_GUARD, u->faction->locale, NULL));
            }

            /* Einheiten mit Bewegungsplan kriegen ein NACH: */
            if (long_order == NULL) {
                attrib *ta = a_find(u->attribs, &at_targetregion);
                if (ta) {
                    if (u->region == (region *)ta->data.v) {
                        a_remove(&u->attribs, ta);
                    }
                }
                else if (u_race(u)->flags & RCF_MOVERANDOM) {
                    if (rng_int() % 100 < MOVECHANCE || check_overpopulated(u)) {
                        long_order = monster_move(r, u);
                    }
                }
            }

            if (long_order == NULL && unit_can_study(u)) {
                /* Einheiten, die Waffenlosen Kampf lernen könnten, lernen es um
                 * zu bewachen: */
                if (u_race(u)->bonus[SK_WEAPONLESS] != -99) {
                    if (eff_skill(u, SK_WEAPONLESS, u->region) < 1) {
                        long_order =
                            create_order(K_STUDY, f->locale, "'%s'",
                            skillname(SK_WEAPONLESS, f->locale));
                    }
                }
            }

            if (long_order == NULL) {
                /* Ab hier noch nicht generalisierte Spezialbehandlungen. */

                if (!u->orders) {
                    handle_event(u->attribs, "ai_move", u);
                }

                switch (old_race(u_race(u))) {
                case RC_SEASERPENT:
                    long_order = create_order(K_PIRACY, f->locale, NULL);
                    break;
#ifdef TODO_ALP
                case RC_ALP:
                    long_order = monster_seeks_target(r, u);
                    break;
#endif
                case RC_FIREDRAGON:
                case RC_DRAGON:
                case RC_WYRM:
                    long_order = plan_dragon(u);
                    break;
                default:
                    if (u_race(u)->flags & RCF_LEARN) {
                        long_order = monster_learn(u);
                    }
                    break;
                }
            }
            if (long_order) {
                addlist(&u->orders, long_order);
            }
        }
    }
    pathfinder_cleanup();
}

static double chaosfactor(region * r)
{
    return fval(r, RF_CHAOTIC) ? ((double)(1 + get_chaoscount(r)) / 1000.0) : 0.0;
}

static int nrand(int start, int sub)
{
    int res = 0;

    do {
        if (rng_int() % 100 < start)
            res++;
        start -= sub;
    } while (start > 0);

    return res;
}

/** Drachen und Seeschlangen können entstehen */
void spawn_dragons(void)
{
    region *r;
    faction *monsters = get_or_create_monsters();

    for (r = regions; r; r = r->next) {
        unit *u;

        if (fval(r->terrain, SEA_REGION) && rng_int() % 10000 < 1) {
            u = create_unit(r, monsters, 1, get_race(RC_SEASERPENT), 0, NULL, NULL);
            fset(u, UFL_ISNEW | UFL_MOVED);
            equip_unit(u, get_equipment("monster_seaserpent"));
        }

        if ((r->terrain == newterrain(T_GLACIER)
            || r->terrain == newterrain(T_SWAMP)
            || r->terrain == newterrain(T_DESERT))
            && rng_int() % 10000 < (5 + 100 * chaosfactor(r))) {
            if (chance(0.80)) {
                u = create_unit(r, monsters, nrand(60, 20) + 1, get_race(RC_FIREDRAGON), 0, NULL, NULL);
            }
            else {
                u = create_unit(r, monsters, nrand(30, 20) + 1, get_race(RC_DRAGON), 0, NULL, NULL);
            }
            fset(u, UFL_ISNEW | UFL_MOVED);
            equip_unit(u, get_equipment("monster_dragon"));

            if (verbosity >= 2) {
                log_printf(stdout, "%d %s in %s.\n", u->number,
                    LOC(default_locale,
                    rc_name_s(u_race(u), (u->number == 1) ? NAME_SINGULAR : NAME_PLURAL)), regionname(r, NULL));
            }

            name_unit(u);

            /* add message to the region */
            ADDMSG(&r->msgs,
                msg_message("sighting", "region race number", r, u_race(u), u->number));
        }
    }
}

/** Untote können entstehen */
void spawn_undead(void)
{
    region *r;
    faction *monsters = get_monsters();

    for (r = regions; r; r = r->next) {
        int unburied = deathcount(r);
        static const curse_type *ctype = NULL;

        if (!ctype)
            ctype = ct_find("holyground");
        if (ctype && curse_active(get_curse(r->attribs, ctype)))
            continue;

        /* Chance 0.1% * chaosfactor */
        if (r->land && unburied > r->land->peasants / 20
            && rng_int() % 10000 < (100 + 100 * chaosfactor(r))) {
            unit *u;
            /* es ist sinnfrei, wenn irgendwo im Wald 3er-Einheiten Untote entstehen.
             * Lieber sammeln lassen, bis sie mindestens 5% der Bevölkerung sind, und
             * dann erst auferstehen. */
            int undead = unburied / (rng_int() % 2 + 1);
            const race *rc = NULL;
            int i;
            if (r->age < 100)
                undead = undead * r->age / 100; /* newbie-regionen kriegen weniger ab */

            if (!undead || r->age < 20)
                continue;

            switch (rng_int() % 3) {
            case 0:
                rc = get_race(RC_SKELETON);
                break;
            case 1:
                rc = get_race(RC_ZOMBIE);
                break;
            default:
                rc = get_race(RC_GHOUL);
                break;
            }

            u = create_unit(r, monsters, undead, rc, 0, NULL, NULL);
            fset(u, UFL_ISNEW | UFL_MOVED);
            if ((rc == get_race(RC_SKELETON) || rc == get_race(RC_ZOMBIE))
                && rng_int() % 10 < 4) {
                equip_unit(u, get_equipment("rising_undead"));
            }

            for (i = 0; i < MAXSKILLS; i++) {
                if (rc->bonus[i] >= 1) {
                    set_level(u, (skill_t)i, 1);
                }
            }
            u->hp = unit_max_hp(u) * u->number;

            deathcounts(r, -undead);
            name_unit(u);

            if (verbosity >= 2) {
                log_printf(stdout, "%d %s in %s.\n", u->number,
                    LOC(default_locale,
                    rc_name_s(u_race(u), (u->number == 1) ? NAME_SINGULAR : NAME_PLURAL)), regionname(r, NULL));
            }

      {
          message *msg = msg_message("undeadrise", "region", r);
          add_message(&r->msgs, msg);
          for (u = r->units; u; u = u->next)
              freset(u->faction, FFL_SELECT);
          for (u = r->units; u; u = u->next) {
              if (fval(u->faction, FFL_SELECT))
                  continue;
              fset(u->faction, FFL_SELECT);
              add_message(&u->faction->msgs, msg);
          }
          msg_release(msg);
      }
        }
        else {
            int i = deathcount(r);
            if (i) {
                /* Gräber verwittern, 3% der Untoten finden die ewige Ruhe */
                deathcounts(r, (int)(-i * 0.03));
            }
        }
    }
}