server/src/spy.c

#ifdef _MSC_VER
#include <platform.h>
#endif
#include "spy.h"
#include "guard.h"
#include "laws.h"
#include "move.h"
#include "reports.h"
#include "study.h"

/* kernel includes */
#include <kernel/attrib.h>
#include <kernel/config.h>
#include <kernel/item.h>
#include <kernel/faction.h>
#include <kernel/messages.h>
#include <kernel/order.h>
#include <kernel/race.h>
#include <kernel/region.h>
#include <kernel/ship.h>
#include <kernel/terrain.h>
#include <kernel/unit.h>

/* attributes includes */
#include <attributes/otherfaction.h>
#include <attributes/racename.h>
#include <attributes/stealth.h>

/* util includes */
#include <util/base36.h>
#include <util/param.h>
#include <util/parser.h>
#include <util/rand.h>
#include <util/rng.h>
#include <util/strings.h>

/* libc includes */
#include <assert.h>
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

/* in spy steht der Unterschied zwischen Wahrnehmung des Opfers und
* Spionage des Spions */
void spy_message(int spy, const unit * u, const unit * target)
{
    char status[32];

    report_status_depr(target, u->faction->locale, status, sizeof(status));

    ADDMSG(&u->faction->msgs, msg_message("spyreport", "spy target status", u,
        target, status));
    if (spy > 20) {
        magic_t mtype = unit_get_magic(target);
        /* for mages, spells and magic school */
        if (mtype != M_GRAY) {
            ADDMSG(&u->faction->msgs, msg_message("spyreport_mage", "spy target type", u,
                target, magic_school[mtype]));
        }
    }
    if (spy > 6) {
        faction *fv = visible_faction(u->faction, target);
        if (fv && fv != target->faction) {
            /* true faction */
            ADDMSG(&u->faction->msgs, msg_message("spyreport_faction",
                "spy target faction", u, target, target->faction));
            add_seen_faction(u->faction, target->faction);
        }
    }
    if (spy > 0) {
        int first = 1;
        int found = 0;
        skill *sv;
        char buf[4096];

        buf[0] = 0;
        for (sv = target->skills; sv != target->skills + target->skill_size; ++sv) {
            if (sv->level > 0) {
                found++;
                if (first == 1) {
                    first = 0;
                }
                else {
                    str_strlcat(buf, ", ", sizeof(buf));
                }
                str_strlcat(buf, (const char *)skillname((skill_t)sv->id, u->faction->locale),
                    sizeof(buf));
                str_strlcat(buf, " ", sizeof(buf));
                str_strlcat(buf, itoa10(eff_skill(target, sv, target->region)),
                    sizeof(buf));
            }
        }
        if (found) {
            ADDMSG(&u->faction->msgs, msg_message("spyreport_skills", "spy target skills", u,
                target, buf));
        }

        if (target->items) {
            ADDMSG(&u->faction->msgs, msg_message("spyreport_items", "spy target items", u,
                target, target->items));
        }
    }
}

int spy_cmd(unit * u, struct order *ord)
{
    unit *target;
    int spy, observe;
    double spychance, observechance;
    region *r = u->region;

    init_order_depr(ord);
    getunit(r, u->faction, &target);

    if (!target) {
        ADDMSG(&u->faction->msgs,
            msg_feedback(u, u->thisorder, "feedback_unit_not_found", ""));
        return 0;
    }
    if (effskill(u, SK_SPY, NULL) < 1) {
        cmistake(u, u->thisorder, 39, MSG_EVENT);
        return 0;
    }
    /* Die Grundchance fuer einen erfolgreichen Spionage-Versuch ist 10%.
     * Fuer jeden Talentpunkt, den das Spionagetalent das Tarnungstalent
     * des Opfers uebersteigt, erhoeht sich dieses um 5%*/
    spy = effskill(u, SK_SPY, NULL) - effskill(target, SK_STEALTH, r);
    spychance = 0.1 + fmax(spy * 0.05, 0.0);

    if (chance(spychance)) {
        produceexp(u, SK_SPY, u->number);
        spy_message(spy, u, target);
    }
    else {
        ADDMSG(&u->faction->msgs, msg_message("spyfail", "spy target", u, target));
    }

    /* der Spion kann identifiziert werden, wenn das Opfer bessere
     * Wahrnehmung als das Ziel Tarnung + Spionage/2 hat */
    observe = effskill(target, SK_PERCEPTION, r)
        - (effskill(u, SK_STEALTH, NULL) + effskill(u, SK_SPY, NULL) / 2);

    if (invisible(u, target) >= u->number) {
        if (observe > 0) observe = 0;
    }

    /* Anschliessend wird - unabhaengig vom Erfolg - gewuerfelt, ob der
     * Spionageversuch bemerkt wurde. Die Wahrscheinlich dafuer ist (100 -
     * SpionageSpion*5 + WahrnehmungOpfer*2)%. */
    observechance = 1.0 - (effskill(u, SK_SPY, NULL) * 0.05)
        + (effskill(target, SK_PERCEPTION, NULL) * 0.02);

    if (chance(observechance)) {
        ADDMSG(&target->faction->msgs, msg_message("spydetect",
            "spy target", observe > 0 ? u : NULL, target));
    }
    return 0;
}

static bool can_set_factionstealth(const unit * u, const faction * f)
{
    region *lastr = NULL;
    /* for all units mu of our faction, check all the units in the region
     * they are in, if their visible faction is f, it's ok. use lastr to
     * avoid testing the same region twice in a row. */
    unit *mu = u->faction->units;
    while (mu != NULL) {
        if (mu->number && mu->region != lastr) {
            unit *ru = mu->region->units;
            lastr = mu->region;
            while (ru != NULL) {
                if (ru->number) {
                    faction *fv = visible_faction(f, ru);
                    if (fv == f) {
                        if (cansee(f, lastr, ru, 0))
                            return true;
                    }
                }
                ru = ru->next;
            }
        }
        mu = mu->nextF;
    }
    return true;
}

void set_factionstealth(unit *u, faction *f) {
    attrib *a = a_find(u->attribs, &at_otherfaction);
    if (!a)
        a = a_add(&u->attribs, make_otherfaction(f));
    else
        a->data.v = f;
}

int setstealth_cmd(unit * u, struct order *ord)
{
    char token[64];
    const char *s;

    init_order_depr(ord);
    s = gettoken(token, sizeof(token));

    /* Tarne ohne Parameter: Setzt maximale Tarnung */

    if (s == NULL || *s == 0) {
        u_seteffstealth(u, -1);
        return 0;
    }

    if (isdigit(*(const unsigned char *)s)) {
        /* Tarnungslevel setzen */
        int level = atoi((const char *)s);
        if (level > effskill(u, SK_STEALTH, NULL)) {
            ADDMSG(&u->faction->msgs, msg_feedback(u, ord, "error_lowstealth", ""));
            return 0;
        }
        u_seteffstealth(u, level);
        return 0;
    }

    if (skill_enabled(SK_STEALTH)) { /* hack! E3 erlaubt keine Tarnung */
        const race *trace;

        trace = findrace(s, u->faction->locale);
        if (trace) {
            /* demons can cloak as other player-races */
            if (u_race(u) == get_race(RC_DAEMON)) {
                if (playerrace(trace)) {
                    u->irace = trace;
                    if (u_race(u)->flags & RCF_SHAPESHIFTANY && get_racename(u->attribs)) {
                        set_racename(&u->attribs, NULL);
                    }
                }
                return 0;
            }
            /* Singdrachen koennen sich nur als Drachen tarnen */
            else if (u_race(u) == get_race(RC_SONGDRAGON)
                || u_race(u) == get_race(RC_BIRTHDAYDRAGON)) {
                if (trace == get_race(RC_SONGDRAGON) || trace == get_race(RC_FIREDRAGON)
                    || trace == get_race(RC_DRAGON) || trace == get_race(RC_WYRM)) {
                    u->irace = trace;
                    if (u_race(u)->flags & RCF_SHAPESHIFTANY && get_racename(u->attribs))
                        set_racename(&u->attribs, NULL);
                }
                return 0;
            }

            /* Daemomen und Illusionsparteien koennen sich als andere race tarnen */
            if (u_race(u)->flags & RCF_SHAPESHIFT) {
                if (playerrace(trace)) {
                    u->irace = trace;
                    if ((u_race(u)->flags & RCF_SHAPESHIFTANY) && get_racename(u->attribs))
                        set_racename(&u->attribs, NULL);
                }
            }
            return 0;
        }
    }

    switch (findparam(s, u->faction->locale)) {
    case P_FACTION:
        /* TARNE PARTEI [NICHT|NUMMER abcd] */
        s = gettoken(token, sizeof(token));
        if (rule_stealth_anon()) {
            if (!s || *s == 0) {
                u->flags |= UFL_ANON_FACTION;
                break;
            }
            else if (findparam(s, u->faction->locale) == P_NOT) {
                u->flags &= ~UFL_ANON_FACTION;
                break;
            }
        }
        if (rule_stealth_other()) {
            if (get_keyword(s, u->faction->locale) == K_NUMBER) {
                int nr = -1;

                s = gettoken(token, sizeof(token));
                if (s) {
                    nr = atoi36(s);
                }
                if (!s || *s == 0 || nr == u->faction->no) {
                    a_removeall(&u->attribs, &at_otherfaction);
                    break;
                }
                else {
                    struct faction *f = findfaction(nr);
                    if (f == NULL || !can_set_factionstealth(u, f)) {
                        cmistake(u, ord, 66, MSG_EVENT);
                        break;
                    }
                    else {
                        set_factionstealth(u, f);
                        break;
                    }
                }
            }
        }
        cmistake(u, ord, 289, MSG_EVENT);
        break;
    case P_ANY:
    case P_NOT:
        /* TARNE ALLES (was nicht so alles geht?) */
        u_seteffstealth(u, -1);
        break;
    default:
        if (u_race(u)->flags & RCF_SHAPESHIFTANY) {
            set_racename(&u->attribs, s);
        }
        else {
            cmistake(u, ord, 289, MSG_EVENT);
        }
    }
    return 0;
}

static int top_skill(region * r, faction * f, ship * sh, skill_t sk)
{
    int value = 0;
    unit *u;

    for (u = r->units; u; u = u->next) {
        if (u->ship == sh && u->faction == f) {
            int s = effskill(u, sk, NULL);
            if (value < s) value = s;
        }
    }
    return value;
}

static int try_destruction(unit * u, unit * u2, const ship * sh, int skilldiff)
{
    const char *destruction_success_msg = "destroy_ship_0";
    const char *destruction_failed_msg = "destroy_ship_1";
    const char *destruction_detected_msg = "destroy_ship_2";
    const char *detect_failure_msg = "destroy_ship_3";
    const char *object_destroyed_msg = "destroy_ship_4";

    if (skilldiff == 0) {
        /* tell the unit that the attempt failed: */
        ADDMSG(&u->faction->msgs, msg_message(destruction_failed_msg, "ship unit",
            sh, u));
        /* tell the enemy about the attempt: */
        if (u2) {
            ADDMSG(&u2->faction->msgs, msg_message(detect_failure_msg, "ship", sh));
        }
        return 0;
    }
    else if (skilldiff < 0) {
        /* tell the unit that the attempt was detected: */
        ADDMSG(&u->faction->msgs, msg_message(destruction_detected_msg,
            "ship unit", sh, u));
        /* tell the enemy whodunit: */
        if (u2) {
            ADDMSG(&u2->faction->msgs, msg_message(detect_failure_msg, "ship", sh));
        }
        return 0;
    }
    else {
        /* tell the unit that the attempt succeeded */
        ADDMSG(&u->faction->msgs, msg_message(destruction_success_msg, "ship unit",
            sh, u));
        if (u2) {
            ADDMSG(&u2->faction->msgs, msg_message(object_destroyed_msg, "ship", sh));
        }
    }
    return 1;                     /* success */
}

void sink_ship(ship * sh)
{
    unit *u;
    region *r;
    message *sink_msg = NULL;
    faction *f;

    assert(sh && sh->region);
    r = sh->region;

    for (f = NULL, u = r->units; u; u = u->next) {
        /* slight optimization to avoid dereferencing u->faction each time */
        if (f != u->faction) {
            f = u->faction;
            f->flags &= ~FFL_SELECT;
        }
    }

    for (f = NULL, u = r->units; u; u = u->next) {
        /* inform this faction about the sinking ship: */
        if (u->ship == sh) {
            if (f != u->faction) {
                f = u->faction;
                if (!(f->flags & FFL_SELECT)) {
                    f->flags |= FFL_SELECT;
                    if (sink_msg == NULL) {
                        sink_msg = msg_message("sink_msg", "ship region", sh, r);
                    }
                    add_message(&f->msgs, sink_msg);
                }
            }
        }
        else if (f != NULL) {
            break;
        }
    }
    if (sink_msg) {
        msg_release(sink_msg);
    }
}

int sabotage_cmd(unit * u, struct order *ord)
{
    const char *s;
    param_t p;
    ship *sh;
    unit *u2;
    int skdiff = INT_MAX;

    assert(u);
    assert(ord);

    init_order_depr(ord);
    s = getstrtoken();
    p = findparam(s, u->faction->locale);
    init_order_depr(NULL);

    switch (p) {
    case P_SHIP:
        sh = u->ship;
        if (!sh) {
            cmistake(u, u->thisorder, 144, MSG_EVENT);
            return 0;
        }
        u2 = ship_owner(sh);
        if (u2->faction != u->faction) {
            skdiff =
                effskill(u, SK_SPY, NULL) - top_skill(u->region, u2->faction, sh, SK_PERCEPTION);
        }
        if (try_destruction(u, u2, sh, skdiff)) {
            sink_ship(sh);
            /* finally, get rid of the ship */
            remove_ship(&sh->region->ships, sh);
        }
        break;
    default:
        cmistake(u, u->thisorder, 9, MSG_EVENT);
        return 0;
    }

    return 0;
}