/*      $OpenBSD: hack.do.c,v 1.11 2019/06/28 13:32:52 deraadt Exp $    */

/*
 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
 * Amsterdam
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Stichting Centrum voor Wiskunde en
 * Informatica, nor the names of its contributors may be used to endorse or
 * promote products derived from this software without specific prior
 * written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* Contains code for 'd', 'D' (drop), '>', '<' (up, down) and 't' (throw) */

#include <stdlib.h>
#include <unistd.h>

#include "hack.h"

extern boolean level_exists[];
extern struct monst youmonst;
extern char *nomovemsg;

static int drop(struct obj *);

int
dodrop(void)
{
        return(drop(getobj("0$#", "drop")));
}

static int
drop(struct obj *obj)
{
        if(!obj) return(0);
        if(obj->olet == '$') {          /* pseudo object */
                long amount = OGOLD(obj);

                if(amount == 0)
                        pline("You didn't drop any gold pieces.");
                else {
                        mkgold(amount, u.ux, u.uy);
                        pline("You dropped %ld gold piece%s.",
                                amount, plur(amount));
                        if(Invisible) newsym(u.ux, u.uy);
                }
                free(obj);
                return(1);
        }
        if(obj->owornmask & (W_ARMOR | W_RING)){
                pline("You cannot drop something you are wearing.");
                return(0);
        }
        if(obj == uwep) {
                if(uwep->cursed) {
                        pline("Your weapon is welded to your hand!");
                        return(0);
                }
                setuwep((struct obj *) 0);
        }
        pline("You dropped %s.", doname(obj));
        dropx(obj);
        return(1);
}

/* Called in several places - should not produce texts */
void
dropx(struct obj *obj)
{
        freeinv(obj);
        dropy(obj);
}

void
dropy(struct obj *obj)
{
        if(obj->otyp == CRYSKNIFE)
                obj->otyp = WORM_TOOTH;
        obj->ox = u.ux;
        obj->oy = u.uy;
        obj->nobj = fobj;
        fobj = obj;
        if(Invisible) newsym(u.ux,u.uy);
        subfrombill(obj);
        stackobj(obj);
}

/* drop several things */
int
doddrop(void)
{
        return(ggetobj("drop", drop, 0));
}

int
dodown(void)
{
        if(u.ux != xdnstair || u.uy != ydnstair) {
                pline("You can't go down here.");
                return(0);
        }
        if(u.ustuck) {
                pline("You are being held, and cannot go down.");
                return(1);
        }
        if(Levitation) {
                pline("You're floating high above the stairs.");
                return(0);
        }

        goto_level(dlevel+1, TRUE);
        return(1);
}

int
doup(void)
{
        if(u.ux != xupstair || u.uy != yupstair) {
                pline("You can't go up here.");
                return(0);
        }
        if(u.ustuck) {
                pline("You are being held, and cannot go up.");
                return(1);
        }
        if(!Levitation && inv_weight() + 5 > 0) {
                pline("Your load is too heavy to climb the stairs.");
                return(1);
        }

        goto_level(dlevel-1, TRUE);
        return(1);
}

void
goto_level(int newlevel, boolean at_stairs)
{
        int fd;
        boolean up = (newlevel < dlevel);

        if(newlevel <= 0) done("escaped");    /* in fact < 0 is impossible */
        if(newlevel > MAXLEVEL) newlevel = MAXLEVEL;    /* strange ... */
        if(newlevel == dlevel) return;        /* this can happen */

        glo(dlevel);
        fd = open(lock, O_CREAT | O_TRUNC | O_WRONLY, FMASK);
        if(fd == -1) {
                /*
                 * This is not quite impossible: e.g., we may have
                 * exceeded our quota. If that is the case then we
                 * cannot leave this level, and cannot save either.
                 * Another possibility is that the directory was not
                 * writable.
                 */
                pline("A mysterious force prevents you from going %s.",
                        up ? "up" : "down");
                return;
        }

        if(Punished) unplacebc();
        u.utrap = 0;                            /* needed in level_tele */
        u.ustuck = 0;                           /* idem */
        keepdogs();
        seeoff(1);
        if(u.uswallow)                          /* idem */
                u.uswldtim = u.uswallow = 0;
        flags.nscrinh = 1;
        u.ux = FAR;                             /* hack */
        (void) inshop();                        /* probably was a trapdoor */

        savelev(fd,dlevel);
        (void) close(fd);

        dlevel = newlevel;
        if(maxdlevel < dlevel)
                maxdlevel = dlevel;
        glo(dlevel);

        if(!level_exists[(int)dlevel])
                mklev();
        else {
                extern int hackpid;

                if((fd = open(lock, O_RDONLY)) == -1) {
                        pline("Cannot open %s .", lock);
                        pline("Probably someone removed it.");
                        done("tricked");
                }
                getlev(fd, hackpid, dlevel);
                (void) close(fd);
        }

        if(at_stairs) {
            if(up) {
                u.ux = xdnstair;
                u.uy = ydnstair;
                if(!u.ux) {             /* entering a maze from below? */
                    u.ux = xupstair;    /* this will confuse the player! */
                    u.uy = yupstair;
                }
                if(Punished && !Levitation){
                        pline("With great effort you climb the stairs.");
                        placebc(1);
                }
            } else {
                u.ux = xupstair;
                u.uy = yupstair;
                if(inv_weight() + 5 > 0 || Punished){
                        pline("You fall down the stairs.");     /* %% */
                        losehp(rnd(3), "fall");
                        if(Punished) {
                            if(uwep != uball && rn2(3)){
                                pline("... and are hit by the iron ball.");
                                losehp(rnd(20), "iron ball");
                            }
                            placebc(1);
                        }
                        selftouch("Falling, you");
                }
            }
            { struct monst *mtmp = m_at(u.ux, u.uy);
              if(mtmp)
                mnexto(mtmp);
            }
        } else {        /* trapdoor or level_tele */
            do {
                u.ux = rnd(COLNO-1);
                u.uy = rn2(ROWNO);
            } while(levl[(int)u.ux][(int)u.uy].typ != ROOM ||
                        m_at(u.ux,u.uy));
            if(Punished){
                if(uwep != uball && !up /* %% */ && rn2(5)){
                        pline("The iron ball falls on your head.");
                        losehp(rnd(25), "iron ball");
                }
                placebc(1);
            }
            selftouch("Falling, you");
        }
        (void) inshop();
        initrack();

        losedogs();
        { struct monst *mtmp;
          if ((mtmp = m_at(u.ux, u.uy)))
                  mnexto(mtmp); /* riv05!a3 */
        }
        flags.nscrinh = 0;
        setsee();
        seeobjs();      /* make old cadavers disappear - riv05!a3 */
        docrt();
        pickup(1);
        read_engr_at(u.ux,u.uy);
}

int
donull(void)
{
        return(1);      /* Do nothing, but let other things happen */
}

int
dopray(void)
{
        nomovemsg = "You finished your prayer.";
        nomul(-3);
        return(1);
}

int
dothrow(void)
{
        struct obj *obj;
        struct monst *mon;
        int tmp;

        obj = getobj("#)", "throw");   /* it is also possible to throw food */
                                       /* (or jewels, or iron balls ... ) */
        if(!obj || !getdir(1))         /* ask "in what direction?" */
                return(0);
        if(obj->owornmask & (W_ARMOR | W_RING)){
                pline("You can't throw something you are wearing.");
                return(0);
        }

        u_wipe_engr(2);

        if(obj == uwep){
                if(obj->cursed){
                        pline("Your weapon is welded to your hand.");
                        return(1);
                }
                if(obj->quan > 1)
                        setuwep(splitobj(obj, 1));
                else
                        setuwep((struct obj *) 0);
        }
        else if(obj->quan > 1)
                (void) splitobj(obj, 1);
        freeinv(obj);
        if(u.uswallow) {
                mon = u.ustuck;
                bhitpos.x = mon->mx;
                bhitpos.y = mon->my;
        } else if(u.dz) {
          if(u.dz < 0) {
            pline("%s hits the ceiling, then falls back on top of your head.",
                Doname(obj));           /* note: obj->quan == 1 */
            if(obj->olet == POTION_SYM)
                potionhit(&youmonst, obj);
            else {
                if(uarmh) pline("Fortunately, you are wearing a helmet!");
                losehp(uarmh ? 1 : rnd((int)(obj->owt)), "falling object");
                dropy(obj);
            }
          } else {
            pline("%s hits the floor.", Doname(obj));
            if(obj->otyp == EXPENSIVE_CAMERA) {
                pline("It is shattered in a thousand pieces!");
                obfree(obj, Null(obj));
            } else if(obj->otyp == EGG) {
                pline("\"Splash!\"");
                obfree(obj, Null(obj));
            } else if(obj->olet == POTION_SYM) {
                pline("The flask breaks, and you smell a peculiar odor ...");
                potionbreathe(obj);
                obfree(obj, Null(obj));
            } else {
                dropy(obj);
            }
          }
          return(1);
        } else if(obj->otyp == BOOMERANG) {
                mon = boomhit(u.dx, u.dy);
                if(mon == &youmonst) {          /* the thing was caught */
                        (void) addinv(obj);
                        return(1);
                }
        } else {
                if(obj->otyp == PICK_AXE && shkcatch(obj))
                    return(1);

                mon = bhit(u.dx, u.dy, (obj->otyp == ICE_BOX) ? 1 :
                        (!Punished || obj != uball) ? 8 : !u.ustuck ? 5 : 1,
                        obj->olet, NULL, NULL, obj);
        }
        if(mon) {
                /* awake monster if sleeping */
                wakeup(mon);

                if(obj->olet == WEAPON_SYM) {
                        tmp = -1+u.ulevel+mon->data->ac+abon();
                        if(obj->otyp < ROCK) {
                                if(!uwep ||
                                    uwep->otyp != obj->otyp+(BOW-ARROW))
                                        tmp -= 4;
                                else {
                                        tmp += uwep->spe;
                                }
                        } else
                        if(obj->otyp == BOOMERANG) tmp += 4;
                        tmp += obj->spe;
                        if(u.uswallow || tmp >= rnd(20)) {
                                if(hmon(mon,obj,1) == TRUE){
                                  /* mon still alive */
#ifndef NOWORM
                                  cutworm(mon,bhitpos.x,bhitpos.y,obj->otyp);
#endif /* NOWORM */
                                } else mon = 0;
                                /* weapons thrown disappear sometimes */
                                if(obj->otyp < BOOMERANG && rn2(3)) {
                                        /* check bill; free */
                                        obfree(obj, (struct obj *) 0);
                                        return(1);
                                }
                        } else miss(objects[obj->otyp].oc_name, mon);
                } else if(obj->otyp == HEAVY_IRON_BALL) {
                        tmp = -1+u.ulevel+mon->data->ac+abon();
                        if(!Punished || obj != uball) tmp += 2;
                        if(u.utrap) tmp -= 2;
                        if(u.uswallow || tmp >= rnd(20)) {
                                if(hmon(mon,obj,1) == FALSE)
                                        mon = 0;        /* he died */
                        } else miss("iron ball", mon);
                } else if(obj->olet == POTION_SYM && u.ulevel > rn2(15)) {
                        potionhit(mon, obj);
                        return(1);
                } else {
                        if(cansee(bhitpos.x,bhitpos.y))
                                pline("You miss %s.",monnam(mon));
                        else pline("You miss it.");
                        if(obj->olet == FOOD_SYM && mon->data->mlet == 'd')
                                if(tamedog(mon,obj)) return(1);
                        if(obj->olet == GEM_SYM && mon->data->mlet == 'u' &&
                                !mon->mtame){
                         if(obj->dknown && objects[obj->otyp].oc_name_known){
                          if(objects[obj->otyp].g_val > 0){
                            u.uluck += 5;
                            goto valuable;
                          } else {
                            pline("%s is not interested in your junk.",
                                Monnam(mon));
                          }
                         } else { /* value unknown to @ */
                            u.uluck++;
                        valuable:
                            if(u.uluck > LUCKMAX)       /* dan@ut-ngp */
                                u.uluck = LUCKMAX;
                            pline("%s graciously accepts your gift.",
                                Monnam(mon));
                            mpickobj(mon, obj);
                            rloc(mon);
                            return(1);
                         }
                        }
                }
        }
                /* the code following might become part of dropy() */
        if(obj->otyp == CRYSKNIFE)
                obj->otyp = WORM_TOOTH;
        obj->ox = bhitpos.x;
        obj->oy = bhitpos.y;
        obj->nobj = fobj;
        fobj = obj;
        /* prevent him from throwing articles to the exit and escaping */
        /* subfrombill(obj); */
        stackobj(obj);
        if(Punished && obj == uball &&
                (bhitpos.x != u.ux || bhitpos.y != u.uy)){
                freeobj(uchain);
                unpobj(uchain);
                if(u.utrap){
                        if(u.utraptype == TT_PIT)
                                pline("The ball pulls you out of the pit!");
                        else {
                            long side =
                                rn2(3) ? LEFT_SIDE : RIGHT_SIDE;
                            pline("The ball pulls you out of the bear trap.");
                            pline("Your %s leg is severely damaged.",
                                (side == LEFT_SIDE) ? "left" : "right");
                            set_wounded_legs(side, 500+rn2(1000));
                            losehp(2, "thrown ball");
                        }
                        u.utrap = 0;
                }
                unsee();
                uchain->nobj = fobj;
                fobj = uchain;
                u.ux = uchain->ox = bhitpos.x - u.dx;
                u.uy = uchain->oy = bhitpos.y - u.dy;
                setsee();
                (void) inshop();
        }
        if(cansee(bhitpos.x, bhitpos.y)) prl(bhitpos.x,bhitpos.y);
        return(1);
}

/* split obj so that it gets size num */
/* remainder is put in the object structure delivered by this call */
struct obj *
splitobj(struct obj *obj, int num)
{
        struct obj *otmp;

        otmp = newobj(0);
        *otmp = *obj;           /* copies whole structure */
        otmp->o_id = flags.ident++;
        otmp->onamelth = 0;
        obj->quan = num;
        obj->owt = weight(obj);
        otmp->quan -= num;
        otmp->owt = weight(otmp);       /* -= obj->owt ? */
        obj->nobj = otmp;
        if(obj->unpaid) splitbill(obj,otmp);
        return(otmp);
}

void
more_experienced(int exp, int rexp)
{
        extern char pl_character[];

        u.uexp += exp;
        u.urexp += 4*exp + rexp;
        if(exp) flags.botl = 1;
        if(u.urexp >= ((pl_character[0] == 'W') ? 1000 : 2000))
                flags.beginner = 0;
}

void
set_wounded_legs(long side, int timex)
{
        if(!Wounded_legs || (Wounded_legs & TIMEOUT))
                Wounded_legs |= side + timex;
        else
                Wounded_legs |= side;
}

void
heal_legs(void)
{
        if(Wounded_legs) {
                if((Wounded_legs & BOTH_SIDES) == BOTH_SIDES)
                        pline("Your legs feel somewhat better.");
                else
                        pline("Your leg feels somewhat better.");
                Wounded_legs = 0;
        }
}