/*      $OpenBSD: hack.trap.c,v 1.9 2016/01/09 18:33:15 mestre 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.
 */

#include <ctype.h>
#include <stdlib.h>

#include "hack.h"

char vowels[] = "aeiou";

char *traps[] = {
        " bear trap",
        "n arrow trap",
        " dart trap",
        " trapdoor",
        " teleportation trap",
        " pit",
        " sleeping gas trap",
        " piercer",
        " mimic"
};

static void vtele(void);
static void teleds(int, int);
static int  teleok(int, int);

struct trap *
maketrap(int x, int y, int typ)
{
        struct trap *ttmp;

        ttmp = newtrap();
        ttmp->ttyp = typ;
        ttmp->tseen = 0;
        ttmp->once = 0;
        ttmp->tx = x;
        ttmp->ty = y;
        ttmp->ntrap = ftrap;
        ftrap = ttmp;
        return(ttmp);
}

void
dotrap(struct trap *trap)
{
        int ttype = trap->ttyp;

        nomul(0);
        if(trap->tseen && !rn2(5) && ttype != PIT)
                pline("You escape a%s.", traps[ttype]);
        else {
                trap->tseen = 1;
                switch(ttype) {
                case SLP_GAS_TRAP:
                        pline("A cloud of gas puts you to sleep!");
                        nomul(-rnd(25));
                        break;
                case BEAR_TRAP:
                        if(Levitation) {
                                pline("You float over a bear trap.");
                                break;
                        }
                        u.utrap = 4 + rn2(4);
                        u.utraptype = TT_BEARTRAP;
                        pline("A bear trap closes on your foot!");
                        break;
                case PIERC:
                        deltrap(trap);
                        if(makemon(PM_PIERCER,u.ux,u.uy)) {
                          pline("A piercer suddenly drops from the ceiling!");
                          if(uarmh)
                                pline("Its blow glances off your helmet.");
                          else
                                (void) thitu(3,d(4,6),"falling piercer");
                        }
                        break;
                case ARROW_TRAP:
                        pline("An arrow shoots out at you!");
                        if(!thitu(8,rnd(6),"arrow")){
                                mksobj_at(ARROW, u.ux, u.uy);
                                fobj->quan = 1;
                        }
                        break;
                case TRAPDOOR:
                        if(!xdnstair) {
pline("A trap door in the ceiling opens and a rock falls on your head!");
if(uarmh) pline("Fortunately, you are wearing a helmet!");
                            losehp(uarmh ? 2 : d(2,10),"falling rock");
                            mksobj_at(ROCK, u.ux, u.uy);
                            fobj->quan = 1;
                            stackobj(fobj);
                            if(Invisible) newsym(u.ux, u.uy);
                        } else {
                            int newlevel = dlevel + 1;
                                while(!rn2(4) && newlevel < 29)
                                        newlevel++;
                                pline("A trap door opens up under you!");
                                if(Levitation || u.ustuck) {
                                pline("For some reason you don't fall in.");
                                        break;
                                }

                                goto_level(newlevel, FALSE);
                        }
                        break;
                case DART_TRAP:
                        pline("A little dart shoots out at you!");
                        if(thitu(7,rnd(3),"little dart")) {
                            if(!rn2(6))
                                poisoned("dart","poison dart");
                        } else {
                                mksobj_at(DART, u.ux, u.uy);
                                fobj->quan = 1;
                        }
                        break;
                case TELEP_TRAP:
                        if(trap->once) {
                                deltrap(trap);
                                newsym(u.ux,u.uy);
                                vtele();
                        } else {
                                newsym(u.ux,u.uy);
                                tele();
                        }
                        break;
                case PIT:
                        if(Levitation) {
                                pline("A pit opens up under you!");
                                pline("You don't fall in!");
                                break;
                        }
                        pline("You fall into a pit!");
                        u.utrap = rn1(6,2);
                        u.utraptype = TT_PIT;
                        losehp(rnd(6),"fall into a pit");
                        selftouch("Falling, you");
                        break;
                default:
                        impossible("You hit a trap of type %u", trap->ttyp);
                }
        }
}

int
mintrap(struct monst *mtmp)
{
        struct trap *trap = t_at(mtmp->mx, mtmp->my);
        int wasintrap = mtmp->mtrapped;

        if(!trap) {
                mtmp->mtrapped = 0;     /* perhaps teleported? */
        } else if(wasintrap) {
                if(!rn2(40)) mtmp->mtrapped = 0;
        } else {
            int tt = trap->ttyp;
            int in_sight = cansee(mtmp->mx,mtmp->my);
            extern char mlarge[];

            if(mtmp->mtrapseen & (1 << tt)) {
                /* he has been in such a trap - perhaps he escapes */
                if(rn2(4)) return(0);
            }
            mtmp->mtrapseen |= (1 << tt);
            switch (tt) {
                case BEAR_TRAP:
                        if(strchr(mlarge, mtmp->data->mlet)) {
                                if(in_sight)
                                  pline("%s is caught in a bear trap!",
                                        Monnam(mtmp));
                                else
                                  if(mtmp->data->mlet == 'o')
                            pline("You hear the roaring of an angry bear!");
                                mtmp->mtrapped = 1;
                        }
                        break;
                case PIT:
                        /* there should be a mtmp/data -> floating */
                        if(!strchr("EywBfk'& ", mtmp->data->mlet)) { /* ab */
                                mtmp->mtrapped = 1;
                                if(in_sight)
                                  pline("%s falls in a pit!", Monnam(mtmp));
                        }
                        break;
                case SLP_GAS_TRAP:
                        if(!mtmp->msleep && !mtmp->mfroz) {
                                mtmp->msleep = 1;
                                if(in_sight)
                                  pline("%s suddenly falls asleep!",
                                        Monnam(mtmp));
                        }
                        break;
                case TELEP_TRAP:
                        rloc(mtmp);
                        if(in_sight && !cansee(mtmp->mx,mtmp->my))
                                pline("%s suddenly disappears!",
                                        Monnam(mtmp));
                        break;
                case ARROW_TRAP:
                        if(in_sight) {
                                pline("%s is hit by an arrow!",
                                        Monnam(mtmp));
                        }
                        mtmp->mhp -= 3;
                        break;
                case DART_TRAP:
                        if(in_sight) {
                                pline("%s is hit by a dart!",
                                        Monnam(mtmp));
                        }
                        mtmp->mhp -= 2;
                        /* not mondied here !! */
                        break;
                case TRAPDOOR:
                        if(!xdnstair) {
                                mtmp->mhp -= 10;
                                if(in_sight)
pline("A trap door in the ceiling opens and a rock hits %s!", monnam(mtmp));
                                break;
                        }
                        if(mtmp->data->mlet != 'w'){
                                fall_down(mtmp);
                                if(in_sight)
                pline("Suddenly, %s disappears out of sight.", monnam(mtmp));
                                return(2);      /* no longer on this level */
                        }
                        break;
                case PIERC:
                        break;
                default:
                        impossible("Some monster encountered a strange trap.");
            }
        }
        return(mtmp->mtrapped);
}

void
selftouch(char *arg)
{
        if(uwep && uwep->otyp == DEAD_COCKATRICE){
                pline("%s touch the dead cockatrice.", arg);
                pline("You turn to stone.");
                killer = objects[uwep->otyp].oc_name;
                done("died");
        }
}

void
float_up(void)
{
        if(u.utrap) {
                if(u.utraptype == TT_PIT) {
                        u.utrap = 0;
                        pline("You float up, out of the pit!");
                } else {
                        pline("You float up, only your leg is still stuck.");
                }
        } else
                pline("You start to float in the air!");
}

int
float_down(void)
{
        struct trap *trap;

        pline("You float gently to the ground.");
        if ((trap = t_at(u.ux,u.uy)))
                switch(trap->ttyp) {
                case PIERC:
                        break;
                case TRAPDOOR:
                        if(!xdnstair || u.ustuck) break;
                        /* fall into next case */
                default:
                        dotrap(trap);
        }
        pickup(1);
        return(0);      /* XXX value needed in hack.potion.c */
}

static void
vtele(void)
{
        struct mkroom *croom;

        for(croom = &rooms[0]; croom->hx >= 0; croom++)
            if(croom->rtype == VAULT) {
                int x,y;

                x = rn2(2) ? croom->lx : croom->hx;
                y = rn2(2) ? croom->ly : croom->hy;
                if(teleok(x,y)) {
                    teleds(x,y);
                    return;
                }
            }
        tele();
}

void
tele(void)
{
        coord cc;
        int nux,nuy;

        if(Teleport_control) {
                pline("To what position do you want to be teleported?");
                cc = getpos(1, "the desired position"); /* 1: force valid */
                /* possible extensions: introduce a small error if
                   magic power is low; allow transfer to solid rock */
                if(teleok(cc.x, cc.y)){
                        teleds(cc.x, cc.y);
                        return;
                }
                pline("Sorry ...");
        }
        do {
                nux = rnd(COLNO-1);
                nuy = rn2(ROWNO);
        } while(!teleok(nux, nuy));
        teleds(nux, nuy);
}

static void
teleds(int nux, int nuy)
{
        if(Punished) unplacebc();
        unsee();
        u.utrap = 0;
        u.ustuck = 0;
        u.ux = nux;
        u.uy = nuy;
        setsee();
        if(Punished) placebc(1);
        if(u.uswallow){
                u.uswldtim = u.uswallow = 0;
                docrt();
        }
        nomul(0);
        if(levl[nux][nuy].typ == POOL && !Levitation)
                drown();
        (void) inshop();
        pickup(1);
        if(!Blind) read_engr_at(u.ux,u.uy);
}

static int
teleok(int x, int y)
{       /* might throw him into a POOL */
        return( isok(x,y) && !IS_ROCK(levl[x][y].typ) && !m_at(x,y) &&
                !sobj_at(ENORMOUS_ROCK,x,y) && !t_at(x,y)
        );
        /* Note: gold is permitted (because of vaults) */
}

int
dotele(void)
{
        extern char pl_character[];

        if(
#ifdef WIZARD
           !wizard &&
#endif /* WIZARD */
                      (!Teleportation || u.ulevel < 6 ||
                        (pl_character[0] != 'W' && u.ulevel < 10))) {
                pline("You are not able to teleport at will.");
                return(0);
        }
        if(u.uhunger <= 100 || u.ustr < 6) {
                pline("You miss the strength for a teleport spell.");
                return(1);
        }
        tele();
        morehungry(100);
        return(1);
}

void
placebc(int attach)
{
        if(!uchain || !uball){
                impossible("Where are your chain and ball??");
                return;
        }
        uball->ox = uchain->ox = u.ux;
        uball->oy = uchain->oy = u.uy;
        if(attach){
                uchain->nobj = fobj;
                fobj = uchain;
                if(!carried(uball)){
                        uball->nobj = fobj;
                        fobj = uball;
                }
        }
}

void
unplacebc(void)
{
        if(!carried(uball)){
                freeobj(uball);
                unpobj(uball);
        }
        freeobj(uchain);
        unpobj(uchain);
}

void
level_tele(void)
{
        int newlevel;

        if(Teleport_control) {
            char buf[BUFSZ];

            do {
              pline("To what level do you want to teleport? [type a number] ");
              getlin(buf);
            } while(!isdigit((unsigned char)buf[0]) &&
                (buf[0] != '-' || !isdigit((unsigned char)buf[1])));
            newlevel = atoi(buf);
        } else {
            newlevel  = 5 + rn2(20);    /* 5 - 24 */
            if(dlevel == newlevel) {
                if(!xdnstair)
                        newlevel--;
                else
                        newlevel++;
            }
        }
        if(newlevel >= 30) {
            if(newlevel > MAXLEVEL) newlevel = MAXLEVEL;
            pline("You arrive at the center of the earth ...");
            pline("Unfortunately it is here that hell is located.");
            if(Fire_resistance) {
                pline("But the fire doesn't seem to harm you.");
            } else {
                pline("You burn to a crisp.");
                dlevel = maxdlevel = newlevel;
                killer = "visit to the hell";
                done("burned");
            }
        }
        if(newlevel < 0) {
            newlevel = 0;
            pline("You are now high above the clouds ...");
            if(Levitation) {
                pline("You float gently down to earth.");
                done("escaped");
            }
            pline("Unfortunately, you don't know how to fly.");
            pline("You fall down a few thousand feet and break your neck.");
            dlevel = 0;
            killer = "fall";
            done("died");
        }

        goto_level(newlevel, FALSE); /* calls done("escaped") if newlevel==0 */
}

void
drown(void)
{
        pline("You fall into a pool!");
        pline("You can't swim!");
        if(rn2(3) < u.uluck+2) {
                /* most scrolls become unreadable */
                struct obj *obj;

                for(obj = invent; obj; obj = obj->nobj)
                        if(obj->olet == SCROLL_SYM && rn2(12) > u.uluck)
                                obj->otyp = SCR_BLANK_PAPER;
                /* we should perhaps merge these scrolls ? */

                pline("You attempt a teleport spell."); /* utcsri!carroll */
                (void) dotele();
                if(levl[(int)u.ux][(int)u.uy].typ != POOL)
                        return;
        }
        pline("You drown ...");
        killer = "pool of water";
        done("drowned");
}