/*      $OpenBSD: hack.zap.c,v 1.11 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 <stdlib.h>

#include "hack.h"

extern struct monst youmonst;

char *fl[]= {
        "magic missile",
        "bolt of fire",
        "sleep ray",
        "bolt of cold",
        "death ray"
};

static char dirlet(int, int);
static int  zhit(struct monst *, int);
static boolean revive(struct obj *);
static void rloco(struct obj *);
static void burn_scrolls(void);

/* Routines for IMMEDIATE wands. */
/* bhitm: monster mtmp was hit by the effect of wand otmp */
void
bhitm(struct monst *mtmp, struct obj *otmp)
{
        wakeup(mtmp);
        switch(otmp->otyp) {
        case WAN_STRIKING:
                if(u.uswallow || rnd(20) < 10+mtmp->data->ac) {
                        int tmp = d(2,12);
                        hit("wand", mtmp, exclam(tmp));
                        mtmp->mhp -= tmp;
                        if(mtmp->mhp < 1) killed(mtmp);
                } else miss("wand", mtmp);
                break;
        case WAN_SLOW_MONSTER:
                mtmp->mspeed = MSLOW;
                break;
        case WAN_SPEED_MONSTER:
                mtmp->mspeed = MFAST;
                break;
        case WAN_UNDEAD_TURNING:
                if(strchr(UNDEAD,mtmp->data->mlet)) {
                        mtmp->mhp -= rnd(8);
                        if(mtmp->mhp < 1) killed(mtmp);
                        else mtmp->mflee = 1;
                }
                break;
        case WAN_POLYMORPH:
                if( newcham(mtmp,&mons[rn2(CMNUM)]) )
                        objects[otmp->otyp].oc_name_known = 1;
                break;
        case WAN_CANCELLATION:
                mtmp->mcan = 1;
                break;
        case WAN_TELEPORTATION:
                rloc(mtmp);
                break;
        case WAN_MAKE_INVISIBLE:
                mtmp->minvis = 1;
                break;
#ifdef WAN_PROBING
        case WAN_PROBING:
                mstatusline(mtmp);
                break;
#endif /* WAN_PROBING */
        default:
                impossible("What an interesting wand (%u)", otmp->otyp);
        }
}

/* returns TRUE if sth was done */
/* object obj was hit by the effect of wand otmp */
boolean
bhito(struct obj *obj, struct obj *otmp)
{
        int res = TRUE;

        if(obj == uball || obj == uchain)
                res = FALSE;
        else
        switch(otmp->otyp) {
        case WAN_POLYMORPH:
                /* preserve symbol and quantity, but turn rocks into gems */
                mkobj_at((obj->otyp == ROCK || obj->otyp == ENORMOUS_ROCK)
                        ? GEM_SYM : obj->olet,
                        obj->ox, obj->oy) -> quan = obj->quan;
                delobj(obj);
                break;
        case WAN_STRIKING:
                if(obj->otyp == ENORMOUS_ROCK)
                        fracture_rock(obj);
                else
                        res = FALSE;
                break;
        case WAN_CANCELLATION:
                if(obj->spe && obj->olet != AMULET_SYM) {
                        obj->known = 0;
                        obj->spe = 0;
                }
                break;
        case WAN_TELEPORTATION:
                rloco(obj);
                break;
        case WAN_MAKE_INVISIBLE:
                obj->oinvis = 1;
                break;
        case WAN_UNDEAD_TURNING:
                res = revive(obj);
                break;
        case WAN_SLOW_MONSTER:          /* no effect on objects */
        case WAN_SPEED_MONSTER:
#ifdef WAN_PROBING
        case WAN_PROBING:
#endif /* WAN_PROBING */
                res = FALSE;
                break;
        default:
                impossible("What an interesting wand (%u)", otmp->otyp);
        }
        return(res);
}

int
dozap(void)
{
        struct obj *obj;
        xchar zx,zy;

        obj = getobj("/", "zap");
        if(!obj) return(0);
        if(obj->spe < 0 || (obj->spe == 0 && rn2(121))) {
                pline("Nothing Happens.");
                return(1);
        }
        if(obj->spe == 0)
                pline("You wrest one more spell from the worn-out wand.");
        if(!(objects[obj->otyp].bits & NODIR) && !getdir(1))
                return(1);      /* make him pay for knowing !NODIR */
        obj->spe--;
        if(objects[obj->otyp].bits & IMMEDIATE) {
                if(u.uswallow)
                        bhitm(u.ustuck, obj);
                else if(u.dz) {
                        if(u.dz > 0) {
                                struct obj *otmp = o_at(u.ux, u.uy);
                                if(otmp)
                                        (void) bhito(otmp, obj);
                        }
                } else
                        (void) bhit(u.dx,u.dy,rn1(8,6),0,bhitm,bhito,obj);
        } else {
            switch(obj->otyp){
                case WAN_LIGHT:
                        litroom(TRUE);
                        break;
                case WAN_SECRET_DOOR_DETECTION:
                        if(!findit()) return(1);
                        break;
                case WAN_CREATE_MONSTER:
                        { int cnt = 1;
                        if(!rn2(23)) cnt += rn2(7) + 1;
                        while(cnt--)
                            (void) makemon((struct permonst *) 0, u.ux, u.uy);
                        }
                        break;
                case WAN_WISHING:
                        { char buf[BUFSZ];
                          struct obj *otmp;
                      if(u.uluck + rn2(5) < 0) {
                        pline("Unfortunately, nothing happens.");
                        break;
                      }
                      pline("You may wish for an object. What do you want? ");
                      getlin(buf);
                      if(buf[0] == '\033') buf[0] = 0;
                      otmp = readobjnam(buf, sizeof buf);
                      otmp = addinv(otmp);
                      prinv(otmp);
                      break;
                        }
                case WAN_DIGGING:
                        /* Original effect (approximately):
                         * from CORR: dig until we pierce a wall
                         * from ROOM: piece wall and dig until we reach
                         * an ACCESSIBLE place.
                         * Currently: dig for digdepth positions;
                         * also down on request of Lennart Augustsson.
                         */
                        { struct rm *room;
                          int digdepth;
                        if(u.uswallow) {
                                struct monst *mtmp = u.ustuck;

                                pline("You pierce %s's stomach wall!",
                                        monnam(mtmp));
                                mtmp->mhp = 1;  /* almost dead */
                                unstuck(mtmp);
                                mnexto(mtmp);
                                break;
                        }
                        if(u.dz) {
                            if(u.dz < 0) {
                                pline("You loosen a rock from the ceiling.");
                                pline("It falls on your head!");
                                losehp(1, "falling rock");
                                mksobj_at(ROCK, u.ux, u.uy);
                                fobj->quan = 1;
                                stackobj(fobj);
                                if(Invisible) newsym(u.ux, u.uy);
                            } else {
                                dighole();
                            }
                            break;
                        }
                        zx = u.ux+u.dx;
                        zy = u.uy+u.dy;
                        digdepth = 8 + rn2(18);
                        Tmp_at(-1, '*');        /* open call */
                        while(--digdepth >= 0) {
                                if(!isok(zx,zy)) break;
                                room = &levl[(int)zx][(int)zy];
                                Tmp_at(zx,zy);
                                if(!xdnstair){
                                        if(zx < 3 || zx > COLNO-3 ||
                                            zy < 3 || zy > ROWNO-3)
                                                break;
                                        if(room->typ == HWALL ||
                                            room->typ == VWALL){
                                                room->typ = ROOM;
                                                break;
                                        }
                                } else
                                if(room->typ == HWALL || room->typ == VWALL ||
                                   room->typ == SDOOR || room->typ == LDOOR){
                                        room->typ = DOOR;
                                        digdepth -= 2;
                                } else
                                if(room->typ == SCORR || !room->typ) {
                                        room->typ = CORR;
                                        digdepth--;
                                }
                                mnewsym(zx,zy);
                                zx += u.dx;
                                zy += u.dy;
                        }
                        mnewsym(zx,zy); /* not always necessary */
                        Tmp_at(-1,-1);  /* closing call */
                        break;
                        }
                default:
                        buzz((int) obj->otyp - WAN_MAGIC_MISSILE,
                                u.ux, u.uy, u.dx, u.dy);
                        break;
                }
                if(!objects[obj->otyp].oc_name_known) {
                        objects[obj->otyp].oc_name_known = 1;
                        more_experienced(0,10);
                }
        }
        return(1);
}

char *
exclam(int force)
{
        /* force == 0 occurs e.g. with sleep ray */
        /* note that large force is usual with wands so that !! would
         *      require information about hand/weapon/wand
         */
        return( (force < 0) ? "?" : (force <= 4) ? "." : "!" );
}

/* force is usually either "." or "!" */
void
hit(char *str, struct monst *mtmp, char *force)
{
        if(!cansee(mtmp->mx,mtmp->my)) pline("The %s hits it.", str);
        else pline("The %s hits %s%s", str, monnam(mtmp), force);
}

void
miss(char *str, struct monst *mtmp)
{
        if(!cansee(mtmp->mx,mtmp->my)) pline("The %s misses it.",str);
        else pline("The %s misses %s.",str,monnam(mtmp));
}

/* bhit: called when a weapon is thrown (sym = obj->olet) or when an
 * IMMEDIATE wand is zapped (sym = 0); the weapon falls down at end of
 * range or when a monster is hit; the monster is returned, and bhitpos
 * is set to the final position of the weapon thrown; the ray of a wand
 * may affect several objects and monsters on its path - for each of
 * these an argument function is called. */
/* check !u.uswallow before calling bhit() */

/*
 * int ddx,ddy,range;           direction and range
 * char sym;                            symbol displayed on path
 * int (*fhitm)(), (*fhito)();          fns called when mon/obj hit
 * struct obj *obj;                     2nd arg to fhitm/fhito
 * struct monst *
 */
struct monst *
bhit(int ddx, int ddy, int range, char sym,
    void (*fhitm)(struct monst *, struct obj *),
    boolean (*fhito)(struct obj *, struct obj *),
    struct obj *obj)
{
        struct monst *mtmp;
        struct obj *otmp;
        int typ;

        bhitpos.x = u.ux;
        bhitpos.y = u.uy;

        if(sym) tmp_at(-1, sym);        /* open call */
        while(range-- > 0) {
                bhitpos.x += ddx;
                bhitpos.y += ddy;
                typ = levl[(int)bhitpos.x][(int)bhitpos.y].typ;
                if ((mtmp = m_at(bhitpos.x,bhitpos.y))) {
                        if(sym) {
                                tmp_at(-1, -1); /* close call */
                                return(mtmp);
                        }
                        if (fhitm)
                                (*fhitm)(mtmp, obj);
                        range -= 3;
                }
                if ((otmp = o_at(bhitpos.x,bhitpos.y))){
                        if(fhito && (*fhito)(otmp, obj))
                                range--;
                }
                if (!ZAP_POS(typ)) {
                        bhitpos.x -= ddx;
                        bhitpos.y -= ddy;
                        break;
                }
                if(sym) tmp_at(bhitpos.x, bhitpos.y);
        }

        /* leave last symbol unless in a pool */
        if(sym)
           tmp_at(-1, (levl[(int)bhitpos.x][(int)bhitpos.y].typ == POOL) ? -1 : 0);
        return(NULL);
}

struct monst *
boomhit(int dx, int dy)
{
        int i, ct;
        struct monst *mtmp;
        char sym = ')';
        extern schar xdir[], ydir[];

        bhitpos.x = u.ux;
        bhitpos.y = u.uy;

        for(i=0; i<8; i++) if(xdir[i] == dx && ydir[i] == dy) break;
        tmp_at(-1, sym);        /* open call */
        for(ct=0; ct<10; ct++) {
                if(i == 8) i = 0;
                sym = ')' + '(' - sym;
                tmp_at(-2, sym);        /* change let call */
                dx = xdir[i];
                dy = ydir[i];
                bhitpos.x += dx;
                bhitpos.y += dy;
                if ((mtmp = m_at(bhitpos.x, bhitpos.y))) {
                        tmp_at(-1,-1);
                        return(mtmp);
                }
                if (!ZAP_POS(levl[(int)bhitpos.x][(int)bhitpos.y].typ)) {
                        bhitpos.x -= dx;
                        bhitpos.y -= dy;
                        break;
                }
                if (bhitpos.x == u.ux && bhitpos.y == u.uy) { /* ct == 9 */
                        if(rn2(20) >= 10+u.ulevel){     /* we hit ourselves */
                                (void) thitu(10, rnd(10), "boomerang");
                                break;
                        } else {        /* we catch it */
                                tmp_at(-1,-1);
                                pline("Skillfully, you catch the boomerang.");
                                return(&youmonst);
                        }
                }
                tmp_at(bhitpos.x, bhitpos.y);
                if(ct % 5 != 0) i++;
        }
        tmp_at(-1, -1); /* do not leave last symbol */
        return(0);
}

static char
dirlet(int dx, int dy)
{
        return (dx == dy) ? '\\' : (dx && dy) ? '/' : dx ? '-' : '|';
}

/* type == -1: monster spitting fire at you */
/* type == -1,-2,-3: bolts sent out by wizard */
/* called with dx = dy = 0 with vertical bolts */
void
buzz(int type, xchar sx, xchar sy, int dx, int dy)
{
        int abstype = abs(type);
        char *fltxt = (type == -1) ? "blaze of fire" : fl[abstype];
        struct rm *lev;
        xchar range;
        struct monst *mon;

        if(u.uswallow) {
                int tmp;

                if(type < 0) return;
                tmp = zhit(u.ustuck, type);
                pline("The %s rips into %s%s",
                        fltxt, monnam(u.ustuck), exclam(tmp));
                return;
        }
        if(type < 0) pru();
        range = rn1(7,7);
        Tmp_at(-1, dirlet(dx,dy));      /* open call */
        while(range-- > 0) {
                sx += dx;
                sy += dy;
                if ((lev = &levl[(int)sx][(int)sy])->typ)
                        Tmp_at(sx,sy);
                else {
                        int bounce = 0;
                        if (cansee(sx-dx,sy-dy))
                                pline("The %s bounces!", fltxt);
                        if (ZAP_POS(levl[(int)sx][sy-dy].typ))
                                bounce = 1;
                        if (ZAP_POS(levl[sx-dx][(int)sy].typ)) {
                                if(!bounce || rn2(2))
                                        bounce = 2;
                        }
                        switch(bounce){
                        case 0:
                                dx = -dx;
                                dy = -dy;
                                continue;
                        case 1:
                                dy = -dy;
                                sx -= dx;
                                break;
                        case 2:
                                dx = -dx;
                                sy -= dy;
                                break;
                        }
                        Tmp_at(-2,dirlet(dx,dy));
                        continue;
                }
                if(lev->typ == POOL && abstype == 1 /* fire */) {
                        range -= 3;
                        lev->typ = ROOM;
                        if(cansee(sx,sy)) {
                                mnewsym(sx,sy);
                                pline("The water evaporates.");
                        } else
                                pline("You hear a hissing sound.");
                }
                if((mon = m_at(sx,sy)) &&
                   (type != -1 || mon->data->mlet != 'D')) {
                        wakeup(mon);
                        if(rnd(20) < 18 + mon->data->ac) {
                                int tmp = zhit(mon,abstype);
                                if(mon->mhp < 1) {
                                        if(type < 0) {
                                            if(cansee(mon->mx,mon->my))
                                              pline("%s is killed by the %s!",
                                                Monnam(mon), fltxt);
                                            mondied(mon);
                                        } else
                                            killed(mon);
                                } else
                                        hit(fltxt, mon, exclam(tmp));
                                range -= 2;
                        } else
                                miss(fltxt,mon);
                } else if(sx == u.ux && sy == u.uy) {
                        nomul(0);
                        if(rnd(20) < 18+u.uac) {
                                int dam = 0;
                                range -= 2;
                                pline("The %s hits you!",fltxt);
                                switch(abstype) {
                                case 0:
                                        dam = d(2,6);
                                        break;
                                case 1:
                                        if(Fire_resistance)
                                                pline("You don't feel hot!");
                                        else dam = d(6,6);
                                        if(!rn2(3))
                                                burn_scrolls();
                                        break;
                                case 2:
                                        nomul(-rnd(25)); /* sleep ray */
                                        break;
                                case 3:
                                        if(Cold_resistance)
                                                pline("You don't feel cold!");
                                        else dam = d(6,6);
                                        break;
                                case 4:
                                        u.uhp = -1;
                                }
                                losehp(dam,fltxt);
                        } else pline("The %s whizzes by you!",fltxt);
                        stop_occupation();
                }
                if(!ZAP_POS(lev->typ)) {
                        int bounce = 0, rmn;
                        if(cansee(sx,sy)) pline("The %s bounces!",fltxt);
                        range--;
                        if(!dx || !dy || !rn2(20)){
                                dx = -dx;
                                dy = -dy;
                        } else {
                          if(ZAP_POS(rmn = levl[(int)sx][sy-dy].typ) &&
                            (IS_ROOM(rmn) || ZAP_POS(levl[sx+dx][sy-dy].typ)))
                                bounce = 1;
                          if(ZAP_POS(rmn = levl[sx-dx][(int)sy].typ) &&
                            (IS_ROOM(rmn) || ZAP_POS(levl[sx-dx][sy+dy].typ)))
                                if(!bounce || rn2(2))
                                        bounce = 2;

                          switch(bounce){
                          case 0:
                                dy = -dy;
                                dx = -dx;
                                break;
                          case 1:
                                dy = -dy;
                                break;
                          case 2:
                                dx = -dx;
                                break;
                          }
                          Tmp_at(-2, dirlet(dx,dy));
                        }
                }
        }
        Tmp_at(-1,-1);
}

/* returns damage to mon */
static int
zhit(struct monst *mon, int type)
{
        int tmp = 0;

        switch(type) {
        case 0:                 /* magic missile */
                tmp = d(2,6);
                break;
        case -1:                /* Dragon blazing fire */
        case 1:                 /* fire */
                if(strchr("Dg", mon->data->mlet)) break;
                tmp = d(6,6);
                if(strchr("YF", mon->data->mlet)) tmp += 7;
                break;
        case 2:                 /* sleep*/
                mon->mfroz = 1;
                break;
        case 3:                 /* cold */
                if(strchr("YFgf", mon->data->mlet)) break;
                tmp = d(6,6);
                if(mon->data->mlet == 'D') tmp += 7;
                break;
        case 4:                 /* death*/
                if(strchr(UNDEAD, mon->data->mlet)) break;
                tmp = mon->mhp+1;
                break;
        }
        mon->mhp -= tmp;
        return(tmp);
}

#define CORPSE_I_TO_C(otyp)     (char) ((otyp >= DEAD_ACID_BLOB)\
                     ?  'a' + (otyp - DEAD_ACID_BLOB)\
                     :  '@' + (otyp - DEAD_HUMAN))

static boolean
revive(struct obj *obj)
{
        struct monst *mtmp;

        if(obj->olet == FOOD_SYM && obj->otyp > CORPSE) {
                /* do not (yet) revive shopkeepers */
                /* Note: this might conceivably produce two monsters
                        at the same position - strange, but harmless */
                mtmp = mkmon_at(CORPSE_I_TO_C(obj->otyp),obj->ox,obj->oy);
                delobj(obj);
        }
        return(!!mtmp);         /* TRUE if some monster created */
}

static void
rloco(struct obj *obj)
{
        int tx,ty,otx,oty;

        otx = obj->ox;
        oty = obj->oy;
        do {
                tx = rn1(COLNO-3,2);
                ty = rn2(ROWNO);
        } while(!goodpos(tx,ty));
        obj->ox = tx;
        obj->oy = ty;
        if(cansee(otx,oty))
                newsym(otx,oty);
}

/* fractured by pick-axe or wand of striking */
void
fracture_rock(struct obj *obj)
{
        /* unpobj(obj); */
        obj->otyp = ROCK;
        obj->quan = 7 + rn2(60);
        obj->owt = weight(obj);
        obj->olet = WEAPON_SYM;
        if(cansee(obj->ox,obj->oy))
                prl(obj->ox,obj->oy);
}

static void
burn_scrolls(void)
{
        struct obj *obj, *obj2;
        int cnt = 0;

        for(obj = invent; obj; obj = obj2) {
                obj2 = obj->nobj;
                if(obj->olet == SCROLL_SYM) {
                        cnt++;
                        useup(obj);
                }
        }
        if(cnt > 1) {
                pline("Your scrolls catch fire!");
                losehp(cnt, "burning scrolls");
        } else if(cnt) {
                pline("Your scroll catches fire!");
                losehp(1, "burning scroll");
        }
}