/*      $OpenBSD: hack.engrave.c,v 1.9 2016/01/09 21:54:11 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 char *nomovemsg;
extern char nul[];
extern struct obj zeroobj;
struct engr {
        struct engr *nxt_engr;
        char *engr_txt;
        xchar engr_x, engr_y;
        unsigned engr_lth;      /* for save & restore; not length of text */
        long engr_time; /* moment engraving was (will be) finished */
        xchar engr_type;
#define DUST    1
#define ENGRAVE 2
#define BURN    3
} *head_engr;

static void del_engr(struct engr *);

struct engr *
engr_at(xchar x, xchar y)
{
        struct engr *ep = head_engr;

        while(ep) {
                if(x == ep->engr_x && y == ep->engr_y)
                        return(ep);
                ep = ep->nxt_engr;
        }
        return((struct engr *) 0);
}

int
sengr_at(char *s, xchar x, xchar y)
{
        struct engr *ep = engr_at(x,y);
        char *t;
        int n;

        if(ep && ep->engr_time <= moves) {
                t = ep->engr_txt;
/*
                if(!strcmp(s,t)) return(1);
*/
                n = strlen(s);
                while(*t) {
                        if(!strncmp(s,t,n)) return(1);
                        t++;
                }
        }
        return(0);
}

void
u_wipe_engr(int cnt)
{
        if(!u.uswallow && !Levitation)
                wipe_engr_at(u.ux, u.uy, cnt);
}

void
wipe_engr_at(xchar x, xchar y, xchar cnt)
{
        struct engr *ep = engr_at(x,y);
        int lth,pos;
        char ch;

        if(ep){
                if((ep->engr_type != DUST) || Levitation) {
                        cnt = rn2(1 + 50/(cnt+1)) ? 0 : 1;
                }
                lth = strlen(ep->engr_txt);
                if(lth && cnt > 0 ) {
                        while(cnt--) {
                                pos = rn2(lth);
                                if((ch = ep->engr_txt[pos]) == ' ')
                                        continue;
                                ep->engr_txt[pos] = (ch != '?') ? '?' : ' ';
                        }
                }
                while(lth && ep->engr_txt[lth-1] == ' ')
                        ep->engr_txt[--lth] = 0;
                while(ep->engr_txt[0] == ' ')
                        ep->engr_txt++;
                if(!ep->engr_txt[0]) del_engr(ep);
        }
}

void
read_engr_at(int x, int y)
{
        struct engr *ep = engr_at(x,y);

        if(ep && ep->engr_txt[0]) {
            switch(ep->engr_type) {
            case DUST:
                pline("Something is written here in the dust.");
                break;
            case ENGRAVE:
                pline("Something is engraved here on the floor.");
                break;
            case BURN:
                pline("Some text has been burned here in the floor.");
                break;
            default:
                impossible("Something is written in a very strange way.");
            }
            pline("You read: \"%s\".", ep->engr_txt);
        }
}

void
make_engr_at(int x, int y, char *s)
{
        struct engr *ep;
        size_t len = strlen(s) + 1;

        if ((ep = engr_at(x,y)))
            del_engr(ep);
        ep = (struct engr *)
            alloc((unsigned)(sizeof(struct engr) + len));
        ep->nxt_engr = head_engr;
        head_engr = ep;
        ep->engr_x = x;
        ep->engr_y = y;
        ep->engr_txt = (char *)(ep + 1);
        (void) strlcpy(ep->engr_txt, s, len);
        ep->engr_time = 0;
        ep->engr_type = DUST;
        ep->engr_lth = len;
}

int
doengrave(void)
{
        int len;
        char *sp;
        struct engr *ep, *oep = engr_at(u.ux,u.uy);
        char buf[BUFSZ];
        xchar type;
        int spct;               /* number of leading spaces */
        struct obj *otmp;

        multi = 0;

        if(u.uswallow) {
                pline("You're joking. Hahaha!");        /* riv05!a3 */
                return(0);
        }

        /* one may write with finger, weapon or wand */
        otmp = getobj("#-)/", "write with");
        if(!otmp) return(0);

        if(otmp == &zeroobj)
                otmp = 0;
        if(otmp && otmp->otyp == WAN_FIRE && otmp->spe) {
                type = BURN;
                otmp->spe--;
        } else {
                /* first wield otmp */
                if(otmp != uwep) {
                        if(uwep && uwep->cursed) {
                            /* Andreas Bormann */
                            pline("Since your weapon is welded to your hand,");
                            pline("you use the %s.", aobjnam(uwep, NULL));
                            otmp = uwep;
                        } else {
                            if(!otmp)
                                pline("You are now empty-handed.");
                            else if(otmp->cursed)
                                pline("The %s %s to your hand!",
                                    aobjnam(otmp, "weld"),
                                    (otmp->quan == 1) ? "itself" : "themselves");
                            else
                                pline("You now wield %s.", doname(otmp));
                            setuwep(otmp);
                        }
                }

                if(!otmp)
                        type = DUST;
                else
                if(otmp->otyp == DAGGER || otmp->otyp == TWO_HANDED_SWORD ||
                otmp->otyp == CRYSKNIFE ||
                otmp->otyp == LONG_SWORD || otmp->otyp == AXE) {
                        type = ENGRAVE;
                        if((int)otmp->spe <= -3) {
                                type = DUST;
                                pline("Your %s too dull for engraving.",
                                        aobjnam(otmp, "are"));
                                if(oep && oep->engr_type != DUST) return(1);
                        }
                } else  type = DUST;
        }
        if(Levitation && type != BURN){         /* riv05!a3 */
                pline("You can't reach the floor!");
                return(1);
        }
        if(oep && oep->engr_type == DUST){
                  pline("You wipe out the message that was written here.");
                  del_engr(oep);
                  oep = 0;
        }
        if(type == DUST && oep){
        pline("You cannot wipe out the message that is %s in the rock.",
                    (oep->engr_type == BURN) ? "burned" : "engraved");
                  return(1);
        }

        pline("What do you want to %s on the floor here? ",
          (type == ENGRAVE) ? "engrave" : (type == BURN) ? "burn" : "write");
        getlin(buf);
        clrlin();
        spct = 0;
        sp = buf;
        while(*sp == ' ') spct++, sp++;
        len = strlen(sp);
        if(!len || *buf == '\033') {
                if(type == BURN) otmp->spe++;
                return(0);
        }
        
        switch(type) {
        case DUST:
        case BURN:
                if(len > 15) {
                        multi = -(len/10);
                        nomovemsg = "You finished writing.";
                }
                break;
        case ENGRAVE:           /* here otmp != 0 */
                {       int len2 = (otmp->spe + 3) * 2 + 1;

                        pline("Your %s dull.", aobjnam(otmp, "get"));
                        if(len2 < len) {
                                len = len2;
                                sp[len] = 0;
                                otmp->spe = -3;
                                nomovemsg = "You cannot engrave more.";
                        } else {
                                otmp->spe -= len/2;
                                nomovemsg = "You finished engraving.";
                        }
                        multi = -len;
                }
                break;
        }
        if(oep) len += strlen(oep->engr_txt) + spct;
        ep = (struct engr *) alloc((unsigned)(sizeof(struct engr) + len + 1));
        ep->nxt_engr = head_engr;
        head_engr = ep;
        ep->engr_x = u.ux;
        ep->engr_y = u.uy;
        sp = (char *)(ep + 1);  /* (char *)ep + sizeof(struct engr) */
        ep->engr_txt = sp;
        if(oep) {
                (void) strlcpy(sp, oep->engr_txt, len + 1);
                (void) strlcat(sp, buf, len + 1);
                del_engr(oep);
        } else
                (void) strlcpy(sp, buf, len + 1);
        ep->engr_lth = len+1;
        ep->engr_type = type;
        ep->engr_time = moves-multi;

        /* kludge to protect pline against excessively long texts */
        if(len > BUFSZ-20) sp[BUFSZ-20] = 0;

        return(1);
}

void
save_engravings(int fd)
{
        struct engr *ep = head_engr;

        while(ep) {
                if(!ep->engr_lth || !ep->engr_txt[0]){
                        ep = ep->nxt_engr;
                        continue;
                }
                bwrite(fd,  &(ep->engr_lth), sizeof(ep->engr_lth));
                bwrite(fd, ep, sizeof(struct engr) + ep->engr_lth);
                ep = ep->nxt_engr;
        }
        bwrite(fd, nul, sizeof(unsigned));
        head_engr = 0;
}

void
rest_engravings(int fd)
{
        struct engr *ep;
        unsigned lth;

        head_engr = 0;
        while(1) {
                mread(fd, (char *) &lth, sizeof(unsigned));
                if(lth == 0) return;
                ep = (struct engr *) alloc(sizeof(struct engr) + lth);
                mread(fd, (char *) ep, sizeof(struct engr) + lth);
                ep->nxt_engr = head_engr;
                ep->engr_txt = (char *) (ep + 1);       /* Andreas Bormann */
                head_engr = ep;
        }
}

static void
del_engr(struct engr *ep)
{
        struct engr *ept;

        if(ep == head_engr)
                head_engr = ep->nxt_engr;
        else {
                for(ept = head_engr; ept; ept = ept->nxt_engr) {
                        if(ept->nxt_engr == ep) {
                                ept->nxt_engr = ep->nxt_engr;
                                goto fnd;
                        }
                }
                impossible("Error in del_engr?");
                return;
        fnd:    ;
        }
        free(ep);
}