/*      $NetBSD: hack.engrave.c,v 1.14 2011/08/07 06:03:45 dholland 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: hack.engrave.c,v 1.14 2011/08/07 06:03:45 dholland Exp $");
#endif                          /* not lint */

#include <stdlib.h>
#include "hack.h"
#include "extern.h"

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
};

static struct engr *head_engr;

static void del_engr(struct engr *);

static 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(const char *s, xchar x, xchar y)
{
        struct engr    *ep = engr_at(x, y);
        char           *t;
        size_t 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             pos;
        char            ch;
        size_t lth;

        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, const char *s)
{
        struct engr    *ep;

        if ((ep = engr_at(x, y)) != NULL)
                del_engr(ep);
        ep = alloc(sizeof(*ep) + strlen(s) + 1);

        ep->nxt_engr = head_engr;
        head_engr = ep;
        ep->engr_x = x;
        ep->engr_y = y;
        ep->engr_txt = (char *) (ep + 1);
        (void) strcpy(ep->engr_txt, s);
        ep->engr_time = 0;
        ep->engr_type = DUST;
        ep->engr_lth = strlen(s) + 1;
}

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 = alloc(sizeof(*ep) + 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) strcpy(sp, oep->engr_txt);
                (void) strcat(sp, buf);
                del_engr(oep);
        } else
                (void) strcpy(sp, buf);
        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, &lth, sizeof(unsigned));
                if (lth == 0)
                        return;
                ep = alloc(sizeof(*ep) + lth);
                mread(fd, ep, sizeof(*ep) + 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);
}