/*	$NetBSD: hack.shk.c,v 1.14 2012/06/19 05:46:08 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.shk.c,v 1.14 2012/06/19 05:46:08 dholland Exp $");
#endif				/* not lint */

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

#ifndef QUEST
static void setpaid(void);
static void addupbill(void);
static void findshk(int);
static struct bill_x *onbill(struct obj *);
static void pay(long, struct monst *);
static int dopayobj(struct bill_x *);
static struct obj *bp_to_obj(struct bill_x *);
static int getprice(struct obj *);
static int realhunger(void);
#endif

#ifdef QUEST
int             shlevel = 0;
struct monst   *shopkeeper = 0;
struct obj     *billobjs = 0;
void
obfree(struct obj *obj, struct obj *merge)
{
	free(obj);
}
int
inshop(void) {
	return (0);
}
void
shopdig(int n)
{
}
void
addtobill(struct obj *obj)
{
}
void
subfrombill(struct obj *obj)
{
}
void
splitbill(struct obj *o1, struct obj *o2)
{
}
int
dopay(void)
{
	return (0);
}
void
paybill(void)
{
}
int
doinvbill(int n)
{
	return (0);
}
void
shkdead(struct monst *m)
{
}
int
shkcatch(struct obj *obj)
{
	return (0);
}
int
shk_move(struct monst *m)
{
	return (0);
}
void
replshk(struct monst *mtmp, struct monst *mtmp2)
{
}
char           *
shkname(struct monst *m)
{
	return ("");
}

#else	/* QUEST */
#include	"hack.mfndpos.h"
#include	"def.mkroom.h"
#include	"def.eshk.h"

#define	ESHK(mon)	((struct eshk *)(&(mon->mextra[0])))
#define	NOTANGRY(mon)	mon->mpeaceful
#define	ANGRY(mon)	!NOTANGRY(mon)

/*
 * Descriptor of current shopkeeper. Note that the bill need not be
 * per-shopkeeper, since it is valid only when in a shop.
 */
static struct monst *shopkeeper = 0;
static struct bill_x *bill;
static int      shlevel = 0;	/* level of this shopkeeper */
struct obj     *billobjs;	/* objects on bill with bp->useup */
/* only accessed here and by save & restore */
static long int total;		/* filled by addupbill() */
static long int followmsg;	/* last time of follow message */

/*
	invariants: obj->unpaid iff onbill(obj) [unless bp->useup]
		obj->quan <= bp->bquan
 */


const char shtypes[] = {	/* 8 shoptypes: 7 specialized, 1 mixed */
	RING_SYM, WAND_SYM, WEAPON_SYM, FOOD_SYM, SCROLL_SYM,
	POTION_SYM, ARMOR_SYM, 0
};

static const char    *const shopnam[] = {
	"engagement ring", "walking cane", "antique weapon",
	"delicatessen", "second hand book", "liquor",
	"used armor", "assorted antiques"
};

char           *
shkname(struct monst *mtmp)		/* called in do_name.c */
{
	return (ESHK(mtmp)->shknam);
}

void
shkdead(struct monst *mtmp)		/* called in mon.c */
{
	struct eshk    *eshk = ESHK(mtmp);

	if (eshk->shoplevel == dlevel)
		rooms[eshk->shoproom].rtype = 0;
	if (mtmp == shopkeeper) {
		setpaid();
		shopkeeper = 0;
		bill = (struct bill_x *) - 1000;	/* dump core when
							 * referenced */
	}
}

void
replshk(struct monst *mtmp, struct monst *mtmp2)
{
	if (mtmp == shopkeeper) {
		shopkeeper = mtmp2;
		bill = &(ESHK(shopkeeper)->bill[0]);
	}
}

static void
setpaid(void)
{				/* caller has checked that shopkeeper exists */
	/* either we paid or left the shop or he just died */
	struct obj     *obj;
	struct monst   *mtmp;
	for (obj = invent; obj; obj = obj->nobj)
		obj->unpaid = 0;
	for (obj = fobj; obj; obj = obj->nobj)
		obj->unpaid = 0;
	for (obj = fcobj; obj; obj = obj->nobj)
		obj->unpaid = 0;
	for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
		for (obj = mtmp->minvent; obj; obj = obj->nobj)
			obj->unpaid = 0;
	for (mtmp = fallen_down; mtmp; mtmp = mtmp->nmon)
		for (obj = mtmp->minvent; obj; obj = obj->nobj)
			obj->unpaid = 0;
	while ((obj = billobjs) != NULL) {
		billobjs = obj->nobj;
		free(obj);
	}
	ESHK(shopkeeper)->billct = 0;
}

static void
addupbill(void)
{				/* delivers result in total */
	/* caller has checked that shopkeeper exists */
	int ct = ESHK(shopkeeper)->billct;
	struct bill_x  *bp = bill;
	total = 0;
	while (ct--) {
		total += bp->price * bp->bquan;
		bp++;
	}
}

int
inshop(void)
{
	int roomno = inroom(u.ux, u.uy);

	/* Did we just leave a shop? */
	if (u.uinshop &&
	    (u.uinshop != roomno + 1 || shlevel != dlevel || !shopkeeper)) {
		if (shopkeeper) {
			if (ESHK(shopkeeper)->billct) {
				if (inroom(shopkeeper->mx, shopkeeper->my)
				    == u.uinshop - 1)	/* ab@unido */
					pline("Somehow you escaped the shop without paying!");
				addupbill();
				pline("You stole for a total worth of %ld zorkmids.",
				      total);
				ESHK(shopkeeper)->robbed += total;
				setpaid();
				if ((rooms[ESHK(shopkeeper)->shoproom].rtype == GENERAL)
				    == (rn2(3) == 0))
					ESHK(shopkeeper)->following = 1;
			}
			shopkeeper = 0;
			shlevel = 0;
		}
		u.uinshop = 0;
	}
	/* Did we just enter a zoo of some kind? */
	if (roomno >= 0) {
		int             rt = rooms[roomno].rtype;
		struct monst   *mtmp;
		if (rt == ZOO) {
			pline("Welcome to David's treasure zoo!");
		} else if (rt == SWAMP) {
			pline("It looks rather muddy down here.");
		} else if (rt == MORGUE) {
			if (midnight())
				pline("Go away! Go away!");
			else
				pline("You get an uncanny feeling ...");
		} else
			rt = 0;
		if (rt != 0) {
			rooms[roomno].rtype = 0;
			for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
				if (rt != ZOO || !rn2(3))
					mtmp->msleep = 0;
		}
	}
	/* Did we just enter a shop? */
	if (roomno >= 0 && rooms[roomno].rtype >= 8) {
		if (shlevel != dlevel || !shopkeeper
		    || ESHK(shopkeeper)->shoproom != roomno)
			findshk(roomno);
		if (!shopkeeper) {
			rooms[roomno].rtype = 0;
			u.uinshop = 0;
		} else if (!u.uinshop) {
			if (!ESHK(shopkeeper)->visitct ||
			    strncmp(ESHK(shopkeeper)->customer, plname, PL_NSIZ)) {

				/* He seems to be new here */
				ESHK(shopkeeper)->visitct = 0;
				ESHK(shopkeeper)->following = 0;
				(void) strncpy(ESHK(shopkeeper)->customer, plname, PL_NSIZ);
				NOTANGRY(shopkeeper) = 1;
			}
			if (!ESHK(shopkeeper)->following) {
				boolean         box, pick;

				pline("Hello %s! Welcome%s to %s's %s shop!",
				      plname,
				ESHK(shopkeeper)->visitct++ ? " again" : "",
				      shkname(shopkeeper),
				      shopnam[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]);
				box = carrying(ICE_BOX);
				pick = carrying(PICK_AXE);
				if (box || pick) {
					if (dochug(shopkeeper)) {
						u.uinshop = 0;	/* he died moving */
						return (0);
					}
					pline("Will you please leave your %s outside?",
					(box && pick) ? "box and pick-axe" :
					      box ? "box" : "pick-axe");
				}
			}
			u.uinshop = roomno + 1;
		}
	}
	return (u.uinshop);
}

static void
findshk(int roomno)
{
	struct monst   *mtmp;
	for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
		if (mtmp->isshk && ESHK(mtmp)->shoproom == roomno
		    && ESHK(mtmp)->shoplevel == dlevel) {
			shopkeeper = mtmp;
			bill = &(ESHK(shopkeeper)->bill[0]);
			shlevel = dlevel;
			if (ANGRY(shopkeeper) &&
			strncmp(ESHK(shopkeeper)->customer, plname, PL_NSIZ))
				NOTANGRY(shopkeeper) = 1;
			/*
			 * billobjs = 0; -- this is wrong if we save in a
			 * shop
			 */
			/*
			 * (and it is harmless to have too many things in
			 * billobjs)
			 */
			return;
		}
	shopkeeper = 0;
	shlevel = 0;
	bill = (struct bill_x *) - 1000;	/* dump core when referenced */
}

static struct bill_x *
onbill(struct obj *obj)
{
	struct bill_x  *bp;
	if (!shopkeeper)
		return (0);
	for (bp = bill; bp < &bill[ESHK(shopkeeper)->billct]; bp++)
		if (bp->bo_id == obj->o_id) {
			if (!obj->unpaid)
				pline("onbill: paid obj on bill?");
			return (bp);
		}
	if (obj->unpaid)
		pline("onbill: unpaid obj not on bill?");
	return (0);
}

/* called with two args on merge */
void
obfree(struct obj *obj, struct obj *merge)
{
	struct bill_x  *bp = onbill(obj);
	struct bill_x  *bpm;
	if (bp) {
		if (!merge) {
			bp->useup = 1;
			obj->unpaid = 0;	/* only for doinvbill */
			obj->nobj = billobjs;
			billobjs = obj;
			return;
		}
		bpm = onbill(merge);
		if (!bpm) {
			/* this used to be a rename */
			impossible("obfree: not on bill??");
			return;
		} else {
			/* this was a merger */
			bpm->bquan += bp->bquan;
			ESHK(shopkeeper)->billct--;
			*bp = bill[ESHK(shopkeeper)->billct];
		}
	}
	free(obj);
}

static void
pay(long tmp, struct monst *shkp)
{
	long            robbed = ESHK(shkp)->robbed;

	u.ugold -= tmp;
	shkp->mgold += tmp;
	flags.botl = 1;
	if (robbed) {
		robbed -= tmp;
		if (robbed < 0)
			robbed = 0;
		ESHK(shkp)->robbed = robbed;
	}
}

int
dopay(void)
{
	long            ltmp;
	struct bill_x  *bp;
	struct monst   *shkp;
	int             pass, tmp;

	multi = 0;
	(void) inshop();
	for (shkp = fmon; shkp; shkp = shkp->nmon)
		if (shkp->isshk && dist(shkp->mx, shkp->my) < 3)
			break;
	if (!shkp && u.uinshop &&
	inroom(shopkeeper->mx, shopkeeper->my) == ESHK(shopkeeper)->shoproom)
		shkp = shopkeeper;

	if (!shkp) {
		pline("There is nobody here to receive your payment.");
		return (0);
	}
	ltmp = ESHK(shkp)->robbed;
	if (shkp != shopkeeper && NOTANGRY(shkp)) {
		if (!ltmp) {
			pline("You do not owe %s anything.", monnam(shkp));
		} else if (!u.ugold) {
			pline("You have no money.");
		} else {
			long            ugold = u.ugold;

			if (u.ugold > ltmp) {
				pline("You give %s the %ld gold pieces he asked for.",
				      monnam(shkp), ltmp);
				pay(ltmp, shkp);
			} else {
				pline("You give %s all your gold.", monnam(shkp));
				pay(u.ugold, shkp);
			}
			if (ugold < ltmp / 2) {
				pline("Unfortunately, he doesn't look satisfied.");
			} else {
				ESHK(shkp)->robbed = 0;
				ESHK(shkp)->following = 0;
				if (ESHK(shkp)->shoplevel != dlevel) {
					/*
					 * For convenience's sake, let him
					 * disappear
					 */
					shkp->minvent = 0;	/* %% */
					shkp->mgold = 0;
					mondead(shkp);
				}
			}
		}
		return (1);
	}
	if (!ESHK(shkp)->billct) {
		pline("You do not owe %s anything.", monnam(shkp));
		if (!u.ugold) {
			pline("Moreover, you have no money.");
			return (1);
		}
		if (ESHK(shkp)->robbed) {
#define min(a,b)	((a<b)?a:b)
			pline("But since his shop has been robbed recently,");
			pline("you %srepay %s's expenses.",
			 (u.ugold < ESHK(shkp)->robbed) ? "partially " : "",
			      monnam(shkp));
			pay(min(u.ugold, ESHK(shkp)->robbed), shkp);
			ESHK(shkp)->robbed = 0;
			return (1);
		}
		if (ANGRY(shkp)) {
			pline("But in order to appease %s,",
			      amonnam(shkp, "angry"));
			if (u.ugold >= 1000) {
				ltmp = 1000;
				pline(" you give him 1000 gold pieces.");
			} else {
				ltmp = u.ugold;
				pline(" you give him all your money.");
			}
			pay(ltmp, shkp);
			if (strncmp(ESHK(shkp)->customer, plname, PL_NSIZ)
			    || rn2(3)) {
				pline("%s calms down.", Monnam(shkp));
				NOTANGRY(shkp) = 1;
			} else
				pline("%s is as angry as ever.",
				      Monnam(shkp));
		}
		return (1);
	}
	if (shkp != shopkeeper) {
		impossible("dopay: not to shopkeeper?");
		if (shopkeeper)
			setpaid();
		return (0);
	}
	for (pass = 0; pass <= 1; pass++) {
		tmp = 0;
		while (tmp < ESHK(shopkeeper)->billct) {
			bp = &bill[tmp];
			if (!pass && !bp->useup) {
				tmp++;
				continue;
			}
			if (!dopayobj(bp))
				return (1);
			bill[tmp] = bill[--ESHK(shopkeeper)->billct];
		}
	}
	pline("Thank you for shopping in %s's %s store!",
	      shkname(shopkeeper),
	      shopnam[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]);
	NOTANGRY(shopkeeper) = 1;
	return (1);
}

/* return 1 if paid successfully */
/* 0 if not enough money */
/* -1 if object could not be found (but was paid) */
static int
dopayobj(struct bill_x *bp)
{
	struct obj     *obj;
	long            ltmp;

	/* find the object on one of the lists */
	obj = bp_to_obj(bp);

	if (!obj) {
		impossible("Shopkeeper administration out of order.");
		setpaid();	/* be nice to the player */
		return (0);
	}
	if (!obj->unpaid && !bp->useup) {
		impossible("Paid object on bill??");
		return (1);
	}
	obj->unpaid = 0;
	ltmp = bp->price * bp->bquan;
	if (ANGRY(shopkeeper))
		ltmp += ltmp / 3;
	if (u.ugold < ltmp) {
		pline("You don't have gold enough to pay %s.",
		      doname(obj));
		obj->unpaid = 1;
		return (0);
	}
	pay(ltmp, shopkeeper);
	pline("You bought %s for %ld gold piece%s.",
	      doname(obj), ltmp, plur(ltmp));
	if (bp->useup) {
		struct obj     *otmp = billobjs;
		if (obj == billobjs)
			billobjs = obj->nobj;
		else {
			while (otmp && otmp->nobj != obj)
				otmp = otmp->nobj;
			if (otmp)
				otmp->nobj = obj->nobj;
			else
				pline("Error in shopkeeper administration.");
		}
		free(obj);
	}
	return (1);
}

/* routine called after dying (or quitting) with nonempty bill */
void
paybill(void)
{
	if (shlevel == dlevel && shopkeeper && ESHK(shopkeeper)->billct) {
		addupbill();
		if (total > u.ugold) {
			shopkeeper->mgold += u.ugold;
			u.ugold = 0;
			pline("%s comes and takes all your possessions.",
			      Monnam(shopkeeper));
		} else {
			u.ugold -= total;
			shopkeeper->mgold += total;
			pline("%s comes and takes the %ld zorkmids you owed him.",
			      Monnam(shopkeeper), total);
		}
		setpaid();	/* in case we create bones */
	}
}

/* find obj on one of the lists */
static struct obj *
bp_to_obj(struct bill_x *bp)
{
	struct obj     *obj;
	struct monst   *mtmp;
	unsigned        id = bp->bo_id;

	if (bp->useup)
		obj = o_on(id, billobjs);
	else if (!(obj = o_on(id, invent)) &&
		 !(obj = o_on(id, fobj)) &&
		 !(obj = o_on(id, fcobj))) {
		for (mtmp = fmon; mtmp; mtmp = mtmp->nmon)
			if ((obj = o_on(id, mtmp->minvent)) != NULL)
				break;
		for (mtmp = fallen_down; mtmp; mtmp = mtmp->nmon)
			if ((obj = o_on(id, mtmp->minvent)) != NULL)
				break;
	}
	return (obj);
}

/* called in hack.c when we pickup an object */
void
addtobill(struct obj *obj)
{
	struct bill_x  *bp;
	if (!inshop() ||
	    (u.ux == ESHK(shopkeeper)->shk.x && u.uy == ESHK(shopkeeper)->shk.y) ||
	    (u.ux == ESHK(shopkeeper)->shd.x && u.uy == ESHK(shopkeeper)->shd.y) ||
	    onbill(obj)		/* perhaps we threw it away earlier */
		)
		return;
	if (ESHK(shopkeeper)->billct == BILLSZ) {
		pline("You got that for free!");
		return;
	}
	bp = &bill[ESHK(shopkeeper)->billct];
	bp->bo_id = obj->o_id;
	bp->bquan = obj->quan;
	bp->useup = 0;
	bp->price = getprice(obj);
	ESHK(shopkeeper)->billct++;
	obj->unpaid = 1;
}

void
splitbill(struct obj *obj, struct obj *otmp)
{
	/* otmp has been split off from obj */
	struct bill_x  *bp;
	int             tmp;
	bp = onbill(obj);
	if (!bp) {
		impossible("splitbill: not on bill?");
		return;
	}
	if (bp->bquan < otmp->quan) {
		impossible("Negative quantity on bill??");
	}
	if (bp->bquan == otmp->quan) {
		impossible("Zero quantity on bill??");
	}
	bp->bquan -= otmp->quan;

	/* addtobill(otmp); */
	if (ESHK(shopkeeper)->billct == BILLSZ)
		otmp->unpaid = 0;
	else {
		tmp = bp->price;
		bp = &bill[ESHK(shopkeeper)->billct];
		bp->bo_id = otmp->o_id;
		bp->bquan = otmp->quan;
		bp->useup = 0;
		bp->price = tmp;
		ESHK(shopkeeper)->billct++;
	}
}

void
subfrombill(struct obj *obj)
{
	long            ltmp;
	int             tmp;
	struct obj     *otmp;
	struct bill_x  *bp;
	if (!inshop() || (u.ux == ESHK(shopkeeper)->shk.x && u.uy == ESHK(shopkeeper)->shk.y) ||
	(u.ux == ESHK(shopkeeper)->shd.x && u.uy == ESHK(shopkeeper)->shd.y))
		return;
	if ((bp = onbill(obj)) != 0) {
		obj->unpaid = 0;
		if (bp->bquan > obj->quan) {
			otmp = newobj(0);
			*otmp = *obj;
			bp->bo_id = otmp->o_id = flags.ident++;
			otmp->quan = (bp->bquan -= obj->quan);
			otmp->owt = 0;	/* superfluous */
			otmp->onamelth = 0;
			bp->useup = 1;
			otmp->nobj = billobjs;
			billobjs = otmp;
			return;
		}
		ESHK(shopkeeper)->billct--;
		*bp = bill[ESHK(shopkeeper)->billct];
		return;
	}
	if (obj->unpaid) {
		pline("%s didn't notice.", Monnam(shopkeeper));
		obj->unpaid = 0;
		return;		/* %% */
	}
	/* he dropped something of his own - probably wants to sell it */
	if (shopkeeper->msleep || shopkeeper->mfroz ||
	inroom(shopkeeper->mx, shopkeeper->my) != ESHK(shopkeeper)->shoproom)
		return;
	if (ESHK(shopkeeper)->billct == BILLSZ ||
	    ((tmp = shtypes[rooms[ESHK(shopkeeper)->shoproom].rtype - 8]) && tmp != obj->olet)
	    || strchr("_0", obj->olet)) {
		pline("%s seems not interested.", Monnam(shopkeeper));
		return;
	}
	ltmp = getprice(obj) * obj->quan;
	if (ANGRY(shopkeeper)) {
		ltmp /= 3;
		NOTANGRY(shopkeeper) = 1;
	} else
		ltmp /= 2;
	if (ESHK(shopkeeper)->robbed) {
		if ((ESHK(shopkeeper)->robbed -= ltmp) < 0)
			ESHK(shopkeeper)->robbed = 0;
		pline("Thank you for your contribution to restock this recently plundered shop.");
		return;
	}
	if (ltmp > shopkeeper->mgold)
		ltmp = shopkeeper->mgold;
	pay(-ltmp, shopkeeper);
	if (!ltmp)
		pline("%s gladly accepts %s but cannot pay you at present.",
		      Monnam(shopkeeper), doname(obj));
	else
		pline("You sold %s and got %ld gold piece%s.", doname(obj), ltmp,
		      plur(ltmp));
}

/* mode:  0: deliver count 1: paged */
int
doinvbill(int mode)
{
	struct bill_x  *bp;
	struct obj     *obj;
	long            totused, thisused;
	char            buf[BUFSZ];

	if (mode == 0) {
		int             cnt = 0;

		if (shopkeeper)
			for (bp = bill; bp - bill < ESHK(shopkeeper)->billct; bp++)
				if (bp->useup ||
				    ((obj = bp_to_obj(bp)) && obj->quan < bp->bquan))
					cnt++;
		return (cnt);
	}
	if (!shopkeeper) {
		impossible("doinvbill: no shopkeeper?");
		return (0);
	}
	set_pager(0);
	if (page_line("Unpaid articles already used up:") || page_line(""))
		goto quit;

	totused = 0;
	for (bp = bill; bp - bill < ESHK(shopkeeper)->billct; bp++) {
		obj = bp_to_obj(bp);
		if (!obj) {
			impossible("Bad shopkeeper administration.");
			goto quit;
		}
		if (bp->useup || bp->bquan > obj->quan) {
			int             cnt, oquan, uquan;

			oquan = obj->quan;
			uquan = (bp->useup ? bp->bquan : bp->bquan - oquan);
			thisused = bp->price * uquan;
			totused += thisused;
			obj->quan = uquan;	/* cheat doname */
			(void) snprintf(buf, sizeof(buf),
					"x -  %s", doname(obj));
			obj->quan = oquan;	/* restore value */
			for (cnt = 0; buf[cnt]; cnt++);
			while (cnt < 50)
				buf[cnt++] = ' ';
			(void) snprintf(buf+cnt, sizeof(buf)-cnt,
					" %5ld zorkmids", thisused);
			if (page_line(buf))
				goto quit;
		}
	}
	(void) snprintf(buf, sizeof(buf), "Total:%50ld zorkmids", totused);
	if (page_line("") || page_line(buf))
		goto quit;
	set_pager(1);
	return (0);
quit:
	set_pager(2);
	return (0);
}

static int
getprice(struct obj *obj)
{
	int             tmp, ac;

	switch (obj->olet) {
	case AMULET_SYM:
		tmp = 10 * rnd(500);
		break;
	case TOOL_SYM:
		tmp = 10 * rnd((obj->otyp == EXPENSIVE_CAMERA) ? 150 : 30);
		break;
	case RING_SYM:
		tmp = 10 * rnd(100);
		break;
	case WAND_SYM:
		tmp = 10 * rnd(100);
		break;
	case SCROLL_SYM:
		tmp = 10 * rnd(50);
#ifdef MAIL
		if (obj->otyp == SCR_MAIL)
			tmp = rnd(5);
#endif	/* MAIL */
		break;
	case POTION_SYM:
		tmp = 10 * rnd(50);
		break;
	case FOOD_SYM:
		tmp = 10 * rnd(5 + (2000 / realhunger()));
		break;
	case GEM_SYM:
		tmp = 10 * rnd(20);
		break;
	case ARMOR_SYM:
		ac = ARM_BONUS(obj);
		if (ac <= -10)	/* probably impossible */
			ac = -9;
		tmp = 100 + ac * ac * rnd(10 + ac);
		break;
	case WEAPON_SYM:
		if (obj->otyp < BOOMERANG)
			tmp = 5 * rnd(10);
		else if (obj->otyp == LONG_SWORD ||
			 obj->otyp == TWO_HANDED_SWORD)
			tmp = 10 * rnd(150);
		else
			tmp = 10 * rnd(75);
		break;
	case CHAIN_SYM:
		pline("Strange ..., carrying a chain?");
		/* FALLTHROUGH */
	case BALL_SYM:
		tmp = 10;
		break;
	default:
		tmp = 10000;
	}
	return (tmp);
}

static int
realhunger(void)
{				/* not completely foolproof */
	int		tmp = u.uhunger;
	struct obj     *otmp = invent;
	while (otmp) {
		if (otmp->olet == FOOD_SYM && !otmp->unpaid)
			tmp += objects[otmp->otyp].nutrition;
		otmp = otmp->nobj;
	}
	return ((tmp <= 0) ? 1 : tmp);
}

int
shkcatch(struct obj *obj)
{
	struct monst   *shkp = shopkeeper;

	if (u.uinshop && shkp && !shkp->mfroz && !shkp->msleep &&
	    u.dx && u.dy &&
	    inroom(u.ux + u.dx, u.uy + u.dy) + 1 == u.uinshop &&
	    shkp->mx == ESHK(shkp)->shk.x && shkp->my == ESHK(shkp)->shk.y &&
	    u.ux == ESHK(shkp)->shd.x && u.uy == ESHK(shkp)->shd.y) {
		pline("%s nimbly catches the %s.", Monnam(shkp), xname(obj));
		obj->nobj = shkp->minvent;
		shkp->minvent = obj;
		return (1);
	}
	return (0);
}

/*
 * shk_move: return 1: he moved  0: he didnt  -1: let m_move do it
 */
int
shk_move(struct monst *shkp)
{
	struct monst   *mtmp;
	const struct permonst *mdat = shkp->data;
	xchar           gx, gy, omx, omy, nx, ny, nix, niy;
	schar           appr, i;
	int             udist;
	int             z;
	schar           shkroom, chi, chcnt, cnt;
	boolean         uondoor = 0, satdoor, avoid = 0, badinv;
	coord           poss[9];
	int             info[9];
	struct obj     *ib = 0;

	omx = shkp->mx;
	omy = shkp->my;

	if ((udist = dist(omx, omy)) < 3) {
		if (ANGRY(shkp)) {
			(void) hitu(shkp, d(mdat->damn, mdat->damd) + 1);
			return (0);
		}
		if (ESHK(shkp)->following) {
			if (strncmp(ESHK(shkp)->customer, plname, PL_NSIZ)) {
				pline("Hello %s! I was looking for %s.",
				      plname, ESHK(shkp)->customer);
				ESHK(shkp)->following = 0;
				return (0);
			}
			if (!ESHK(shkp)->robbed) {	/* impossible? */
				ESHK(shkp)->following = 0;
				return (0);
			}
			if (moves > followmsg + 4) {
				pline("Hello %s! Didn't you forget to pay?",
				      plname);
				followmsg = moves;
			}
			if (udist < 2)
				return (0);
		}
	}
	shkroom = inroom(omx, omy);
	appr = 1;
	gx = ESHK(shkp)->shk.x;
	gy = ESHK(shkp)->shk.y;
	satdoor = (gx == omx && gy == omy);
	if (ESHK(shkp)->following || ((z = holetime()) >= 0 && z * z <= udist)) {
		gx = u.ux;
		gy = u.uy;
		if (shkroom < 0 || shkroom != inroom(u.ux, u.uy))
			if (udist > 4)
				return (-1);	/* leave it to m_move */
	} else if (ANGRY(shkp)) {
		long            saveBlind = Blind;
		Blind = 0;
		if (shkp->mcansee && !Invis && cansee(omx, omy)) {
			gx = u.ux;
			gy = u.uy;
		}
		Blind = saveBlind;
		avoid = FALSE;
	} else {
#define	GDIST(x,y)	((x-gx)*(x-gx)+(y-gy)*(y-gy))
		if (Invis)
			avoid = FALSE;
		else {
			uondoor = (u.ux == ESHK(shkp)->shd.x &&
				   u.uy == ESHK(shkp)->shd.y);
			if (uondoor) {
				if (ESHK(shkp)->billct)
					pline("Hello %s! Will you please pay before leaving?",
					      plname);
				badinv = (carrying(PICK_AXE) || carrying(ICE_BOX));
				if (satdoor && badinv)
					return (0);
				avoid = !badinv;
			} else {
				avoid = (u.uinshop && dist(gx, gy) > 8);
				badinv = FALSE;
			}

			if (((!ESHK(shkp)->robbed && !ESHK(shkp)->billct) || avoid)
			    && GDIST(omx, omy) < 3) {
				if (!badinv && !online(omx, omy))
					return (0);
				if (satdoor)
					appr = gx = gy = 0;
			}
		}
	}
	if (omx == gx && omy == gy)
		return (0);
	if (shkp->mconf) {
		avoid = FALSE;
		appr = 0;
	}
	nix = omx;
	niy = omy;
	cnt = mfndpos(shkp, poss, info, ALLOW_SSM);
	if (avoid && uondoor) {	/* perhaps we cannot avoid him */
		for (i = 0; i < cnt; i++)
			if (!(info[i] & NOTONL))
				goto notonl_ok;
		avoid = FALSE;
notonl_ok:
		;
	}
	chi = -1;
	chcnt = 0;
	for (i = 0; i < cnt; i++) {
		nx = poss[i].x;
		ny = poss[i].y;
		if (levl[nx][ny].typ == ROOM
		    || shkroom != ESHK(shkp)->shoproom
		    || ESHK(shkp)->following) {
#ifdef STUPID
			/* cater for stupid compilers */
			int             zz;
#endif	/* STUPID */
			if (uondoor && (ib = sobj_at(ICE_BOX, nx, ny))) {
				nix = nx;
				niy = ny;
				chi = i;
				break;
			}
			if (avoid && (info[i] & NOTONL))
				continue;
			if ((!appr && !rn2(++chcnt)) ||
#ifdef STUPID
			    (appr && (zz = GDIST(nix, niy)) && zz > GDIST(nx, ny))
#else
			    (appr && GDIST(nx, ny) < GDIST(nix, niy))
#endif	/* STUPID */
				) {
				nix = nx;
				niy = ny;
				chi = i;
			}
		}
	}
	if (nix != omx || niy != omy) {
		if (info[chi] & ALLOW_M) {
			mtmp = m_at(nix, niy);
			if (mtmp == NULL)
				panic("error in shk_move");
			if (hitmm(shkp, mtmp) == 1 && rn2(3) &&
			    hitmm(mtmp, shkp) == 2)
				return (2);
			return (0);
		} else if (info[chi] & ALLOW_U) {
			(void) hitu(shkp, d(mdat->damn, mdat->damd) + 1);
			return (0);
		}
		shkp->mx = nix;
		shkp->my = niy;
		pmon(shkp);
		if (ib) {
			freeobj(ib);
			mpickobj(shkp, ib);
		}
		return (1);
	}
	return (0);
}

/* He is digging in the shop. */
void
shopdig(int fall)
{
	if (!fall) {
		if (u.utraptype == TT_PIT)
			pline("\"Be careful, sir, or you might fall through the floor.\"");
		else
			pline("\"Please, do not damage the floor here.\"");
	} else if (dist(shopkeeper->mx, shopkeeper->my) < 3) {
		struct obj     *obj, *obj2;

		pline("%s grabs your backpack!", shkname(shopkeeper));
		for (obj = invent; obj; obj = obj2) {
			obj2 = obj->nobj;
			if (obj->owornmask)
				continue;
			freeinv(obj);
			obj->nobj = shopkeeper->minvent;
			shopkeeper->minvent = obj;
			if (obj->unpaid)
				subfrombill(obj);
		}
	}
}
#endif	/* QUEST */

int
online(int x, int y)
{
	return (x == u.ux || y == u.uy ||
		(x - u.ux) * (x - u.ux) == (y - u.uy) * (y - u.uy));
}

/* Does this monster follow me downstairs? */
int
follower(struct monst *mtmp)
{
	return (mtmp->mtame || strchr("1TVWZi&, ", mtmp->data->mlet)
#ifndef QUEST
		|| (mtmp->isshk && ESHK(mtmp)->following)
#endif	/* QUEST */
		);
}
