/*	$NetBSD: hack.trap.c,v 1.10 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.trap.c,v 1.10 2011/08/07 06:03:45 dholland Exp $");
#endif				/* not lint */

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

const char            vowels[] = "aeiou";

const char           *const 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);

		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(const 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!");
}

void
float_down(void)
{
	struct trap    *trap;
	pline("You float gently to the ground.");
	if ((trap = t_at(u.ux, u.uy)) != NULL)
		switch (trap->ttyp) {
		case PIERC:
			break;
		case TRAPDOOR:
			if (!xdnstair || u.ustuck)
				break;
			/* FALLTHROUGH */
		default:
			dotrap(trap);
		}
	pickup(1);
}

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)
{
	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 (!digit(buf[0]) && (buf[0] != '-' || !digit(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[u.ux][u.uy].typ != POOL)
			return;
	}
	pline("You drown ...");
	killer = "pool of water";
	done("drowned");
}