/*	SCCS Id: @(#)mkroom.c	3.1	92/11/14	*/
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* NetHack may be freely redistributed.  See license for details. */

/*
 * Entry points:
 *	mkroom() -- make and stock a room of a given type
 *	nexttodoor() -- return TRUE if adjacent to a door
 *	has_dnstairs() -- return TRUE if given room has a down staircase
 *	has_upstairs() -- return TRUE if given room has an up staircase
 *	courtmon() -- generate a court monster
 *	save_rooms() -- save rooms into file fd
 *	rest_rooms() -- restore rooms from file fd
 */

#include "hack.h"

#ifdef OVLB
static boolean FDECL(isbig, (struct mkroom *));
static struct mkroom * FDECL(pick_room,(BOOLEAN_P));
static void NDECL(mkshop), FDECL(mkzoo,(int)), NDECL(mkswamp);
static void NDECL(mktemple);
static coord * FDECL(shrine_pos, (int));
static struct permonst * NDECL(morguemon);
#ifdef ARMY
static struct permonst * NDECL(squadmon);
#endif
static void FDECL(save_room, (int,struct mkroom *));
static void FDECL(rest_room, (int,struct mkroom *));
#endif /* OVLB */

#define sq(x) ((x)*(x))

extern const struct shclass shtypes[];	/* defined in shknam.c */

#ifdef OVLB

static boolean
isbig(sroom)
register struct mkroom *sroom;
{
	register int area = (sroom->hx - sroom->lx + 1)
			   * (sroom->hy - sroom->ly + 1);
	return( area > 20 );
}

void
mkroom(roomtype)
/* make and stock a room of a given type */
int	roomtype;
{
    if (roomtype >= SHOPBASE)
	mkshop();	/* someday, we should be able to specify shop type */
    else switch(roomtype) {
	case COURT:	mkzoo(COURT); break;
	case ZOO:	mkzoo(ZOO); break;
	case BEEHIVE:	mkzoo(BEEHIVE); break;
	case MORGUE:	mkzoo(MORGUE); break;
	case BARRACKS:	mkzoo(BARRACKS); break;
	case SWAMP:	mkswamp(); break;
	case TEMPLE:	mktemple(); break;
	default:	impossible("Tried to make a room of type %d.", roomtype);
    }
}

static void
mkshop()
{
	register struct mkroom *sroom;
	int i = -1;
#ifdef WIZARD
# ifdef GCC_WARN
	register char *ep = (char *)0;
# else
	register char *ep;
# endif

	/* first determine shoptype */
	if(wizard){
		ep = getenv("SHOPTYPE");
		if(ep){
			if(*ep == 'z' || *ep == 'Z'){
				mkzoo(ZOO);
				return;
			}
			if(*ep == 'm' || *ep == 'M'){
				mkzoo(MORGUE);
				return;
			}
			if(*ep == 'b' || *ep == 'B'){
				mkzoo(BEEHIVE);
				return;
			}
			if(*ep == 't' || *ep == 'T' || *ep == '\\'){
				mkzoo(COURT);
				return;
			}
#ifdef ARMY
			if(*ep == 's' || *ep == 'S'){
				mkzoo(BARRACKS);
				return;
			}
#endif /* ARMY */
			if(*ep == '_'){
				mktemple();
				return;
			}
			if(*ep == '}'){
				mkswamp();
				return;
			}
			for(i=0; shtypes[i].name; i++)
				if(*ep == def_oc_syms[shtypes[i].symb])
				    goto gottype;
			if(*ep == 'g' || *ep == 'G')
				i = 0;
			else
				i = -1;
		}
	}
gottype:
#endif
	for(sroom = &rooms[0]; ; sroom++){
		if(sroom->hx < 0) return;
		if(sroom - rooms >= nroom) {
			pline("rooms not closed by -1?");
			return;
		}
		if(sroom->rtype != OROOM) continue;
		if(has_dnstairs(sroom) || has_upstairs(sroom))
			continue;
		if(
#ifdef WIZARD
		   (wizard && ep && sroom->doorct != 0) ||
#endif
			sroom->doorct == 1) break;
	}
	if (!sroom->rlit) {
		int x, y;

		for(x = sroom->lx - 1; x <= sroom->hx + 1; x++)
		for(y = sroom->ly - 1; y <= sroom->hy + 1; y++)
			levl[x][y].lit = 1;
		sroom->rlit = 1;
	}

	if(i < 0) {			/* shoptype not yet determined */
	    register int j;

	    /* pick a shop type at random */
	    for (j = rnd(100), i = 0; (j -= shtypes[i].prob) > 0; i++)
		continue;

	    /* big rooms cannot be wand or book shops,
	     * - so make them general stores
	     */
	    if(isbig(sroom) && (shtypes[i].symb == WAND_CLASS
				|| shtypes[i].symb == SPBOOK_CLASS)) i = 0;
	}
	sroom->rtype = SHOPBASE + i;

	/* set room bits before stocking the shop */
#ifdef SPECIALIZATION
	topologize(sroom, FALSE); /* doesn't matter - this is a special room */
#else
	topologize(sroom);
#endif

	/* stock the room with a shopkeeper and artifacts */
	stock_room(i, sroom);
}

static struct mkroom *
pick_room(strict)
register boolean strict;
/* pick an unused room, preferably with only one door */
{
	register struct mkroom *sroom;
	register int i = nroom;

	for(sroom = &rooms[rn2(nroom)]; i--; sroom++) {
		if(sroom == &rooms[nroom])
			sroom = &rooms[0];
		if(sroom->hx < 0)
			return (struct mkroom *)0;
		if(sroom->rtype != OROOM)	continue;
		if(!strict) {
		    if(has_upstairs(sroom) || (has_dnstairs(sroom) && rn2(3)))
			continue;
		} else if(has_upstairs(sroom) || has_dnstairs(sroom))
			continue;
		if(sroom->doorct == 1 || !rn2(5)
#ifdef WIZARD
						|| wizard
#endif
							)
			return sroom;
	}
	return (struct mkroom *)0;
}

static void
mkzoo(type)
int type;
{
	register struct mkroom *sroom;

	if ((sroom = pick_room(FALSE)) != 0) {
		sroom->rtype = type;
		fill_zoo(sroom);
	}
}

void
fill_zoo(sroom)
struct mkroom *sroom;
{
	struct monst *mon;
	register int sx,sy,i;
	int sh, tx, ty, goldlim, type = sroom->rtype;
	int rmno = (sroom - rooms) + ROOMOFFSET;
	coord mm;

#ifdef GCC_WARN
	tx = ty = goldlim = 0;
#endif

	sh = sroom->fdoor;
	switch(type) {
	    case COURT:
		if(level.flags.is_maze_lev) {
		    for(tx = sroom->lx; tx <= sroom->hx; tx++)
			for(ty = sroom->ly; ty <= sroom->hy; ty++)
			    if(IS_THRONE(levl[tx][ty].typ))
				goto throne_placed;
		}
		i = 100;
		do {	/* don't place throne on top of stairs */
			(void) somexy(sroom, &mm);
			tx = mm.x; ty = mm.y;
		} while (occupied((xchar)tx, (xchar)ty) && --i > 0);
	    throne_placed:
		/* TODO: try to ensure the enthroned monster is an M2_PRINCE */
		break;
	    case BEEHIVE:
		tx = sroom->lx + (sroom->hx - sroom->lx + 1)/2;
		ty = sroom->ly + (sroom->hy - sroom->ly + 1)/2;
		if(sroom->irregular) {
		    /* center might not be valid, so put queen elsewhere */
		    if(levl[tx][ty].roomno != rmno || levl[tx][ty].edge) {
			(void) somexy(sroom, &mm);
			tx = mm.x; ty = mm.y;
		    }
		}
		break;
	    case ZOO:
		goldlim = 500 * level_difficulty();
		break;
	}
	for(sx = sroom->lx; sx <= sroom->hx; sx++)
	    for(sy = sroom->ly; sy <= sroom->hy; sy++) {
		if(sroom->irregular) {
		    if(levl[sx][sy].roomno != rmno ||
		       levl[sx][sy].edge ||
			  (sroom->doorct &&
			   distmin(sx, sy, doors[sh].x, doors[sh].y) <= 1))
			continue;
		} else if(!SPACE_POS(levl[sx][sy].typ) ||
			  (sroom->doorct &&
			   ((sx == sroom->lx && doors[sh].x == sx-1) ||
			    (sx == sroom->hx && doors[sh].x == sx+1) ||
			    (sy == sroom->ly && doors[sh].y == sy-1) ||
			    (sy == sroom->hy && doors[sh].y == sy+1))))
		    continue;
		/* don't place monster on explicitly placed throne */
		if(type == COURT && IS_THRONE(levl[sx][sy].typ))
		    continue;
		mon = makemon(
		    (type == COURT) ? courtmon() :
#ifdef ARMY
		    (type == BARRACKS) ? squadmon() :
#endif
		    (type == MORGUE) ? morguemon() :
		    (type == BEEHIVE) ?
			(sx == tx && sy == ty ? &mons[PM_QUEEN_BEE] : 
			 &mons[PM_KILLER_BEE]) :
		    (struct permonst *) 0,
		   sx, sy);
		if(mon) {
			mon->msleep = 1;
			if (type==COURT && mon->mpeaceful) {
				mon->mpeaceful = 0;
				set_malign(mon);
			}
		}
		switch(type) {
		    case ZOO:
			if(sroom->doorct)
			    i = sq(dist2(sx,sy,doors[sh].x,doors[sh].y));
			else
			    i = goldlim;
			if(i >= goldlim) i = 5*level_difficulty();
			goldlim -= i;
			mkgold((long) rn1(i, 10), sx, sy);
			break;
		    case MORGUE:
			if(!rn2(5))
			    (void) mk_tt_object(CORPSE, sx, sy);
			if(!rn2(10))	/* lots of treasure buried with dead */
			    (void) mksobj_at((rn2(3)) ? LARGE_BOX : CHEST,
					     sx, sy, TRUE);
			break;
		    case BEEHIVE:
			if(!rn2(3))
			    (void) mksobj_at(LUMP_OF_ROYAL_JELLY, sx, sy, TRUE);
			break;
#ifdef ARMY
		    case BARRACKS:
			if(!rn2(20))	/* the payroll and some loot */
			    (void) mksobj_at((rn2(3)) ? LARGE_BOX : CHEST,
					     sx, sy, TRUE);
			break;
#endif
		}
	    }
	switch (type) {
	      case COURT:
		  levl[tx][ty].typ = THRONE;
		  (void) somexy(sroom, &mm);
		  mkgold((long) rn1(50 * level_difficulty(),10), mm.x, mm.y);
		  (void) mksobj_at(CHEST, mm.x, mm.y, TRUE); /* the royal coffers */
		  level.flags.has_court = 1;
		  break;
#ifdef ARMY
	      case BARRACKS:
		  level.flags.has_barracks = 1;
		  break;
#endif
	      case ZOO:
		  level.flags.has_zoo = 1;
		  break;
	      case MORGUE:
		  level.flags.has_morgue = 1;
		  break;
	      case SWAMP:
		  level.flags.has_swamp = 1;
		  break;
	      case BEEHIVE:
		  level.flags.has_beehive = 1;
		  break;
	}
}

void
mkundead(mm)   /* make a swarm of undead around mm */
coord *mm;
{
	register int cnt = (level_difficulty() + 1)/10 + rnd(5);
	register struct permonst *mdat;

	while(cnt--) {
	      mdat = morguemon();
	      if(enexto(mm, mm->x, mm->y, mdat))
		   (void) makemon(mdat, mm->x, mm->y);
	}
}

static struct permonst *
morguemon()
{
	register int i = rn2(100), hd = rn2(level_difficulty());

	if(hd > 10 && i < 10)
		return((Inhell || In_endgame(&u.uz)) ? 
		                    mkclass(S_DEMON,0) : &mons[ndemon()]);
	if(hd > 8 && i > 85)
		return(mkclass(S_VAMPIRE,0));

	return((i < 20) ? &mons[PM_GHOST]
			: (i < 40) ? &mons[PM_WRAITH] : mkclass(S_ZOMBIE,0));
}

static void
mkswamp()	/* Michiel Huisjes & Fred de Wilde */
{
	register struct mkroom *sroom;
	register int sx,sy,i,eelct = 0;

	for(i=0; i<5; i++) {		/* 5 tries */
		sroom = &rooms[rn2(nroom)];
		if(sroom->hx < 0 || sroom->rtype != OROOM ||
		   has_upstairs(sroom) || has_dnstairs(sroom))
			continue;

		/* satisfied; make a swamp */
		sroom->rtype = SWAMP;
		for(sx = sroom->lx; sx <= sroom->hx; sx++)
		for(sy = sroom->ly; sy <= sroom->hy; sy++)
		if(!OBJ_AT(sx, sy) &&
		   !MON_AT(sx, sy) && !t_at(sx,sy) && !nexttodoor(sx,sy)) {
		    if((sx+sy)%2) {
			levl[sx][sy].typ = POOL;
			if(!eelct || !rn2(4)) {
			    /* mkclass() won't do, as we might get kraken */
			    (void) makemon(rn2(5) ? &mons[PM_GIANT_EEL]
						  : &mons[PM_ELECTRIC_EEL],
						sx, sy);
			    eelct++;
			}
		    } else 
			if(!rn2(4))	/* swamps tend to be moldy */
			    (void) makemon(mkclass(S_FUNGUS,0), sx, sy);
		}
		level.flags.has_swamp = 1;
	}
}

static coord *
shrine_pos(roomno)
int roomno;
{
	static coord buf;
	struct mkroom *troom = &rooms[roomno - ROOMOFFSET];

	buf.x = troom->lx + ((troom->hx - troom->lx) / 2);
	buf.y = troom->ly + ((troom->hy - troom->ly) / 2);
	return(&buf);
}

static void
mktemple()
{
	register struct mkroom *sroom;
	coord *shrine_spot;
	register struct rm *lev;

	if(!(sroom = pick_room(TRUE))) return;

	/* set up Priest and shrine */
	sroom->rtype = TEMPLE;
	/*
	 * In temples, shrines are blessed altars
	 * located in the center of the room
	 */
	shrine_spot = shrine_pos((sroom - rooms) + ROOMOFFSET);
	lev = &levl[shrine_spot->x][shrine_spot->y];
	lev->typ = ALTAR;
	lev->altarmask = induced_align(80);
	priestini(&u.uz, sroom, shrine_spot->x, shrine_spot->y, FALSE);
 	lev->altarmask |= AM_SHRINE;
	level.flags.has_temple = 1;
}

boolean
nexttodoor(sx,sy)
register int sx, sy;
{
	register int dx, dy;
	register struct rm *lev;
	for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) {
		if(!isok(sx+dx, sy+dy)) continue;
		if(IS_DOOR((lev = &levl[sx+dx][sy+dy])->typ) ||
		    lev->typ == SDOOR)
			return(TRUE);
	}
	return(FALSE);
}

boolean
has_dnstairs(sroom)
register struct mkroom *sroom;
{
	if (sroom == dnstairs_room)
		return TRUE;
	if (sstairs.sx && !sstairs.up)
		return sroom == sstairs_room;
	return FALSE;
}

boolean
has_upstairs(sroom)
register struct mkroom *sroom;
{
	if (sroom == upstairs_room)
		return TRUE;
	if (sstairs.sx && sstairs.up)
		return sroom == sstairs_room;
	return FALSE;
}

#endif /* OVLB */
#ifdef OVL0

int
somex(croom)
register struct mkroom *croom;
{
	return rn2(croom->hx-croom->lx+1) + croom->lx;
}

int
somey(croom)
register struct mkroom *croom;
{
	return rn2(croom->hy-croom->ly+1) + croom->ly;
}

boolean
inside_room(croom, x, y)
struct mkroom *croom;
xchar x, y;
{
	return (x >= croom->lx-1 && x <= croom->hx+1 &&
		y >= croom->ly-1 && y <= croom->hy+1);
}

boolean
somexy(croom, c)
struct mkroom *croom;
coord *c;
{
	int try_cnt = 0;
	int i;

	if (croom->irregular) {
	    i = (croom - rooms) + ROOMOFFSET;

	    while(try_cnt++ < 100) {
		c->x = somex(croom);
		c->y = somey(croom);
		if(!levl[c->x][c->y].edge && levl[c->x][c->y].roomno == i)
		    return TRUE;
	    }
	    /* try harder; exhaustively search until one is found */
	    for(c->x = croom->lx; c->x <= croom->hx; c->x++)
		for(c->y = croom->ly; c->y <= croom->hy; c->y++)
		    if(!levl[c->x][c->y].edge && levl[c->x][c->y].roomno == i)
			return TRUE;
	    return FALSE;
	}

	if (!croom->nsubrooms) {
		c->x = somex(croom);
		c->y = somey(croom);
		return TRUE;
	}

	/* Check that coords doesn't fall into a subroom or into a wall */

	while(try_cnt++ < 100) {
		c->x = somex(croom);
		c->y = somey(croom);
		if (IS_WALL(levl[c->x][c->y].typ))
		    continue;
		for(i=0 ; i<croom->nsubrooms;i++)
		    if(inside_room(croom->sbrooms[i], c->x, c->y))
			goto you_lose;
		break;
you_lose:	;
	}
	if (try_cnt >= 100)
	    return FALSE;
	return TRUE;
}

/* 
 * Search for a special room given its type (zoo, court, etc...)
 * 	Special values :
 * 		- ANY_SHOP
 * 		- ANY_TYPE
 */

struct mkroom *
search_special(type)
schar type;
{
	register struct mkroom *croom;

	for(croom = &rooms[0]; croom->hx >= 0; croom++)
	    if((type == ANY_TYPE && croom->rtype != OROOM) ||
	       (type == ANY_SHOP && croom->rtype >= SHOPBASE) ||
	       croom->rtype == type)
		return croom;
	for(croom = &subrooms[0]; croom->hx >= 0; croom++)
	    if((type == ANY_TYPE && croom->rtype != OROOM) ||
	       (type == ANY_SHOP && croom->rtype >= SHOPBASE) ||
	       croom->rtype == type)
		return croom;
	return (struct mkroom *) 0;
}

#endif /* OVL0 */
#ifdef OVLB

struct permonst *
courtmon()
{
	int     i = rn2(60) + rn2(3*level_difficulty());
	if (i > 100)		return(mkclass(S_DRAGON,0));
	else if (i > 95)	return(mkclass(S_GIANT,0));
	else if (i > 85)	return(mkclass(S_TROLL,0));
	else if (i > 75)	return(mkclass(S_CENTAUR,0));
	else if (i > 60)	return(mkclass(S_ORC,0));
	else if (i > 45)	return(&mons[PM_BUGBEAR]);
	else if (i > 30)	return(&mons[PM_HOBGOBLIN]);
	else if (i > 15)	return(mkclass(S_GNOME,0));
	else			return(mkclass(S_KOBOLD,0));
}

#ifdef ARMY
#define	    NSTYPES	(PM_CAPTAIN-PM_SOLDIER+1)

static struct {
    unsigned	pm;
    unsigned	prob;
} squadprob[NSTYPES] = {
    {PM_SOLDIER, 80}, {PM_SERGEANT, 15}, {PM_LIEUTENANT, 4}, {PM_CAPTAIN, 1}
};

static struct permonst *
squadmon() {	    /* return soldier types. */

	register struct permonst *ptr;
	register int	i, cpro, sel_prob = rnd(80+level_difficulty());

	for(cpro = i = 0; i < NSTYPES; i++)
	    if((cpro += squadprob[i].prob) > sel_prob) {

		ptr = &mons[squadprob[i].pm];
		goto gotone;
	    }
	ptr = &mons[squadprob[rn2(NSTYPES)].pm];
gotone:
	if(!(ptr->geno & (G_GENOD | G_EXTINCT)))  return(ptr);
	else			    return((struct permonst *) 0);
}
#endif /* ARMY /* */

/* 
 * save_room : A recursive function that saves a room and its subrooms 
 * (if any).
 */

static void
save_room(fd, r)
int	fd;
struct mkroom *r;
{
	short i;
	/* 
	 * Well, I really should write only useful informations instead
	 * of writing the whole structure. That is I should not write
	 * the subrooms pointers, but who cares ?
	 */
	bwrite(fd, (genericptr_t) r, sizeof(struct mkroom));
	for(i=0; i<r->nsubrooms; i++)
	    save_room(fd, r->sbrooms[i]);
}

/* 
 * save_rooms : Save all the rooms on disk!
 */

void
save_rooms(fd)
int fd;
{
	short i;

	/* First, write the number of rooms */
	bwrite(fd, (genericptr_t) &nroom, sizeof(nroom));
	for(i=0; i<nroom; i++)
	    save_room(fd, &rooms[i]);
}

static void
rest_room(fd, r)
int fd;
struct mkroom *r;
{
	short i;

	mread(fd, (genericptr_t) r, sizeof(struct mkroom));
	for(i=0; i<r->nsubrooms; i++) {
		r->sbrooms[i] = &subrooms[nsubroom];
		rest_room(fd, &subrooms[nsubroom++]);
	}
}

/* 
 * rest_rooms : That's for restore rooms. Read the rooms structure from
 * the disk.
 */

void
rest_rooms(fd)
int	fd;
{
	short i;

	mread(fd, (genericptr_t) &nroom, sizeof(nroom));
	nsubroom = 0;
	for(i = 0; i<nroom; i++) {
	    rest_room(fd, &rooms[i]);
	    rooms[i].resident = (struct monst *)0;
	}
	rooms[nroom].hx = -1;		/* restore ending flags */
	subrooms[nsubroom].hx = -1;
}
#endif /* OVLB */

/*mkroom.c*/