/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2001,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Deliantra is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

/*  placing treasure in maps, where appropriate.  */

#include <global.h>
#include <random_map.h>
#include <rproto.h>

/* some defines for various options which can be set. */

#define CONCENTRATED 1          /* all the treasure is at the C's for onions. */
#define HIDDEN 2                /* doors to treasure are hidden. */
#define KEYREQUIRED 4           /* chest has a key, which is placed randomly in the map. */
#define DOORED 8                /* treasure has doors around it. */
#define TRAPPED 16              /* trap dropped in same location as chest. */
#define SPARSE 32               /* 1/2 as much treasure as default */
#define RICH 64                 /* 2x as much treasure as default */
#define FILLED 128              /* Fill/tile the entire map with treasure */
#define LAST_OPTION 64          /* set this to the last real option, for random */

#define NO_PASS_DOORS 0
#define PASS_DOORS 1

/*  a macro to get a strongly centered random distribution,
    from 0 to x, centered at x/2 */
static int
bc_random (int x)
{
  return (rmg_rndm (x) + rmg_rndm (x) + rmg_rndm (x)) / 3;
}

/* returns true if square x,y has P_NO_PASS set, which is true for walls
 * and doors but not monsters.
 * This function is not map tile aware.
 */
int
wall_blocked (maptile *m, int x, int y)
{
  if (OUT_OF_REAL_MAP (m, x, y))
    return 1;

  m->at (x, y).update ();
  return GET_MAP_MOVE_BLOCK (m, x, y) & MOVE_WALK;
}

/* place treasures in the map, given the 
map,         (required)
layout,      (required)
treasure style    (may be empty or NULL, or "none" to cause no treasure.)
treasureoptions   (may be 0 for random choices or positive)
*/
void
place_treasure (maptile *map, char **layout, char *treasure_style, int treasureoptions, random_map_params *RP)
{
  char styledirname[1024];
  char stylefilepath[1024];
  maptile *style_map = 0;
  int num_treasures;

  /* bail out if treasure isn't wanted. */
  if (treasure_style)
    if (!strcmp (treasure_style, "none"))
      return;

  if (treasureoptions <= 0)
    treasureoptions = rmg_rndm (2 * LAST_OPTION);

  /* filter out the mutually exclusive options */
  if ((treasureoptions & RICH) && (treasureoptions & SPARSE))
    {
      if (rmg_rndm (2))
        treasureoptions -= 1;
      else
        treasureoptions -= 2;
    }

  /* pick the number of treasures */
  if (treasureoptions & SPARSE)
    num_treasures = bc_random (RP->total_map_hp / 600 + RP->difficulty / 2 + 1);
  else if (treasureoptions & RICH)
    num_treasures = bc_random (RP->total_map_hp / 150 + 2 * RP->difficulty + 1);
  else
    num_treasures = bc_random (RP->total_map_hp / 300 + RP->difficulty + 1);

  if (num_treasures <= 0)
    return;

  /* get the style map */
  sprintf (styledirname, "%s", "/styles/treasurestyles");
  sprintf (stylefilepath, "%s/%s", styledirname, treasure_style);
  style_map = find_style (styledirname, treasure_style, -1);

  if (!style_map)
    {
      LOG (llevError, "unable to load style map %s %s.\n", styledirname, treasure_style);
      return;
    }

  /* all the treasure at one spot in the map. */
  if (treasureoptions & CONCENTRATED)
    {
      /* map_layout_style global, and is previously set */
      switch (RP->map_layout_style)
        {
          case LAYOUT_ONION:
          case LAYOUT_SPIRAL:
          case LAYOUT_SQUARE_SPIRAL:
            {
              int i, j;

              /* search the onion for C's or '>', and put treasure there. */
              for (i = 0; i < RP->Xsize; i++)
                {
                  for (j = 0; j < RP->Ysize; j++)
                    {
                      if (layout[i][j] == 'C' || layout[i][j] == '>')
                        {
                          int tdiv = RP->symmetry_used;
                          object *chest;

                          if (tdiv == 3)
                            tdiv = 2;   /* this symmetry uses a divisor of 2 */

                          /* don't put a chest on an exit. */
                          chest = place_chest (treasureoptions, i, j, map, style_map, num_treasures / tdiv, RP);

                          if (!chest)
                            continue;   /* if no chest was placed NEXT */

                          if (treasureoptions & (DOORED | HIDDEN))
                            {
                              object **doorlist = find_doors_in_room (map, i, j, RP);
                              lock_and_hide_doors (doorlist, map, treasureoptions, RP);
                              free (doorlist);
                            }
                        }
                    }
                }
              break;
            }

          default:
            {
              int i, j, tries;
              object *chest;
              object **doorlist;

              i = j = -1;
              tries = 0;
              while (i == -1 && tries < 100)
                {
                  i = rmg_rndm (RP->Xsize - 2) + 1;
                  j = rmg_rndm (RP->Ysize - 2) + 1;
                  find_enclosed_spot (map, &i, &j, RP);

                  if (wall_blocked (map, i, j))
                    i = -1;

                  tries++;
                }

              chest = place_chest (treasureoptions, i, j, map, style_map, num_treasures, RP);

              if (!chest)
                return;

              i = chest->x;
              j = chest->y;
              if (treasureoptions & (DOORED | HIDDEN))
                {
                  doorlist = surround_by_doors (map, layout, i, j, treasureoptions);
                  lock_and_hide_doors (doorlist, map, treasureoptions, RP);
                  free (doorlist);
                }
            }
        }
    }
  else
    {                           /* DIFFUSE treasure layout */
      int ti, i, j;

      for (ti = 0; ti < num_treasures; ti++)
        {
          i = rmg_rndm (RP->Xsize - 2) + 1;
          j = rmg_rndm (RP->Ysize - 2) + 1;
          place_chest (treasureoptions, i, j, map, style_map, 1, RP);
        }
    }
}

/* put a chest into the map, near x and y, with the treasure style
        determined (may be null, or may be a treasure list from lib/treasures,
        if the global variable "treasurestyle" is set to that treasure list's name */
object *
place_chest (int treasureoptions, int x, int y, maptile *map, maptile *style_map, int n_treasures, random_map_params *RP)
{
  object *the_chest = archetype::get (shstr_chest);  /* was "chest_2" */

  /* first, find a place to put the chest. */
  int i = find_first_free_spot (the_chest, map, x, y); // this call uses the main rng
  if (i == -1)
    {
      the_chest->destroy ();
      return NULL;
    }

  int xl = x + freearr_x[i];
  int yl = y + freearr_y[i];

  /* if the placement is blocked, return a fail. */
  if (wall_blocked (map, xl, yl))
    return 0;

  /* put the treasures in the chest. */
  /*  if(style_map) { */
#if 0                           /* don't use treasure style maps for now!  */
  int ti;

  /* if treasurestyle lists a treasure list, use it. */
  treasurelist *tlist = find_treasurelist (RP->treasurestyle);

  if (tlist != NULL)
    for (ti = 0; ti < n_treasures; ti++)
      {                         /* use the treasure list */
        object *new_treasure = style_map->pick_random_object (rmg_rndm);

        insert_ob_in_ob (arch_to_object (new_treasure->arch), the_chest);
      }
  else
    {                           /* use the style map */
      the_chest->randomitems = tlist;
      the_chest->stats.hp = n_treasures;
    }
#endif
  {                             /* neither style_map no treasure list given */
    treasurelist *tlist = treasurelist::find ("chest");

    the_chest->randomitems = tlist;
    the_chest->stats.hp = n_treasures;
  }

  /* stick a trap in the chest if required  */
  if (treasureoptions & TRAPPED)
    {
      maptile *trap_map = find_style ("/styles/trapstyles", "traps", -1);

      if (trap_map)
        {
          object *the_trap = trap_map->pick_random_object (rmg_rndm);

          the_trap->stats.Cha = 10 + RP->difficulty;
          the_trap->level = bc_random ((3 * RP->difficulty) / 2);

          if (the_trap)
            {
              object *new_trap = the_trap->arch->instance ();//TODO: why not clone?

              new_trap->x = x;
              new_trap->y = y;
              insert_ob_in_ob (new_trap, the_chest);
            }
        }
    }

  /* set the chest lock code, and call the keyplacer routine with
     the lockcode.  It's not worth bothering to lock the chest if
     there's only 1 treasure.... */
  if ((treasureoptions & KEYREQUIRED) && n_treasures > 1)
    {
      char keybuf[1024];

      sprintf (keybuf, "%d", rmg_rndm (1000000000));
      the_chest->slaying = keybuf;
      keyplace (map, x, y, keybuf, PASS_DOORS, 1, RP);
    }

  /* actually place the chest. */
  the_chest->x = xl;
  the_chest->y = yl;
  insert_ob_in_map (the_chest, map, NULL, 0);
  return the_chest;
}


/* finds the closest monster and returns him, regardless of doors
        or walls */
object *
find_closest_monster (maptile *map, int x, int y, random_map_params *RP)
{
  int i;

  for (i = 0; i < SIZEOFFREE; i++)
    {
      int lx, ly;

      lx = x + freearr_x[i];
      ly = y + freearr_y[i];
      /* boundscheck */
      if (lx >= 0 && ly >= 0 && lx < RP->Xsize && ly < RP->Ysize)
        /* don't bother searching this square unless the map says life exists. */
        if (GET_MAP_FLAGS (map, lx, ly) & P_IS_ALIVE)
          {
            object *the_monster = GET_MAP_OB (map, lx, ly);

            for (; the_monster != NULL && (!QUERY_FLAG (the_monster, FLAG_MONSTER)); the_monster = the_monster->above);
            if (the_monster && QUERY_FLAG (the_monster, FLAG_MONSTER))
              return the_monster;
          }
    }
  return NULL;
}



/* places keys in the map, preferably in something alive.  
        keycode is the key's code,
        door_flag is either PASS_DOORS or NO_PASS_DOORS.
          NO_PASS_DOORS won't cross doors or walls to keyplace, PASS_DOORS will.
        if n_keys is 1, it will place 1 key.  if n_keys >1, it will place 2-4 keys:
        it will place 2-4 keys regardless of what nkeys is provided nkeys > 1.

        The idea is that you call keyplace on x,y where a door is, and it'll make
        sure a key is placed on both sides of the door.
*/
int
keyplace (maptile *map, int x, int y, char *keycode, int door_flag, int n_keys, random_map_params *RP)
{
  int i, j;
  int kx = 0, ky = 0;
  object *the_keymaster;        /* the monster that gets the key. */

  /* get a key and set its keycode */
  object *the_key = archetype::get (shstr_key2);
  the_key->slaying = keycode;

  if (door_flag == PASS_DOORS)
    {
      int tries = 0;

      the_keymaster = 0;
      while (tries < 15 && !the_keymaster)
        {
          i = rmg_rndm (RP->Xsize - 2) + 1;
          j = rmg_rndm (RP->Ysize - 2) + 1;
          tries++;
          the_keymaster = find_closest_monster (map, i, j, RP);
        }

      /* if we don't find a good keymaster, drop the key on the ground. */
      if (!the_keymaster)
        {
          int freeindex;

          freeindex = -1;
          for (tries = 0; tries < 15 && freeindex == -1; tries++)
            {
              kx = rmg_rndm (RP->Xsize - 2) + 1;
              ky = rmg_rndm (RP->Ysize - 2) + 1;
              freeindex = find_free_spot (the_key, map, kx, ky, 1, SIZEOFFREE1 + 1);
            }

          // can freeindex ever be < 0?
          if (freeindex >= 0)
            {
              kx += freearr_x [freeindex];
              ky += freearr_y [freeindex];
            }
        }
    }
  else
    {                           /* NO_PASS_DOORS --we have to work harder. */
      /* don't try to keyplace if we're sitting on a blocked square and
         NO_PASS_DOORS is set. */
      if (n_keys == 1)
        {
          if (wall_blocked (map, x, y))
            return 0;

          the_keymaster = find_monster_in_room (map, x, y, RP);
          if (!the_keymaster)    /* if fail, find a spot to drop the key. */
            find_spot_in_room (map, x, y, &kx, &ky, RP);
        }
      else
        {
          int sum = 0;          /* count how many keys we actually place */

          /* I'm lazy, so just try to place in all 4 directions. */
          sum += keyplace (map, x + 1, y, keycode, NO_PASS_DOORS, 1, RP);
          sum += keyplace (map, x, y + 1, keycode, NO_PASS_DOORS, 1, RP);
          sum += keyplace (map, x - 1, y, keycode, NO_PASS_DOORS, 1, RP);
          sum += keyplace (map, x, y - 1, keycode, NO_PASS_DOORS, 1, RP);

          if (sum < 2)          /* we might have made a disconnected map-place more keys. */
            {                   /* diagonally this time. */
              keyplace (map, x + 1, y + 1, keycode, NO_PASS_DOORS, 1, RP);
              keyplace (map, x + 1, y - 1, keycode, NO_PASS_DOORS, 1, RP);
              keyplace (map, x - 1, y + 1, keycode, NO_PASS_DOORS, 1, RP);
              keyplace (map, x - 1, y - 1, keycode, NO_PASS_DOORS, 1, RP);
            }

          return 1;
        }
    }

  if (!the_keymaster)
    {
      the_key->x = kx;
      the_key->y = ky;
      insert_ob_in_map (the_key, map, NULL, 0);
      return 1;
    }

  insert_ob_in_ob (the_key, the_keymaster->head_ ());
  return 1;
}



/* both find_monster_in_room routines need to have access to this. */

object *theMonsterToFind;

/* a recursive routine which will return a monster, eventually,if there is one.
   it does a check-off on the layout, converting 0's to 1's */

object *
find_monster_in_room_recursive (char **layout, maptile *map, int x, int y, random_map_params *RP)
{
  int i, j;

  /* if we've found a monster already, leave */
  if (theMonsterToFind != NULL)
    return theMonsterToFind;

  /* bounds check x and y */
  if (!(x >= 0 && y >= 0 && x < RP->Xsize && y < RP->Ysize))
    return theMonsterToFind;

  /* if the square is blocked or searched already, leave */
  if (layout[x][y] != 0)
    return theMonsterToFind;    /* might be NULL, that's fine. */

  /* check the current square for a monster.  If there is one,
     set theMonsterToFind and return it. */
  layout[x][y] = 1;
  if (GET_MAP_FLAGS (map, x, y) & P_IS_ALIVE)
    {
      object *the_monster = GET_MAP_OB (map, x, y);

      /* check off this point */
      for (; the_monster != NULL && (!QUERY_FLAG (the_monster, FLAG_ALIVE)); the_monster = the_monster->above);
      if (the_monster && QUERY_FLAG (the_monster, FLAG_ALIVE))
        {
          theMonsterToFind = the_monster;
          return theMonsterToFind;
        }
    }

  /* now search all the 8 squares around recursively for a monster,in random order */
  for (i = rmg_rndm (8), j = 0; j < 8 && theMonsterToFind == NULL; i++, j++)
    {
      theMonsterToFind = find_monster_in_room_recursive (layout, map, x + freearr_x[i % 8 + 1], y + freearr_y[i % 8 + 1], RP);
      if (theMonsterToFind != NULL)
        return theMonsterToFind;
    }

  return theMonsterToFind;
}

/* sets up some data structures:  the _recursive form does the
   real work.  */
object *
find_monster_in_room (maptile *map, int x, int y, random_map_params *RP)
{
  Layout layout2 (RP);

  layout2->clear ();

  /* allocate and copy the layout, converting C to 0. */
  for (int i = 0; i < layout2->w; i++)
    for (int j = 0; j < layout2->h; j++)
      if (wall_blocked (map, i, j))
        layout2[i][j] = '#';

  theMonsterToFind = 0;
  theMonsterToFind = find_monster_in_room_recursive (layout2, map, x, y, RP);

  layout2.free ();

  return theMonsterToFind;
}

/* a datastructure needed by find_spot_in_room and find_spot_in_room_recursive */
int *room_free_spots_x;
int *room_free_spots_y;
int number_of_free_spots_in_room;

/* the workhorse routine, which finds the free spots in a room:
a datastructure of free points is set up, and a position chosen from
that datastructure. */
void
find_spot_in_room_recursive (char **layout, int x, int y, random_map_params *RP)
{
  int i, j;

  /* bounds check x and y */
  if (!(x >= 0 && y >= 0 && x < RP->Xsize && y < RP->Ysize))
    return;

  /* if the square is blocked or searched already, leave */
  if (layout[x][y] != 0)
    return;

  /* set the current square as checked, and add it to the list.
     set theMonsterToFind and return it. */
  /* check off this point */
  layout[x][y] = 1;
  room_free_spots_x[number_of_free_spots_in_room] = x;
  room_free_spots_y[number_of_free_spots_in_room] = y;
  number_of_free_spots_in_room++;

  /* now search all the 8 squares around recursively for free spots,in random order */
  for (i = rmg_rndm (8), j = 0; j < 8 && theMonsterToFind == NULL; i++, j++)
    find_spot_in_room_recursive (layout, x + freearr_x[i % 8 + 1], y + freearr_y[i % 8 + 1], RP);

}

/* find a random non-blocked spot in this room to drop a key. */
void
find_spot_in_room (maptile *map, int x, int y, int *kx, int *ky, random_map_params *RP)
{
  char **layout2;
  int i, j;

  number_of_free_spots_in_room = 0;
  room_free_spots_x = (int *) calloc (sizeof (int), RP->Xsize * RP->Ysize);
  room_free_spots_y = (int *) calloc (sizeof (int), RP->Xsize * RP->Ysize);

  layout2 = (char **) calloc (sizeof (char *), RP->Xsize);
  /* allocate and copy the layout, converting C to 0. */
  for (i = 0; i < RP->Xsize; i++)
    {
      layout2[i] = (char *) calloc (sizeof (char), RP->Ysize);
      for (j = 0; j < RP->Ysize; j++)
        if (wall_blocked (map, i, j))
          layout2[i][j] = '#';
    }

  /* setup num_free_spots and room_free_spots */
  find_spot_in_room_recursive (layout2, x, y, RP);

  if (number_of_free_spots_in_room > 0)
    {
      i = rmg_rndm (number_of_free_spots_in_room);
      *kx = room_free_spots_x[i];
      *ky = room_free_spots_y[i];
    }

  /* deallocate the temp. layout */
  for (i = 0; i < RP->Xsize; i++)
    free (layout2[i]);

  free (layout2);
  free (room_free_spots_x);
  free (room_free_spots_y);
}


/* searches the map for a spot with walls around it.  The more
        walls the better, but it'll settle for 1 wall, or even 0, but
        it'll return 0 if no FREE spots are found.*/
void
find_enclosed_spot (maptile *map, int *cx, int *cy, random_map_params *RP)
{
  int x, y;
  int i;

  x = *cx;
  y = *cy;

  for (i = 0; i <= SIZEOFFREE1; i++)
    {
      int lx, ly, sindex;

      lx = x + freearr_x[i];
      ly = y + freearr_y[i];
      sindex = surround_flag3 (map, lx, ly, RP);
      /* if it's blocked on 3 sides, it's enclosed */
      if (sindex == 7 || sindex == 11 || sindex == 13 || sindex == 14)
        {
          *cx = lx;
          *cy = ly;
          return;
        }
    }

  /* OK, if we got here, we're obviously someplace where there's no enclosed
     spots--try to find someplace which is 2x enclosed.  */
  for (i = 0; i <= SIZEOFFREE1; i++)
    {
      int lx, ly, sindex;

      lx = x + freearr_x[i];
      ly = y + freearr_y[i];
      sindex = surround_flag3 (map, lx, ly, RP);
      /* if it's blocked on 3 sides, it's enclosed */
      if (sindex == 3 || sindex == 5 || sindex == 9 || sindex == 6 || sindex == 10 || sindex == 12)
        {
          *cx = lx;
          *cy = ly;
          return;
        }
    }

  /* settle for one surround point */
  for (i = 0; i <= SIZEOFFREE1; i++)
    {
      int lx, ly, sindex;

      lx = x + freearr_x[i];
      ly = y + freearr_y[i];
      sindex = surround_flag3 (map, lx, ly, RP);
      /* if it's blocked on 3 sides, it's enclosed */
      if (sindex)
        {
          *cx = lx;
          *cy = ly;
          return;
        }
    }
  /* give up and return the closest free spot. */
  i = find_free_spot (archetype::find (shstr_chest), map, x, y, 1, SIZEOFFREE1 + 1);

  if (i != -1)
    {
      *cx = x + freearr_x[i];
      *cy = y + freearr_y[i];
    }
  else
    {
      /* indicate failure */
      *cx = -1;
      *cy = -1;
    }
}

void
remove_monsters (int x, int y, maptile *map)
{
  object *tmp;

  for (tmp = GET_MAP_OB (map, x, y); tmp; tmp = tmp->above)
    if (QUERY_FLAG (tmp, FLAG_ALIVE))
      {
        if (tmp->head)
          tmp = tmp->head;
        tmp->remove ();
        tmp->destroy ();
        tmp = GET_MAP_OB (map, x, y);
        if (tmp == NULL)
          break;
      };
}

/*  surrounds the point x,y by doors, so as to enclose something, like
         a chest.  It only goes as far as the 8 squares surrounding, and
         it'll remove any monsters it finds.*/
object **
surround_by_doors (maptile *map, char **layout, int x, int y, int opts)
{
  int i;
  const char *doors[2];
  object **doorlist;
  int ndoors_made = 0;
  doorlist = (object **) calloc (9, sizeof (object *)); /* 9 doors so we can hold termination null */

  /* this is a list we pick from, for horizontal and vertical doors */
  if (opts & DOORED)
    {
      doors[0] = "locked_door2";
      doors[1] = "locked_door1";
    }
  else
    {
      doors[0] = "door_1";
      doors[1] = "door_2";
    }

  /* place doors in all the 8 adjacent unblocked squares. */
  for (i = 1; i < 9; i++)
    {
      int x1 = x + freearr_x[i], y1 = y + freearr_y[i];

      if (!wall_blocked (map, x1, y1) && layout[x1][y1] == '>')
        {                       /* place a door */
          remove_monsters (x1, y1, map);

          object *new_door = get_archetype (freearr_x[i] == 0 ? doors[1] : doors[0]);
          map->insert (new_door, x1, y1);
          doorlist[ndoors_made] = new_door;
          ndoors_made++;
        }
    }

  return doorlist;
}


/* returns the first door in this square, or NULL if there isn't a door. */
object *
door_in_square (maptile *map, int x, int y)
{
  object *tmp;

  for (tmp = GET_MAP_OB (map, x, y); tmp != NULL; tmp = tmp->above)
    if (tmp->type == DOOR || tmp->type == LOCKED_DOOR)
      return tmp;
  return NULL;
}

/* the workhorse routine, which finds the doors in a room */
void
find_doors_in_room_recursive (char **layout, maptile *map, int x, int y, object **doorlist, int *ndoors, random_map_params *RP)
{
  int i, j;
  object *door;

  /* bounds check x and y */
  if (!(x >= 0 && y >= 0 && x < RP->Xsize && y < RP->Ysize))
    return;

  /* if the square is blocked or searched already, leave */
  if (layout[x][y] == 1)
    return;

  /* check off this point */
  if (layout[x][y] == '#')
    {                           /* there could be a door here */
      layout[x][y] = 1;
      door = door_in_square (map, x, y);
      if (door)
        {
          doorlist[*ndoors] = door;

          if (*ndoors > 1022)    /* eek!  out of memory */
            {
              LOG (llevError, "find_doors_in_room_recursive:Too many doors for memory allocated!\n");
              return;
            }

          *ndoors = *ndoors + 1;
        }
    }
  else
    {
      layout[x][y] = 1;

      /* now search all the 8 squares around recursively for free spots,in random order */
      for (i = rmg_rndm (8), j = 0; j < 8 && !theMonsterToFind; i++, j++)
        find_doors_in_room_recursive (layout, map,
                                      x + freearr_x[i % 8 + 1], y + freearr_y[i % 8 + 1],
                                      doorlist, ndoors, RP);
    }
}

/* find a random non-blocked spot in this room to drop a key. */
object **
find_doors_in_room (maptile *map, int x, int y, random_map_params *RP)
{
  int i, j;
  int ndoors = 0;

  object **doorlist = (object **)calloc (sizeof (int), 1024);

  LayoutData layout2 (RP->Xsize, RP->Ysize);
  layout2.clear ();

  /* allocate and copy the layout, converting C to 0. */
  for (i = 0; i < RP->Xsize; i++)
    for (j = 0; j < RP->Ysize; j++)
      layout2[i][j] = wall_blocked (map, i, j) ? '#' : 0;

  /* setup num_free_spots and room_free_spots */
  find_doors_in_room_recursive (layout2, map, x, y, doorlist, &ndoors, RP);

  return doorlist;
}

/* locks and/or hides all the doors in doorlist, or does nothing if
        opts doesn't say to lock/hide doors. */
void
lock_and_hide_doors (object **doorlist, maptile *map, int opts, random_map_params *RP)
{
  object *door;
  int i;

  /* lock the doors and hide the keys. */

  if (opts & DOORED)
    {
      for (i = 0, door = doorlist[0]; doorlist[i] != NULL; i++)
        {
          object *new_door = get_archetype ("locked_door1");
          char keybuf[1024];

          door = doorlist[i];
          new_door->face = door->face;
          new_door->x = door->x;
          new_door->y = door->y;
          door->remove ();
          door->destroy ();
          doorlist[i] = new_door;
          insert_ob_in_map (new_door, map, NULL, 0);
          sprintf (keybuf, "%d", rmg_rndm (1000000000));
          new_door->slaying = keybuf;
          keyplace (map, new_door->x, new_door->y, keybuf, NO_PASS_DOORS, 2, RP);
        }
    }

  /* change the faces of the doors and surrounding walls to hide them. */
  if (opts & HIDDEN)
    {
      for (i = 0, door = doorlist[0]; doorlist[i] != NULL; i++)
        {
          object *wallface;

          door = doorlist[i];
          wallface = retrofit_joined_wall (map, door->x, door->y, 1, RP);
          if (wallface != NULL)
            {
              retrofit_joined_wall (map, door->x - 1, door->y, 0, RP);
              retrofit_joined_wall (map, door->x + 1, door->y, 0, RP);
              retrofit_joined_wall (map, door->x, door->y - 1, 0, RP);
              retrofit_joined_wall (map, door->x, door->y + 1, 0, RP);

              door->face = wallface->face;

              if (!QUERY_FLAG (wallface, FLAG_REMOVED))
                wallface->remove ();

              wallface->destroy ();
            }
        }
    }
}