/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2002 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992 Frank Tore Johansen
 *
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero 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 Affero GNU General Public License
 * and 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>
 */

/*  Specials in this file:
         included maps */

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

enum {
  NO_SPECIAL,
  SPECIAL_SUBMAP,
  SPECIAL_FOUNTAIN,
  SPECIAL_EXIT,
  NUM_OF_SPECIAL_TYPES
};

enum {
  GLORY_HOLE = 1,
  ORC_ZONE,
  MINING_ZONE,
  NR_OF_HOLE_TYPES
};

/* clear map completely of all !floor objects:
 * a rectangular area of xsize, ysize
 * is cleared with the top left corner at xstart, ystart
 */
static void
nuke_map_region (maptile *map, layout &maze, int xstart, int ystart, int xsize, int ysize)
{
  for (int i = xstart; i < xstart + xsize; i++)
    for (int j = ystart; j < ystart + ysize; j++)
      {
        maze[i][j] = 'S';

        for (object *tmp = map->at (i, j).bot; tmp; )
          if (tmp->flag [FLAG_IS_FLOOR])
            tmp = tmp->above;
          else
            {
              object *head = tmp->head_ ();
              tmp = tmp->above;
              head->destroy ();
            }
      }
}

/* copy in_map into dest_map at point x,y */
static void
include_map_in_map (maptile *dest_map, maptile *in_map, int x, int y)
{
  for (int i = 0; i < in_map->width; i++)
    for (int j = 0; j < in_map->height; j++)
      for (object *tmp = GET_MAP_OB (in_map, i, j); tmp; tmp = tmp->above)
        {
          /* don't copy tails: must be dealt with specially. */
          if (!tmp->is_head ())
            continue;

          object *new_ob = tmp->deep_clone ();

          if (tmp->flag [FLAG_IS_LINKED])
            new_ob->add_link (dest_map, tmp->find_link ()->id);

          dest_map->insert (new_ob, x + i, y + j, 0, INS_NO_MERGE | INS_NO_WALK_ON);
        }
}

static int
find_spot_for_submap (maptile *map, layout &maze, int *ix, int *iy, int xsize, int ysize)
{
  int blocked, i, j;

  /* don't even try to place a submap into a map if the big map isn't
     sufficiently large. */
  if (2 * xsize > map->width || 2 * ysize > map->height)
    return 0;

  /* search a bit for a completely free spot. */
  for (int tries = 0; tries < 20; tries++)
    {
      blocked = 0;

      /* pick a random location in the maze */
      i = rmg_rndm (1, map->width  - xsize - 2);
      j = rmg_rndm (1, map->height - ysize - 2);

      for (int l = i; l < i + xsize; l++)
        for (int m = j; m < j + ysize; m++)
          {
            blocked = 1;
            break;
          }

      if (!blocked)
        break;
    }

  /* if we failed, relax the restrictions */
  if (blocked)
    {                           /* failure, try a relaxed placer. */
      /* pick a random location in the maze */
      for (int tries = 0; tries < 10; tries++)
        {
          i = rmg_rndm (1, map->width  - xsize - 2);
          j = rmg_rndm (1, map->height - ysize - 2);

          blocked = 0;

          for (int l = i; l < i + xsize; l++)
            for (int m = j; m < j + ysize; m++)
              if (maze[l][m] != '#' && maze[l][m] != 'D' && maze[l][m] != 0)
                {
                  blocked = 1;
                  break;
                }
        }
    }

  if (blocked)
    return 0;

  *ix = i;
  *iy = j;

  return 1;
}

static void
place_fountain_with_specials (maptile *map)
{
  int ix, iy, i = -1, tries = 0;
  maptile *fountain_style = find_style ("/styles/misc", "fountains", -1);

  if (!fountain_style)
    {
      LOG (llevError, "unable to load stylemap /styles/misc fountains\n");
      return;
    }

  object *fountain = archetype::get (shstr_fountain);
  object *potion = fountain_style->pick_random_object (rmg_rndm)->clone ();

  while (i < 0 && tries < 10)
    {
      ix = rmg_rndm (map->width  - 2) + 1;
      iy = rmg_rndm (map->height - 2) + 1;
      i = rmg_find_free_spot (fountain, map, ix, iy, 1, SIZEOFFREE1 + 1);
      tries++;
    }

  if (i == -1)
    {                           /* can't place fountain */
      fountain->destroy ();
      potion->destroy ();
      return;
    }

  ix += DIRX (i);
  iy += DIRY (i);
  potion->face = fountain->face;
  potion->set_flag (FLAG_NO_PICK);
  potion->set_flag (FLAG_IDENTIFIED);
  potion->name = potion->name_pl = shstr_fountain;
  potion->x = ix;
  potion->y = iy;
  potion->material = name_to_material (shstr_adamantium);
  fountain->x = ix;
  fountain->y = iy;
  insert_ob_in_map (fountain, map, NULL, 0);
  insert_ob_in_map (potion, map, NULL, 0);
}

static void
place_special_exit (maptile *map, int hole_type, random_map_params *RP)
{
  maptile *exit_style = find_style ("/styles/misc", "obscure_exits", RP->difficulty);
  if (!exit_style)
    {
      LOG (llevError, "unable to load stylemap /styles/misc obscure_exits\n");
      return;
    }

  if (!exit_style)
    return;

  object *the_exit = exit_style->pick_random_object (rmg_rndm)->clone ();

  // put an upper bound here, just in case
  for (int repeat = 8192; --repeat; )
    {
      int ix = rmg_rndm (1, map->width  - 2);
      int iy = rmg_rndm (1, map->height - 2);

      int i = rmg_find_free_spot (the_exit, map, ix, iy, 1, SIZEOFFREE1 + 1);
      if (i >= 0)
        {
          the_exit->x = ix + DIRX (i);
          the_exit->y = iy + DIRY (i);
          break;
        }
    }

  if (!hole_type)
    hole_type = rmg_rndm (1, NR_OF_HOLE_TYPES - 1);

  const char *style, *decor, *mon;
  int g_xsize, g_ysize;

  switch (hole_type)
    {
      case GLORY_HOLE:         /* treasures */
        {
          g_xsize = rmg_rndm (3) + 4 + RP->difficulty / 4;
          g_ysize = rmg_rndm (3) + 4 + RP->difficulty / 4;
          style = "onion";
          decor = "special_wealth";
          mon = "none";
          break;
        }

      case ORC_ZONE:           /* hole with orcs in it. */
        {
          g_xsize = rmg_rndm (3) + 4 + RP->difficulty / 4;
          g_ysize = rmg_rndm (3) + 4 + RP->difficulty / 4;
          style = "onion";
          decor = "special_wealth";
          mon = "orc";
          break;
        }

      case MINING_ZONE:        /* hole with orcs in it. */
        {
          g_xsize = rmg_rndm (9) + 4 + RP->difficulty / 4;
          g_ysize = rmg_rndm (9) + 4 + RP->difficulty / 4;
          style = "maze";
          decor = "minerals2";
          mon = "none";
          break;
        }

      default:                 /* undefined */
        LOG (llevError, "place_special_exit: undefined hole type %d\n", hole_type);
        return;
    }

  /* Need to be at least this size, otherwise the load
   * code will generate new size values which are too large.
   */
  max_it (g_xsize, MIN_RANDOM_MAP_SIZE);
  max_it (g_ysize, MIN_RANDOM_MAP_SIZE);

  dynbuf_text buf;

  {
    random_map_params &rp = *new random_map_params; // for zero_intiialised to work...

    rp.hv = (HV *)newHV ();

    rp.xsize               = g_xsize;
    rp.ysize               = g_ysize;

    rp.set ("wallstyle"    , RP->get_str ("wallstyle" , 0));
    rp.set ("floorstyle"   , RP->get_str ("floorstyle", 0));
    rp.set ("exitstyle"    , RP->get_str ("exitstyle" , 0));
    rp.set ("region"       , RP->get_str ("region"    , 0));
    rp.set ("monsterstyle" , mon);
    rp.set ("treasurestyle", "none");
    rp.set ("layoutstyle"  , style);
    rp.set ("decorstyle"   , decor);
    rp.set ("decoroptions" , (IV)-1);
    rp.set ("symmetry"     , (IV)SYMMETRY_NONE);
    rp.set ("orientation"  , (IV)1);
    rp.set ("random_seed"  , RP->get_uv ("random_seed") + 0xdeadbeefU);

    rp.layoutoptions1      = RMOPT_WALLS_ONLY;
    rp.dungeon_depth       = RP->dungeon_level;
    rp.dungeon_level       = RP->dungeon_level;
    rp.difficulty          = RP->difficulty;
    rp.difficulty_given    = RP->difficulty;
    rp.difficulty_increase = RP->difficulty_increase;

    the_exit->slaying = shstr_random_map_exit;
    the_exit->msg     = rp.as_shstr ();

    delete &rp;
  }

  insert_ob_in_map (the_exit, map, NULL, 0);
}

void
place_specials_in_map (maptile *map, layout &maze, random_map_params *RP)
{
  switch (rmg_rndm (NUM_OF_SPECIAL_TYPES)) // can be NO_SPECIAL as well
    {
      case SPECIAL_SUBMAP:
        {
          /* includes a special map into the random map being made. */
          maptile *special_map = find_style ("/styles/specialmaps", 0, RP->difficulty, true);

          if (!special_map)
            break;

          int ix, iy; /* map insertion locatons */

          if (find_spot_for_submap (map, maze, &ix, &iy, special_map->width, special_map->height))
            {
              /* First, splatter everything in the dest map at the location */
              nuke_map_region (map, maze, ix, iy, special_map->width, special_map->height);
              include_map_in_map (map, special_map, ix, iy);
            }
        }

        break;

      case SPECIAL_FOUNTAIN:
        /* Make a special fountain:  an unpickable potion disguised as
           a fountain, or rather, colocated with a fountain. */
        place_fountain_with_specials (map);
        break;

      case SPECIAL_EXIT:
        /* Make an exit to another random map, e.g. a gloryhole. */
        place_special_exit (map, 0, RP);
        break;
    }
}