/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2001 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>
 */

#include <time.h>
#include <stdio.h>
#include <global.h>
#include <rmg.h>
#include <rproto.h>
#include <sproto.h>

#define CEDE coroapi::cede_to_tick ()

random_map_params::random_map_params ()
{
  hv = newHV ();
}

random_map_params::random_map_params (random_map_params *RP)
{
  *this = *RP;

  HV *copy = newHV ();

  hv_iterinit (hv);

  // does not work for utf-8 keys
  while (HE *he = hv_iternext (hv))
    {
      STRLEN klen; const char *key = HePV (he, klen);
      hv_store (copy, key, klen, newSVsv (HeVAL (he)), HeHASH (he));
    }

  hv = copy;
}

random_map_params::random_map_params (HV *hv)
{
  this->hv = (HV *)SvREFCNT_inc_NN ((SV *)hv);

  assign (wall_name, get_str ("wall_name"));

  xsize               = get_iv ("xsize");
  ysize               = get_iv ("ysize");
  layoutoptions1      = get_iv ("layoutoptions1");
  layoutoptions2      = get_iv ("layoutoptions2");
  layoutoptions3      = get_iv ("layoutoptions3");
  difficulty          = get_iv ("difficulty");
  difficulty_given    = get_iv ("difficulty_given");
  difficulty_increase = get_nv ("difficulty_increase");
  dungeon_level       = get_iv ("dungeon_level");
  dungeon_depth       = get_iv ("dungeon_depth");
  total_map_hp        = get_nv ("total_map_hp"); // actually val64, but I am too lazy
  symmetry_used       = get_iv ("symmetry_used");
}

random_map_params::~random_map_params ()
{
  SvREFCNT_dec (hv);
}

shstr_tmp
random_map_params::as_shstr () const
{
  set ("xsize"              , xsize);
  set ("ysize"              , ysize);
  set ("layoutoptions1"     , layoutoptions1);
  set ("layoutoptions2"     , layoutoptions2);
  set ("layoutoptions3"     , layoutoptions3);
  set ("dungeon_depth"      , dungeon_depth);
  set ("difficulty"         , difficulty && difficulty_given ? difficulty : 0);
  set ("difficulty_increase", difficulty_increase);
  set ("dungeon_level"      , dungeon_level);

  dynbuf_text buf;
  hv_iterinit (hv);

  // does not work for utf-8 keys
  while (HE *he = hv_iternext (hv))
    {
      STRLEN klen; const char *key   = HePV (he, klen);
      STRLEN vlen; const char *value = SvPVutf8 (HeVAL (he), vlen);

      buf.fadd (key, klen);
      buf << ' ';
      buf.fadd (value, vlen);
      buf << '\n';
    }

  return shstr (buf);
}

noinline SV *
random_map_params::opt_sv (const char *option) const
{
  SV **he = hv_fetch (hv, option, strlen (option), 0);

  return he ? *he : 0;
}

noinline const_utf8_string
random_map_params::get_str (const char *option, const_utf8_string fallback) const
{
  SV *sv = opt_sv (option);
  return sv ? cfSvPVutf8_nolen (sv) : fallback;
}

noinline IV
random_map_params::get_iv (const char *option, IV fallback) const
{
  SV *sv = opt_sv (option);
  return sv ? SvIV (sv) : fallback;
}

noinline UV
random_map_params::get_uv (const char *option, UV fallback) const
{
  SV *sv = opt_sv (option);
  return sv ? SvUV (sv) : fallback;
}

noinline NV
random_map_params::get_nv (const char *option, NV fallback) const
{
  SV *sv = opt_sv (option);
  return sv ? SvNV (sv) : fallback;
}

noinline void
random_map_params::set (const char *option, SV *value) const
{
  int len = strlen (option);

  if (value)
    hv_store  (hv, option, len, value, 0);
  else
    hv_delete (hv, option, len, G_DISCARD);
}

noinline void
random_map_params::set (const char *option, const_utf8_string value) const
{
  set (option, value && *value ? newSVpvn_utf8 (value, strlen (value), 1) : 0);
}

void
random_map_params::set (const char *option, IV value) const
{
  set (option, newSViv (value));
}

void
random_map_params::set (const char *option, UV value) const
{
  set (option, newSVuv (value));
}

void
random_map_params::set (const char *option, NV value) const
{
  set (option, newSVnv (value));
}

bool
maptile::generate_random_map (random_map_params *RP)
{
  RP->Xsize = RP->xsize;
  RP->Ysize = RP->ysize;

  max_it (RP->dungeon_level, 1);

  IV expand2x    = RP->get_iv ("expand2x");
  UV random_seed = RP->get_uv ("random_seed");

  /* pick a random seed, or use the one from the input file */
  random_seed = random_seed
                ? random_seed + RP->dungeon_level
                : pticks;

  // we run "single-threaded"
  rmg_rndm.seed (random_seed);

  shstr buf = RP->as_shstr ();

  if (RP->difficulty == 0)
    {
      RP->difficulty = RP->dungeon_level;       /* use this instead of a map difficulty  */

      if (RP->difficulty_increase > 0.001f)
        RP->difficulty = RP->dungeon_level * RP->difficulty_increase;

      if (RP->difficulty < 1)
        RP->difficulty = 1;
    }
  else
    RP->difficulty_given = 1;

  if (RP->Xsize < MIN_RANDOM_MAP_SIZE)
    RP->Xsize = MIN_RANDOM_MAP_SIZE + rmg_rndm (25) + 5;

  if (RP->Ysize < MIN_RANDOM_MAP_SIZE)
    RP->Ysize = MIN_RANDOM_MAP_SIZE + rmg_rndm (25) + 5;

  min_it (RP->Xsize, MAX_RANDOM_MAP_SIZE);
  min_it (RP->Ysize, MAX_RANDOM_MAP_SIZE);

  int symmetry = RP->get_iv ("symmetry", SYMMETRY_NONE);

  if (symmetry == SYMMETRY_RANDOM)
    RP->symmetry_used = rmg_rndm (SYMMETRY_XY) + 1;
  else
    RP->symmetry_used = symmetry;

  if (RP->symmetry_used == SYMMETRY_Y || RP->symmetry_used == SYMMETRY_XY)
    RP->Ysize = RP->Ysize / 2 + 1;

  if (RP->symmetry_used == SYMMETRY_X || RP->symmetry_used == SYMMETRY_XY)
    RP->Xsize = RP->Xsize / 2 + 1;

  if (expand2x)
    {
      RP->Xsize /= 2;
      RP->Ysize /= 2;
    }

  const char *layoutstyle = RP->get_str ("layoutstyle", "");

  if (strstr (layoutstyle, "onion"))
    RP->map_layout_style = LAYOUT_ONION;
  else if (strstr (layoutstyle, "maze"))
    RP->map_layout_style = LAYOUT_MAZE;
  else if (strstr (layoutstyle, "spiral"))
    RP->map_layout_style = LAYOUT_SPIRAL;
  else if (strstr (layoutstyle, "rogue"))
    RP->map_layout_style = LAYOUT_ROGUELIKE;
  else if (strstr (layoutstyle, "snake"))
    RP->map_layout_style = LAYOUT_SNAKE;
  else if (strstr (layoutstyle, "squarespiral"))
    RP->map_layout_style = LAYOUT_SQUARE_SPIRAL;
  else if (strstr (layoutstyle, "cave"))
    RP->map_layout_style = LAYOUT_CAVE;
  else if (strstr (layoutstyle, "castle"))
    RP->map_layout_style = LAYOUT_CASTLE;
  else if (strstr (layoutstyle, "multiple"))
    RP->map_layout_style = LAYOUT_MULTIPLE;
  else
    RP->map_layout_style = rmg_rndm (NROFLAYOUTS - 1) + 1; /* No style found - choose one randomly */

  layout maze (RP->Xsize, RP->Ysize);
  maze.generate (RP);

  if (RP->get_iv ("rotate", 1))
    maze.rotate (rmg_rndm (4));

  maze.symmetrize (RP->symmetry_used);

  if (expand2x)
    maze.expand2x ();

#if 0
  maze.print ();//D
#endif

  /* increment these for the current map */
  ++RP->dungeon_level;

  // need to patch RP becasue following code doesn't use the layout object
  RP->Xsize = maze.w;
  RP->Ysize = maze.h;

  /* allocate the map and set the floor */
  make_map_floor (maze, RP->get_str ("floorstyle", ""), RP);

  /* set region */
  default_region = region::find (RP->get_str ("region", 0));

  CEDE;

  place_specials_in_map (this, maze, RP);

  CEDE;

  const char *wallstyle = RP->get_str ("wallstyle", "");

  /* create walls unless the wallstyle is "none" */
  if (strcmp (wallstyle, "none"))
    {
      make_map_walls (this, maze, wallstyle, RP->get_str ("miningstyle", ""), RP);

      const char *doorstyle = RP->get_str ("doorstyle", "");

      /* place doors unless doorstyle or wallstyle is "none" */
      if (strcmp (doorstyle, "none"))
        put_doors (this, maze, doorstyle, RP);
    }

  CEDE;

  const char *exitstyle = RP->get_str ("exitstyle", "");

  /* create exits unless the exitstyle is "none" */
  if (strcmp (exitstyle, "none"))
    place_exits (this, maze, exitstyle, RP->get_iv ("orientation", 0), RP);

  CEDE;

  const char *monsterstyle = RP->get_str ("monsterstyle", "");

  /* create monsters unless the monsterstyle is "none" */
  if (strcmp (monsterstyle, "none"))
    place_monsters (this, monsterstyle, RP->difficulty, RP);

  CEDE;

  /* treasures needs to have a proper difficulty set for the map. */
  difficulty = estimate_difficulty ();

  CEDE;

  const char *treasurestyle = RP->get_str ("treasurestyle", "");

  /* create treasure unless the treasurestyle is "none" */
  place_treasure (this, maze, treasurestyle, RP->get_iv ("treasureoptions"), RP);

  CEDE;

  const char *decorstyle = RP->get_str ("decorstyle", "");

  /* create decor unless the decorstyle is "none" */
  if (strcmp (decorstyle, "none"))
    put_decor (this, maze, decorstyle, RP->get_iv ("decoroptions"), RP);

  CEDE;

  /* generate treasures, etc. */
  fix_auto_apply ();

  CEDE;

  unblock_exits (this, maze);

  msg = buf;
  in_memory = MAP_INACTIVE; // this is probably a lie, but currently works with ext/map-random.ext

  CEDE;

  return 1;
}