/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008,2009,2010 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>
 */

#include <global.h>
#include <material.h>
#include <sproto.h>

/* This loads the settings file.  There could be debate whether this should
 * be here or in the common directory - but since only the server needs this
 * information, having it here probably makes more sense.
 */
void
load_settings ()
{
  object_thawer thawer (settings.confdir, "settings");

  if (!thawer)
    {
      LOG (llevError, "Error: No settings file found\n");
      exit (1);
    }

  while (thawer.kw)
    {
      const char *buf = thawer.kw_str;
      const char *cp  = thawer.value_nn;

      if (!strcmp (buf, "not_permadeth"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.not_permadeth = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.not_permadeth = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for not_permadeth" ": %s\n", cp);
            }
        }
      else if (!strcmp (buf, "resurrection"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.resurrection = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.resurrection = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for resurrection" ": %s\n", cp);
            }
        }
      else if (!strcmp (buf, "set_title"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.set_title = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.set_title = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for set_title" ": %s\n", cp);
            }
        }
      else if (!strcmp (buf, "search_items"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.search_items = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.search_items = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for search_items" ": %s\n", cp);
            }
        }
      else if (!strcmp (buf, "spell_encumbrance"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.spell_encumbrance = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.spell_encumbrance = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for " "spell_encumbrance: %s\n", cp);
            }
        }
      else if (!strcmp (buf, "spell_failure_effects"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.spell_failure_effects = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.spell_failure_effects = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for " "spell_failure_effects: %s\n", cp);
            }
        }
      else if (!strcmp (buf, "spellpoint_level_depend"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.spellpoint_level_depend = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.spellpoint_level_depend = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for " "spellpoint_level_depend: %s\n", cp);
            }
        }
      else if (!strcmp (buf, "stat_loss_on_death"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.stat_loss_on_death = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.stat_loss_on_death = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for " "stat_loss_on_death: %s\n", cp);
            }
        }
      else if (!strcmp (buf, "use_permanent_experience"))
        {
          LOG (llevError, "use_permanent_experience is deprecated, use" "permenent_experience_percentage instead\n");
        }
      else if (!strcmp (buf, "permanent_experience_percentage"))
        {
          int val = atoi (cp);

          if (val < 0 || val > 100)
            LOG (llevError, "load_settings: permenent_experience_percentage" "must be between 0 and 100, %d is invalid\n", val);
          else
            settings.permanent_exp_ratio = val;
        }
      else if (!strcmp (buf, "death_penalty_percentage"))
        {
          int val = atoi (cp);

          if (val < 0 || val > 100)
            LOG (llevError, "load_settings: death_penalty_percentage" "must be between 0 and 100, %d is invalid\n", val);
          else
            settings.death_penalty_ratio = val;
        }
      else if (!strcmp (buf, "death_penalty_levels"))
        {
          int val = atoi (cp);

          if (val < 0 || val > 255)
            LOG (llevError, "load_settings: death_penalty_levels" "can not be negative, %d is invalid\n", val);
          else
            settings.death_penalty_level = val;
        }
      else if (!strcmp (buf, "balanced_stat_loss"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.balanced_stat_loss = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.balanced_stat_loss = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for " "balanced_stat_loss: %s\n", cp);
            }
        }
      else if (!strcmp (buf, "simple_exp"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.simple_exp = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.simple_exp = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: Unknown value for simple_exp: %s\n", cp);
            }
        }
      else if (!strcmp (buf, "item_power_factor"))
        {
          float tmp = atof (cp);

          if (tmp < 0)
            LOG (llevError, "load_settings: item_power_factor must be a positive number (%f < 0)\n", tmp);
          else
            settings.item_power_factor = tmp;
        }
      else if (!strcmp (buf, "pk_luck_penalty"))
        {
          sint16 val = atoi (cp);

          if (val < -100 || val > 100)
            LOG (llevError, "load_settings: pk_luck_penalty must be between -100 and 100" ", %d is invalid\n", val);
          else
            settings.pk_luck_penalty = val;
        }
      else if (!strcmp (buf, "set_friendly_fire"))
        {
          int val = atoi (cp);

          if (val < 0 || val > 100)
            LOG (llevError, "load_settings: set_friendly_fire must be between 0 an 100" ", %d is invalid\n", val);
          else
            settings.set_friendly_fire = val;
        }
      else if (!strcmp (buf, "armor_max_enchant"))
        {
          int max_e = atoi (cp);

          if (max_e <= 0)
            LOG (llevError, "load_settings: armor_max_enchant is %d\n", max_e);
          else
            settings.armor_max_enchant = max_e;
        }
      else if (!strcmp (buf, "armor_weight_reduction"))
        {
          int wr = atoi (cp);

          if (wr < 0)
            LOG (llevError, "load_settings: armor_weight_reduction is %d\n", wr);
          else
            settings.armor_weight_reduction = wr;
        }
      else if (!strcmp (buf, "armor_weight_linear"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.armor_weight_linear = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.armor_weight_linear = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: unknown value for armor_weight_linear: %s\n", cp);
            }

        }
      else if (!strcmp (buf, "armor_speed_improvement"))
        {
          int wr = atoi (cp);

          if (wr < 0)
            LOG (llevError, "load_settings: armor_speed_improvement is %d\n", wr);
          else
            settings.armor_speed_improvement = wr;
        }
      else if (!strcmp (buf, "armor_speed_linear"))
        {
          if (!strcmp (cp, "on") || !strcmp (cp, "true"))
            {
              settings.armor_speed_linear = TRUE;
            }
          else if (!strcmp (cp, "off") || !strcmp (cp, "false"))
            {
              settings.armor_speed_linear = FALSE;
            }
          else
            {
              LOG (llevError, "load_settings: unknown value for armor_speed_linear: %s\n", cp);
            }

        }
      else
        thawer.parse_error ("settings file");

      thawer.next ();
    }
}

/*
 * init() is called only once, when starting the program.
 */
void
init (int argc, char **argv)
{
  init_done = 0;                /* Must be done before init_signal() */

  init_environ ();
  cfperl_init ();
  init_done = 1;
}

/* Signal handlers: */

static void
rec_sigabrt (int i)
{
  signal (SIGABRT, SIG_DFL);

  LOG (llevError, "SIGABRT received.\n");
  cleanup ("SIGABRT received", 1);
}

static void
rec_sigsegv (int i)
{
  signal (SIGSEGV, SIG_DFL);

  LOG (llevError, "SIGSEGV received.\n");
  cleanup ("SIGSEGV received", 1);
}

static void
rec_sigquit (int i)
{
  signal (SIGQUIT, SIG_IGN);

  LOG (llevInfo, "SIGQUIT received\n");
  cleanup ("SIGQUIT received", 1);
}

static void
rec_sigbus (int i)
{
  signal (SIGBUS, SIG_DFL);

  LOG (llevError, "SIGBUS received\n");
  cleanup ("SIGBUS received", 1);
}

void
reset_signals ()
{
  signal (SIGABRT, SIG_DFL);
  signal (SIGQUIT, SIG_DFL);
  signal (SIGSEGV, SIG_DFL);
  signal (SIGBUS , SIG_DFL);
  signal (SIGINT , SIG_DFL);
  signal (SIGTERM, SIG_DFL);
}

void
init_signals ()
{
  // large stack, but it's important data we want to save, and it is not usually
  // being physically allocated anyways
  const size_t stacksize = 8 * 1024 * 1024 + SIGSTKSZ;

  stack_t ss;
  ss.ss_sp = malloc (stacksize);
  ss.ss_flags = 0;
  ss.ss_size = stacksize;
  sigaltstack (&ss, 0);

  struct sigaction sa;

  sigfillset (&sa.sa_mask);
  sa.sa_flags = SA_RESTART;

  sa.sa_handler = SIG_IGN;     sigaction (SIGPIPE, &sa, 0);
  sa.sa_handler = rec_sigabrt; sigaction (SIGABRT, &sa, 0);
  sa.sa_handler = rec_sigquit; sigaction (SIGQUIT, &sa, 0);
  sa.sa_handler = rec_sigbus;  sigaction (SIGBUS,  &sa, 0);

  sa.sa_flags |= SA_ONSTACK;
  sa.sa_handler = rec_sigsegv; sigaction (SIGSEGV, &sa, 0);
}

static racelink *
get_racelist ()
{
  racelink *list = new racelink;

  list->name = 0;
  list->nrof = 0;
  list->next = 0;
  list->member = get_objectlink ();

  return list;
}

 racelink *
find_racelink (const char *name)
{
  if (name)
    for (racelink *link = first_race; link; link = link->next)
      if (!link->name || !strcmp (name, link->name))
        return link;

  return 0;
}

static void
add_to_racelist (const char *race_name, object *op)
{
  racelink *race;

  if (!op || !race_name)
    return;

  race = find_racelink (race_name);

  if (!race)
    {                           /* add in a new race list */
      race = get_racelist ();
      race->next = first_race;
      first_race = race;
      race->name = race_name;
    }

  if (race->member->ob)
    {
      objectlink *tmp = get_objectlink ();

      tmp->next = race->member;
      race->member = tmp;
    }

  race->nrof++;
  race->member->ob = op;
}

/* init_races() - reads the races file in the lib/ directory, then
 * overwrites old 'race' entries. This routine allow us to quickly
 * re-configure the 'alignment' of monsters, objects. Useful for
 * putting together lists of creatures, etc that belong to gods.
 */
static void
init_races ()
{
  FILE *file;
  char race[MAX_BUF], fname[MAX_BUF], buf[MAX_BUF], *cp, variable[MAX_BUF];
  archetype *mon = NULL;
  static int init_done = 0;

  if (init_done)
    return;
  init_done = 1;
  first_race = 0;

  sprintf (fname, "%s/races", settings.datadir);
  LOG (llevDebug, "Reading races from %s...\n", fname);
  if (!(file = fopen (fname, "r")))
    {
      LOG (llevError, "Cannot open races file %s: %s\n", fname, strerror (errno));
      return;
    }

  while (fgets (buf, MAX_BUF, file) != NULL)
    {
      int set_race = 1, set_list = 1;

      if (*buf == '#')
        continue;

      if ((cp = strchr (buf, '\n')) != NULL)
        *cp = '\0';

      cp = buf;
      while (*cp == ' ' || *cp == '!' || *cp == '@')
        {
          if (*cp == '!') set_race = 0;
          if (*cp == '@') set_list = 0;

          cp++;
        }

      if (sscanf (cp, "RACE %s", variable))
        /* set new race value */
        strcpy (race, variable);
      else
        {
          char *cp1;

          /* Take out beginning spaces */
          for (cp1 = cp; *cp1 == ' '; cp1++)
            ;
          /* Remove newline and trailing spaces */
          for (cp1 = cp + strlen (cp) - 1; *cp1 == '\n' || *cp1 == ' '; cp1--)
            {
              *cp1 = '\0';
              if (cp == cp1)
                break;
            }

          if (cp[strlen (cp) - 1] == '\n')
            cp[strlen (cp) - 1] = '\0';

          /* set creature race to race value */
          if ((mon = archetype::find (cp)) == NULL)
            LOG (llevError, "Creature %s in race file lacks archetype\n", cp);
          else
            {
              if (set_race && (!mon->race || strcmp (&mon->race, race)))
                {
                  if (mon->race)
                    LOG (llevDebug, "Resetting race to %s from %s for archetype %s\n", race, &mon->race, &mon->archname);

                  mon->race = race;
                }

              /* if the arch is a monster, add it to the race list */
              if (set_list && mon->flag [FLAG_MONSTER])
                add_to_racelist (race, mon);
            }
        }
    }

  fclose (file);
  LOG (llevDebug, "done.\n");
}

void
init_beforeplay ()
{
  init_artifacts ();            /* If not called before, reads all artifacts from file */
  init_races ();                /* overwrite race designations using entries in lib/races file */
  init_gods ();                 /* init linked list of gods from archs */
  init_readable ();             /* inits useful arrays for readable texts */
  init_formulae ();             /* If not called before, reads formulae from file */
}