/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program 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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The authors can be reached via e-mail at <crossfire@schmorp.de>
*/

#include <cassert>

#include <global.h>
#include <funcpoint.h>
#include <loader.h>

#define USE_UNORDERED_MAP 0

#if USE_UNORDERED_MAP
# include <tr1/functional>
# include <tr1/unordered_map>
#endif

int arch_cmp = 0;               /* How many strcmp's */
int arch_search = 0;            /* How many searches */
int arch_init;                  /* True if doing arch initialization */

/* The naming of these functions is really poor - they are all
 * pretty much named '.._arch_...', but they may more may not
 * return archetypes.  Some make the arch_to_object call, and thus
 * return an object.  Perhaps those should be called 'archob' functions
 * to denote they return an object derived from the archetype.
 * MSW 2003-04-29
 */

#if USE_UNORDERED_MAP
// the hashtable
typedef std::tr1::unordered_map
  <
    std::size_t,
    arch_ptr,
    std::tr1::hash<size_t>,
    std::equal_to<size_t>,
    slice_allocator< std::pair<const std::size_t, archetype *> >
    true,
  > HT;

static HT ht;
#else
static arch_ptr arch_table[ARCHTABLE];
#endif

/**
 * GROS -  This function retrieves an archetype given the name that appears
 * during the game (for example, "writing pen" instead of "stylus").
 * It does not use the hashtable system, but browse the whole archlist each time.
 * I suggest not to use it unless you really need it because of performance issue.
 * It is currently used by scripting extensions (create-object).
 * Params:
 * - name: the name we're searching for (ex: "writing pen");
 * Return value:
 * - the archetype found or null if nothing was found.
 */
archetype *
find_archetype_by_object_name (const char *name)
{
  archetype *at;

  if (name == NULL)
    return (archetype *) NULL;

  for (at = first_archetype; at != NULL; at = at->next)
    {
      if (!strcmp (at->clone.name, name))
        return at;
    }
  return NULL;
}

/**
 * This function retrieves an archetype by type and name that appears during
 * the game. It is basically the same as find_archetype_by_object_name()
 * except that it considers only items of the given type.
 */
archetype *
find_archetype_by_object_type_name (int type, const char *name)
{
  archetype *at;

  if (name == NULL)
    return NULL;

  for (at = first_archetype; at != NULL; at = at->next)
    {
      if (at->clone.type == type && strcmp (at->clone.name, name) == 0)
        return at;
    }

  return NULL;
}

/* This is a lot like the above function.  Instead, we are trying to match
 * the arch->skill values.  type is the type of object to match
 * against (eg, to only match against skills or only skill objects for example).
 * If type is -1, ew don't match on type.
 */
object *
get_archetype_by_skill_name (const char *skill, int type)
{
  archetype *
    at;

  if (skill == NULL)
    return NULL;

  for (at = first_archetype; at != NULL; at = at->next)
    {
      if (((type == -1) || (type == at->clone.type)) && (!strcmp (at->clone.skill, skill)))
        return arch_to_object (at);
    }
  return NULL;
}

/* similiar to above - this returns the first archetype
 * that matches both the type and subtype.  type and subtype
 * can be -1 to say ignore, but in this case, the match it does
 * may not be very useful.  This function is most useful when
 * subtypes are known to be unique for a particular type
 * (eg, skills)
 */
archetype *
get_archetype_by_type_subtype (int type, int subtype)
{
  archetype *
    at;

  for (at = first_archetype; at != NULL; at = at->next)
    {
      if (((type == -1) || (type == at->clone.type)) && (subtype == -1 || subtype == at->clone.subtype))
        return at;
    }
  return NULL;
}

/**
 * GROS - this returns a new object given the name that appears during the game
 * (for example, "writing pen" instead of "stylus").
 * Params:
 * - name: The name we're searching for (ex: "writing pen");
 * Return value:
 * - a corresponding object if found; a singularity object if not found.
 * Note by MSW - it appears that it takes the full name and keeps
 * shortening it until it finds a match.  I re-wrote this so that it
 * doesn't malloc it each time - not that this function is used much,
 * but it otherwise had a big memory leak.
 */
object *
get_archetype_by_object_name (const char *name)
{
  archetype *at;
  char tmpname[MAX_BUF];
  int i;

  assign (tmpname, name);

  for (i = strlen (tmpname); i > 0; i--)
    {
      tmpname[i] = 0;
      at = find_archetype_by_object_name (tmpname);

      if (at != NULL)
        return arch_to_object (at);
    }

  return create_singularity (name);
}

 /* This is a subset of the parse_id command.  Basically, name can be
  * a string seperated lists of things to match, with certain keywords.
  * pl is the player (only needed to set count properly)
  * op is the item we are trying to match.  Calling function takes care
  * of what action might need to be done and if it is valid
  * (pickup, drop, etc.)  Return NONZERO if we have a match.  A higher
  * value means a better match.  0 means no match.
  *
  * Brief outline of the procedure:
  * We take apart the name variable into the individual components.
  * cases for 'all' and unpaid are pretty obvious.
  * Next, we check for a count (either specified in name, or in the
  * player object.)
  * If count is 1, make a quick check on the name.
  * IF count is >1, we need to make plural name.  Return if match.
  * Last, make a check on the full name.
  */
int
item_matched_string (object *pl, object *op, const char *name)
{
  char *cp, local_name[MAX_BUF];
  int count, retval = 0;

  strcpy (local_name, name);    /* strtok is destructive to name */

  for (cp = strtok (local_name, ","); cp; cp = strtok (NULL, ","))
    {
      while (cp[0] == ' ')
        ++cp;                   /* get rid of spaces */

      /*      LOG(llevDebug,"Trying to match %s\n", cp); */
      /* All is a very generic match - low match value */
      if (!strcmp (cp, "all"))
        return 1;

      /* unpaid is a little more specific */
      if (!strcmp (cp, "unpaid") && QUERY_FLAG (op, FLAG_UNPAID))
        return 2;
      if (!strcmp (cp, "cursed") && QUERY_FLAG (op, FLAG_KNOWN_CURSED) && (QUERY_FLAG (op, FLAG_CURSED) || QUERY_FLAG (op, FLAG_DAMNED)))
        return 2;

      if (!strcmp (cp, "unlocked") && !QUERY_FLAG (op, FLAG_INV_LOCKED))
        return 2;

      /* Allow for things like '100 arrows' */
      if ((count = atoi (cp)) != 0)
        {
          cp = strchr (cp, ' ');
          while (cp && cp[0] == ' ')
            ++cp;               /* get rid of spaces */
        }
      else
        {
          if (pl->type == PLAYER)
            count = pl->contr->count;
          else
            count = 0;
        }

      if (!cp || cp[0] == '\0' || count < 0)
        return 0;


      /* The code here should go from highest retval to lowest.  That
       * is because of the 'else' handling - we don't want to match on
       * something and set a low retval, even though it may match a higher retcal
       * later.  So keep it in descending order here, so we try for the best
       * match first, and work downward.
       */
      if (!strcasecmp (cp, query_name (op)))
        retval = 20;
      else if (!strcasecmp (cp, query_short_name (op)))
        retval = 18;
      else if (!strcasecmp (cp, query_base_name (op, 0)))
        retval = 16;
      else if (!strcasecmp (cp, query_base_name (op, 1)))
        retval = 16;
      else if (op->custom_name && !strcasecmp (cp, op->custom_name))
        retval = 15;
      else if (!strncasecmp (cp, query_base_name (op, 0), strlen (cp)))
        retval = 14;
      else if (!strncasecmp (cp, query_base_name (op, 1), strlen (cp)))
        retval = 14;
      /* Do substring checks, so things like 'Str+1' will match.
       * retval of these should perhaps be lower - they are lower
       * then the specific strcasecmp aboves, but still higher than
       * some other match criteria.
       */
      else if (strstr (query_base_name (op, 1), cp))
        retval = 12;
      else if (strstr (query_base_name (op, 0), cp))
        retval = 12;
      else if (strstr (query_short_name (op), cp))
        retval = 12;
      /* Check against plural/non plural based on count. */
      else if (count > 1 && !strcasecmp (cp, op->name_pl))
        retval = 6;
      else if (count == 1 && !strcasecmp (op->name, cp))
        retval = 6;
      /* base name matched - not bad */
      else if (strcasecmp (cp, op->name) == 0 && !count)
        retval = 4;
      /* Check for partial custom name, but give a real low priority */
      else if (op->custom_name && strstr (op->custom_name, cp))
        retval = 3;

      if (retval)
        {
          if (pl->type == PLAYER)
            pl->contr->count = count;

          return retval;
        }
    }

  return 0;
}

/*
 * Initialises the internal linked list of archetypes (read from file).
 * Then the global "empty_archetype" pointer is initialised.
 * Then the blocksview[] array is initialised.
 */

void
init_archetypes (void)
{                               /* called from add_player() and edit() */
  if (first_archetype != NULL)  /* Only do this once */
    return;

  arch_init = 1;
  load_archetypes ();
  arch_init = 0;
  empty_archetype = archetype::find ("empty_archetype");

/*  init_blocksview();*/
}

/*
 * Stores debug-information about how efficient the hashtable
 * used for archetypes has been in the static errmsg array.
 */

void
arch_info (object *op)
{
  sprintf (errmsg, "%d searches and %d strcmp()'s", arch_search, arch_cmp);
  new_draw_info (NDI_BLACK, 0, op, errmsg);
}

/*
 * Initialise the hashtable used by the archetypes.
 */

void
clear_archetable (void)
{
  memset ((void *) arch_table, 0, ARCHTABLE * sizeof (archetype *));
}

/*
 * An alternative way to init the hashtable which is slower, but _works_...
 */

void
init_archetable (void)
{
  archetype *at;

  LOG (llevDebug, " Setting up archetable...\n");

  for (at = first_archetype; at != NULL; at = (at->more == NULL) ? at->next : at->more)
    at->hash_add ();

  LOG (llevDebug, "done\n");
}

void
free_all_archs (void)
{
  archetype *at, *next;
  int i = 0, f = 0;

  for (at = first_archetype; at != NULL; at = next)
    {
      if (at->more)
        next = at->more;
      else
        next = at->next;

      delete
        at;

      i++;
    }

  LOG (llevDebug, "Freed %d archetypes, %d faces\n", i, f);
}

archetype::archetype ()
{
  CLEAR_FLAG (&clone, FLAG_FREED);      /* This shouldn't matter, since copy_to */
  SET_FLAG (&clone, FLAG_REMOVED);      /* doesn't copy these flags... */
}

archetype::~archetype ()
{
}

/*
 * Reads/parses the archetype-file, and copies into a linked list
 * of archetype-structures.
 */
void
first_arch_pass (object_thawer & fp)
{
  archetype *head = 0, *last_more = 0;

  archetype *at = new archetype;
  at->clone.arch = first_archetype = at;

  while (int i = load_object (fp, &at->clone, 0))
    {
      at->clone.speed_left = (float) (-0.1);
      /* copy the body_info to the body_used - this is only really
       * need for monsters, but doesn't hurt to do it for everything.
       * by doing so, when a monster is created, it has good starting
       * values for the body_used info, so when items are created 
       * for it, they can be properly equipped.
       */
      memcpy (&at->clone.body_used, &at->clone.body_info, sizeof (at->clone.body_info));

      switch (i)
        {
            case LL_NORMAL:    /* A new archetype, just link it with the previous */
              if (last_more != NULL)
                last_more->next = at;
              if (head != NULL)
                head->next = at;
              head = last_more = at;
#if 0
              if (!op->type)
                LOG (llevDebug, " WARNING: Archetype %s has no type info!\n", op->arch->name);
#endif
              at->tail_x = 0;
              at->tail_y = 0;
              break;

            case LL_MORE:      /* Another part of the previous archetype, link it correctly */

              at->head = head;
              at->clone.head = &head->clone;
              if (last_more != NULL)
                {
                  last_more->more = at;
                  last_more->clone.more = &at->clone;
                }
              last_more = at;

              /* If this multipart image is still composed of individual small
               * images, don't set the tail_.. values.  We can't use them anyways,
               * and setting these to zero makes the map sending to the client much
               * easier as just looking at the head, we know what to do.
               */
              if (at->clone.face != head->clone.face)
                {
                  head->tail_x = 0;
                  head->tail_y = 0;
                }
              else
                {
                  if (at->clone.x > head->tail_x)
                    head->tail_x = at->clone.x;
                  if (at->clone.y > head->tail_y)
                    head->tail_y = at->clone.y;
                }
              break;

        }

      at = new archetype;

      at->clone.arch = at;
    }

  delete at;
}

/*
 * Reads the archetype file once more, and links all pointers between
 * archetypes.
 */

void
second_arch_pass (object_thawer & thawer)
{
  char buf[MAX_BUF], *variable = buf, *argument, *cp;
  archetype *at = NULL, *other;

  while (fgets (buf, MAX_BUF, thawer) != NULL)
    {
      if (*buf == '#')
        continue;
      if ((argument = strchr (buf, ' ')) != NULL)
        {
          *argument = '\0', argument++;
          cp = argument + strlen (argument) - 1;
          while (isspace (*cp))
            {
              *cp = '\0';
              cp--;
            }
        }
      if (!strcmp ("Object", variable))
        {
          if ((at = archetype::find (argument)) == NULL)
            LOG (llevError, "Warning: failed to find arch %s\n", argument);
        }
      else if (!strcmp ("other_arch", variable))
        {
          if (at != NULL && at->clone.other_arch == NULL)
            {
              if ((other = archetype::find (argument)) == NULL)
                LOG (llevError, "Warning: failed to find other_arch %s\n", argument);
              else if (at != NULL)
                at->clone.other_arch = other;
            }
        }
      else if (!strcmp ("randomitems", variable))
        {
          if (at != NULL)
            {
              treasurelist *tl = find_treasurelist (argument);

              if (tl == NULL)
                LOG (llevError, "Failed to link treasure to arch (%s): %s\n", &at->name, argument);
              else
                at->clone.randomitems = tl;
            }
        }
    }
}

#ifdef DEBUG
void
check_generators (void)
{
  archetype *at;

  for (at = first_archetype; at != NULL; at = at->next)
    if (QUERY_FLAG (&at->clone, FLAG_GENERATOR) && at->clone.other_arch == NULL)
      LOG (llevError, "Warning: %s is generator but lacks other_arch.\n", &at->name);
}
#endif

/*
 * First initialises the archtype hash-table (init_archetable()).
 * Reads and parses the archetype file (with the first and second-pass
 * functions).
 * Then initialises treasures by calling load_treasures().
 */

void
load_archetypes (void)
{
  char filename[MAX_BUF];

  sprintf (filename, "%s/%s", settings.datadir, settings.archetypes);
  LOG (llevDebug, "Reading archetypes from %s:\n", filename);

  {
    object_thawer
    thawer (filename);

    clear_archetable ();
    LOG (llevDebug, " arch-pass 1...\n");
    first_arch_pass (thawer);
    LOG (llevDebug, " done\n");
  }

  init_archetable ();
  warn_archetypes = 1;

  {
    object_thawer
    thawer (filename);

    LOG (llevDebug, " loading treasure...\n");
    load_treasures ();
    LOG (llevDebug, " done\n");
    LOG (llevDebug, " arch-pass 2...\n");
    second_arch_pass (thawer);
    LOG (llevDebug, " done\n");
#ifdef DEBUG
    check_generators ();
#endif
  }
  LOG (llevDebug, " done\n");
}

/*
 * Creates and returns a new object which is a copy of the given archetype.
 * This function returns NULL on failure.
 */
object *
arch_to_object (archetype *at)
{
  object *op;

  if (at == NULL)
    {
      if (warn_archetypes)
        LOG (llevError, "Couldn't find archetype.\n");

      return NULL;
    }

  op = at->clone.clone ();
  op->arch = at;
  op->instantiate ();
  return op;
}

/*
 * Creates an object.  This function is called by get_archetype()
 * if it fails to find the appropriate archetype.
 * Thus get_archetype() will be guaranteed to always return
 * an object, and never NULL.
 */
object *
create_singularity (const char *name)
{
  object *op;
  char buf[MAX_BUF];

  sprintf (buf, "%s (%s)", ARCH_SINGULARITY, name);
  op = object::create ();
  op->name = op->name_pl = buf;
  SET_FLAG (op, FLAG_NO_PICK);
  return op;
}

/*
 * Finds which archetype matches the given name, and returns a new
 * object containing a copy of the archetype.
 */
object *
get_archetype (const char *name)
{
  archetype *at = archetype::find (name);

  if (!at)
    return create_singularity (name);

  return arch_to_object (at);
}

/*
 * Hash-function used by the arch-hashtable.
 */

unsigned long
hasharch (const char *str, int tablesize)
{
  unsigned long hash = 0;
  unsigned int i = 0;
  const char *p;

  /* use the one-at-a-time hash function, which supposedly is
   * better than the djb2-like one used by perl5.005, but
   * certainly is better then the bug used here before.
   * see http://burtleburtle.net/bob/hash/doobs.html
   */
  for (p = str; i < MAXSTRING && *p; p++, i++)
    {
      hash += *p;
      hash += hash << 10;
      hash ^= hash >> 6;
    }

  hash += hash << 3;
  hash ^= hash >> 11;
  hash += hash << 15;

  return hash % tablesize;
}

/*
 * Finds, using the hashtable, which archetype matches the given name.
 * returns a pointer to the found archetype, otherwise NULL.
 */

archetype *
archetype::find (const char *name)
{
  if (!name)
    return 0;

#if USE_UNORDERED_MAP
  AUTODECL (i, ht.find ((size_t) name));

  if (i == ht.end ())
    return 0;
  else
    return i->second;
#endif

  archetype *at;
  unsigned long index;

  index = hasharch (name, ARCHTABLE);
  arch_search++;
  for (;;)
    {
      at = arch_table[index];

      if (at == NULL)
        {
          if (warn_archetypes)
            LOG (llevError, "Couldn't find archetype %s\n", name);

          return NULL;
        }

      arch_cmp++;

      if (!strcmp ((const char *) at->name, name))
        return at;

      if (++index >= ARCHTABLE)
        index = 0;
    }
}

/*
 * Adds an archetype to the hashtable.
 */
void
archetype::hash_add ()
{
#if USE_UNORDERED_MAP
  ht.insert (std::make_pair ((size_t) (const char *) name, this));
#else

  int index = hasharch ((const char *) name, ARCHTABLE), org_index = index;

  for (;;)
    {
      if (!arch_table[index])
        {
          arch_table[index] = this;
          break;
        }

      if (++index == ARCHTABLE)
        index = 0;

      if (index == org_index)
        fatal (ARCHTABLE_TOO_SMALL);
    }
#endif
}

void
archetype::hash_del ()
{
#if USE_UNORDERED_MAP
# error remove this from HT
#else

  int index = hasharch ((const char *) name, ARCHTABLE), org_index = index;

  for (;;)
    {
      if (arch_table[index] == this)
        {
          arch_table[index] = 0;
          break;
        }

      if (++index == ARCHTABLE)
        index = 0;

      if (index == org_index)
        break;
    }
#endif
}

/*
 * Returns the first archetype using the given type.
 * Used in treasure-generation.
 */

archetype *
type_to_archetype (int type)
{
  archetype *at;

  for (at = first_archetype; at; at = at->more == 0 ? at->next : at->more)
    if (at->clone.type == type)
      return at;

  return 0;
}

/*
 * Returns a new object copied from the first archetype matching
 * the given type.
 * Used in treasure-generation.
 */

object *
clone_arch (int type)
{
  archetype *at;

  if ((at = type_to_archetype (type)) == NULL)
    {
      LOG (llevError, "Can't clone archetype %d\n", type);
      return 0;
    }

  object *op = at->clone.clone ();
  op->instantiate ();
  return op;
}

/*
 * member: make instance from class
 */

object *
object_create_arch (archetype *at)
{
  object *op, *prev = 0, *head = 0;

  while (at)
    {
      op = arch_to_object (at);
      op->x = at->clone.x;
      op->y = at->clone.y;

      if (head)
        op->head = head, prev->more = op;

      if (!head)
        head = op;

      prev = op;
      at = at->more;
    }

  return (head);
}