server/server/shop.C

/*
 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Crossfire TRT 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 <crossfire@schmorp.de>
 */

#include <global.h>
#include <spells.h>
#include <skills.h>
#include <living.h>
#include <sproto.h>
#include <math.h>

/* this is a measure of how effective store specialisation is. A general store
 * will offer this proportion of the 'maximum' price, a specialised store will
 * offer a range of prices around it such that the maximum price is always one
 * therefore making this number higher, makes specialisation less effective. 
 * setting this value above 1 or to a negative value would have interesting,
 * (though not useful) effects.
 */
#define SPECIALISATION_EFFECT 0.5

/* price a shopkeeper will give someone they neither like nor dislike */
#define NEUTRAL_RATIO 0.8

static void pay_from_container (object *pl, object *pouch, sint64 &to_pay);
static sint64 value_limit (sint64 val, int quantity, const object *who, int isshop);
static double shop_specialisation_ratio (const object *item, const maptile *map);
static double shop_greed (const maptile *map);

#define NUM_COINS 4             /* number of coin types */
static const char *const coins[] = { "royalty", "platinacoin", "goldcoin", "silvercoin", NULL };

/* Added F_TRUE flag to define.h to mean that the price should not
 * be adjusted by players charisma. With F_TRUE, it returns the amount
 * that the item is worth, if it was sold, but unadjusted by charisma.
 * This is needed for alchemy, to to determine what value of gold nuggets
 * should be given (the gold nuggets, when sold, will have the adjustment
 * by charisma done at that time).  NULL could have been passed as the
 * who parameter, but then the adjustment for expensive items (>10000)
 * would not be done.
 *
 * Added F_APPROX flag, which means that the price returned should be wrong by
 * an amount related to the player's bargaining skill.
 *
 * Added F_SHOP flag to mean that the specialisation of the shop on the player's 
 * current map should be taken into account when determining the price. Shops that
 * specialise in what is being traded will give better prices than those that do not. 
 *
 * CF 0.91.4 - This function got changed around a bit.  Now the
 * number of object is multiplied by the value early on.  This fixes problems
 * with items worth very little.  What happened before is that various
 * divisions took place, the value got rounded to 0 (Being an int), and
 * thus remained 0.
 *
 * Mark Wedel (mwedel@pyramid.com)
 */

static sint64 approx_range;

sint64
query_cost (const object *tmp, object *who, int flag)
{
  double val;
  int number;                   /* used to better calculate value */
  int no_bargain;
  int identified;
  int not_cursed;
  int approximate;
  int shop;
  double diff;

  approx_range = 0;

  no_bargain = flag & F_NO_BARGAIN;
  identified = flag & F_IDENTIFIED;
  not_cursed = flag & F_NOT_CURSED;
  approximate = flag & F_APPROX;
  shop = flag & F_SHOP;
  flag &= ~(F_NO_BARGAIN | F_IDENTIFIED | F_NOT_CURSED | F_APPROX | F_SHOP);

  if (tmp->type == MONEY)
    return tmp->nrof * tmp->value;

  if (tmp->type == GEM)
    {
      if (flag == F_TRUE)
        return (tmp->nrof * tmp->value);

      if (flag == F_BUY)
        return (sint64) (1.03 * tmp->nrof * tmp->value);

      if (flag == F_SELL)
        return (sint64) (0.97 * tmp->nrof * tmp->value);

      LOG (llevError, "Query_cost: Gem type with unknown flag %d: %s\n", flag, tmp->debug_desc ());
      return 0;
    }

  number = tmp->nrof;
  if (number == 0)
    number = 1;
  if (QUERY_FLAG (tmp, FLAG_IDENTIFIED) || !need_identify (tmp) || identified)
    {
      if (!not_cursed && (QUERY_FLAG (tmp, FLAG_CURSED) || QUERY_FLAG (tmp, FLAG_DAMNED)))
        return 0;
      else
        val = tmp->value * number;
    }
  /* This area deals with objects that are not identified, but can be */
  else
    {
      if (tmp->arch != NULL)
        {
          if (flag == F_BUY)
            {
              LOG (llevError, "Asking for buy-value of unidentified object.\n");
              val = tmp->arch->value * 50 * number;
            }
          else
            {                   /* Trying to sell something, or get true value */
              if (tmp->type == POTION)
                val = number * 40;      /* Don't want to give anything away */
              else
                {
                  /* Get 2/3'rd value for applied objects, 1/3'rd for totally
                   * unknown objects
                   */
                  if (QUERY_FLAG (tmp, FLAG_BEEN_APPLIED))
                    val = number * tmp->arch->value * 2 / 3;
                  else
                    val = number * tmp->arch->value / 3;
                }
            }
        }
      else
        {                       /* No archetype with this object */
          LOG (llevDebug, "In sell item: Have object with no archetype: %s\n", &tmp->name);
          if (flag == F_BUY)
            {
              LOG (llevError, "Asking for buy-value of unidentified object without arch.\n");
              val = number * tmp->value * 10;
            }
          else
            val = number * tmp->value / 5;
        }
    }

  /* If the item has been applied or identifed or does not need to be
   * identified, AND the object is magical and the archetype is non
   * magical, then change values accordingly.  The tmp->arch==NULL is
   * really just a check to prevent core dumps for when it checks
   * tmp->arch->magic for any magic.  The check for archetype
   * magic is to not give extra money for archetypes that are by
   * default magical.  This is because the archetype value should have
   * already figured in that value.
   */
  if ((QUERY_FLAG (tmp, FLAG_IDENTIFIED) || !need_identify (tmp) || identified ||
       QUERY_FLAG (tmp, FLAG_BEEN_APPLIED)) && tmp->magic && (tmp->arch == NULL || !tmp->arch->magic))
    {
      if (tmp->magic > 0)
        val *= (3 * tmp->magic * tmp->magic * tmp->magic);
      else
        /* Note that tmp->magic is negative, so that this
         * will actually be something like val /=2, /=3, etc.
         */
        val /= (1 - tmp->magic);
    }

  if (tmp->type == WAND)
    {
      /* Value of the wand is multiplied by the number of
       * charges.  the treasure code already sets up the value
       * 50 charges is used as the baseline.
       */
      if (QUERY_FLAG (tmp, FLAG_IDENTIFIED) || !need_identify (tmp) || identified)
        val = (val * tmp->stats.food) / 50;
      else                      /* if not identified, presume one charge */
        val /= 50;
    }

  /* Limit amount of money you can get for really great items. */
  if (flag == F_SELL)
    val = value_limit ((sint64) val, number, who, shop);

  // use a nonlinear price adjustment. as my predecessor said, don't change
  // the archetypes, its work required for balancing, and we don't care.
  //val = pow (val, 1.05);

  /* This modification is for bargaining skill.
   * Now only players with max level in bargaining
   * AND Cha = 30 will get optimal price.
   * Thus charisma will never get useless.
   * -b.e. edler@heydernet.de
   */

  if (who != NULL && who->type == PLAYER)
    {
      int lev_bargain = 0;
      int lev_identify = 0;
      int idskill1 = 0;
      int idskill2 = 0;
      const typedata *tmptype;

      tmptype = get_typedata (tmp->type);

      if (find_skill_by_number (who, SK_BARGAINING))
        lev_bargain = find_skill_by_number (who, SK_BARGAINING)->level;

      if (tmptype)
        {
          idskill1 = tmptype->identifyskill;

          if (idskill1)
            {
              idskill2 = tmptype->identifyskill2;

              if (find_skill_by_number (who, idskill1))
                lev_identify = find_skill_by_number (who, idskill1)->level;

              if (idskill2 && find_skill_by_number (who, idskill2))
                lev_identify += find_skill_by_number (who, idskill2)->level;
            }
        }
      else
        LOG (llevError, "Query_cost: item %s hasn't got a valid type\n", tmp->debug_desc ());

      /* ratio determines how much of the price modification
       * will come from the basic stat charisma
       * the rest will come from the level in bargaining skill
       */
      const double cha_ratio = 0.40;

      diff = no_bargain ? 1.0 : 1. - pow (lev_bargain / (double) settings.max_level, 0.25);
      diff = (1. - cha_ratio) * diff + cha_ratio * (cha_bonus[who->stats.Cha] - 1.) / (cha_bonus[who->stats.Cha] + 1.);
      diff = .02 + (.80 - .02) * diff;

      if (flag == F_BUY)
        val += val * diff;
      else if (flag == F_SELL)
        val -= val * diff;

      // now find a price range. the less good we can judge, the larger the range is
      // then the range is adjusted randomly around the correct value
      if (approximate)
        approx_range = sint64 (val / sqrt (lev_identify * 3 + 1));
    }

  /* I don't think this should really happen - if it does, it indicates and
   * overflow of diff above.  That should only happen if
   * we are selling objects - in that case, the person just
   * gets no money.
   */
  if ((sint64) val < 0)
    val = 0;

  /* Unidentified stuff won't sell for more than 60gp */
  if (flag == F_SELL && !QUERY_FLAG (tmp, FLAG_IDENTIFIED) && need_identify (tmp) && !identified)
    {
      val = (val > 600) ? 600 : val;
    }

  /* if we are in a shop, check how the type of shop should affect the price */
  if (shop && who)
    {
      if (flag == F_SELL)
        val = (val * shop_specialisation_ratio (tmp, who->map) * shopkeeper_approval (who->map, who) / shop_greed (who->map));
      else if (flag == F_BUY)
        {
          /* 
           * when buying, if the item was sold by another player, it is ok to
           * let the item be sold cheaper, according to the specialisation of
           * the shop. If a player sold an item here, then his sale price was
           * multiplied by the specialisation ratio, to do the same to the buy 
           * price will not generate extra money. However, the 
           * same is not true of generated items, these have to /divide/ by the 
           * specialisation, so that the price is never less than what they could
           * be sold for (otherwise players could camp map resets to make money).
           * In game terms, a non-specialist shop, might not recognise the true 
           * value of the items they sell (much like how people sometimes find 
           * antiques in a junk shop in real life).
           */
          if (QUERY_FLAG (tmp, FLAG_PLAYER_SOLD))
            val = (val * shop_greed (who->map) * shop_specialisation_ratio (tmp, who->map) / shopkeeper_approval (who->map, who));
          else
            val = (val * shop_greed (who->map) / (shop_specialisation_ratio (tmp, who->map) * shopkeeper_approval (who->map, who)));
        }

      /* we will also have an extra 0-5% variation between shops of the same type 
       * for valuable items (below a value of 50 this effect wouldn't be very 
       * pointful, and could give fun with rounding.
       */
      //TODO: why use cosf at all, just % and scale linearly, gives more even distribution
      if (val > 50)
        val += float (val) * .05f * cosf ((tmp->uuid.seq & 0xffff) * float (M_PI * 2. / 0x10000));
    }

  return (sint64) val;
}

/* Find the coin type that is worth more the 'c'.  Starts at the
 * cointype placement.
 */

static archetype *
find_next_coin (sint64 c, int *cointype)
{
  archetype *coin;

  do
    {
      if (coins[*cointype] == NULL)
        return NULL;
      coin = archetype::find (coins[*cointype]);
      if (coin == NULL)
        return NULL;
      *cointype += 1;
    }
  while (coin->value > c);

  return coin;
}

/* This returns a string of how much something is worth based on
 * an integer being passed.
 * cost is the cost we need to represent.
 * While cost is 64 bit, the number of any coin is still really
 * limited to 32 bit (size of nrof field).  If it turns out players
 * have so much money that they have more than 2 billion platinum
 * coins, there are certainly issues - the easiest fix at that
 * time is to add a higher denomination (mithril piece with
 * 10,000 silver or something)
 */
const char *
cost_string_from_value (sint64 cost, int approx)
{
  static char buf[MAX_BUF];
  archetype *coin, *next_coin;
  int num, cointype = 0;

  coin = find_next_coin (cost, &cointype);
  if (coin == NULL)
    return "nothing";

  num = cost / coin->value;
  /* so long as nrof is 32 bit, this is true.
   * If it takes more coins than a person can possibly carry, this
   * is basically true.
   */
  if ((cost / coin->value) > UINT32_MAX)
    {
      strcpy (buf, "an unimaginable sum of money");
      return buf;
    }

  cost -= num * (sint64)coin->value;

  sprintf (buf, "%d %s", num, num > 1 ? &coin->object::name_pl : &coin->object::name);

  next_coin = find_next_coin (cost, &cointype);
  if (next_coin == NULL || approx)
    return buf;

  coin = next_coin;
  num = cost / coin->value;
  cost -= num * (sint64)coin->value;

  sprintf (buf + strlen (buf), " and %d %s", num, num > 1 ? &coin->object::name_pl : &coin->object::name);

  return buf;
}

const char *
query_cost_string (const object *tmp, object *who, int flag)
{
  sint64 real_value = query_cost (tmp, who, flag);
  int idskill1 = 0;
  int idskill2 = 0;
  const typedata *tmptype;

  tmptype = get_typedata (tmp->type);
  if (tmptype)
    {
      idskill1 = tmptype->identifyskill;
      idskill2 = tmptype->identifyskill2;
    }

  /* we show an approximate price if
   * 1) we are approximating
   * 2) there either is no id skill(s) for the item, or we don't have them
   * 3) we don't have bargaining skill either
   */
  if (flag & F_APPROX)
    {
      if (!idskill1 || !find_skill_by_number (who, idskill1))
        {
          if (!idskill2 || !find_skill_by_number (who, idskill2))
            {
              if (!find_skill_by_number (who, SK_BARGAINING))
                {
                  static char buf[MAX_BUF];
                  int num, cointype = 0;
                  archetype *coin = find_next_coin (real_value, &cointype);

                  if (coin == NULL)
                    return "nothing";

                  num = real_value / coin->value;
                  if (num == 1)
                    sprintf (buf, "about one %s", &coin->object::name);
                  else if (num < 5)
                    sprintf (buf, "a few %s", &coin->object::name_pl);
                  else if (num < 10)
                    sprintf (buf, "several %s", &coin->object::name_pl);
                  else if (num < 25)
                    sprintf (buf, "a moderate amount of %s", &coin->object::name_pl);
                  else if (num < 100)
                    sprintf (buf, "lots of %s", &coin->object::name_pl);
                  else if (num < 1000)
                    sprintf (buf, "a great many %s", &coin->object::name_pl);
                  else
                    sprintf (buf, "a vast quantity of %s", &coin->object::name_pl);
                  return buf;
                }
            }
        }

      int hash = ((unsigned int) tmp->count * 174364621) & 1023;

      if (approx_range)
        {
          sint64 lo = (sint64) real_value - (approx_range * hash >> 10);
          static char buf[MAX_BUF];

          sprintf (buf, "between %s", cost_string_from_value (lo, 1));
          sprintf (buf + strlen (buf), " and %s", cost_string_from_value (lo + approx_range, 1));

          return buf;
        }
    }

  return cost_string_from_value (real_value, 0);
}

/* This function finds out how much money the player is carrying,
 * including what is in containers.
 */
sint64
query_money (const object *op)
{
  object *tmp;
  sint64 total = 0;

  if (op->type != PLAYER && op->type != CONTAINER)
    {
      LOG (llevError, "Query money called with non player/container\n");
      return 0;
    }

  for (tmp = op->inv; tmp; tmp = tmp->below)
    if (tmp->type == MONEY)
      total += tmp->nrof * (sint64)tmp->value;
    else if (tmp->type == CONTAINER && QUERY_FLAG (tmp, FLAG_APPLIED) && (tmp->race == NULL || strstr (tmp->race, "gold")))
      total += query_money (tmp);

  return total;
}

/* TCHIZE: This function takes the amount of money from the
 * the player inventory and from it's various pouches using the
 * pay_from_container function.
 * returns 0 if not possible. 1 if success
 */
int
pay_for_amount (sint64 to_pay, object *pl)
{
  object *pouch;

  if (to_pay == 0)
    return 1;

  if (to_pay > query_money (pl))
    return 0;

  pay_from_container (pl, pl, to_pay);

  for (pouch = pl->inv; pouch && to_pay; pouch = pouch->below)
    if (pouch->type == CONTAINER && QUERY_FLAG (pouch, FLAG_APPLIED) && (pouch->race == NULL || strstr (pouch->race, "gold")))
      pay_from_container (pl, pouch, to_pay);

  pl->update_stats ();
  return 1;
}

/* DAMN: This is now a wrapper for pay_from_container, which is
 * called for the player, then for each active container that can hold
 * money until op is paid for.  Change will be left wherever the last
 * of the price was paid from.
 */
int
pay_for_item (object *op, object *pl)
{
  sint64 to_pay = query_cost (op, pl, F_BUY | F_SHOP);
  object *pouch;
  sint64 saved_money;

  if (to_pay == 0)
    return 1;

  if (to_pay > query_money (pl))
    return 0;

  /* We compare the paid price with the one for a player
   * without bargaining skill.
   * This determins the amount of exp (if any) gained for bargaining.
   */
  saved_money = query_cost (op, pl, F_BUY | F_NO_BARGAIN | F_SHOP) - to_pay;

  if (saved_money > 0)
    change_exp (pl, saved_money, "bargaining", SK_EXP_NONE);

  pay_from_container (pl, pl, to_pay);

  for (pouch = pl->inv; pouch && to_pay; pouch = pouch->below)
    if (pouch->type == CONTAINER && QUERY_FLAG (pouch, FLAG_APPLIED) && (pouch->race == NULL || strstr (pouch->race, "gold")))
      pay_from_container (pl, pouch, to_pay);

  pl->update_stats ();

  return 1;
}

/* This pays for the item, and takes the proper amount of money off
 * the player.
 * CF 0.91.4 - this function is mostly redone in order to fix a bug
 * with weight not be subtracted properly.  We now remove and
 * insert the coin objects -  this should update the weight
 * appropriately
 *
 * DAMN: This function is used for the player, then for any active
 * containers that can hold money.
 *
 * pouch is the container (pouch or player) to remove the coins from.
 * to_pay is the required amount.
 * returns the amount still missing after using "pouch".
 */
static void
pay_from_container (object *pl, object *pouch, sint64 &to_pay)
{
  int count, i;
  object *tmp, *next;
  archetype *at;

  if (pouch->type != PLAYER && pouch->type != CONTAINER)
    return;

  object *coin_objs[NUM_COINS] = { 0 };

  /* This hunk should remove all the money objects from the player/container */
  for (tmp = pouch->inv; tmp; tmp = next)
    {
      next = tmp->below;

      if (tmp->type == MONEY)
        {
          for (i = 0; i < NUM_COINS; i++)
            {
              if (tmp->value == tmp->arch->value && !strcmp (coins[NUM_COINS - 1 - i], tmp->arch->archname))
                {
                  // This should not happen, but if it does, just merge the two.
                  if (coin_objs [i])
                    {
                      LOG (llevError, "%s has two money entries of (%s)\n", &pouch->name, coins[NUM_COINS - 1 - i]);
                      tmp->remove ();
                      coin_objs[i]->nrof += tmp->nrof;
                      esrv_del_item (pl->contr, tmp->count);
                      tmp->destroy ();
                    }
                  else
                    {
                      tmp->remove ();

                      if (pouch->type == PLAYER)
                        esrv_del_item (pl->contr, tmp->count);

                      coin_objs[i] = tmp;
                    }

                  break;
                }
            }

          if (i == NUM_COINS)
            LOG (llevError, "in pay_for_item: Did not find string match for %s\n", &tmp->arch->archname);
        }
    }

  /* Fill in any gaps in the coin_objs array - needed to make change. */
  /* Note that the coin_objs array goes from least value to greatest value */
  for (i = 0; i < NUM_COINS; i++)
    if (!coin_objs[i])
      {
        at = archetype::find (coins[NUM_COINS - 1 - i]);

        if (at == NULL)
          LOG (llevError, "Could not find %s archetype\n", coins[NUM_COINS - 1 - i]);

        coin_objs[i] = arch_to_object (at);
        coin_objs[i]->nrof = 0;
      }

  for (i = 0; i < NUM_COINS; i++)
    {
      object &coin = *coin_objs[i];
      sint64 num_coins = min ((to_pay + coin.value - 1) / coin.value, coin.nrof);
      to_pay -= num_coins * coin.value;

      coin.nrof -= num_coins;
      /* Now start making change.  Start at the coin value
       * below the one we just did, and work down to
       * the lowest value.
       */
      count = i - 1;

      while (to_pay < 0 && count >= 0)
        {
          num_coins = (-to_pay) / coin_objs[count]->value;
          coin_objs[count]->nrof += num_coins;
          to_pay += num_coins * coin_objs[count]->value;
          count--;
        }
    }

  for (i = 0; i < NUM_COINS; i++)
    {
      if (coin_objs[i]->nrof)
        {
          object *tmp = insert_ob_in_ob (coin_objs[i], pouch);

          esrv_send_item (pl, tmp);
          esrv_send_item (pl, pouch);

          if (pl != pouch)
            esrv_update_item (UPD_WEIGHT, pl, pouch);

          if (pl->type != PLAYER)
            esrv_send_item (pl, pl);
        }
      else
        coin_objs[i]->destroy ();
    }
}

/* Checks all unpaid items in op's inventory, adds up all the money they
 * have, and checks that they can actually afford what they want to buy.
 * Returns 1 if they can, and 0 if they can't. also prints an appropriate message 
 * to the player
 */
int
can_pay (object *pl)
{
  int unpaid_count = 0;
  sint64 unpaid_price = 0;
  sint64 player_wealth = query_money (pl);

  if (!pl || pl->type != PLAYER)
    {
      LOG (llevError, "can_pay(): called against something that isn't a player\n");
      return 0;
    }

  for (object::depth_iterator item = pl->begin (); item != pl->end (); ++item)
    if (QUERY_FLAG (item, FLAG_UNPAID))
      {
        unpaid_count++;
        unpaid_price += query_cost (item, pl, F_BUY | F_SHOP);
      }

  if (unpaid_price > player_wealth)
    {
      char buf[MAX_BUF];
      char cost[MAX_BUF];
      char missing[MAX_BUF];

      snprintf (cost, MAX_BUF, "%s", cost_string_from_value (unpaid_price, 0));
      snprintf (missing, MAX_BUF, "%s", cost_string_from_value (unpaid_price - player_wealth, 0));

      snprintf (buf, MAX_BUF, "You have %d unpaid items that would cost you %s. You need another %s to be able to afford that.",
                unpaid_count, cost, missing);
      new_draw_info (NDI_UNIQUE, 0, pl, buf);

      return 0;
    }
  else
    return 1;
}

/* Better get_payment, descends containers looking for
 * unpaid items, and pays for them.
 * returns 0 if the player still has unpaid items.
 * returns 1 if the player has paid for everything.
 * pl is the player buying the stuff.
 */
int
get_payment (object *pl)
{
  for (;;)
    {
      next_item:

      for (object::depth_iterator op = pl->begin (); op != pl->end (); ++op)
        {
          if (QUERY_FLAG (op, FLAG_UNPAID))
            {
              char buf[MAX_BUF];
              snprintf (buf, MAX_BUF, "%s", query_cost_string (op, pl, F_BUY | F_SHOP));

              if (!pay_for_item (op, pl))
                {
                  sint64 i = query_cost (op, pl, F_BUY | F_SHOP) - query_money (pl);

                  CLEAR_FLAG (op, FLAG_UNPAID);
                  new_draw_info_format (NDI_UNIQUE, 0, pl, "You lack %s to buy %s.", cost_string_from_value (i, 0), query_name (op));
                  SET_FLAG (op, FLAG_UNPAID);
                  return 0;
                }
              else
                {
                  object *tmp;

                  CLEAR_FLAG (op, FLAG_UNPAID);
                  CLEAR_FLAG (op, FLAG_PLAYER_SOLD);
                  new_draw_info_format (NDI_UNIQUE, 0, op, "You paid %s for %s.", buf, query_name (op));
                  tmp = merge_ob (op, NULL);

                  if (pl->type == PLAYER)
                    {
                      if (tmp)
                        {               /* it was merged */
                          esrv_del_item (pl->contr, op->count);
                          op = tmp;
                        }

                      esrv_send_item (pl, op);
                    }

                  goto next_item;
                }
            }
        }

      return 1;
    }
}

/* written by elmex:
 * moved this code from sell_item () here to have a function
 * that pays the player an amount. Mainly put the code here to
 * be able to call it from a plugin.
 *
 * If the player can't carry all the money that is paid, it gets inserted
 * in his inventory anyway. This is the best alternative to not pay any money
 * or put it on the ground under the player. This way the player can still
 * go somewhere and unload the money at a safe place.
 *
 */
void
pay_player (object *pl, sint64 amount)
{
  int count = 0;
  archetype *at = 0;
  object *pouch = 0, *tmp = 0;

  for (count = 0; coins[count] != NULL; count++)
    {
      at = archetype::find (coins[count]);

      if (at == NULL)
        LOG (llevError, "Could not find %s archetype\n", coins[count]);
      else if ((amount / at->value) > 0)
        {
          for (pouch = pl->inv; pouch; pouch = pouch->below)
            {
              if (pouch->type == CONTAINER && QUERY_FLAG (pouch, FLAG_APPLIED) && pouch->race && strstr (pouch->race, "gold"))
                {
                  int w = at->weight * (100 - pouch->stats.Str) / 100;
                  int n = amount / at->value;

                  if (w == 0)
                    w = 1;      /* Prevent divide by zero */

                  if (n > 0 && (!pouch->weight_limit || pouch->carrying + w <= pouch->weight_limit))
                    {
                      if (pouch->weight_limit && (pouch->weight_limit - pouch->carrying) / w < n)
                        n = (pouch->weight_limit - pouch->carrying) / w;

                      tmp = arch_to_object (at);
                      tmp->nrof = n;
                      amount -= tmp->nrof * tmp->value;
                      tmp = insert_ob_in_ob (tmp, pouch);
                      esrv_send_item (pl, tmp);
                      esrv_send_item (pl, pouch);
                      esrv_update_item (UPD_WEIGHT, pl, pouch);
                      esrv_send_item (pl, pl);
                    }
                }
            }

          if (amount / at->value > 0)
            {
              tmp = arch_to_object (at);
              tmp->nrof = amount / tmp->value;
              amount -= tmp->nrof * tmp->value;
              tmp = insert_ob_in_ob (tmp, pl);
              esrv_send_item (pl, tmp);
              esrv_send_item (pl, pl);
            }
        }
    }

  if (amount != 0)
    LOG (llevError, "Warning - payment in pay_player () not zero: %llu\n", amount);
}

/* elmex: this is for the bank plugin :( */
sint64
pay_player_arch (object *pl, const char *arch, sint64 amount)
{
  archetype *at = archetype::find (arch);
  object *tmp = NULL;

  if (at == NULL)
    return 0;

  if (amount > 0)
    {
      tmp = arch_to_object (at);
      tmp->nrof = amount;
      tmp = insert_ob_in_ob (tmp, pl);
      esrv_send_item (pl, tmp);
      esrv_send_item (pl, pl);
    }

  return 1;
}

/* Modified function to give out platinum coins.  This function uses
 * the coins[] array to know what coins are available, just like
 * buy item.
 *
 * Modified to fill available race: gold containers before dumping
 * remaining coins in character's inventory.
 */
void
sell_item (object *op, object *pl)
{
  sint64 amount = query_cost (op, pl, F_SELL | F_SHOP), extra_gain;

  if (pl == NULL || pl->type != PLAYER)
    {
      LOG (llevDebug, "Object other than player tried to sell something.\n");
      return;
    }

  op->custom_name = 0;

  if (!amount)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl, "We're not interested in %s.", query_name (op));

      /* Even if the character doesn't get anything for it, it may still be
       * worth something.  If so, make it unpaid
       */
      if (op->value)
        {
          SET_FLAG (op, FLAG_UNPAID);
          SET_FLAG (op, FLAG_PLAYER_SOLD);
        }

      identify (op);
      return;
    }

  /* We compare the price with the one for a player
   * without bargaining skill.
   * This determins the amount of exp (if any) gained for bargaining.
   * exp/10 -> 1 for each gold coin
   */
  extra_gain = amount - query_cost (op, pl, F_SELL | F_NO_BARGAIN | F_SHOP);

  if (extra_gain > 0)
    change_exp (pl, extra_gain / 10, "bargaining", SK_EXP_NONE);

  pay_player (pl, amount);

  new_draw_info_format (NDI_UNIQUE, 0, pl, "You receive %s for %s.", query_cost_string (op, pl, F_SELL | F_SHOP), query_name (op));

  SET_FLAG (op, FLAG_UNPAID);
  identify (op);
}


/* returns a double that is the ratio of the price that a shop will offer for
 * item based on the shops specialisation. Does not take account of greed, 
 * returned value is between (2*SPECIALISATION_EFFECT-1) and 1 and in any 
 * event is never less than 0.1 (calling functions divide by it)
 */
static double
shop_specialisation_ratio (const object *item, const maptile *map)
{
  shopitems *items = map->shopitems;
  double ratio = SPECIALISATION_EFFECT, likedness = 0.001;
  int i;

  if (item == NULL)
    {
      LOG (llevError, "shop_specialisation_ratio: passed a NULL item for map %s\n", &map->path);
      return 0;
    }

  if (!item->type)
    {
      LOG (llevError, "shop_specialisation_ratio: passed an item with an invalid type\n");
      /* 
       * I'm not really sure what the /right/ thing to do here is, these types of 
       * item shouldn't exist anyway, but returning the ratio is probably the best bet.." 
       */
      return ratio;
    }

  if (map->shopitems)
    {
      for (i = 0; i < items[0].index; i++)
        if (items[i].typenum == item->type || (!items[i].typenum && likedness == 0.001))
          likedness = items[i].strength / 100.0;
    }

  if (likedness > 1.0)
    {                           /* someone has been rather silly with the map headers. */
      LOG (llevDebug, "shop_specialisation ratio: item type %d on map %s is above 100%%\n", item->type, &map->path);
      likedness = 1.0;
    }

  if (likedness < -1.0)
    {
      LOG (llevDebug, "shop_specialisation ratio: item type %d on map %s is below -100%%\n", item->type, &map->path);
      likedness = -1.0;
    }

  ratio = ratio + (1.0 - ratio) * likedness;

  if (ratio <= 0.1)
    ratio = 0.1;                /* if the ratio were much lower than this, we would get silly prices */

  return ratio;
}

/*returns the greed of the shop on map, or 1 if it isn't specified. */
static double
shop_greed (const maptile *map)
{
  double greed = 1.0;

  if (map->shopgreed)
    return map->shopgreed;
  return greed;
}

/* Returns a double based on how much the shopkeeper approves of the player.
 * this is based on the race of the shopkeeper and that of the player.
 */
double
shopkeeper_approval (const maptile *map, const object *player)
{
  double approval = 1.0;

  if (map->shoprace)
    {
      approval = NEUTRAL_RATIO;
      if (player->race && !strcmp (player->race, map->shoprace))
          approval = 1.0;
    }

  return approval;
}

/* limit the value of items based on the wealth of the shop. If the item is close
 * to the maximum value a shop will offer, we start to reduce it, if the item is 
 * below the minimum value the shop is prepared to trade in, then we don't 
 * want it and offer nothing. If it isn't a shop, check whether we should do generic
 * value reduction.
 * 
 */
static sint64
value_limit (sint64 val, int quantity, const object *who, int isshop)
{
  sint64 newval, unit_price, tmpshopmax;
  maptile *map;

  unit_price = val / quantity;

  if (!isshop || !who)
    {
      if (unit_price > 250000)
        newval = (sint64) (250000. - pow (250000., .75) * 65. + pow (unit_price, .75) * 65.);
      else
        newval = unit_price;
    }
  else
    {
      if (!who->map)
        {
          LOG (llevError, "value_limit: asked shop price for ob %s on NULL map\n", &who->name);
          return val;
        }

      map = who->map;

      tmpshopmax = map->shopmax ? map->shopmax : 100000;        // 20 royalties default

      if (map->shopmin && unit_price < map->shopmin)
        return 0;
      else if (unit_price > tmpshopmax / 2)
        newval = MIN ((tmpshopmax / 2) + isqrt (unit_price - tmpshopmax / 2), tmpshopmax);
      else
        newval = unit_price;
    }

  newval *= quantity;

  return newval;
}

/* gives a desciption of the shop on their current map to the player op. */
int
describe_shop (const object *op)
{
  maptile *map = op->map;

  /*shopitems *items=map->shopitems; */
  int pos = 0, i;
  double opinion = 0;
  char tmp[MAX_BUF] = "\0";

  if (op->type != PLAYER)
    return 0;

  /*check if there is a shop specified for this map */
  if (map->shopitems || map->shopgreed || map->shoprace || map->shopmin || map->shopmax)
    {
      new_draw_info (NDI_UNIQUE, 0, op, "From looking at the nearby shop you determine that it trades in:");

      if (map->shopitems)
        for (i = 0; i < map->shopitems[0].index; i++)
          if (map->shopitems[i].name && map->shopitems[i].strength > 10)
            {
              snprintf (tmp + pos, sizeof (tmp) - pos, "%s, ", map->shopitems[i].name_pl);
              pos += strlen (tmp + pos);
            }

      if (!pos)
        strcat (tmp, "a little of everything.");

      /* format the string into a list */
      make_list_like (tmp);
      new_draw_info_format (NDI_UNIQUE, 0, op, "%s", tmp);

      if (map->shopmax)
        new_draw_info_format (NDI_UNIQUE, 0, op, "It won't trade for items above %s.", cost_string_from_value (map->shopmax, 0));

      if (map->shopmin)
        new_draw_info_format (NDI_UNIQUE, 0, op, "It won't trade in items worth less than %s.", cost_string_from_value (map->shopmin, 0));

      if (map->shopgreed)
        {
          if (map->shopgreed > 2.0)
            new_draw_info (NDI_UNIQUE, 0, op, "It tends to overcharge massively.");
          else if (map->shopgreed > 1.5)
            new_draw_info (NDI_UNIQUE, 0, op, "It tends to overcharge substantially.");
          else if (map->shopgreed > 1.1)
            new_draw_info (NDI_UNIQUE, 0, op, "It tends to overcharge slightly.");
          else if (map->shopgreed < 0.9)
            new_draw_info (NDI_UNIQUE, 0, op, "It tends to undercharge.");
        }

      if (map->shoprace)
        {
          opinion = shopkeeper_approval (map, op);
          if (opinion > 0.8)
            new_draw_info (NDI_UNIQUE, 0, op, "You think the shopkeeper likes you.");
          else if (opinion > 0.5)
            new_draw_info (NDI_UNIQUE, 0, op, "The shopkeeper seems unconcerned by you.");
          else
            new_draw_info (NDI_UNIQUE, 0, op, "The shopkeeper seems to have taken a dislike to you.");
        }
    }
  else
    new_draw_info (NDI_UNIQUE, 0, op, "There is no shop nearby.");

  return 1;
}

struct shopinv
{
  char *item_sort;
  char *item_real;
  uint16 type;
  uint32 nrof;
};

/* There are a lot fo extra casts in here just to suppress warnings - it
 * makes it look uglier than it really it.
 * The format of the strings we get is type:name.  So we first want to
 * sort by type (numerical) - if the same type, then sort by name.
 */
static int
shop_sort (const void *a1, const void *a2)
{
  shopinv *s1 = (shopinv *) a1, *s2 = (shopinv *) a2;

  if (s1->type < s2->type)
    return -1;
  if (s1->type > s2->type)
    return 1;

  /* the type is the same (what atoi gets), so do a strcasecmp to sort
   * via alphabetical order
   */
  return strcasecmp (s1->item_sort, s2->item_sort);
}

static void
add_shop_item (object *tmp, shopinv * items, int *numitems, int *numallocated)
{
#if 0
  char buf[MAX_BUF];
#endif
  /* clear unpaid flag so that doesn't come up in query
   * string.  We clear nrof so that we can better sort
   * the object names.
   */

  CLEAR_FLAG (tmp, FLAG_UNPAID);
  items[*numitems].nrof = tmp->nrof;
  /* Non mergable items have nrof of 0, but count them as one
   * so the display is properly.
   */
  if (tmp->nrof == 0)
    items[*numitems].nrof++;
  items[*numitems].type = tmp->type;

  switch (tmp->type)
    {
#if 0
        case BOOTS:
        case GLOVES:
        case RING:
        case AMULET:
        case BRACERS:
        case GIRDLE:
          sprintf (buf, "%s %s", query_base_name (tmp, 0), describe_item (tmp, NULL));
          items[*numitems].item_sort = strdup (buf);
          sprintf (buf, "%s %s", query_name (tmp), describe_item (tmp, NULL));
          items[*numitems].item_real = strdup (buf);
          (*numitems)++;
          break;
#endif

        default:
          items[*numitems].item_sort = strdup (query_base_name (tmp, 0));
          items[*numitems].item_real = strdup (query_base_name (tmp, 1));
          (*numitems)++;
          break;
    }
  SET_FLAG (tmp, FLAG_UNPAID);
}

void
shop_listing (object *sign, object *op)
{
  int i, j, numitems = 0, numallocated = 0, x1, x2, y1, y2;
  const char *shop_coords = get_ob_key_value (sign, "shop_coords");
  object *stack;
  shopinv *items;

  /* Should never happen, but just in case a monster does apply a sign */
  if (op->type != PLAYER)
    return;

  if (!(shop_coords && sscanf (shop_coords, "%d,%d,%d,%d", &x1, &y1, &x2, &y2)))
    {
      x1 = 0;
      y1 = 0;
      x2 = op->map->width  - 1;
      y2 = op->map->height - 1;
    }

  items = (shopinv *) malloc (40 * sizeof (shopinv));
  numallocated = 40;

  /* Find all the appropriate items */
  for (i = x1; i <= x2; i++)
    {
      for (j = y1; j < y2; j++)
        {
          if (is_in_shop (op->map, i, j))
            {
              stack = GET_MAP_OB (op->map, i, j);

              while (stack)
                {
                  if (QUERY_FLAG (stack, FLAG_UNPAID))
                    {
                      if (numitems == numallocated)
                        {
                          items = (shopinv *) realloc (items, sizeof (shopinv) * (numallocated + 10));
                          numallocated += 10;
                        }

                      add_shop_item (stack, items, &numitems, &numallocated);
                    }

                  stack = stack->above;
                }
            }
        }
    }

  if (numitems == 0)
    {
      new_draw_info (NDI_UNIQUE, 0, op, "The shop is currently empty.\n");
      free (items);
      return;
    }

  qsort (items, numitems, sizeof (shopinv), (int (*)(const void *, const void *)) shop_sort);

  new_draw_info (NDI_UNIQUE, 0, op, "\nThe shop contains:");

  for (i = 0; i < numitems; i++)
    {
      /* Collapse items of the same name together */
      if ((i + 1) < numitems && !strcmp (items[i].item_real, items[i + 1].item_real))
        {
          items[i + 1].nrof += items[i].nrof;
          free (items[i].item_sort);
          free (items[i].item_real);
        }
      else
        {
          new_draw_info_format (NDI_UNIQUE, 0, op, "%d %s",
                                items[i].nrof ? items[i].nrof : 1, items[i].nrof == 1 ? items[i].item_sort : items[i].item_real);
          free (items[i].item_sort);
          free (items[i].item_real);
        }
    }

  free (items);
}

/* elmex: this function checks whether the object is in a shop */
bool
is_in_shop (object *o)
{
  if (!o->map)
    return false;

  return is_in_shop (o->map, o->x, o->y);
}

/* elmex: this function checks whether we are in a shop or not */
bool
is_in_shop (maptile *map, int x, int y)
{
  for (object *floor = GET_MAP_OB (map, x, y); floor; floor = floor->above)
    if (floor->type == SHOP_FLOOR)
      return true;

  return false;
}
Revision:	1.40
Committed:	Sun Jul 1 05:00:20 2007 UTC (16 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.39:	+10 -11 lines
Log Message:	- upgrade crossfire trt to the GPL version 3 (hopefully correctly). - add a single file covered by the GNU Affero General Public License (which is not yet released, so I used the current draft, which is legally a bit wavy, but its likely better than nothing as it expresses direct intent by the authors, and we can upgrade as soon as it has been released). * this should ensure availability of source code for the server at least and hopefully also archetypes and maps even when modified versions are not being distributed, in accordance of section 13 of the agplv3.