server/src/kernel/pool.c

/*
Copyright (c) 1998-2010, Enno Rehling <enno@eressea.de>
                         Katja Zedel <katze@felidae.kn-bremen.de
                         Christian Schlittchen <corwin@amber.kn-bremen.de>

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
**/

#include <platform.h>
#include <kernel/config.h>
#include "pool.h"

#include "faction.h"
#include "item.h"
#include "magic.h"
#include "order.h"
#include "region.h"
#include "race.h"
#include "unit.h"

#include <util/parser.h>
#include <util/log.h>

#include <assert.h>
#include <stdlib.h>

#define TODO_POOL
#undef TODO_RESOURCES

int
get_resource(const unit * u, const resource_type * rtype)
{
  const item_type * itype = resource2item(rtype);

  if (rtype->uget) {
    /* this resource is probably special */
    int i = rtype->uget(u, rtype);
    if (i>=0) return i;
  }
  if (itype!=NULL) {
    if (itype == olditemtype[R_STONE] && (u->race->flags&RCF_STONEGOLEM)) {
      return u->number*GOLEM_STONE;
    } else if (itype==olditemtype[R_IRON] && (u->race->flags&RCF_IRONGOLEM)) {
      return u->number*GOLEM_IRON;
    } else {
      const item * i = *i_findc(&u->items, itype);
      if (i) return i->number;
      return 0;
    }
  }
  if (rtype == oldresourcetype[R_AURA])
    return get_spellpoints(u);
  if (rtype == oldresourcetype[R_PERMAURA])
    return max_spellpoints(u->region, u);
  log_error(("trying to get unknown resource '%s'.\n", rtype->_name[0]));
  return 0;
}

int
change_resource(unit * u, const resource_type * rtype, int change)
{
  int i = 0;

  if (rtype->uchange)
    i = rtype->uchange(u, rtype, change);
  else if (rtype == oldresourcetype[R_AURA])
    i = change_spellpoints(u, change);
  else if (rtype == oldresourcetype[R_PERMAURA])
    i = change_maxspellpoints(u, change);
  else
    assert(!"undefined resource detected. rtype->uchange not initialized.");
  assert(i >= 0 && (i < 100000000));  /* soft test to catch mischief */
  return i;
}

int
get_reservation(const unit * u, const resource_type * rtype)
{
  struct reservation * res = u->reservations;

  if (rtype==oldresourcetype[R_STONE] && (u->race->flags&RCF_STONEGOLEM))
    return (u->number * GOLEM_STONE);
  if (rtype==oldresourcetype[R_IRON] && (u->race->flags&RCF_IRONGOLEM))
    return (u->number * GOLEM_IRON);
  while (res && res->type!=rtype) res=res->next;
  if (res) return res->value;
  return 0;
}

int
change_reservation(unit * u, const resource_type * rtype, int value)
{
  struct reservation *res, ** rp = &u->reservations;

  if (!value) return 0;

  while (*rp && (*rp)->type!=rtype) rp=&(*rp)->next;
  res = *rp;
  if (!res) {
    *rp = res = calloc(sizeof(struct reservation), 1);
    res->type = rtype;
    res->value = value;
  } else if (res && res->value+value<=0) {
    *rp = res->next;
    free(res);
    return 0;
  } else {
    res->value += value;
  }
  return res->value;
}

static int
new_set_resvalue(unit * u, const resource_type * rtype, int value)
{
  struct reservation *res, ** rp = &u->reservations;

  while (*rp && (*rp)->type!=rtype) rp=&(*rp)->next;
  res = *rp;
  if (!res) {
    if (!value) return 0;
    *rp = res = calloc(sizeof(struct reservation), 1);
    res->type = rtype;
    res->value = value;
  } else if (res && value<=0) {
    *rp = res->next;
    free(res);
    return 0;
  } else {
    res->value = value;
  }
  return res->value;
}

int
get_pooled(const unit * u, const resource_type * rtype, unsigned int mode, int count)
{
  const faction * f = u->faction;
  unit *v;
  int use = 0;
  region * r = u->region;
  int have = get_resource(u, rtype);

  if ((u->race->ec_flags & GETITEM) == 0) {
    mode &= (GET_SLACK|GET_RESERVE);
  }

  if ((mode & GET_SLACK) && (mode & GET_RESERVE)) use = have;
  else {
    int reserve = get_reservation(u, rtype);
    int slack = MAX(0, have-reserve);
    if (mode & GET_RESERVE) use = have-slack;
    else if (mode & GET_SLACK) use = slack;
  }
  if (rtype->flags & RTF_POOLED && mode & ~(GET_SLACK|GET_RESERVE)) {
    for (v = r->units; v && use<count; v = v->next) if (u!=v) {
      int mask;

      if (v->items==NULL && rtype->uget==NULL) continue;
      if ((urace(v)->ec_flags & GIVEITEM) == 0) continue;

      if (v->faction == f) {
        mask = (mode >> 3) & (GET_SLACK|GET_RESERVE);
      }
      else if (alliedunit(v, f, HELP_MONEY)) mask = (mode >> 6) & (GET_SLACK|GET_RESERVE);
      else continue;
      use += get_pooled(v, rtype, mask, count-use);
    }
  }
  return use;
}

int
use_pooled(unit * u, const resource_type * rtype, unsigned int mode, int count)
{
  const faction *f = u->faction;
  unit *v;
  int use = count;
  region * r = u->region;
  int n = 0, have = get_resource(u, rtype);

  if ((u->race->ec_flags & GETITEM) == 0) {
    mode &= (GET_SLACK|GET_RESERVE);
  }

  if ((mode & GET_SLACK) && (mode & GET_RESERVE)) {
    n = MIN(use, have);
  } else {
    int reserve = get_reservation(u, rtype);
    int slack = MAX(0, have-reserve);
    if (mode & GET_RESERVE) {
      n = have-slack;
      n = MIN(use, n);
      change_reservation(u, rtype, -n);
    }
    else if (mode & GET_SLACK) {
      n = MIN(use, slack);
    }
  }
  if (n>0) {
    change_resource(u, rtype, -n);
    use -= n;
  }

  if (rtype->flags & RTF_POOLED && mode & ~(GET_SLACK|GET_RESERVE)) {
    for (v = r->units; use>0 && v!=NULL; v = v->next) if (u!=v) {
      int mask;
      if ((urace(v)->ec_flags & GIVEITEM) == 0) continue;
      if (v->items==NULL && rtype->uget==NULL) continue;

      if (v->faction == f) {
        mask = (mode >> 3) & (GET_SLACK|GET_RESERVE);
      }
      else if (alliedunit(v, f, HELP_MONEY)) mask = (mode >> 6) & (GET_SLACK|GET_RESERVE);
      else continue;
      use -= use_pooled(v, rtype, mask, use);
    }
  }
  return count-use;
}


int
reserve_cmd(unit * u, struct order *ord)
{
  if (u->number > 0 && (urace(u)->ec_flags & GETITEM)) {
    int use, count;
    const resource_type * rtype;
    const char * s;

    init_tokens(ord);
    skip_token();
    s = getstrtoken();
    count = atoip((const char *)s);

    if (count == 0 && findparam(s, u->faction->locale)==P_EACH) {
      count = getint() * u->number;
    }

    rtype = findresourcetype(getstrtoken(), u->faction->locale);
    if (rtype == NULL) return 0;

    new_set_resvalue(u, rtype, 0);  /* make sure the pool is empty */
    use = use_pooled(u, rtype, GET_DEFAULT, count);
    if (use) {
      new_set_resvalue(u, rtype, use);
      change_resource(u, rtype, use);
    }
  }
  return 0;
}