#include <stdlib.h>

#include "structs.h"

#include "effect.h"

/*
 * A status effect has been added, deleted, or changed; recompute
 *  effects on the monster.
 */
void effect_recompute(MONST *m)
{
 EFFECT *e;

 m->speed = m->type->info->basespeed;
 m->heal = m->type->info->baseheal;
 m->effflags = 0;
 for (e=m->effects;e;e=e->link) (*e->ops->apply)(m,e->private);
}

/*
 * For all the status effects on the monster, call the death method and
 *  destroy the effect.
 */
void effect_death(MONST *m)
{
 EFFECT *e;

 while ((e = m->effects))
  { m->effects = e->link;
    (*e->ops->death)(m,e->private);
    free(e);
  }
}

/*
 * Add a status effect on a monster, given the effect's private data
 *  and ops vector.
 */
EFFECT *effect_add(MONST *m, void *priv, EFFECTOPS *ops)
{
 EFFECT *e;

 e = malloc(sizeof(EFFECT));
 e->m = m;
 e->private = priv;
 e->ops = ops;
 e->link = m->effects;
 m->effects = e;
 effect_recompute(m);
 return(e);
}

/*
 * Remove a status effect from a monster.   Does not make any ops
 *  callbacks; the only side effects are to free the EFFECT itself and
 *  effect_recompute().
 */
void effect_remove(MONST *m, EFFECT *earg)
{
 EFFECT **ep;
 EFFECT *e;

 ep = &m->effects;
 while ((e = *ep))
  { if (e == earg)
     { *ep = e->link;
       free(e);
       break;
     }
    else
     { ep = &e->link;
     }
  }
 effect_recompute(m);
}