/*
 * Implementation of wands.
 */

#include <stdlib.h>

#include "obj.h"
#include "vars.h"
#include "util.h"
#include "pline.h"
#include "format.h"
#include "structs.h"
#include "objtypes.h"

#include "obj-wand.h"

typedef struct wand WAND;

/*
 * Private data for wands.  All we have here are the charge count and a
 *  flag describing whether the player knows the charge count.
 */
struct wand {
  unsigned int flags;
#define WF_KNOWN 0x00000001
  int charges;
  } ;

/*
 * Return the WAND * for an OBJ *.
 */
static WAND *wand_for_obj(OBJ *o)
{
 if (objtypes[o->type].class != OC_WAND) panic("non-wand where wand needed");
 return(o->private);
}

/*
 * Zap something.  It is the caller's responsibility to ensure the
 *  argument INVOBJ is exactly one wand.
 */
void zap_it(INVOBJ *io)
{
 OBJ *o;
 WAND *w;

 if (io->n > 1) abort();
 o = io->v[0];
 w = wand_for_obj(o);
 if (w->charges < 1)
  { pline("Nothing happens.");
    return;
  }
 w->charges --;
 switch (o->type)
  { case OBJ_WAND_OF_LIGHT:
       objtypes[o->type].flags |= OTF_KNOWN;
       break;
  }
}

/*
 * The new method for wands.  They are all born with zero charges; the
 *  charge count must be set elsewhere.
 */
static OBJ *new_wand(int type __attribute__((__unused__)), OBJ *o)
{
 WAND *w;

 w = malloc(sizeof(WAND));
 w->flags = 0;
 w->charges = 0;
 o->private = w;
 return(o);
}

/*
 * The old method for wands.
 */
static void old_wand(OBJ *o)
{
 free(o->private);
}

/*
 * The identified method for wands.
 */
static int identified_wand(INVOBJ *io)
{
 return( (objtypes[io->v[0]->type].flags & OTF_KNOWN) &&
	 (wand_for_obj(io->v[0])->flags & WF_KNOWN) );
}

/*
 * The identify method for wands.
 */
static INVOBJ *identify_wand(INVOBJ *io)
{
 objtypes[io->v[0]->type].flags |= OTF_KNOWN;
 wand_for_obj(io->v[0])->flags |= WF_KNOWN;
 return(io);
}

/*
 * The OBJOPS for wands.
 */
#define format_wand std_format
#define fmt_cond_wand panic_fmt_cond
#define fmt_spec_wand panic_fmt_spec
#define collapsible_wand never_collapsible
#define identical_wand never_identical
#define split_wand std_split
#define moved_wand noop_moved
OBJOPS objops_wand = OBJOPS_INIT(wand);