#include <assert.h>

#include "adventure.h"

static void
swap_locations(struct object *a, struct object *b)
{
	struct object *t;

	assert(a != NULL);
	assert(b != NULL);

	t = a->location;
	a->location = b->location;
	b->location = t;
}

const char *
cannot_be_opened(struct object *o)
{
	return "That cannot be opened.";
}

const char *
cannot_be_closed(struct object *o)
{
	return "That cannot be closed.";
}

const char *
cannot_be_locked(struct object *o)
{
	return "That cannot be locked.";
}

const char *
cannot_be_unlocked(struct object *o)
{
	return "That cannot be unlocked.";
}

const char *
is_already_open(struct object *o)
{
	return "That is already open.";
}

const char *
is_already_closed(struct object *o)
{
	return "That is already closed.";
}

const char *
is_already_locked(struct object *o)
{
	return "That is already locked.";
}

const char *
is_already_unlocked(struct object *o)
{
	return "That is already unlocked.";
}

const char *
is_still_open(struct object *o)
{
	return "That is still open.";
}

const char *
is_still_locked(struct object *o)
{
	return "That is still locked.";
}

const char *
toggle_backdoor(struct object *o)
{
	swap_locations(open_door_to_backroom, closed_door_to_backroom);
	swap_locations(open_door_to_cave, closed_door_to_cave);
	return "OK.";
}

const char *
toggle_box(struct object *o)
{
	swap_locations(open_box, closed_box);
	return "OK.";
}

const char *
toggle_box_lock(struct object *o)
{
	if (key_for_box->location == player) {
		swap_locations(closed_box, locked_box);
		return "OK.";
	} else {
		return "You try really hard, but the closed box won't open "
		       "without a key.";
	}
}