package game

// Object is the _o arm of the C THING union: anything that can lie on the
// floor or ride in a pack.
type Object struct {
	Type    byte   // what kind of object it is (Potion, Scroll, Weapon, ...)
	Pos     Coord  // where it lives on the screen
	Text    string // what it says if you read it
	Launch  int    // what you need to launch it (weapon index, -1 none)
	PackCh  byte   // what character it is in the pack
	Damage  string // damage if used like sword
	HurlDmg string // damage if thrown
	Count   int    // count for plural objects
	Which   int    // which object of a type it is
	HPlus   int    // plusses to hit
	DPlus   int    // plusses to damage
	Arm     int    // armor protection — overloaded as in C (see Charges/GoldVal)
	Flags   ObjFlags
	Group   int    // group number for this object
	Label   string // label for object
}

// newObject is list.c new_item() for objects: a zeroed Object with the
// same non-zero defaults the C code relies on.
func newObject() *Object {
	return &Object{Launch: -1}
}

// Charges is the o_charges alias for Arm on wands and staffs.
func (o *Object) Charges() int { return o.Arm }

// SetCharges stores a charge count in the overloaded Arm field.
func (o *Object) SetCharges(n int) { o.Arm = n }

// GoldVal is the o_goldval alias for Arm on gold piles.
func (o *Object) GoldVal() int { return o.Arm }

// SetGoldVal stores a gold value in the overloaded Arm field.
func (o *Object) SetGoldVal(n int) { o.Arm = n }

// attachObj is list.c attach(): push item onto the front of a list.
func attachObj(list *[]*Object, item *Object) {
	*list = append([]*Object{item}, *list...)
}

// detachObj is list.c detach(): remove item (by identity) from a list.
func detachObj(list *[]*Object, item *Object) {
	for i, o := range *list {
		if o == item {
			*list = append((*list)[:i], (*list)[i+1:]...)
			return
		}
	}
}