package internal

type Kind uint

const (
	KindUnknown Kind = iota
	KindBuy
	KindSell
	KindSplit
	sentinelKind
)

// String returns a unique string value for Kind k
func (k Kind) String() string {
	switch k {
	case KindBuy:
		return "buy"
	case KindSell:
		return "sell"
	case KindSplit:
		return "split"
	default:
		return "unknown"
	}
}

// Valid returns true if k is an accepted value for the Kind type
func (k Kind) Valid() bool {
	return k > 0 && k < sentinelKind
}

// Is returns true when k and o are valid and equal.
func (k Kind) Is(o any) bool {
	other, ok := o.(Kind)
	return ok && k.Valid() && k == other
}