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package activitypub

// Item struct
type Item = ObjectOrLink

const (
	EmptyIRI IRI = ""
	NilIRI   IRI = "-"

	EmptyID = EmptyIRI
	NilID   = NilIRI
)

// Flatten checks if Item can be flatten to an IRI or array of IRIs and returns it if so
func Flatten(it Item) Item {
	if it.IsCollection() {
		if c, ok := it.(CollectionInterface); ok {
			it = FlattenItemCollection(c.Collection())
		}
	}
	if it != nil && len(it.GetLink()) > 0 {
		return it.GetLink()
	}
	return it
}