types

var (
	// MimeTypesRSS contains canonical/standard mimetypes for RSS feeds.
	MimeTypesRSS = []string{"application/rss+xml", "application/rdf+xml"}
	// MimeTypesAtom contains canonical/standard mimetypes for Atom feeds.
	MimeTypesAtom = []string{"application/atom+xml"}
	// MimeTypesIndeterminate contains mimetypes that can be used for either RSS/Atom feeds and don't give any clues to
	// the actual type.
	MimeTypesIndeterminate = []string{"application/xml", "text/xml"}
	// MimeTypesJSONFeed contains canonical/standard mimetypes for JSONFeed feeds.
	MimeTypesJSONFeed = []string{"application/feed+json", "application/json"}
	// MimeTypesFeed is the concatenation of all feed mime types.
	MimeTypesFeed = slices.Concat(MimeTypesAtom, MimeTypesRSS, MimeTypesIndeterminate)
	// MimeTypesHTML contains canonical/standard mimetypes for HTML.
	MimeTypesHTML = []string{"text/html", "application/xhtml+xml"}
	// MimeTypesImage contains canonical/standard/common mimetypes for images.
	MimeTypesImage = []string{"image/avif", "image/gif", "image/jpeg", "image/png", "image/svg+xml", "image/webp"}
	// MediaImageExt contains canonical/standard/common file extensions for images.
	MediaImageExt = []string{"jpg", "jpeg", "png", "webp", "gif"}
)

var DateTimeFormats = []string{
	time.RFC1123Z,
	time.RFC1123,
	"Mon, 2 Jan 2006 15:04:05 -0700",
	"Mon, 2 Jan 2006 15:04:05 MST",
	"Mon, 02 Jan 2006 15:04 -0700",
	"Mon, 02 Jan 2006 15:04 MST",
	"Mon, 2 Jan 2006 15:04 -0700",
	"Mon, 2 Jan 2006 15:04 MST",
	time.RFC3339,
	"2006-01-02T15:04:05.00Z07:00",
	time.DateTime,
	time.DateOnly,
	time.DateOnly + "T" + "15:04-07:00",
	"2006-01",
	"2006",
	"Jan 2, 2006",
	"2006 Jan 2 15:04:05 MST",
	"Mon, 2 Jan 2006",
}

var (
	// DefaultFeedUpdateInterval defines the update interval for feeds that do not define an update interval or where
	// one cannot be calculated based off item frequency.
	DefaultFeedUpdateInterval = time.Hour
)

var ErrInvalidDateTimeFormat = errors.New("invalid datetime format")

var UnixEpoch = time.Unix(0, 0)