using PrivaPub.Models.Post;

namespace PrivaPub.Federation.Objects
{
	public static class Addressing
	{
		public const string Public = "https://www.w3.org/ns/activitystreams#Public";

		public static bool IsPublic(string address) => address is Public or "as:Public" or "Public";

		public static PostVisibility Classify(IReadOnlyCollection<string> to, IReadOnlyCollection<string> cc, string authorFollowers)
		{
			if (to.Any(IsPublic))
				return PostVisibility.Public;
			if (cc.Any(IsPublic))
				return PostVisibility.Unlisted;
			if (!string.IsNullOrEmpty(authorFollowers) && (to.Contains(authorFollowers) || cc.Contains(authorFollowers)))
				return PostVisibility.FollowersOnly;
			return PostVisibility.Direct;
		}
	}
}