//namespace ActivityPub;


///// <summary>
///// A class to create ActivityPub Objects/Activities/etc from an incoming dynamic object
///// </summary>
//public static class DynamicObjectFactory {
//  public static ObjectOrLink? NewObjectOrLink(dynamic that) {
//    if (that is string) return (ObjectOrLink) new Uri((string)that);
//    if (that is Uri) return (ObjectOrLink)that;

//    string type = that.Type;
//    if (type == null) return null; // TODO: throw exception?
//    type = Types.Normalize(type);

//    ObjectOrLink newObject;
//    switch (type) {
//      // https://www.w3.org/TR/activitystreams-vocabulary/#types
//      case "Object":                return (ObjectOrLink)NewObject(that);
//      case "Link":                  return (ObjectOrLink)NewLink(that);
//      case "Activity":              return (ObjectOrLink)NewActivity(that);
//      case "IntransitiveActivity":  return (ObjectOrLink)NewIntransitiveActivity(that);
//      case "Collection":            return (ObjectOrLink)NewCollection(that);
//      case "OrderedCollection":     return (ObjectOrLink)NewOrderedCollection(that);
//      case "CollectionPage":        return (ObjectOrLink)NewCollectionPage(that);
//      case "OrderedCollectionPage": return (ObjectOrLink)NewOrderedCollectionPage(that);
      
//      // this is technically not an ActivityStreams type, but it's useful to exist
//      case "Actor":                 return (ObjectOrLink)NewActor(that);

//      // https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
//      case "Accept":          return (ObjectOrLink)NewAccept(that);
//      case "Add":             return (ObjectOrLink)NewAdd(that);
//      case "Announce":        return (ObjectOrLink)NewAnnounce(that);
//      case "Arrive":          return (ObjectOrLink)NewArrive(that);
//      case "Block":           return (ObjectOrLink)NewBlock(that);
//      case "Create":          return (ObjectOrLink)NewCreate(that);
//      case "Delete":          return (ObjectOrLink)NewDelete(that);
//      case "Dislike":         return (ObjectOrLink)NewDislike(that);
//      case "Flag":            return (ObjectOrLink)NewFlag(that);
//      case "Follow":          return (ObjectOrLink)NewFollow(that);
//      case "Ignore":          return (ObjectOrLink)NewIgnore(that);
//      case "Invite":          return (ObjectOrLink)NewInvite(that);
//      case "Join":            return (ObjectOrLink)NewJoin(that);
//      case "Leave":           return (ObjectOrLink)NewLeave(that);
//      case "Like":            return (ObjectOrLink)NewLike(that);
//      case "Listen":          return (ObjectOrLink)NewListen(that);
//      case "Move":            return (ObjectOrLink)NewMove(that);
//      case "Offer":           return (ObjectOrLink)NewOffer(that);
//      case "Question":        return (ObjectOrLink)NewQuestion(that);
//      case "Reject":          return (ObjectOrLink)NewReject(that);
//      case "Read":            return (ObjectOrLink)NewRead(that);
//      case "Remove":          return (ObjectOrLink)NewRemove(that);
//      case "TentativeReject": return (ObjectOrLink)NewTentativeReject(that);
//      case "TentativeAccept": return (ObjectOrLink)NewTentativeAccept(that); 
//      case "Travel":          return (ObjectOrLink)NewTravel(that);
//      case "Undo":            return (ObjectOrLink)NewUndo(that);
//      case "Update":          return (ObjectOrLink)NewUpdate(that);
//      case "View":            return (ObjectOrLink)NewView(that);

//      // https://www.w3.org/TR/activitystreams-vocabulary/#actor-types
//      case "Application":     return (ObjectOrLink)NewApplication(that);
//      case "Group":           return (ObjectOrLink)NewGroup(that);
//      case "Organization":    return (ObjectOrLink)NewOrganization(that);
//      case "Person":          return (ObjectOrLink)NewPerson(that);
//      case "Service":         return (ObjectOrLink)NewService(that);

//      // https://www.w3.org/TR/activitystreams-vocabulary/#object-types
//      case "Article":         return (ObjectOrLink)NewArticle(that);
//      case "Audio":           return (ObjectOrLink)NewAudio(that);
//      case "Document":        return (ObjectOrLink)NewDocument(that);
//      case "Event":           return (ObjectOrLink)NewEvent(that);
//      case "Image":           return (ObjectOrLink)NewImage(that);
//      case "Note":            return (ObjectOrLink)NewNote(that);
//      case "Page":            return (ObjectOrLink)NewPage(that);
//      case "Place":           return (ObjectOrLink)NewPlace(that);
//      case "Profile":         return (ObjectOrLink)NewProfile(that);
//      case "Relationship":    return (ObjectOrLink)NewRelationship(that);
//      case "Tombstone":       return (ObjectOrLink)NewTombstone(that);
//      case "Video":           return (ObjectOrLink)NewVideo(that);
//      case "Mention":         return (ObjectOrLink)NewMention(that);

//      default: return null;
//    }
//  }

//  public static ListOrLink<T>? NewListOrLink<T>(dynamic that) where T : KristofferStrube.ActivityStreams.Object, new() {
//    if (that == null) return null;

//    if (that is string) return (ListOrLink<T>)new Uri((string)that);
//    if (that is Uri) return (ListOrLink<T>)that;

//    if (that is IEnumerable<dynamic>)
//      return (ListOrLink<T>)(that as IEnumerable<dynamic>).Select(x => NewObjectOrLink(x)).Cast<GenericObjectOrLink<T>>().ToList();

//    return null;
//  }

//  public static DateTimeOffset? NewDate(dynamic that) {
//    DateTimeOffset result;
//    if(DateTimeOffset.TryParse(that, out result)) { return result; }
//    return null;
//  }

//  public static Object NewObject(dynamic that, Object? self = null) {
//    if(self == null) self = new Object();

//    self.Id = new Uri(that.Id);
//    // self.Type = that.Type; // not necessary
//    self.Attachment = NewObjectOrLink(that.Attachment);
//    self.AttributedTo = NewObjectOrLink(that.AttributedTo);
//    self.Audience = NewObjectOrLink(that.Audience);
//    self.Content = that.Content;
//    self.Source = NewObjectOrLink(that.Source);
//    self.Context = NewObjectOrLink(that.Id);
//    self.Name = that.Name;
//    self.EndTime = NewDate(that.EndTime);
//    self.Generator = NewObjectOrLink(that.Generator);
//    self.Icon = NewObjectOrLink(that.Icon);
//    self.Image = NewObjectOrLink(that.Image);
//    self.InReplyTo = NewObjectOrLink(that.InReplyTo);
//    self.Location = NewObjectOrLink(that.Location);
//    self.Preview = NewObjectOrLink(that.Preview);
//    self.Published = NewDate(that.Published);
//    self.Replies = NewObjectOrLink(that.Replies);
//    self.StartTime = NewDate(that.StartTime);
//    self.Summary = that.Summary;
//    self.Tag = NewObjectOrLink(that.Tag);
//    self.Updated = NewDate(that.Id);
//    self.Url = (that.Url == null || that.Url is Uri) ? that.Url : new Uri(that.Url);
//    self.To = NewListOrLink<Object>(that.To);
//    self.Bto = NewListOrLink<Object>(that.Bto);
//    self.Cc = NewListOrLink<Object>(that.Cc);
//    self.Bcc = NewListOrLink<Object>(that.Bcc);
//    self.MediaType = that.MediaType;
//    self.Duration = that.Duration;
//    self.Likes = NewListOrLink<Object>(that.Likes);
//    self.Shares = NewListOrLink<Object>(that.Shares);

//    return self;
//  }

//  public static Link NewLink(dynamic that, Link? self = null) {
//    if (self == null) self = new Link();

//    self.Id = new Uri(that.Id);
//    // self.Type = that.Type; // not necessary

//    self.Rel = that.Rel;
//    self.MediaType = that.MediaType;
//    self.Name = that.Name;
//    self.Hreflang = that.Hreflang;
//    self.Height = that.Height;
//    self.Width = that.Width;
//    self.Preview = NewObjectOrLink(that.Preview);

//    return self;
//  }

//  public static Mention NewMention(dynamic that, Mention? self = null) {
//    if(self == null) self = new Mention();

//    self = NewLink(that, self);

//    return self;
//  }

//  public static IntransitiveActivity NewIntransitiveActivity(dynamic that, IntransitiveActivity? self = null) {
//    if (self == null) self = new IntransitiveActivity();

//    self = NewObject(that, self);

//    self.Actor = NewObjectOrLink(that.Actor);
//    self.Target = NewObjectOrLink(that.Target);
//    self.Result = NewObjectOrLink(that.Result);
//    self.Origin = NewObjectOrLink(that.Origin);
//    self.Instrument = NewObjectOrLink(that.Instrument);

//    return self;
//  }

//  public static Activity NewActivity(dynamic that, Activity? self = null) {
//    if (self == null) self = new Activity();

//    self = NewIntransitiveActivity(that, self);

//    self.Object = NewObjectOrLink(that.Object);

//    return self;
//  }

//  public static Collection NewCollection(dynamic that, Collection? self = null) {
//    if (self == null) self = new Collection();

//    self = NewObject(that, self);

//    self.TotalItems = that.TotalItems;
//    self.Current = NewObjectOrLink(that.Current);
//    self.First = NewObjectOrLink(that.First);
//    self.Last = NewObjectOrLink(that.Last);
//    self.Items = NewObjectOrLink(that.Items);

//    return self;
//  }

//  public static Collection NewOrderedCollection(dynamic that, OrderedCollection? self = null) {
//    if (self == null) self = new OrderedCollection();

//    self = NewCollection(that, self);

//    return self;
//  }

//  public static Collection NewCollectionPage(dynamic that, CollectionPage? self = null) {
//    if (self == null) self = new CollectionPage();

//    self = NewCollection(that, self);

//    self.PartOf = NewObjectOrLink(that.PartOf);
//    self.Next = NewObjectOrLink(that.Next);
//    self.Prev = NewObjectOrLink(that.Prev);

//    return self;
//  }

//  public static Collection NewOrderedCollectionPage(dynamic that, OrderedCollectionPage? self = null) {
//    if (self == null) self = new OrderedCollectionPage();

//    self = NewCollectionPage(that, self);

//    return self;
//  }

//  public static OneOf<Uri, Endpoints>? NewEndpointsOrUri(dynamic that) {
//    if (that == null) return null;

//    if (that is string) return (OneOf<Uri, Endpoints>)new Uri((string)that);
//    if (that is Uri) return (OneOf<Uri, Endpoints>)that;

//    return NewEndpoints(that);
//  }

//  public static Endpoints NewEndpoints(dynamic that, Endpoints? self = null) {
//    if (self == null) self = new Endpoints();

//    self.ProxyUrl = new Uri(that.ProxyUrl);
//    self.OauthAuthorizationEndpoint = new Uri(that.OauthAuthorizationEndpoint);
//    self.OauthTokenEndpoint = new Uri(that.OauthTokenEndpoint);
//    self.ProvideClientKey = new Uri(that.ProvideClientKey);
//    self.SignClientKey = new Uri(that.SignClientKey);
//    self.SharedInbox = new Uri(that.SharedInbox);

//    return self;
//  }

//  public static Actor NewActor(dynamic that, Actor? self = null) {
//    if (self == null) self = new Actor();

//    self = NewObject(that, self);

//    self.Inbox = NewObjectOrLink(that.Inbox);
//    self.Outbox = NewObjectOrLink(that.Outbox);
//    self.Following = NewObjectOrLink(that.Following);
//    self.Followers = NewObjectOrLink(that.Followers);
//    self.Liked = NewObjectOrLink(that.Liked);
//    self.Streams = NewListOrLink<Collection>(that.Streams);
//    self.PreferredUsername = that.PreferredUsername;
//    self.Endpoints = NewEndpointsOrUri(that.Endpoints);

//    return self;
//  }

//  public static Article NewArticle(dynamic that, Article? self = null) {
//    if (self == null) self = new Article();

//    self = NewObject(that, self);

//    return self;
//  }

//  public static Document NewDocument(dynamic that, Document? self = null) {
//    if (self == null) self = new Document();

//    self = NewObject(that, self);

//    return self;
//  }

//  public static Audio NewAudio(dynamic that, Audio? self = null) {
//    if (self == null) self = new Audio();

//    self = NewDocument(that, self);

//    return self;
//  }

//  public static Event NewEvent(dynamic that, Event? self = null) {
//    if (self == null) self = new Event();

//    self = NewObject(that, self);

//    return self;
//  }

//  public static Image NewImage(dynamic that, Image? self = null) {
//    if (self == null) self = new Image();

//    self = NewDocument(that, self);

//    return self;
//  }

//  public static Note NewNote(dynamic that, Note? self = null) {
//    if (self == null) self = new Note();

//    self = NewObject(that, self);

//    return self;
//  }

//  public static Page NewPage(dynamic that, Page? self = null) {
//    if (self == null) self = new Page();

//    self = NewDocument(that, self);

//    return self;
//  }

//  public static Place NewPlace(dynamic that, Place? self = null) {
//    if (self == null) self = new Place();

//    self = NewObject(that, self);
//    self.Accuracy = that.Accuracy;
//    self.Altitude = that.Altitude;
//    self.Latitude = that.Latitude;
//    self.Longitude = that.Longitude;
//    self.Radius = that.Radius;
//    self.Units = that.Units;

//    return self;
//  }

//  public static Profile NewProfile(dynamic that, Profile? self = null) {
//    if (self == null) self = new Profile();

//    self = NewObject(that, self);
//    self.Describes = NewObjectOrLink(that.Describes);

//    return self;
//  }

//  public static Relationship NewRelationship(dynamic that, Relationship? self = null) {
//    if (self == null) self = new Relationship();

//    self = NewObject(that, self);
//    self.Subject = NewObjectOrLink(that.Subject);
//    self.Object = NewObjectOrLink(that.Object);
//    self.relationship = that.relationship;

//    return self;
//  }

//  public static Tombstone NewTombstone(dynamic that, Tombstone? self = null) {
//    if (self == null) self = new Tombstone();

//    self = NewObject(that, self);
//    self.FormerType = that.FormerType;
//    self.Deleted = NewDate(that.Deleted);

//    return self;
//  }

//  public static Video NewVideo(dynamic that, Video? self = null) {
//    if (self == null) self = new Video();

//    self = NewDocument(that, self);

//    return self;
//  }

//  public static Application NewApplication(dynamic that, Application? self = null) {
//    if (self == null) self = new Application();

//    self = NewActor(that, self);

//    return self;
//  }

//  public static Group NewGroup(dynamic that, Group? self = null) {
//    if (self == null) self = new Group();

//    self = NewActor(that, self);

//    return self;
//  }

//  public static Organization NewOrganization(dynamic that, Organization? self = null) {
//    if (self == null) self = new Organization();

//    self = NewActor(that, self);

//    return self;
//  }

//  public static Person NewPerson(dynamic that, Person? self = null) {
//    if (self == null) self = new Person();

//    self = NewActor(that, self);

//    return self;
//  }

//  public static Service NewService(dynamic that, Service? self = null) {
//    if (self == null) self = new Service();

//    self = NewActor(that, self);

//    return self;
//  }

//  public static Block NewBlock(dynamic that, Block? self = null) {
//    if (self == null) self = new Block();

//    self = NewIgnore(that, self);

//    return self;
//  }

//  public static Invite NewInvite(dynamic that, Invite? self = null) {
//    if (self == null) self = new Invite();

//    self = NewOffer(that, self);

//    return self;
//  }

//  public static Accept NewAccept(dynamic that, Accept? self = null) {
//    if (self == null) self = new Accept();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Add NewAdd(dynamic that, Add? self = null) {
//    if (self == null) self = new Add();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Announce NewAnnounce(dynamic that, Announce? self = null) {
//    if (self == null) self = new Announce();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Create NewCreate(dynamic that, Create? self = null) {
//    if (self == null) self = new Create();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Delete NewDelete(dynamic that, Delete? self = null) {
//    if (self == null) self = new Delete();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Dislike NewDislike(dynamic that, Dislike? self = null) {
//    if (self == null) self = new Dislike();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Flag NewFlag(dynamic that, Flag? self = null) {
//    if (self == null) self = new Flag();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Follow NewFollow(dynamic that, Follow? self = null) {
//    if (self == null) self = new Follow();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Ignore NewIgnore(dynamic that, Ignore? self = null) {
//    if (self == null) self = new Ignore();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Join NewJoin(dynamic that, Join? self = null) {
//    if (self == null) self = new Join();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Leave NewLeave(dynamic that, Leave? self = null) {
//    if (self == null) self = new Leave();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Like NewLike(dynamic that, Like? self = null) {
//    if (self == null) self = new Like();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Listen NewListen(dynamic that, Listen? self = null) {
//    if (self == null) self = new Listen();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Move NewMove(dynamic that, Move? self = null) {
//    if (self == null) self = new Move();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Offer NewOffer(dynamic that, Offer? self = null) {
//    if (self == null) self = new Offer();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Read NewRead(dynamic that, Read? self = null) {
//    if (self == null) self = new Read();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Reject NewReject(dynamic that, Reject? self = null) {
//    if (self == null) self = new Reject();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Remove NewRemove(dynamic that, Remove? self = null) {
//    if (self == null) self = new Remove();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Undo NewUndo(dynamic that, Undo? self = null) {
//    if (self == null) self = new Undo();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static Update NewUpdate(dynamic that, Update? self = null) {
//    if (self == null) self = new Update();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static View NewView(dynamic that, View? self = null) {
//    if (self == null) self = new View();

//    self = NewActivity(that, self);

//    return self;
//  }

//  public static TentativeAccept NewTentativeAccept(dynamic that, TentativeAccept? self = null) {
//    if (self == null) self = new TentativeAccept();

//    self = NewAccept(that, self);

//    return self;
//  }

//  public static TentativeReject NewTentativeReject(dynamic that, TentativeReject? self = null) {
//    if (self == null) self = new TentativeReject();

//    self = NewReject(that, self);

//    return self;
//  }

//  public static Arrive NewArrive(dynamic that, Arrive? self = null) {
//    if (self == null) self = new Arrive();

//    self = NewIntransitiveActivity(that, self);

//    return self;
//  }

//  public static Travel NewTravel(dynamic that, Travel? self = null) {
//    if (self == null) self = new Travel();

//    self = NewIntransitiveActivity(that, self);

//    return self;
//  }

//  public static Question NewQuestion(dynamic that, Question? self = null) {
//    if (self == null) self = new Question();

//    self = NewIntransitiveActivity(that, self);
//    self.OneOf = NewListOrLink<Object>(that.OneOf);
//    self.AnyOf = NewListOrLink<Object>(that.AnyOf);
//    ObjectOrLink? closed = NewObjectOrLink(that.Closed);
//    if(closed != null) self.Closed = (Uri)closed;
//    else {
//      DateTimeOffset? dateClosed = NewDate(that.Closed);
//      if (dateClosed.HasValue) self.Closed = dateClosed.Value;
//      else self.Closed = !!that.closed;
//    }

//    return self;
//  }

//}