Разделение сообщения

backend/src/Contracts/Messaging/Domain/MediaMessage.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+
+namespace Knot.Contracts.Messaging.Domain;
+
+public class MediaMessage : Message
+{
+    public override string Type => MediaType.ToString().ToLower();
+    public override string? Content { get; protected set; }
+    public string? Caption { get => Content; private set => Content = value; }
+    public MediaType MediaType { get; private set; }
+    
+    private List<Media> _media = new();
+    public IReadOnlyCollection<Media> Media => _media.AsReadOnly();
+
+    private MediaMessage() : base() { MediaType = MediaType.File; }
+
+    public MediaMessage(Guid id, Guid chatId, Guid senderId, MediaType mediaType, string? caption, Guid? replyToId, Guid? forwardedFromId, DateTime createdAt, bool isImported)
+        : base(id, chatId, senderId, replyToId, forwardedFromId, createdAt, isImported) { MediaType = mediaType; Caption = caption; }
+
+    public MediaMessage(Guid id, Guid chatId, Guid senderId, string mediaType, string? caption, Guid? replyToId, Guid? forwardedFromId, DateTime createdAt, bool isImported)
+        : this(id, chatId, senderId, Enum.TryParse<MediaType>(mediaType, true, out var mt) ? mt : MediaType.File, caption, replyToId, forwardedFromId, createdAt, isImported) { }
+
+    public void AddMedia(string type, string url, string? filename, long? size) => _media.Add(new Media { Type = type, Url = url, FileId = filename, Size = size });
+
+    public override void Edit(string newCaption) => base.Edit(newCaption);
+
+    public override void Delete() { Caption = null; base.Delete(); }
+}