Implement Invite Types (#114)

src/Disqord.Core/Entities/Core/Invite/IInvite.cs

@@ -8,6 +8,11 @@ namespace Disqord;
 /// </summary>
 public interface IInvite : IPossiblyChannelEntity, IClientEntity, IJsonUpdatable<InviteJsonModel>
 {
+    /// <summary>
+    ///     Gets the type of this invite.
+    /// </summary>
+    InviteType Type { get; }
+
     /// <summary>
     ///     Gets the code of this invite.
     /// </summary>

src/Disqord.Core/Entities/Transient/Invite/TransientInvite.cs

@@ -9,6 +9,9 @@ public class TransientInvite : TransientClientEntity<InviteJsonModel>, IInvite
     /// <inheritdoc/>
     public Snowflake? ChannelId => Model.Channel?.Id;
 
+    /// <inheritdoc/>
+    public InviteType Type => Model.Type;
+
     /// <inheritdoc/>
     public string Code => Model.Code;
 
@@ -50,7 +53,7 @@ public TransientInvite(IClient client, InviteJsonModel model)
 
     public static IInvite Create(IClient client, InviteJsonModel model)
     {
-        return model.Guild.HasValue
+        return model.Type == InviteType.Guild
             ? new TransientGuildInvite(client, model)
             : new TransientInvite(client, model);
     }

src/Disqord.Core/Enums/InviteType.cs

@@ -0,0 +1,22 @@
+namespace Disqord;
+
+/// <summary>
+///     Represents the type of an invite.
+/// </summary>
+public enum InviteType
+{
+    /// <summary>
+    ///     An invitation to a guild.
+    /// </summary>
+    Guild = 0,
+
+    /// <summary>
+    ///     An invitation to a group private channel.
+    /// </summary>
+    Group = 1,
+
+    /// <summary>
+    ///     An invitation to add the inviter as a friend.
+    /// </summary>
+    Friend = 2
+}

src/Disqord.Core/Models/Invite/InviteJsonModel.cs

@@ -6,6 +6,9 @@ namespace Disqord.Models;
 
 public class InviteJsonModel : JsonModel
 {
+    [JsonProperty("type")]
+    public InviteType Type;
+
     [JsonProperty("code")]
     public string Code = null!;