Fix sub commands being interpreted as a parameter for autocomplete

src/Discord.Net.Rest/API/Common/AutocompleteInteractionDataOption.cs

@@ -15,10 +15,13 @@ namespace Discord.API
         [JsonProperty("name")]
         public string Name { get; set; }
 
+        [JsonProperty("options")]
+        public Optional<AutocompleteInteractionDataOption[]> Options { get; set; }
+
         [JsonProperty("value")]
-        public object Value { get; set; }
+        public Optional<object> Value { get; set; }
 
         [JsonProperty("focused")]
-        public bool Focused { get; set; }
+        public Optional<bool> Focused { get; set; }
     }
 }

src/Discord.Net.WebSocket/Entities/Interaction/Slash Commands/SocketAutocompleteInteractionData.cs

@@ -46,12 +46,12 @@ namespace Discord.WebSocket
 
         internal SocketAutocompleteInteractionData(DataModel model)
         {
-            var options = model.Options.Select(x => new AutocompleteOption(x.Type, x.Name, x.Value, x.Focused));
+            var options = model.Options.SelectMany(x => GetOptions(x));
 
             Current = options.FirstOrDefault(x => x.Focused);
             Options = options.ToImmutableArray();
 
-            if (Options?.Count == 1 && Current == null)
+            if (options != null && options.Count() == 1 && Current == null)
                 Current = Options.FirstOrDefault();
 
             CommandName = model.Name;
@@ -59,5 +59,21 @@ namespace Discord.WebSocket
             Type = model.Type;
             Version = model.Version;
         }
+
+        private List<AutocompleteOption> GetOptions(API.AutocompleteInteractionDataOption model)
+        {
+            List<AutocompleteOption> options = new List<AutocompleteOption>();
+
+            if (model.Options.IsSpecified)
+            {
+                options.AddRange(model.Options.Value.SelectMany(x => GetOptions(x)));
+            }
+            else if(model.Focused.IsSpecified)
+            {
+                options.Add(new AutocompleteOption(model.Type, model.Name, model.Value, model.Focused.Value));
+            }
+
+            return options;
+        }
     }
 }