Add and use interaction command hooks for BeforeExecute, AfterExecute, OnException and GetExceptionResponse

src/Core/Interactions/IInteractionBase.cs

@@ -1,9 +1,13 @@
+using System;
+using Geekbot.Core.Interactions.Response;
+
 namespace Geekbot.Core.Interactions
 {
     public interface IInteractionBase
     {
         void BeforeExecute();
         void AfterExecute();
-        void OnException();
+        void OnException(Exception e);
+        InteractionResponse GetExceptionResponse();
     }
 }

src/Core/Interactions/InteractionBase.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading.Tasks;
 using Geekbot.Core.Interactions.ApplicationCommand;
 using Geekbot.Core.Interactions.Request;
@@ -7,25 +8,41 @@ namespace Geekbot.Core.Interactions
 {
     public abstract class InteractionBase : IInteractionBase
     {
-        protected virtual void BeforeExecute()
+        public InteractionBase() {}
+        
+        public virtual void BeforeExecute()
         {
+            
         }
 
-        protected virtual void AfterExecute()
+        public virtual void AfterExecute()
         {
             
         }
         
-        protected virtual void OnException()
+        public virtual void OnException(Exception exception)
         {
             
         }
 
+        public virtual InteractionResponse GetExceptionResponse()
+        {
+            return new InteractionResponse()
+            {
+                Type = InteractionResponseType.ChannelMessageWithSource,
+                Data = new()
+                {
+                    Content = "Something went wrong :confused:"
+                }
+            };
+        }
+
         public abstract Command GetCommandInfo();
         public abstract Task<InteractionResponse> Exec(Interaction interaction);
         
         void IInteractionBase.BeforeExecute() => this.BeforeExecute();
         void IInteractionBase.AfterExecute() => this.AfterExecute();
-        void IInteractionBase.OnException() => this.OnException();
+        void IInteractionBase.OnException(Exception e) => this.OnException(e);
+        InteractionResponse IInteractionBase.GetExceptionResponse() => this.GetExceptionResponse();
     }
 }

src/Core/Interactions/InteractionCommandManager.cs

@@ -40,8 +40,23 @@ namespace Geekbot.Core.Interactions
         {
             var type = _commands[interaction.Data.Name];
             var command = (InteractionBase)Activator.CreateInstance(type);
-            
+
-            return await command.Exec(interaction);
+            InteractionResponse response;
+            command.BeforeExecute();
+            try
+            {
+                response = await command.Exec(interaction);
+            }
+            catch (Exception e)
+            {
+                command.OnException(e);
+                response = command.GetExceptionResponse();
+            }
+            finally
+            {
+                command.AfterExecute();
+            }
+            return response;
         }
     }
 }