Delete old group message when changing output channel.

agon/cogs/commands/set.py

@@ -251,6 +251,10 @@ class SetCog(commands.Cog, name="Set command."):
             channel (nextcord.abc.GuildChannel, optional): Channel to register.
                 Is a SlashOption. Limited to text channels, Defaults to None.
         """
+        if interaction.guild is None or interaction.channel is None:
+            agon_logger.warning("Set command was called with an interaction that had no guild or channel.")
+            return
+
         channel_id = interaction.channel.id if not channel else channel.id
 
         with Session(engine) as session:
@@ -262,11 +266,14 @@ class SetCog(commands.Cog, name="Set command."):
             if (group := session.scalar(stmt)) is None:
                 await interaction.response.send_message("Group or Category was not found.", ephemeral=True)
                 return
+            old_channel_id = group.channel_id
             group.channel_id = channel_id
             session.commit()
-            # TODO(imcompiling): delete the message and call send_highscore_message to send a new one. Bug needs fixed
+
-            # first.
+            old_channel = interaction.guild.get_channel(old_channel_id)
-            # 082
+            if old_channel and isinstance(old_channel, nextcord.TextChannel | nextcord.Thread) and group.message_id:
+                await old_channel.get_partial_message(group.message_id).delete()
+
         await interaction.send(f"Registered <#{channel_id}>.", ephemeral=True)
 
     @group.subcommand(