Add invite URL and check for expected permissions

ahtcg_bot.py

@@ -63,6 +63,17 @@ class ArkhamDBUpdater(discord.Client):
 
     async def on_ready(self) -> None:
         logging.info(f"Logged in as {self.user} (ID: {self.user.id})")
+        expected_permissions = permissions = discord.Permissions(
+            read_messages=True,
+            read_message_history=True,
+            send_messages=True,
+            use_application_commands=True,
+        )
+        logging.info(
+            "Invite URL: "
+            + discord.utils.oauth_url(self.user.id, permissions=expected_permissions)
+        )
+
         logging.info("Enabled on servers:")
         async for guild in self.fetch_guilds(limit=150):
             logging.info(f"  - {guild.name}")
@@ -70,8 +81,17 @@ class ArkhamDBUpdater(discord.Client):
 
         for channel_id in self.channel_list:
             channel = self.get_channel(channel_id)
-            print(channel)
-            print(channel.permissions_for(self.user))
+            permissions = channel.permissions_for(channel.guild.me)
+            missing_permissions = (
+                permissions & expected_permissions
+            ) ^ expected_permissions
+            if missing_permissions.value:
+                logging.warning(
+                    f"channel: '{channel}' missing permissions: {missing_permissions}"
+                )
+            else:
+                logging.info(f"channel '{channel}' permissions OK")
+            logging.debug(f"channel '{channel}' permissions: {dict(permissions)}")
 
         await self.setup_commands()