Add check if mouth is covered for changeling devour (#44677)

* no more eating in solars

* forgor to remove unused import

* address review

* clean

---------

Co-authored-by: ScarKy0 <scarky0@onet.eu>

Content.Shared/Nutrition/EntitySystems/IngestionSystem.API.cs

@@ -58,12 +58,23 @@ public sealed partial class IngestionSystem
         return AttemptIngest(user, user, ingested, false);
     }
 
+    /// <summary>
+    /// Check if the action user has an unblocked mouth.
+    /// </summary>
+    /// <param name="user">The mouth action's user to check</param>
+    /// <param name="flags">The slots to check that are not being blocked.</param>
+    /// <returns>True if the user has a free mouth, otherwise False</returns>
+    public bool HasMouthAvailable(EntityUid user, SlotFlags flags = DefaultFlags)
+    {
+        return HasMouthAvailable(user, user, flags);
+    }
+
     /// <summary>
     ///     Check whether we have an open pie-hole that's in range.
     /// </summary>
     /// <param name="user">The one performing the action</param>
     /// <param name="target">The target whose mouth is checked</param>
-    /// <returns></returns>
+    /// <returns>True if the user has a free mouth that can reach the target, otherwise False</returns>
     public bool HasMouthAvailable(EntityUid user, EntityUid target)
     {
         return HasMouthAvailable(user, target, DefaultFlags);

Content.Shared/Nutrition/EntitySystems/IngestionSystem.cs

@@ -543,7 +543,7 @@ public sealed partial class IngestionSystem : EntitySystem
 
     private void OnMouthUncoveredActionAttempt(Entity<ActionRequireMouthUncoveredComponent> ent, ref ActionAttemptEvent args)
     {
-        if (!HasMouthAvailable(args.User, args.User, ent.Comp.Slots))
+        if (!HasMouthAvailable(args.User, ent.Comp.Slots))
             args.Cancelled = true;
     }
 }

Resources/Prototypes/Actions/changeling.yml

@@ -47,6 +47,7 @@
     iconOn: { sprite : Interface/Actions/changeling.rsi, state: "devour_on" }
     itemIconStyle: BigAction
     priority: 1
+  - type: ActionRequireMouthUncovered
   - type: TargetAction
   - type: EntityTargetAction
     event: !type:ChangelingDevourActionEvent