Predict ActivatableUIRequiresPower (#28405)

A lot of BUIs aren't going to handle the state coming in cleanly but we can fix em as we find em.

Content.Client/Power/ActivatableUIRequiresPowerSystem.cs

@@ -1,21 +1,27 @@
+using Content.Client.Power.EntitySystems;
+using Content.Shared.Popups;
 using Content.Shared.Power.Components;
+using Content.Shared.Power.EntitySystems;
 using Content.Shared.UserInterface;
 using Content.Shared.Wires;
 
 namespace Content.Client.Power;
 
-public sealed class ActivatableUIRequiresPowerSystem : EntitySystem
+public sealed class ActivatableUIRequiresPowerSystem : SharedActivatableUIRequiresPowerSystem
 {
-    public override void Initialize()
-    {
-        base.Initialize();
+    [Dependency] private readonly SharedPopupSystem _popup = default!;
 
-        SubscribeLocalEvent<ActivatableUIRequiresPowerComponent, ActivatableUIOpenAttemptEvent>(OnActivate);
-    }
-
-    private void OnActivate(EntityUid uid, ActivatableUIRequiresPowerComponent component, ActivatableUIOpenAttemptEvent args)
+    protected override void OnActivate(Entity<ActivatableUIRequiresPowerComponent> ent, ref ActivatableUIOpenAttemptEvent args)
     {
-        // Client can't predict the power properly at the moment so rely upon the server to do it.
+        if (args.Cancelled || this.IsPowered(ent.Owner, EntityManager))
+        {
+            return;
+        }
+
+        if (TryComp<WiresPanelComponent>(ent.Owner, out var panel) && panel.Open)
+            return;
+
+        _popup.PopupClient(Loc.GetString("base-computer-ui-component-not-powered", ("machine", ent.Owner)), args.User, args.User);
         args.Cancel();
     }
 }