Fix blindness and UIs (#12326)

* fix part 1

* fix blindness and BUIs

* remove extra file

Content.Server/Eye/Blinding/ActivatableUIRequiresVisionSystem.cs

@@ -0,0 +1,60 @@
+using Content.Shared.Eye.Blinding;
+using Content.Server.UserInterface;
+using Content.Server.Popups;
+using Robust.Shared.Player;
+using Robust.Server.GameObjects;
+
+namespace Content.Server.Eye.Blinding
+{
+    public sealed class ActivatableUIRequiresVisionSystem : EntitySystem
+    {
+        [Dependency] private readonly ActivatableUISystem _activatableUISystem = default!;
+        [Dependency] private readonly PopupSystem _popupSystem = default!;
+        [Dependency] private readonly UserInterfaceSystem _userInterfaceSystem = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<ActivatableUIRequiresVisionComponent, ActivatableUIOpenAttemptEvent>(OnOpenAttempt);
+            SubscribeLocalEvent<BlindableComponent, BlindnessChangedEvent>(OnBlindnessChanged);
+        }
+
+        private void OnOpenAttempt(EntityUid uid, ActivatableUIRequiresVisionComponent component, ActivatableUIOpenAttemptEvent args)
+        {
+            if (args.Cancelled)
+                return;
+
+            if (TryComp<BlindableComponent>(args.User, out var blindable) && blindable.Sources > 0)
+            {
+                _popupSystem.PopupCursor(Loc.GetString("blindness-fail-attempt"), Filter.Entities(args.User), Shared.Popups.PopupType.MediumCaution);
+                args.Cancel();
+            }
+        }
+
+        private void OnBlindnessChanged(EntityUid uid, BlindableComponent component, BlindnessChangedEvent args)
+        {
+            if (!args.Blind)
+                return;
+
+            if (!TryComp<ActorComponent>(uid, out var actor))
+                return;
+
+            var uiList = _userInterfaceSystem.GetAllUIsForSession(actor.PlayerSession);
+            if (uiList == null)
+                return;
+
+            Queue<BoundUserInterface> closeList = new(); // foreach collection modified moment
+
+            foreach (var ui in uiList)
+            {
+                if (HasComp<ActivatableUIRequiresVisionComponent>(ui.Owner))
+                    closeList.Enqueue(ui);
+            }
+
+            foreach (var ui in closeList)
+            {
+                _userInterfaceSystem.CloseUi(ui, actor.PlayerSession);
+            }
+        }
+    }
+}