Blindness refactor (#15705)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Eye/Blinding/Systems/BlindfoldSystem.cs

@@ -0,0 +1,34 @@
+using Content.Shared.Eye.Blinding.Components;
+using Content.Shared.Inventory.Events;
+using Content.Shared.Inventory;
+
+namespace Content.Shared.Eye.Blinding.Systems;
+
+public sealed class BlindfoldSystem : EntitySystem
+{
+    [Dependency] private readonly BlindableSystem _blindableSystem = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<BlindfoldComponent, GotEquippedEvent>(OnEquipped);
+        SubscribeLocalEvent<BlindfoldComponent, GotUnequippedEvent>(OnUnequipped);
+        SubscribeLocalEvent<BlindfoldComponent, InventoryRelayedEvent<CanSeeAttemptEvent>>(OnBlindfoldTrySee);
+    }
+
+    private void OnBlindfoldTrySee(EntityUid uid, BlindfoldComponent component, InventoryRelayedEvent<CanSeeAttemptEvent> args)
+    {
+        args.Args.Cancel();
+    }
+
+    private void OnEquipped(EntityUid uid, BlindfoldComponent component, GotEquippedEvent args)
+    {
+        _blindableSystem.UpdateIsBlind(args.Equipee);
+    }
+
+    private void OnUnequipped(EntityUid uid, BlindfoldComponent component, GotUnequippedEvent args)
+    {
+        _blindableSystem.UpdateIsBlind(args.Equipee);
+    }
+}