Blindness refactor (#15705)

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

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

@@ -0,0 +1,35 @@
+using Content.Shared.Eye.Blinding.Components;
+
+namespace Content.Shared.Eye.Blinding.Systems;
+
+public sealed class TemporaryBlindnessSystem : EntitySystem
+{
+    public const string BlindingStatusEffect = "TemporaryBlindness";
+
+    [Dependency] private readonly BlindableSystem _blindableSystem = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<TemporaryBlindnessComponent, ComponentStartup>(OnStartup);
+        SubscribeLocalEvent<TemporaryBlindnessComponent, ComponentShutdown>(OnShutdown);
+        SubscribeLocalEvent<TemporaryBlindnessComponent, CanSeeAttemptEvent>(OnBlindTrySee);
+    }
+
+    private void OnStartup(EntityUid uid, TemporaryBlindnessComponent component, ComponentStartup args)
+    {
+        _blindableSystem.UpdateIsBlind(uid);
+    }
+
+    private void OnShutdown(EntityUid uid, TemporaryBlindnessComponent component, ComponentShutdown args)
+    {
+        _blindableSystem.UpdateIsBlind(uid);
+    }
+
+    private void OnBlindTrySee(EntityUid uid, TemporaryBlindnessComponent component, CanSeeAttemptEvent args)
+    {
+        if (component.LifeStage <= ComponentLifeStage.Running)
+            args.Cancel();
+    }
+}