- add: Toggleable night vision (#31)

* - add: Toggleable night vision

* - add: Add death squad huds & night vision

Content.Shared/_Miracle/Systems/SharedNightVisionSystem.cs

@@ -0,0 +1,44 @@
+using Content.Shared._White.Overlays;
+using Content.Shared.Actions;
+using Robust.Shared.Audio.Systems;
+
+namespace Content.Shared._Miracle.Systems;
+
+public abstract class SharedNightVisionSystem : EntitySystem
+{
+    [Dependency] private readonly SharedAudioSystem _audio = default!;
+    [Dependency] private readonly SharedActionsSystem _actions = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<NightVisionComponent, ToggleNightVisionEvent>(OnToggle);
+        SubscribeLocalEvent<NightVisionComponent, ComponentInit>(OnInit);
+        SubscribeLocalEvent<NightVisionComponent, ComponentRemove>(OnRemove);
+    }
+
+    private void OnRemove(EntityUid uid, NightVisionComponent component, ComponentRemove args)
+    {
+        _actions.RemoveAction(uid, component.ToggleActionEntity);
+        UpdateNightVision(uid, false);
+    }
+
+    private void OnInit(EntityUid uid, NightVisionComponent component, ComponentInit args)
+    {
+        _actions.AddAction(uid, ref component.ToggleActionEntity, component.ToggleAction);
+        UpdateNightVision(uid, component.IsActive);
+    }
+
+    protected virtual void UpdateNightVision(EntityUid uid, bool active) { }
+
+    private void OnToggle(EntityUid uid, NightVisionComponent component, ToggleNightVisionEvent args)
+    {
+        component.IsActive = !component.IsActive;
+        _audio.PlayPredicted(component.ToggleSound, uid, uid);
+        UpdateNightVision(uid, component.IsActive);
+        Dirty(uid, component);
+
+        args.Handled = true;
+    }
+}