Trigger Refactor (#39034)

Content.Shared/Trigger/Systems/AddComponentsOnTriggerSystem.cs

@@ -0,0 +1,33 @@
+using Content.Shared.Trigger.Components.Effects;
+
+namespace Content.Shared.Trigger.Systems;
+
+public sealed partial class AddComponentsOnTriggerSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<AddComponentsOnTriggerComponent, TriggerEvent>(OnTrigger);
+    }
+
+    private void OnTrigger(Entity<AddComponentsOnTriggerComponent> ent, ref TriggerEvent args)
+    {
+        if (args.Key != null && !ent.Comp.KeysIn.Contains(args.Key))
+            return;
+
+        var target = ent.Comp.TargetUser ? args.User : ent.Owner;
+
+        if (target == null)
+            return;
+
+        if (ent.Comp.TriggerOnce && ent.Comp.Triggered)
+            return;
+
+        EntityManager.AddComponents(target.Value, ent.Comp.Components, ent.Comp.RemoveExisting);
+        ent.Comp.Triggered = true;
+        Dirty(ent);
+
+        args.Handled = true;
+    }
+}