StaminaDamageOnTriggerComponent (#39607)

* InflictStaminaOnTriggerSystem

Surprised this wasn't done alongside the damage one.

* Correct docstring

* Moar docstring changes!!!

* Resolve PR comment

* a

* Update Content.Shared/Trigger/Systems/StaminaDamageOnTriggerSystem.cs

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Content.Shared/Trigger/Systems/StaminaDamageOnTriggerSystem.cs

@@ -0,0 +1,42 @@
+using Content.Shared.Damage;
+using Content.Shared.Damage.Systems;
+using Content.Shared.Trigger.Components.Effects;
+
+namespace Content.Shared.Trigger.Systems;
+
+public sealed class StaminaDamageOnTriggerSystem : EntitySystem
+{
+    [Dependency] private readonly SharedStaminaSystem _stamina = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<StaminaDamageOnTriggerComponent, TriggerEvent>(OnTrigger);
+    }
+
+    private void OnTrigger(Entity<StaminaDamageOnTriggerComponent> 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;
+
+        var ev = new BeforeStaminaDamageOnTriggerEvent(ent.Comp.Stamina, target.Value);
+        RaiseLocalEvent(ent.Owner, ref ev);
+
+        _stamina.TakeStaminaDamage(target.Value, ev.Stamina, source: args.User, with: ent.Owner, ignoreResist: ent.Comp.IgnoreResistances);
+
+        args.Handled = true;
+    }
+}
+
+/// <summary>
+/// Raised on an entity before it inflicts stamina due to StaminaDamageOnTriggerComponent.
+/// Used to modify the stamina that will be inflicted.
+/// </summary>
+[ByRefEvent]
+public record struct BeforeStaminaDamageOnTriggerEvent(float Stamina, EntityUid Tripper);