Predict Flashes (#37640)

Co-authored-by: ScarKy0 <scarky0@onet.eu>

Content.Shared/Flash/DamagedByFlashingSystem.cs

@@ -0,0 +1,26 @@
+using Content.Shared.Flash.Components;
+using Content.Shared.Damage;
+
+namespace Content.Shared.Flash;
+
+public sealed class DamagedByFlashingSystem : EntitySystem
+{
+    [Dependency] private readonly DamageableSystem _damageable = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<DamagedByFlashingComponent, FlashAttemptEvent>(OnFlashAttempt);
+    }
+
+    // TODO: Attempt events should not be doing state changes. But using AfterFlashedEvent does not work because this entity cannot get the status effect.
+    // Best wait for Ed's status effect system rewrite.
+    private void OnFlashAttempt(Entity<DamagedByFlashingComponent> ent, ref FlashAttemptEvent args)
+    {
+        _damageable.TryChangeDamage(ent, ent.Comp.FlashDamage);
+
+        // TODO: It would be more logical if different flashes had different power,
+        // and the damage would be inflicted depending on the strength of the flash.
+    }
+}