Predict DamagePopup (#36547)

* Predict DamagePopup

Pretty easy one.

* cleanup and localize

* oops

---------

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

Content.Shared/Damage/Systems/DamagePopupSystem.cs

@@ -0,0 +1,48 @@
+using Content.Shared.Damage.Components;
+using Content.Shared.Interaction;
+using Content.Shared.Popups;
+
+namespace Content.Shared.Damage.Systems;
+
+public sealed class DamagePopupSystem : EntitySystem
+{
+    [Dependency] private readonly SharedPopupSystem _popupSystem = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<DamagePopupComponent, DamageChangedEvent>(OnDamageChange);
+        SubscribeLocalEvent<DamagePopupComponent, InteractHandEvent>(OnInteractHand);
+    }
+
+    private void OnDamageChange(Entity<DamagePopupComponent> ent, ref DamageChangedEvent args)
+    {
+        if (args.DamageDelta != null)
+        {
+            var damageTotal = args.Damageable.TotalDamage;
+            var damageDelta = args.DamageDelta.GetTotal();
+
+            var msg = ent.Comp.Type switch
+            {
+                DamagePopupType.Delta => damageDelta.ToString(),
+                DamagePopupType.Total => damageTotal.ToString(),
+                DamagePopupType.Combined => damageDelta + " | " + damageTotal,
+                DamagePopupType.Hit => "!",
+                _ => "Invalid type",
+            };
+
+            _popupSystem.PopupPredicted(msg, ent.Owner, args.Origin);
+        }
+    }
+
+    private void OnInteractHand(Entity<DamagePopupComponent> ent, ref InteractHandEvent args)
+    {
+        if (ent.Comp.AllowTypeChange)
+        {
+            var next = (DamagePopupType)(((int)ent.Comp.Type + 1) % Enum.GetValues<DamagePopupType>().Length);
+            ent.Comp.Type = next;
+            Dirty(ent);
+            _popupSystem.PopupPredicted(Loc.GetString("damage-popup-component-switched", ("setting", ent.Comp.Type)), ent.Owner, args.User);
+        }
+    }
+}