Fix two interaction prediction issues (#7356)

Content.Server/Emag/EmagSystem.cs

@@ -1,10 +1,25 @@
+using Content.Shared.Administration.Logs;
+using Content.Shared.Database;
 using Content.Shared.Emag.Components;
 using Content.Shared.Emag.Systems;
+using Content.Shared.Interaction;
+using Content.Shared.Popups;
+using Robust.Shared.Player;
 
 namespace Content.Server.Emag
 {
     public sealed class EmagSystem : EntitySystem
     {
+        [Dependency] private readonly SharedPopupSystem _popupSystem = default!;
+        [Dependency] private readonly SharedAdminLogSystem _adminLog = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<EmagComponent, AfterInteractEvent>(OnAfterInteract);
+        }
+
         public override void Update(float frameTime)
         {
             base.Update(frameTime);
@@ -28,5 +43,27 @@ namespace Content.Server.Emag
                 emag.Charges++;
             }
         }
+
+        private void OnAfterInteract(EntityUid uid, EmagComponent component, AfterInteractEvent args)
+        {
+            if (!args.CanReach || args.Target == null)
+                return;
+
+            if (component.Charges <= 0)
+            {
+                _popupSystem.PopupEntity(Loc.GetString("emag-no-charges"), args.User, Filter.Entities(args.User));
+                return;
+            }
+
+            var emaggedEvent = new GotEmaggedEvent(args.User);
+            RaiseLocalEvent(args.Target.Value, emaggedEvent, false);
+            if (emaggedEvent.Handled)
+            {
+                _popupSystem.PopupEntity(Loc.GetString("emag-success", ("target", args.Target)), args.User, Filter.Entities(args.User));
+                _adminLog.Add(LogType.Emag, LogImpact.High, $"{ToPrettyString(args.User):player} emagged {ToPrettyString(args.Target.Value):target}");
+                component.Charges--;
+                return;
+            }
+        }
     }
 }