Make all implants unable to be implanted more than once (#26250)

* Make mind shield implants unable to be implanted more than once

* Default AllowMultipleImplants to false and update implanters.yml

* Use TryComp instead of TryGetComponent

* Deny multiple implants for fun implants too.

* Make comment more precise

Content.Server/Implants/ImplanterSystem.cs

@@ -1,3 +1,4 @@
+using System.Linq;
 using Content.Server.Popups;
 using Content.Shared.DoAfter;
 using Content.Shared.IdentityManagement;
@@ -57,6 +58,17 @@ public sealed partial class ImplanterSystem : SharedImplanterSystem
                 return;
             }
 
+            // Check if we are trying to implant a implant which is already implanted
+            if (implant.HasValue && !component.AllowMultipleImplants && CheckSameImplant(target, implant.Value))
+            {
+                var name = Identity.Name(target, EntityManager, args.User);
+                var msg = Loc.GetString("implanter-component-implant-already", ("implant", implant), ("target", name));
+                _popup.PopupEntity(msg, target, args.User);
+                args.Handled = true;
+                return;
+            }
+
+
             //Implant self instantly, otherwise try to inject the target.
             if (args.User == target)
                 Implant(target, target, uid, component);
@@ -67,6 +79,15 @@ public sealed partial class ImplanterSystem : SharedImplanterSystem
         args.Handled = true;
     }
 
+    public bool CheckSameImplant(EntityUid target, EntityUid implant)
+    {
+        if (!TryComp<ImplantedComponent>(target, out var implanted))
+            return false;
+
+        var implantPrototype = Prototype(implant);
+        return implanted.ImplantContainer.ContainedEntities.Any(entity => Prototype(entity) == implantPrototype);
+    }
+
     /// <summary>
     /// Attempt to implant someone else.
     /// </summary>