NPC refactor (#10122)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/NPC/HTN/Preconditions/PulledPrecondition.cs

@@ -0,0 +1,27 @@
+using Content.Shared.Pulling;
+
+namespace Content.Server.NPC.HTN.Preconditions;
+
+/// <summary>
+/// Checks if the owner is being pulled or not.
+/// </summary>
+public sealed class PulledPrecondition : HTNPrecondition
+{
+    private SharedPullingSystem _pulling = default!;
+
+    [ViewVariables(VVAccess.ReadWrite)] [DataField("isPulled")] public bool IsPulled = true;
+
+    public override void Initialize(IEntitySystemManager sysManager)
+    {
+        base.Initialize(sysManager);
+        _pulling = sysManager.GetEntitySystem<SharedPullingSystem>();
+    }
+
+    public override bool IsMet(NPCBlackboard blackboard)
+    {
+        var owner = blackboard.GetValue<EntityUid>(NPCBlackboard.Owner);
+
+        return IsPulled && _pulling.IsPulled(owner) ||
+               !IsPulled && !_pulling.IsPulled(owner);
+    }
+}