Add unbuckling entities that are moved away from their straps (#1437)

* Add unbuckling entities that move away from their straps

* Remove range constraint from movement unbuckling check

* Fix setting the wrong positions when buckling

* Fix beds making you sleep for the rest of your life

Content.Server/GameObjects/EntitySystems/BuckleSystem.cs

@@ -1,14 +1,46 @@
 using Content.Server.GameObjects.Components.Buckle;
-using Content.Server.GameObjects.Components.Mobs;
 using Content.Server.GameObjects.EntitySystems.Click;
+using JetBrains.Annotations;
 using Robust.Server.GameObjects.EntitySystems;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Components.Transform;
 using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Interfaces.Map;
+using Robust.Shared.IoC;
 
 namespace Content.Server.GameObjects.EntitySystems
 {
+    [UsedImplicitly]
     public class BuckleSystem : EntitySystem
     {
+#pragma warning disable 649
+        [Dependency] private readonly IMapManager _mapManager;
+#pragma warning restore 649
+
+        /// <summary>
+        ///     Checks if a buckled entity should be unbuckled from moving
+        ///     too far from its strap.
+        /// </summary>
+        /// <param name="moveEvent">The move event of a buckled entity.</param>
+        private void MoveEvent(MoveEvent moveEvent)
+        {
+            if (!moveEvent.Sender.TryGetComponent(out BuckleComponent buckle) ||
+                buckle.BuckledTo == null ||
+                !buckle.BuckleOffset.HasValue)
+            {
+                return;
+            }
+
+            var bucklePosition = buckle.BuckledTo.Owner.Transform.GridPosition.Offset(buckle.BuckleOffset.Value);
+
+            if (moveEvent.NewPosition.InRange(_mapManager, bucklePosition, 0.2f))
+            {
+                return;
+            }
+
+            buckle.TryUnbuckle(buckle.Owner, true);
+        }
+
         public override void Initialize()
         {
             base.Initialize();
@@ -17,6 +49,8 @@ namespace Content.Server.GameObjects.EntitySystems
 
             UpdatesAfter.Add(typeof(InteractionSystem));
             UpdatesAfter.Add(typeof(InputSystem));
+
+            SubscribeLocalEvent<MoveEvent>(MoveEvent);
         }
 
         public override void Update(float frameTime)