Adds disposal mailing units (again) (#7630)

Content.Shared/Disposal/Components/SharedDisposalUnitComponent.cs

@@ -13,6 +13,10 @@ namespace Content.Shared.Disposal.Components
         /// </summary>
         public List<EntityUid> RecentlyEjected = new();
 
+
+        [DataField("mobsCanEnter")]
+        public bool MobsCanEnter = true;
+
         [Serializable, NetSerializable]
         public enum Visuals : byte
         {

Content.Shared/Disposal/MailingUnitBoundUserInterfaceState.cs

@@ -0,0 +1,31 @@
+using Content.Shared.Disposal.Components;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Disposal;
+
+[Serializable, NetSerializable]
+public sealed class MailingUnitBoundUserInterfaceState: BoundUserInterfaceState, IEquatable<MailingUnitBoundUserInterfaceState>
+{
+    public string? Target;
+    public List<string> TargetList;
+    public string? Tag;
+    public SharedDisposalUnitComponent.DisposalUnitBoundUserInterfaceState DisposalState;
+
+    public MailingUnitBoundUserInterfaceState(SharedDisposalUnitComponent.DisposalUnitBoundUserInterfaceState disposalState, string? target, List<string> targetList, string? tag)
+    {
+        DisposalState = disposalState;
+        Target = target;
+        TargetList = targetList;
+        Tag = tag;
+    }
+
+    public bool Equals(MailingUnitBoundUserInterfaceState? other)
+    {
+        if (ReferenceEquals(null, other)) return false;
+        if (ReferenceEquals(this, other)) return true;
+        return DisposalState.Equals(other.DisposalState)
+               && Target == other.Target
+               && TargetList.Equals(other.TargetList)
+               && Tag == other.Tag;
+    }
+}

Content.Shared/Disposal/MailingUnitUiMessages.cs

@@ -0,0 +1,23 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Disposal;
+
+[Serializable, NetSerializable]
+public enum MailingUnitUiKey : byte
+{
+    Key
+}
+
+/// <summary>
+///     Message data sent from client to server when a disposal unit ui button is pressed.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class TargetSelectedMessage : BoundUserInterfaceMessage
+{
+    public readonly string? target;
+
+    public TargetSelectedMessage(string? target)
+    {
+        this.target = target;
+    }
+}

Content.Shared/Disposal/SharedDisposalUnitSystem.cs

@@ -66,11 +66,15 @@ namespace Content.Shared.Disposal
                 return false;
             }
 
+            //Check if the entity is a mob and if mobs can be inserted
+            if (EntityManager.HasComponent<MobStateComponent>(entity) && !component.MobsCanEnter)
+                return false;
 
             if (!EntityManager.TryGetComponent(entity, out IPhysBody? physics) ||
                 !physics.CanCollide && storable == null)
             {
-                if (!(EntityManager.TryGetComponent(entity, out MobStateComponent? damageState) && damageState.IsDead()))
+                if (!(EntityManager.TryGetComponent(entity, out MobStateComponent? damageState) &&
+                      (!component.MobsCanEnter || damageState.IsDead())))
                 {
                     return false;
                 }