Trading Outpost now has half buy-only and half sell-only pallets (#25955)

* Added new Buy & Sell specific cargo pallets

* Remapped trading outpost with new pallets, tweaked texture

* Removed debug message

* Fixed/Compacted conditional checking to let old pallets still work for backwards compatability

* Update Content.Server/Cargo/Components/CargoPalletComponent.cs

Alright, updating all the references to it.

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

* Changed textures, changed to enum instead of string for pallet type check

* Few minor code tweaks/formatting fixes

* Missed the prototype change

* Update Content.Server/Cargo/Components/CargoPalletComponent.cs

* Update Content.Server/Cargo/Systems/CargoSystem.Shuttle.cs

---------

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Cargo/Components/CargoPalletComponent.cs

@@ -1,7 +1,26 @@
 namespace Content.Server.Cargo.Components;
+using Content.Shared.Actions;
+using Robust.Shared.Serialization.TypeSerializers.Implementations;
 
 /// <summary>
 /// Any entities intersecting when a shuttle is recalled will be sold.
 /// </summary>
+
+[Flags]
+public enum BuySellType : byte
+{
+    Buy = 1 << 0,
+    Sell = 1 << 1,
+    All = Buy | Sell
+}
+
+
 [RegisterComponent]
-public sealed partial class CargoPalletComponent : Component {}
+public sealed partial class CargoPalletComponent : Component
+{
+    /// <summary>
+    /// Whether the pad is a buy pad, a sell pad, or all.
+    /// </summary>
+    [DataField]
+    public BuySellType PalletType;
+}

Content.Server/Cargo/Systems/CargoSystem.Orders.cs

@@ -205,7 +205,7 @@ namespace Content.Server.Cargo.Systems
             // Try to fulfill from any station where possible, if the pad is not occupied.
             foreach (var trade in _listEnts)
             {
-                var tradePads = GetCargoPallets(trade);
+                var tradePads = GetCargoPallets(trade, BuySellType.Buy);
                 _random.Shuffle(tradePads);
 
                 var freePads = GetFreeCargoPallets(trade, tradePads);

Content.Server/Cargo/Systems/CargoSystem.Shuttle.cs

@@ -173,13 +173,16 @@ public sealed partial class CargoSystem
     /// </summary>
     private int GetCargoSpace(EntityUid gridUid)
     {
-        var space = GetCargoPallets(gridUid).Count;
+        var space = GetCargoPallets(gridUid, BuySellType.Buy).Count;
         return space;
     }
 
-    private List<(EntityUid Entity, CargoPalletComponent Component, TransformComponent PalletXform)> GetCargoPallets(EntityUid gridUid)
+    /// GetCargoPallets(gridUid, BuySellType.Sell) to return only Sell pads
+    /// GetCargoPallets(gridUid, BuySellType.Buy) to return only Buy pads
+    private List<(EntityUid Entity, CargoPalletComponent Component, TransformComponent PalletXform)> GetCargoPallets(EntityUid gridUid, BuySellType requestType = BuySellType.All)
     {
         _pads.Clear();
+
         var query = AllEntityQuery<CargoPalletComponent, TransformComponent>();
 
         while (query.MoveNext(out var uid, out var comp, out var compXform))
@@ -190,7 +193,13 @@ public sealed partial class CargoSystem
                 continue;
             }
 
+            if ((requestType & comp.PalletType) == 0)
+            {
+                continue;
+            }
+
             _pads.Add((uid, comp, compXform));
+
         }
 
         return _pads;
@@ -250,7 +259,7 @@ public sealed partial class CargoSystem
         amount = 0;
         toSell = new HashSet<EntityUid>();
 
-        foreach (var (palletUid, _, _) in GetCargoPallets(gridUid))
+        foreach (var (palletUid, _, _) in GetCargoPallets(gridUid, BuySellType.Sell))
         {
             // Containers should already get the sell price of their children so can skip those.
             _setEnts.Clear();