Moves ID field to ListingData and adds BuyBeforeCondition (#22438)

Content.Server/Store/Conditions/BuyBeforeCondition.cs

@@ -0,0 +1,56 @@
+using Content.Server.Store.Components;
+using Content.Server.Store.Systems;
+using Content.Shared.Store;
+using Robust.Shared.Prototypes;
+
+namespace Content.Server.Store.Conditions;
+
+public sealed partial class BuyBeforeCondition : ListingCondition
+{
+    /// <summary>
+    ///     Required listing(s) needed to purchase before this listing is available
+    /// </summary>
+    [DataField(required: true)]
+    public HashSet<ProtoId<ListingPrototype>> Whitelist;
+
+    /// <summary>
+    ///     Listing(s) that if bought, block this purchase, if any.
+    /// </summary>
+    public HashSet<ProtoId<ListingPrototype>>? Blacklist;
+
+    public override bool Condition(ListingConditionArgs args)
+    {
+        if (!args.EntityManager.TryGetComponent<StoreComponent>(args.StoreEntity, out var storeComp))
+            return false;
+
+        var allListings = storeComp.Listings;
+
+        var purchasesFound = false;
+
+        if (Blacklist != null)
+        {
+            foreach (var blacklistListing in Blacklist)
+            {
+                foreach (var listing in allListings)
+                {
+                    if (listing.ID == blacklistListing.Id && listing.PurchaseAmount > 0)
+                        return false;
+                }
+            }
+        }
+
+        foreach (var requiredListing in Whitelist)
+        {
+            foreach (var listing in allListings)
+            {
+                if (listing.ID == requiredListing.Id)
+                {
+                    purchasesFound = listing.PurchaseAmount > 0;
+                    break;
+                }
+            }
+        }
+
+        return purchasesFound;
+    }
+}