Generalized Store System (#10201)

Content.Shared/Store/ListingCondition.cs

@@ -0,0 +1,23 @@
+using JetBrains.Annotations;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Store;
+
+/// <summary>
+/// Used to define a complicated condition that requires C#
+/// </summary>
+[ImplicitDataDefinitionForInheritors]
+[MeansImplicitUse]
+public abstract class ListingCondition
+{
+    /// <summary>
+    /// Determines whether or not a certain entity can purchase a listing.
+    /// </summary>
+    /// <returns>Whether or not the listing can be purchased</returns>
+    public abstract bool Condition(ListingConditionArgs args);
+}
+
+/// <param name="Buyer">The person purchasing the listing</param>
+/// <param name="Listing">The liting itself</param>
+/// <param name="EntityManager">An entitymanager for sane coding</param>
+public readonly record struct ListingConditionArgs(EntityUid Buyer, EntityUid? StoreEntity, ListingData Listing, IEntityManager EntityManager);