Изменение отображения скидок в аплинке (#266)

* Better sales

* Sale item restrictions

Content.Server/Store/Systems/StoreSystem.Listings.cs

@@ -38,8 +38,10 @@ public sealed partial class StoreSystem
 
                 if (listing.Cost.Any(x => x.Value.Int() != newCost[x.Key].Int()))
                 {
+                    var key = listing.Cost.First(x => x.Value > 0).Key;
+                    listingData.OldCost = listing.Cost;
+                    listingData.SaleAmount = 100 - (newCost[key] / listing.Cost[key] * 100).Int();
                     listingData.Cost = newCost;
-                    listingData.SaleAmount = 100 - (int) MathF.Round(sale.Item1 * 100);
                     listingData.Categories = new() {sale.Item2};
                 }
             }

Content.Server/Store/Systems/StoreSystem.Ui.cs

@@ -183,6 +183,14 @@ public sealed partial class StoreSystem
         listing.PurchaseAmount++; //track how many times something has been purchased
         _audio.PlayEntity(component.BuySuccessSound, msg.Session, uid); //cha-ching!
 
+        //WD START
+        if (listing.SaleLimit != 0 && listing.SaleAmount > 0 && listing.PurchaseAmount >= listing.SaleLimit)
+        {
+            listing.SaleAmount = 0;
+            listing.Cost = listing.OldCost;
+        }
+        //WD END
+
         UpdateUserInterface(buyer, uid, component);
     }