Make sure trader has enough stock before selling (!278)

Make sure trader has enough stock before selling

Reviewed-on: https://dev.sp-tarkov.com/SPT-AKI/Server/pulls/278
Co-authored-by: Leaves <mwarciel@gmail.com>
Co-committed-by: Leaves <mwarciel@gmail.com>

project/src/helpers/TradeHelper.ts

@@ -158,6 +158,14 @@ export class TradeHelper
                     );
                 }
 
+                // Check if trader has enough stock
+                if (itemPurchased.upd.StackObjectsCount < buyCount)
+                {
+                    throw new Error(
+                        `Unable to purchase ${buyCount} items, this would exceed the remaining stock left ${itemPurchased.upd.StackObjectsCount} from the traders assort: ${buyRequestData.tid} this refresh`,
+                    );
+                }
+
                 // Decrement trader item count
                 itemPurchased.upd.StackObjectsCount -= buyCount;