wip, this turned into a maaaaaahooosive job

src/bnhtrade.Core/Logic/Inventory/SkuService.cs

@@ -0,0 +1,47 @@
+using bnhtrade.Core.Data.Database.UnitOfWork;
+using System;
+using System.Collections.Generic;
+using System.Data.SqlClient;
+using System.Transactions;
+using System.Windows.Forms;
+
+namespace bnhtrade.Core.Logic.Inventory
+{
+    public class SkuService : UnitOfWorkBase
+    {
+        public SkuService() : base() { }
+
+        internal SkuService(IUnitOfWork unitOfWork) : base(unitOfWork) { }
+
+        /// <summary>
+        /// Used for retriving an SKU ID by parameters. If no match, can create a new SKU if required.
+        /// </summary>
+        /// <param name="productId">The product Id for the SKU</param>
+        /// <param name="conditionId">The condition Id for the SKU</param>
+        /// <param name="accountTaxCodeId">The tax code Id for the SKU</param>
+        /// <param name="noMatchCreateNew">When set to true, if no match is made, function will create a new sku and return the id for that</param>
+        /// <returns>Return the id for the new or existing sku or, dependant on set parameters, 0 if not found</returns>
+        /// <exception cref="Exception"></exception>
+        public int GetSkuId(int productId, int conditionId, int accountTaxCodeId, bool noMatchCreateNew)
+        {
+            return WithUnitOfWork(uow =>
+            {
+                int? skuId = uow.SkuRepository.ReadSkuId(productId, conditionId, accountTaxCodeId);
+                if (skuId != null)
+                {
+                    return (int)skuId;
+                }
+                else if (noMatchCreateNew == false)
+                {
+                    return 0;
+                }
+                else
+                {
+                    int newSkuId = uow.SkuRepository.InsertNewSku(productId, conditionId, accountTaxCodeId);
+                    CommitIfOwned(uow);
+                    return newSkuId;
+                }
+            });
+        }
+    }
+}