public void SaveSale(SaleModel saleInfo, string cashierId)
        {
            // TODO: Make this SOLID/DRY/Better
            // Start filling in the sale detail models we will save to the database
            List <SaleDetailDBModel> details = new List <SaleDetailDBModel>();
            var taxRate = ConfigHelper.GetTaxRate() / 100;

            foreach (var item in saleInfo.SaleDetails)
            {
                var detail = new SaleDetailDBModel
                {
                    ProductId = item.ProductId,
                    Quantity  = item.Quantity
                };

                //Get the information about this product
                var productInfo = _productData.GetProductById(detail.ProductId);

                if (productInfo == null)
                {
                    throw new Exception($"The product Id of {detail.ProductId} could not be found in the database.");
                }

                detail.PurchasePrice = (productInfo.RetailPrice * detail.Quantity);

                if (productInfo.IsTaxable)
                {
                    detail.Tax = (detail.PurchasePrice * taxRate);
                }

                details.Add(detail);
            }

            // Create the Sale Model
            SaleDBModel sale = new SaleDBModel
            {
                SubTotal  = details.Sum(x => x.PurchasePrice),
                Tax       = details.Sum(x => x.Tax),
                CashierId = cashierId
            };

            sale.Total = sale.SubTotal + sale.Tax;



            try
            {
                _sql.StartTransaction("TRMData");

                // Save the sale model
                _sql.SaveDataInTransaction("dbo.spSale_Insert", sale);

                // Get the ID from the sale model
                sale.Id = _sql.LoadDataInTransaction <int, dynamic>("spSale_Lookup", new { sale.CashierId, sale.SaleDate }).FirstOrDefault();

                // Finish filling in the sale detail models
                foreach (var item in details)
                {
                    item.SaleId = sale.Id;
                    // Save the sale detail models
                    _sql.SaveDataInTransaction("dbo.spSaleDetail_Insert", item);
                }

                _sql.Committransaction();
            }
            catch
            {
                _sql.RollbackTransaction();
                throw;
            }
        }