Added invoice export function and started implementation of unitofwork pattern (#43)

* complete read invoices from db

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* updated nuget package spapi

* WIP

* wip, now test

* wip, jut need to fix tax inclusive line amounts not supported

* wip

* wip, before I f everything up

* no, it complies now, this is the one before I f everything up

* wip

* wip

* wip, logic ready for testing

* wip it builds!!!!

* wip tested, working, need to complete the gui section

* wip

* wip

* wip - created export invoice data delete, time for testing

* wip testing phase

* wip - delete function fully tested and working

* wip on to sorting out the issue with settlement invoices not tallying

* wip

* wip

* wip

* wip

* wip before I complete change the ReadInvoiceLineItem sections

* that appears to have worked, on with the main quest

* no it's doesn't work, saving before i remove the confusing cache system (just use a dictionary!!)

* wipping picadilli

* wip

* wip

* implemented uow on inovice export, now for testing

* wip

* wip all tested do invoice currency convertion fearure

* wip

* pretty much done so long as xero accepts the exported invoices

* Complete!

src/bnhtrade.Core/Logic/Validate/AccountInvoiceLineItem.cs

@@ -0,0 +1,23 @@
+using bnhtrade.Core.Model.Account;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace bnhtrade.Core.Logic.Validate
+{
+    public class AccountInvoiceLineItem : Validate
+    {
+        public bool IsValid(Model.Account.InvoiceLineItem invoiceLineItem)
+        {
+            return base.IsValid(invoiceLineItem);
+        }
+
+        public bool IsValid(List<Model.Account.InvoiceLineItem> invoiceLineItems)
+        {
+            return base.IsValid(invoiceLineItems);
+        }
+    }
+}

src/bnhtrade.Core/Logic/Validate/AmazonSettlement.cs

@@ -1,4 +1,5 @@
-using System;
+using bnhtrade.Core.Model.Amazon;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -56,7 +57,7 @@ namespace bnhtrade.Core.Logic.Validate
                 {
                     if (ValidateMarketPlaceName) { ValidationResultAdd("MarketPlaceName is a required value."); }
                 }
-                else { IsValidMarketPlaceName(settlementList[i].MarketPlaceName); }
+                else { IsValidMarketPlaceName(settlementList[i].MarketPlace.GetMarketplaceUrl()); }
 
                 if (!settlementList[i].SettlementIdIsSet) { ValidationResultAdd("SettlementId is a required value."); }
                 else { IsValidSettlementId(settlementList[i].SettlementId); }
@@ -315,23 +316,6 @@ namespace bnhtrade.Core.Logic.Validate
             return true;
         }
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
         public bool IsValidTransactionType(string transactionType)
         {
             if (!stringCheck.MaxLength(transactionType, 50))

src/bnhtrade.Core/Logic/Validate/Invoice.cs

@@ -6,27 +6,22 @@ using System.Threading.Tasks;
 
 namespace bnhtrade.Core.Logic.Validate
 {
-    public class SalesInvoice : Logic.Validate.Validate
+    public class Invoice : Logic.Validate.Validate
     {
-        public SalesInvoice()
+        public Invoice()
         {
         }
 
         public bool IsValidExportInvoice(IEnumerable<Model.Account.Invoice> invoiceList)
         {
-            if (!IsValid(invoiceList))
+            bool valid = IsValid(invoiceList);
+            if (valid == false)
             {
                 return false;
             }
 
             foreach (var invoice in invoiceList)
             {
-                if (invoice.UnitAmountIsTaxExclusive == false)
-                {
-                    ValidationResultAdd("Tax inclusive line unit amounts are not supported");
-                    return false;
-                }
-
                 foreach (var invoiceLine in invoice.InvoiceLineList)
                 {
                     if (invoiceLine.Quantity != 1)