Move source code into "Source" folder

Source/DtoImporterService/LibraryBookImporter.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using AudibleUtilities;
+using DataLayer;
+using Dinah.Core.Collections.Generic;
+
+namespace DtoImporterService
+{
+	public class LibraryBookImporter : ItemsImporterBase
+	{
+		protected override IValidator Validator => new LibraryValidator();
+
+		private BookImporter bookImporter { get; }
+
+		public LibraryBookImporter(LibationContext context) : base(context)
+		{
+			bookImporter = new BookImporter(DbContext);
+		}
+
+		protected override int DoImport(IEnumerable<ImportItem> importItems)
+		{
+			bookImporter.Import(importItems);
+
+			var qtyNew = upsertLibraryBooks(importItems);
+			return qtyNew;
+		}
+
+		private int upsertLibraryBooks(IEnumerable<ImportItem> importItems)
+		{
+			// technically, we should be able to have duplicate books from separate accounts.
+			// this would violate the current pk and would be difficult to deal with elsewhere:
+			// - what to show in the grid
+			// - which to consider liberated
+			//
+			// sqlite cannot alter pk. the work around is an extensive headache
+			// - update: now possible in .net5/efcore5
+			//
+			// currently, inserting LibraryBook will throw error if the same book is in multiple accounts for the same region.
+			//
+			// CURRENT SOLUTION: don't re-insert
+
+			var currentLibraryProductIds = DbContext.LibraryBooks.Select(l => l.Book.AudibleProductId).ToList();
+			var newItems = importItems
+				.Where(dto => !currentLibraryProductIds.Contains(dto.DtoItem.ProductId))
+				.ToList();
+
+			// if 2 accounts try to import the same book in the same transaction: error since we're only tracking and pulling by asin.
+			// just use the first
+			var hash = newItems.ToDictionarySafe(dto => dto.DtoItem.ProductId);
+			foreach (var kvp in hash)
+            {
+				var newItem = kvp.Value;
+
+				var libraryBook = new LibraryBook(
+					bookImporter.Cache[newItem.DtoItem.ProductId],
+					newItem.DtoItem.DateAdded,
+					newItem.AccountId);
+				try
+				{
+					DbContext.LibraryBooks.Add(libraryBook);
+				}
+				catch (Exception ex)
+				{
+					Serilog.Log.Logger.Error(ex, "Error adding library book. {@DebugInfo}", new { libraryBook.Book, libraryBook.Account });
+				}
+			}
+
+			var qtyNew = hash.Count;
+			return qtyNew;
+		}
+	}
+}