99 lines
3.3 KiB
C#
99 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using AudibleUtilities;
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using DataLayer;
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using Dinah.Core;
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using Dinah.Core.Collections.Generic;
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namespace DtoImporterService
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{
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public class LibraryBookImporter : ItemsImporterBase
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{
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protected override IValidator Validator => new LibraryValidator();
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private BookImporter bookImporter { get; }
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public LibraryBookImporter(LibationContext context) : base(context)
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{
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bookImporter = new BookImporter(DbContext);
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}
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protected override int DoImport(IEnumerable<ImportItem> importItems)
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{
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bookImporter.Import(importItems);
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var qtyNew = upsertLibraryBooks(importItems);
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return qtyNew;
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}
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private int upsertLibraryBooks(IEnumerable<ImportItem> importItems)
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{
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// technically, we should be able to have duplicate books from separate accounts.
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// this would violate the current pk and would be difficult to deal with elsewhere:
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// - what to show in the grid
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// - which to consider liberated
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//
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// sqlite cannot alter pk. the work around is an extensive headache
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// - update: now possible in .net5/efcore5
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//
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// currently, inserting LibraryBook will throw error if the same book is in multiple accounts for the same region.
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//
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// CURRENT SOLUTION: don't re-insert
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var newItems = importItems
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.ExceptBy(DbContext.LibraryBooks.Select(lb => lb.Book.AudibleProductId), imp => imp.DtoItem.ProductId)
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.ToList();
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// if 2 accounts try to import the same book in the same transaction: error since we're only tracking and pulling by asin.
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// just use the first
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var hash = newItems.ToDictionarySafe(dto => dto.DtoItem.ProductId);
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foreach (var kvp in hash)
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{
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var newItem = kvp.Value;
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var libraryBook = new LibraryBook(
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bookImporter.Cache[newItem.DtoItem.ProductId],
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newItem.DtoItem.DateAdded,
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newItem.AccountId)
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{
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AbsentFromLastScan = isPlusTitleUnavailable(newItem)
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};
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try
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{
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DbContext.LibraryBooks.Add(libraryBook);
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}
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catch (Exception ex)
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{
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Serilog.Log.Logger.Error(ex, "Error adding library book. {@DebugInfo}", new { libraryBook.Book, libraryBook.Account });
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}
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}
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var scannedAccounts = importItems.Select(i => i.AccountId).Distinct().ToList();
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//If an existing Book wasn't found in the import, the owning LibraryBook's Book will be null.
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//Only change AbsentFromLastScan for LibraryBooks of accounts that were scanned.
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foreach (var nullBook in DbContext.LibraryBooks.AsEnumerable().Where(lb => lb.Book is null && lb.Account.In(scannedAccounts)))
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nullBook.AbsentFromLastScan = true;
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//Join importItems on LibraryBooks before iterating over LibraryBooks to avoid
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//quadratic complexity caused by searching all of importItems for each LibraryBook.
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//Join uses hashing, so complexity should approach O(N) instead of O(N^2).
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var items_lbs
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= importItems
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.Join(DbContext.LibraryBooks, o => (o.AccountId, o.DtoItem.ProductId), i => (i.Account, i.Book?.AudibleProductId), (o, i) => (o, i));
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foreach ((ImportItem item, LibraryBook lb) in items_lbs)
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lb.AbsentFromLastScan = isPlusTitleUnavailable(item);
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var qtyNew = hash.Count;
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return qtyNew;
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}
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private static bool isPlusTitleUnavailable(ImportItem item)
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=> item.DtoItem.IsAyce is true
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&& item.DtoItem.Plans?.Any(p => p.IsAyce) is not true;
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}
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}
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