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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using NLog;
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using NzbDrone.Common.Extensions;
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using NzbDrone.Common.Instrumentation.Extensions;
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using NzbDrone.Common.TPL;
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using NzbDrone.Core.Books;
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using NzbDrone.Core.DecisionEngine;
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using NzbDrone.Core.Indexers;
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using NzbDrone.Core.IndexerSearch.Definitions;
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using NzbDrone.Core.Parser.Model;
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namespace NzbDrone.Core.IndexerSearch
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{
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public interface ISearchForReleases
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{
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List<DownloadDecision> BookSearch(int bookId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch);
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List<DownloadDecision> AuthorSearch(int authorId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch);
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}
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public class ReleaseSearchService : ISearchForReleases
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{
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private readonly IIndexerFactory _indexerFactory;
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private readonly IBookService _bookService;
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private readonly IAuthorService _authorService;
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private readonly IMakeDownloadDecision _makeDownloadDecision;
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private readonly Logger _logger;
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public ReleaseSearchService(IIndexerFactory indexerFactory,
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IBookService bookService,
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IAuthorService authorService,
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IMakeDownloadDecision makeDownloadDecision,
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Logger logger)
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{
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_indexerFactory = indexerFactory;
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_bookService = bookService;
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_authorService = authorService;
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_makeDownloadDecision = makeDownloadDecision;
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_logger = logger;
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}
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public List<DownloadDecision> BookSearch(int bookId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var book = _bookService.GetBook(bookId);
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return BookSearch(book, missingOnly, userInvokedSearch, interactiveSearch);
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}
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public List<DownloadDecision> AuthorSearch(int authorId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var author = _authorService.GetAuthor(authorId);
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return AuthorSearch(author, missingOnly, userInvokedSearch, interactiveSearch);
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}
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public List<DownloadDecision> AuthorSearch(Author author, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var searchSpec = Get<AuthorSearchCriteria>(author, userInvokedSearch, interactiveSearch);
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var books = _bookService.GetBooksByAuthor(author.Id);
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books = books.Where(a => a.Monitored).ToList();
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searchSpec.Books = books;
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return Dispatch(indexer => indexer.Fetch(searchSpec), searchSpec);
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}
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public List<DownloadDecision> BookSearch(Book book, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var author = _authorService.GetAuthor(book.AuthorId);
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var searchSpec = Get<BookSearchCriteria>(author, new List<Book> { book }, userInvokedSearch, interactiveSearch);
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searchSpec.BookTitle = book.Editions.Value.SingleOrDefault(x => x.Monitored).Title;
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// searchSpec.BookIsbn = book.Isbn13;
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if (book.ReleaseDate.HasValue)
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{
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searchSpec.BookYear = book.ReleaseDate.Value.Year;
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}
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return Dispatch(indexer => indexer.Fetch(searchSpec), searchSpec);
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}
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private TSpec Get<TSpec>(Author author, List<Book> books, bool userInvokedSearch, bool interactiveSearch)
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where TSpec : SearchCriteriaBase, new()
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{
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var spec = new TSpec();
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spec.Books = books;
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spec.Author = author;
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spec.UserInvokedSearch = userInvokedSearch;
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spec.InteractiveSearch = interactiveSearch;
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return spec;
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}
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private static TSpec Get<TSpec>(Author author, bool userInvokedSearch, bool interactiveSearch)
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where TSpec : SearchCriteriaBase, new()
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{
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var spec = new TSpec();
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spec.Author = author;
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spec.UserInvokedSearch = userInvokedSearch;
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spec.InteractiveSearch = interactiveSearch;
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return spec;
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}
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private List<DownloadDecision> Dispatch(Func<IIndexer, IEnumerable<ReleaseInfo>> searchAction, SearchCriteriaBase criteriaBase)
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{
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var indexers = criteriaBase.InteractiveSearch ?
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_indexerFactory.InteractiveSearchEnabled() :
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_indexerFactory.AutomaticSearchEnabled();
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// Filter indexers to untagged indexers and indexers with intersecting tags
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indexers = indexers.Where(i => i.Definition.Tags.Empty() || i.Definition.Tags.Intersect(criteriaBase.Author.Tags).Any()).ToList();
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var reports = new List<ReleaseInfo>();
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_logger.ProgressInfo("Searching indexers for {0}. {1} active indexers", criteriaBase, indexers.Count);
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var taskList = new List<Task>();
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var taskFactory = new TaskFactory(TaskCreationOptions.LongRunning, TaskContinuationOptions.None);
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foreach (var indexer in indexers)
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{
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var indexerLocal = indexer;
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taskList.Add(taskFactory.StartNew(() =>
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{
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try
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{
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var indexerReports = searchAction(indexerLocal);
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lock (reports)
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{
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reports.AddRange(indexerReports);
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}
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}
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catch (Exception e)
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{
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_logger.Error(e, "Error while searching for {0}", criteriaBase);
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}
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}).LogExceptions());
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}
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Task.WaitAll(taskList.ToArray());
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_logger.Debug("Total of {0} reports were found for {1} from {2} indexers", reports.Count, criteriaBase, indexers.Count);
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return _makeDownloadDecision.GetSearchDecision(reports, criteriaBase).ToList();
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}
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}
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}
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