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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.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.Music;
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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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Task<List<DownloadDecision>> AlbumSearch(int albumId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch);
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Task<List<DownloadDecision>> ArtistSearch(int artistId, 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 IAlbumService _albumService;
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private readonly IArtistService _artistService;
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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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IAlbumService albumService,
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IArtistService artistService,
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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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_albumService = albumService;
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_artistService = artistService;
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_makeDownloadDecision = makeDownloadDecision;
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_logger = logger;
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}
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public async Task<List<DownloadDecision>> AlbumSearch(int albumId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var album = _albumService.GetAlbum(albumId);
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return await AlbumSearch(album, missingOnly, userInvokedSearch, interactiveSearch);
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}
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public async Task<List<DownloadDecision>> ArtistSearch(int artistId, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var artist = _artistService.GetArtist(artistId);
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return await ArtistSearch(artist, missingOnly, userInvokedSearch, interactiveSearch);
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}
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public async Task<List<DownloadDecision>> ArtistSearch(Artist artist, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var downloadDecisions = new List<DownloadDecision>();
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var searchSpec = Get<ArtistSearchCriteria>(artist, userInvokedSearch, interactiveSearch);
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var albums = _albumService.GetAlbumsByArtist(artist.Id);
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albums = albums.Where(a => a.Monitored).ToList();
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searchSpec.Albums = albums;
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var decisions = await Dispatch(indexer => indexer.Fetch(searchSpec), searchSpec);
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downloadDecisions.AddRange(decisions);
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return DeDupeDecisions(downloadDecisions);
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}
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public async Task<List<DownloadDecision>> AlbumSearch(Album album, bool missingOnly, bool userInvokedSearch, bool interactiveSearch)
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{
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var downloadDecisions = new List<DownloadDecision>();
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var artist = _artistService.GetArtist(album.ArtistId);
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var searchSpec = Get<AlbumSearchCriteria>(artist, new List<Album> { album }, userInvokedSearch, interactiveSearch);
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searchSpec.AlbumTitle = album.Title;
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if (album.ReleaseDate.HasValue)
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{
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searchSpec.AlbumYear = album.ReleaseDate.Value.Year;
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}
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if (album.Disambiguation.IsNotNullOrWhiteSpace())
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{
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searchSpec.Disambiguation = album.Disambiguation;
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}
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var decisions = await Dispatch(indexer => indexer.Fetch(searchSpec), searchSpec);
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downloadDecisions.AddRange(decisions);
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return DeDupeDecisions(downloadDecisions);
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}
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private TSpec Get<TSpec>(Artist artist, List<Album> albums, 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.Albums = albums;
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spec.Artist = artist;
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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>(Artist artist, 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.Artist = artist;
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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 async Task<List<DownloadDecision>> Dispatch(Func<IIndexer, Task<IList<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.Artist.Tags).Any()).ToList();
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_logger.ProgressInfo("Searching indexers for {0}. {1} active indexers", criteriaBase, indexers.Count);
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var tasks = indexers.Select(indexer => DispatchIndexer(searchAction, indexer, criteriaBase));
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var batch = await Task.WhenAll(tasks);
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var reports = batch.SelectMany(x => x).ToList();
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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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private async Task<IList<ReleaseInfo>> DispatchIndexer(Func<IIndexer, Task<IList<ReleaseInfo>>> searchAction, IIndexer indexer, SearchCriteriaBase criteriaBase)
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{
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try
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{
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return await searchAction(indexer);
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}
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catch (Exception ex)
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{
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_logger.Error(ex, "Error while searching for {0}", criteriaBase);
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}
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return Array.Empty<ReleaseInfo>();
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}
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private List<DownloadDecision> DeDupeDecisions(List<DownloadDecision> decisions)
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{
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// De-dupe reports by guid so duplicate results aren't returned. Pick the one with the least rejections and higher indexer priority.
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return decisions.GroupBy(d => d.RemoteAlbum.Release.Guid)
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.Select(d => d.OrderBy(v => v.Rejections.Count()).ThenBy(v => v.RemoteAlbum?.Release?.IndexerPriority ?? IndexerDefinition.DefaultPriority).First())
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.ToList();
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}
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}
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}
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