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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 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.Serializer;
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using NzbDrone.Core.IndexerSearch.Definitions;
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using NzbDrone.Core.Parser;
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using NzbDrone.Core.Parser.Model;
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namespace NzbDrone.Core.DecisionEngine
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{
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public interface IMakeDownloadDecision
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{
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List<DownloadDecision> GetRssDecision(List<ReleaseInfo> reports);
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List<DownloadDecision> GetSearchDecision(List<ReleaseInfo> reports, SearchCriteriaBase searchCriteriaBase);
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}
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public class DownloadDecisionMaker : IMakeDownloadDecision
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{
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private readonly IEnumerable<IDecisionEngineSpecification> _specifications;
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private readonly IParsingService _parsingService;
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private readonly Logger _logger;
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public DownloadDecisionMaker(IEnumerable<IDecisionEngineSpecification> specifications, IParsingService parsingService, Logger logger)
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{
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_specifications = specifications;
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_parsingService = parsingService;
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_logger = logger;
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}
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public List<DownloadDecision> GetRssDecision(List<ReleaseInfo> reports)
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{
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return GetAlbumDecisions(reports).ToList();
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}
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public List<DownloadDecision> GetSearchDecision(List<ReleaseInfo> reports, SearchCriteriaBase searchCriteriaBase)
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{
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return GetAlbumDecisions(reports, searchCriteriaBase).ToList();
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}
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private IEnumerable<DownloadDecision> GetAlbumDecisions(List<ReleaseInfo> reports, SearchCriteriaBase searchCriteria = null)
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{
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if (reports.Any())
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{
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_logger.ProgressInfo("Processing {0} releases", reports.Count);
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}
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else
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{
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_logger.ProgressInfo("No results found");
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}
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var reportNumber = 1;
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foreach (var report in reports)
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{
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DownloadDecision decision = null;
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_logger.ProgressTrace("Processing release {0}/{1}", reportNumber, reports.Count);
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try
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{
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var parsedAlbumInfo = Parser.Parser.ParseAlbumTitle(report.Title);
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if (parsedAlbumInfo != null && !parsedAlbumInfo.ArtistName.IsNullOrWhiteSpace())
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{
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var remoteAlbum = _parsingService.Map(parsedAlbumInfo, searchCriteria);
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remoteAlbum.Release = report;
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if (remoteAlbum.Artist == null)
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{
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decision = new DownloadDecision(remoteAlbum, new Rejection("Unknown Artist"));
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}
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else if (remoteAlbum.Albums.Empty())
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{
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decision = new DownloadDecision(remoteAlbum, new Rejection("Unable to parse albums from release name"));
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}
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else
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{
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remoteAlbum.DownloadAllowed = remoteAlbum.Albums.Any();
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decision = GetDecisionForReport(remoteAlbum, searchCriteria);
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}
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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, "Couldn't process release.");
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var remoteAlbum = new RemoteAlbum { Release = report };
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decision = new DownloadDecision(remoteAlbum, new Rejection("Unexpected error processing release"));
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}
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reportNumber++;
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if (decision != null)
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{
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if (decision.Rejections.Any())
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{
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_logger.Debug("Release rejected for the following reasons: {0}", string.Join(", ", decision.Rejections));
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}
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else
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{
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_logger.Debug("Release accepted");
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}
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yield return decision;
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}
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}
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}
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private DownloadDecision GetDecisionForReport(RemoteAlbum remoteAlbum, SearchCriteriaBase searchCriteria = null)
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{
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var reasons = _specifications.Select(c => EvaluateSpec(c, remoteAlbum, searchCriteria))
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.Where(c => c != null);
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return new DownloadDecision(remoteAlbum, reasons.ToArray());
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}
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private Rejection EvaluateSpec(IDecisionEngineSpecification spec, RemoteAlbum remoteAlbum, SearchCriteriaBase searchCriteriaBase = null)
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{
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try
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{
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var result = spec.IsSatisfiedBy(remoteAlbum, searchCriteriaBase);
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if (!result.Accepted)
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{
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return new Rejection(result.Reason, spec.Type);
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}
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}
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catch (NotImplementedException e)
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{
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_logger.Trace("Spec " + spec.GetType().Name + " not implemented.");
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}
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catch (Exception e)
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{
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e.Data.Add("report", remoteAlbum.Release.ToJson());
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e.Data.Add("parsed", remoteAlbum.ParsedAlbumInfo.ToJson());
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_logger.Error(e, "Couldn't evaluate decision on {0}", remoteAlbum.Release.Title);
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return new Rejection($"{spec.GetType().Name}: {e.Message}");
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}
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return null;
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}
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}
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}
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