Radarr/src/NzbDrone.Core/Download/History/DownloadHistoryService.cs

using System;
using NzbDrone.Common.Extensions;
using NzbDrone.Core.History;
using NzbDrone.Core.MediaFiles.Events;
using NzbDrone.Core.Messaging.Events;
using NzbDrone.Core.Movies.Events;

namespace NzbDrone.Core.Download.History
{
    public interface IDownloadHistoryService
    {
        bool DownloadAlreadyImported(string downloadId);
        DownloadHistory GetLatestDownloadHistoryItem(string downloadId);
    }

    public class DownloadHistoryService : IDownloadHistoryService,
                                          IHandle<MovieGrabbedEvent>,
                                          IHandle<MovieImportedEvent>,
                                          IHandle<DownloadCompletedEvent>,
                                          IHandle<DownloadFailedEvent>,
                                          IHandle<DownloadIgnoredEvent>,
                                          IHandle<MovieDeletedEvent>
    {
        private readonly IDownloadHistoryRepository _repository;
        private readonly IHistoryService _historyService;

        public DownloadHistoryService(IDownloadHistoryRepository repository, IHistoryService historyService)
        {
            _repository = repository;
            _historyService = historyService;
        }

        public bool DownloadAlreadyImported(string downloadId)
        {
            var events = _repository.FindByDownloadId(downloadId);

            // Events are ordered by date descending, if a grabbed event comes before an imported event then it was never imported
            // or grabbed again after importing and should be reprocessed.
            foreach (var e in events)
            {
                if (e.EventType == DownloadHistoryEventType.DownloadGrabbed)
                {
                    return false;
                }

                if (e.EventType == DownloadHistoryEventType.DownloadImported)
                {
                    return true;
                }
            }

            return false;
        }

        public DownloadHistory GetLatestDownloadHistoryItem(string downloadId)
        {
            var events = _repository.FindByDownloadId(downloadId);

            // Events are ordered by date descending. We'll return the most recent expected event.
            foreach (var e in events)
            {
                if (e.EventType == DownloadHistoryEventType.DownloadGrabbed)
                {
                    return e;
                }

                if (e.EventType == DownloadHistoryEventType.DownloadImported)
                {
                    return e;
                }

                if (e.EventType == DownloadHistoryEventType.DownloadFailed)
                {
                    return e;
                }
            }

            return null;
        }

        public void Handle(MovieGrabbedEvent message)
        {
            var history = new DownloadHistory
            {
                EventType = DownloadHistoryEventType.DownloadGrabbed,
                MovieId = message.Movie.Movie.Id,
                DownloadId = message.DownloadId,
                SourceTitle = message.Movie.Release.Title,
                Date = DateTime.UtcNow,
                Protocol = message.Movie.Release.DownloadProtocol,
                IndexerId = message.Movie.Release.IndexerId,
                DownloadClientId = message.DownloadClientId,
                Release = message.Movie.Release
            };

            history.Data.Add("Indexer", message.Movie.Release.Indexer);
            history.Data.Add("DownloadClient", message.DownloadClient);
            history.Data.Add("DownloadClientName", message.DownloadClientName);

            history.Data.Add("CustomFormatScore", message.Movie.CustomFormatScore.ToString());
            _repository.Insert(history);
        }

        public void Handle(MovieImportedEvent message)
        {
            if (!message.NewDownload)
            {
                return;
            }

            var downloadId = message.DownloadId;

            // Try to find the downloadId if the user used manual import (from wanted: missing) or the
            // API to import and downloadId wasn't provided.
            if (downloadId.IsNullOrWhiteSpace())
            {
                downloadId = _historyService.FindDownloadId(message);
            }

            if (downloadId.IsNullOrWhiteSpace())
            {
                return;
            }

            var history = new DownloadHistory
            {
                EventType = DownloadHistoryEventType.FileImported,
                MovieId = message.MovieInfo.Movie.Id,
                DownloadId = downloadId,
                SourceTitle = message.MovieInfo.Path,
                Date = DateTime.UtcNow,
                Protocol = message.DownloadClientInfo.Protocol,
                DownloadClientId = message.DownloadClientInfo.Id
            };

            history.Data.Add("DownloadClient", message.DownloadClientInfo.Type);
            history.Data.Add("DownloadClientName", message.DownloadClientInfo.Name);

            _repository.Insert(history);
        }

        public void Handle(DownloadCompletedEvent message)
        {
            var history = new DownloadHistory
            {
                EventType = DownloadHistoryEventType.DownloadImported,
                MovieId = message.TrackedDownload.RemoteMovie.Movie.Id,
                DownloadId = message.TrackedDownload.DownloadItem.DownloadId,
                SourceTitle = message.TrackedDownload.DownloadItem.OutputPath.ToString(),
                Date = DateTime.UtcNow,
                Protocol = message.TrackedDownload.Protocol,
                DownloadClientId = message.TrackedDownload.DownloadClient
            };

            history.Data.Add("DownloadClient", message.TrackedDownload.DownloadItem.DownloadClientInfo.Type);
            history.Data.Add("DownloadClientName", message.TrackedDownload.DownloadItem.DownloadClientInfo.Name);

            _repository.Insert(history);
        }

        public void Handle(DownloadFailedEvent message)
        {
            // Don't track failed download for an unknown download
            if (message.TrackedDownload == null)
            {
                return;
            }

            var history = new DownloadHistory
            {
                EventType = DownloadHistoryEventType.DownloadFailed,
                MovieId = message.MovieId,
                DownloadId = message.DownloadId,
                SourceTitle = message.SourceTitle,
                Date = DateTime.UtcNow,
                Protocol = message.TrackedDownload.Protocol,
                DownloadClientId = message.TrackedDownload.DownloadClient
            };

            history.Data.Add("DownloadClient", message.TrackedDownload.DownloadItem.DownloadClientInfo.Type);
            history.Data.Add("DownloadClientName", message.TrackedDownload.DownloadItem.DownloadClientInfo.Name);

            _repository.Insert(history);
        }

        public void Handle(DownloadIgnoredEvent message)
        {
            var history = new DownloadHistory
            {
                EventType = DownloadHistoryEventType.DownloadIgnored,
                MovieId = message.MovieId,
                DownloadId = message.DownloadId,
                SourceTitle = message.SourceTitle,
                Date = DateTime.UtcNow,
                Protocol = message.DownloadClientInfo.Protocol,
                DownloadClientId = message.DownloadClientInfo.Id
            };

            history.Data.Add("DownloadClient", message.DownloadClientInfo.Type);
            history.Data.Add("DownloadClientName", message.DownloadClientInfo.Name);

            _repository.Insert(history);
        }

        public void Handle(MovieDeletedEvent message)
        {
            _repository.DeleteByMovieId(message.Movie.Id);
        }
    }
}