Readarr/src/Lidarr.Api.V1/Artist/ArtistModule.cs

using System;
using System.Collections.Generic;
using System.Linq;
using FluentValidation;
using NzbDrone.Common.Extensions;
using NzbDrone.Core.Datastore.Events;
using NzbDrone.Core.MediaCover;
using NzbDrone.Core.MediaFiles;
using NzbDrone.Core.MediaFiles.Events;
using NzbDrone.Core.Messaging.Commands;
using NzbDrone.Core.Messaging.Events;
using NzbDrone.Core.ArtistStats;
using NzbDrone.Core.Music;
using NzbDrone.Core.Music.Commands;
using NzbDrone.Core.Music.Events;
using NzbDrone.Core.Validation;
using NzbDrone.Core.Validation.Paths;
using Lidarr.Api.V1.Albums;
using NzbDrone.SignalR;
using Lidarr.Http;
using Lidarr.Http.Extensions;
using Lidarr.Http.Mapping;

namespace Lidarr.Api.V1.Artist
{
    public class ArtistModule : LidarrRestModuleWithSignalR<ArtistResource, NzbDrone.Core.Music.Artist>, 
                                IHandle<TrackImportedEvent>, 
                                IHandle<TrackFileDeletedEvent>,
                                IHandle<ArtistUpdatedEvent>,       
                                IHandle<ArtistEditedEvent>,  
                                IHandle<ArtistDeletedEvent>,
                                IHandle<ArtistRenamedEvent>,
                                IHandle<MediaCoversUpdatedEvent>

    {
        private readonly IArtistService _artistService;
        private readonly IAlbumService _albumService;
        private readonly IAddArtistService _addArtistService;
        private readonly IArtistStatisticsService _artistStatisticsService;
        private readonly IMapCoversToLocal _coverMapper;
        private readonly IManageCommandQueue _commandQueueManager;

        public ArtistModule(IBroadcastSignalRMessage signalRBroadcaster,
                            IArtistService artistService,
                            IAlbumService albumService,
                            IAddArtistService addArtistService,
                            IArtistStatisticsService artistStatisticsService,
                            IMapCoversToLocal coverMapper,
                            IManageCommandQueue commandQueueManager,
                            RootFolderValidator rootFolderValidator,
                            ArtistPathValidator artistPathValidator,
                            ArtistExistsValidator artistExistsValidator,
                            ArtistAncestorValidator artistAncestorValidator,
                            SystemFolderValidator systemFolderValidator,
                            ProfileExistsValidator profileExistsValidator,
                            LanguageProfileExistsValidator languageProfileExistsValidator,
                            MetadataProfileExistsValidator metadataProfileExistsValidator
            )
            : base(signalRBroadcaster)
        {
            _artistService = artistService;
            _albumService = albumService;
            _addArtistService = addArtistService;
            _artistStatisticsService = artistStatisticsService;

            _coverMapper = coverMapper;
            _commandQueueManager = commandQueueManager;

            GetResourceAll = AllArtists;
            GetResourceById = GetArtist;
            CreateResource = AddArtist;
            UpdateResource = UpdateArtist;
            DeleteResource = DeleteArtist;

            Http.Validation.RuleBuilderExtensions.ValidId(SharedValidator.RuleFor(s => s.QualityProfileId));

            SharedValidator.RuleFor(s => s.Path)
                           .Cascade(CascadeMode.StopOnFirstFailure)
                           .IsValidPath()
                           .SetValidator(rootFolderValidator)
                           .SetValidator(artistPathValidator)
                           .SetValidator(artistAncestorValidator)
                           .SetValidator(systemFolderValidator)
                           .When(s => !s.Path.IsNullOrWhiteSpace());

            SharedValidator.RuleFor(s => s.QualityProfileId).SetValidator(profileExistsValidator);
            SharedValidator.RuleFor(s => s.LanguageProfileId).SetValidator(languageProfileExistsValidator);
            SharedValidator.RuleFor(s => s.MetadataProfileId).SetValidator(metadataProfileExistsValidator);

            PostValidator.RuleFor(s => s.Path).IsValidPath().When(s => s.RootFolderPath.IsNullOrWhiteSpace());
            PostValidator.RuleFor(s => s.RootFolderPath).IsValidPath().When(s => s.Path.IsNullOrWhiteSpace());
            PostValidator.RuleFor(s => s.ArtistName).NotEmpty();
            PostValidator.RuleFor(s => s.ForeignArtistId).NotEmpty().SetValidator(artistExistsValidator);

            PutValidator.RuleFor(s => s.Path).IsValidPath();
        }

        private ArtistResource GetArtist(int id)
        {
            var artist = _artistService.GetArtist(id);
            return GetArtistResource(artist);
        }

        private ArtistResource GetArtistResource(NzbDrone.Core.Music.Artist artist)
        {
            if (artist == null) return null;

            var resource = artist.ToResource();
            MapCoversToLocal(resource);
            FetchAndLinkArtistStatistics(resource);
            LinkNextPreviousAlbums(resource);
            //PopulateAlternateTitles(resource);

            return resource;
        }

        private List<ArtistResource> AllArtists()
        {
            var artistStats = _artistStatisticsService.ArtistStatistics();
            var artistsResources = _artistService.GetAllArtists().ToResource();

            MapCoversToLocal(artistsResources.ToArray());
            LinkNextPreviousAlbums(artistsResources.ToArray());
            LinkArtistStatistics(artistsResources, artistStats);
            //PopulateAlternateTitles(seriesResources);

            return artistsResources;
        }

        private int AddArtist(ArtistResource artistResource)
        {
            var artist = _addArtistService.AddArtist(artistResource.ToModel());

            return artist.Id;
        }

        private void UpdateArtist(ArtistResource artistResource)
        {
            var moveFiles = Request.GetBooleanQueryParameter("moveFiles");
            var artist = _artistService.GetArtist(artistResource.Id);

            if (moveFiles)
            {
                var sourcePath = artist.Path;
                var destinationPath = artistResource.Path;

                _commandQueueManager.Push(new MoveArtistCommand
                {
                    ArtistId = artist.Id,
                    SourcePath = sourcePath,
                    DestinationPath = destinationPath,
                    Trigger = CommandTrigger.Manual
                });
            }

            var model = artistResource.ToModel(artist);

            _artistService.UpdateArtist(model);

            BroadcastResourceChange(ModelAction.Updated, artistResource);
        }

        private void DeleteArtist(int id)
        {
            var deleteFiles = Request.GetBooleanQueryParameter("deleteFiles");

            _artistService.DeleteArtist(id, deleteFiles);
        }

        private void MapCoversToLocal(params ArtistResource[] artists)
        {
            foreach (var artistResource in artists)
            {
                _coverMapper.ConvertToLocalUrls(artistResource.Id, artistResource.Images);
            }
        }

        private void LinkNextPreviousAlbums(params ArtistResource[] artists)
        {
            foreach (var artistResource in artists)
            {
                var artistAlbums = _albumService.GetAlbumsByArtist(artistResource.Id).OrderBy(s=>s.ReleaseDate);
                artistResource.NextAlbum = artistAlbums.Where(s => s.ReleaseDate >= DateTime.UtcNow && s.Monitored).FirstOrDefault();
                artistResource.LastAlbum = artistAlbums.Where(s => s.ReleaseDate <= DateTime.UtcNow && s.Monitored).LastOrDefault();
            }
        }

        private void FetchAndLinkArtistStatistics(ArtistResource resource)
        {
            LinkArtistStatistics(resource, _artistStatisticsService.ArtistStatistics(resource.Id));
        }

        private void LinkArtistStatistics(List<ArtistResource> resources, List<ArtistStatistics> artistStatistics)
        {
            foreach (var artist in resources)
            {
                var stats = artistStatistics.SingleOrDefault(ss => ss.ArtistId == artist.Id);
                if (stats == null) continue;

                LinkArtistStatistics(artist, stats);
            }
        }

        private void LinkArtistStatistics(ArtistResource resource, ArtistStatistics artistStatistics)
        {
            resource.TotalTrackCount = artistStatistics.TotalTrackCount;
            resource.TrackCount = artistStatistics.TrackCount;
            resource.TrackFileCount = artistStatistics.TrackFileCount;
            resource.SizeOnDisk = artistStatistics.SizeOnDisk;
            resource.AlbumCount = artistStatistics.AlbumCount;

        }

        //private void PopulateAlternateTitles(List<ArtistResource> resources)
        //{
        //    foreach (var resource in resources)
        //    {
        //        PopulateAlternateTitles(resource);
        //    }
        //}

        //private void PopulateAlternateTitles(ArtistResource resource)
        //{
        //    var mappings = _sceneMappingService.FindByTvdbId(resource.TvdbId);

        //    if (mappings == null) return;

        //    resource.AlternateTitles = mappings.Select(v => new AlternateTitleResource { Title = v.Title, SeasonNumber = v.SeasonNumber, SceneSeasonNumber = v.SceneSeasonNumber }).ToList();
        //}

        public void Handle(TrackImportedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, message.ImportedTrack.ArtistId);
        }

        public void Handle(TrackFileDeletedEvent message)
        {
            if (message.Reason == DeleteMediaFileReason.Upgrade) return;

            BroadcastResourceChange(ModelAction.Updated, message.TrackFile.ArtistId);
        }

        public void Handle(ArtistUpdatedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, message.Artist.Id);
        }

        public void Handle(ArtistEditedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, message.Artist.Id);
        }

        public void Handle(ArtistDeletedEvent message)
        {
            BroadcastResourceChange(ModelAction.Deleted, message.Artist.ToResource());
        }

        public void Handle(ArtistRenamedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, message.Artist.Id);
        }

        public void Handle(MediaCoversUpdatedEvent message)
        {
            BroadcastResourceChange(ModelAction.Updated, message.Artist.Id);
        }
    }
}