jellyfin/Emby.Dlna/ContentDirectory/ControlHandler.cs

#pragma warning disable CS1591

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Xml;
using Emby.Dlna.Didl;
using Emby.Dlna.Service;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Entities.Movies;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Controller.Playlists;
using MediaBrowser.Controller.TV;
using MediaBrowser.Model.Dlna;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.Querying;
using Microsoft.Extensions.Logging;

namespace Emby.Dlna.ContentDirectory
{
    public class ControlHandler : BaseControlHandler
    {
        private readonly ILibraryManager _libraryManager;
        private readonly IUserDataManager _userDataManager;
        private readonly IServerConfigurationManager _config;
        private readonly User _user;
        private readonly IUserViewManager _userViewManager;
        private readonly ITVSeriesManager _tvSeriesManager;

        private const string NS_DC = "http://purl.org/dc/elements/1.1/";
        private const string NS_DIDL = "urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/";
        private const string NS_DLNA = "urn:schemas-dlna-org:metadata-1-0/";
        private const string NS_UPNP = "urn:schemas-upnp-org:metadata-1-0/upnp/";

        private readonly int _systemUpdateId;

        private readonly DidlBuilder _didlBuilder;

        private readonly DeviceProfile _profile;

        public ControlHandler(
            ILogger logger,
            ILibraryManager libraryManager,
            DeviceProfile profile,
            string serverAddress,
            string accessToken,
            IImageProcessor imageProcessor,
            IUserDataManager userDataManager,
            User user,
            int systemUpdateId,
            IServerConfigurationManager config,
            ILocalizationManager localization,
            IMediaSourceManager mediaSourceManager,
            IUserViewManager userViewManager,
            IMediaEncoder mediaEncoder,
            ITVSeriesManager tvSeriesManager)
            : base(config, logger)
        {
            _libraryManager = libraryManager;
            _userDataManager = userDataManager;
            _user = user;
            _systemUpdateId = systemUpdateId;
            _userViewManager = userViewManager;
            _tvSeriesManager = tvSeriesManager;
            _profile = profile;
            _config = config;

            _didlBuilder = new DidlBuilder(
                profile,
                user,
                imageProcessor,
                serverAddress,
                accessToken,
                userDataManager,
                localization,
                mediaSourceManager,
                Logger,
                mediaEncoder,
                libraryManager);
        }

        /// <inheritdoc />
        protected override void WriteResult(string methodName, IDictionary<string, string> methodParams, XmlWriter xmlWriter)
        {
            const string DeviceId = "test";

            if (string.Equals(methodName, "GetSearchCapabilities", StringComparison.OrdinalIgnoreCase))
            {
                HandleGetSearchCapabilities(xmlWriter);
                return;
            }

            if (string.Equals(methodName, "GetSortCapabilities", StringComparison.OrdinalIgnoreCase))
            {
                HandleGetSortCapabilities(xmlWriter);
                return;
            }

            if (string.Equals(methodName, "GetSortExtensionCapabilities", StringComparison.OrdinalIgnoreCase))
            {
                HandleGetSortExtensionCapabilities(xmlWriter);
                return;
            }

            if (string.Equals(methodName, "GetSystemUpdateID", StringComparison.OrdinalIgnoreCase))
            {
                HandleGetSystemUpdateID(xmlWriter);
                return;
            }

            if (string.Equals(methodName, "Browse", StringComparison.OrdinalIgnoreCase))
            {
                HandleBrowse(xmlWriter, methodParams, DeviceId);
                return;
            }

            if (string.Equals(methodName, "X_GetFeatureList", StringComparison.OrdinalIgnoreCase))
            {
                HandleXGetFeatureList(xmlWriter);
                return;
            }

            if (string.Equals(methodName, "GetFeatureList", StringComparison.OrdinalIgnoreCase))
            {
                HandleGetFeatureList(xmlWriter);
                return;
            }

            if (string.Equals(methodName, "X_SetBookmark", StringComparison.OrdinalIgnoreCase))
            {
                HandleXSetBookmark(methodParams);
                return;
            }

            if (string.Equals(methodName, "Search", StringComparison.OrdinalIgnoreCase))
            {
                HandleSearch(xmlWriter, methodParams, DeviceId);
                return;
            }

            if (string.Equals(methodName, "X_BrowseByLetter", StringComparison.OrdinalIgnoreCase))
            {
                HandleXBrowseByLetter(xmlWriter, methodParams, DeviceId);
                return;
            }

            throw new ResourceNotFoundException("Unexpected control request name: " + methodName);
        }

        private void HandleXSetBookmark(IDictionary<string, string> sparams)
        {
            var id = sparams["ObjectID"];

            var serverItem = GetItemFromObjectId(id);

            var item = serverItem.Item;

            var newbookmark = int.Parse(sparams["PosSecond"], CultureInfo.InvariantCulture);

            var userdata = _userDataManager.GetUserData(_user, item);

            userdata.PlaybackPositionTicks = TimeSpan.FromSeconds(newbookmark).Ticks;

            _userDataManager.SaveUserData(_user, item, userdata, UserDataSaveReason.TogglePlayed,
                CancellationToken.None);
        }

        private void HandleGetSearchCapabilities(XmlWriter xmlWriter)
        {
            xmlWriter.WriteElementString(
                "SearchCaps",
                "res@resolution,res@size,res@duration,dc:title,dc:creator,upnp:actor,upnp:artist,upnp:genre,upnp:album,dc:date,upnp:class,@id,@refID,@protocolInfo,upnp:author,dc:description,pv:avKeywords");
        }

        private void HandleGetSortCapabilities(XmlWriter xmlWriter)
        {
            xmlWriter.WriteElementString(
                "SortCaps",
                "res@duration,res@size,res@bitrate,dc:date,dc:title,dc:size,upnp:album,upnp:artist,upnp:albumArtist,upnp:episodeNumber,upnp:genre,upnp:originalTrackNumber,upnp:rating");
        }

        private void HandleGetSortExtensionCapabilities(XmlWriter xmlWriter)
        {
            xmlWriter.WriteElementString(
                "SortExtensionCaps",
                "res@duration,res@size,res@bitrate,dc:date,dc:title,dc:size,upnp:album,upnp:artist,upnp:albumArtist,upnp:episodeNumber,upnp:genre,upnp:originalTrackNumber,upnp:rating");
        }

        private void HandleGetSystemUpdateID(XmlWriter xmlWriter)
        {
            xmlWriter.WriteElementString("Id", _systemUpdateId.ToString(CultureInfo.InvariantCulture));
        }

        private void HandleGetFeatureList(XmlWriter xmlWriter)
        {
            xmlWriter.WriteElementString("FeatureList", WriteFeatureListXml());
        }

        private void HandleXGetFeatureList(XmlWriter xmlWriter)
            => HandleGetFeatureList(xmlWriter);

        private string WriteFeatureListXml()
        {
            // TODO: clean this up
            var builder = new StringBuilder();

            builder.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            builder.Append("<Features xmlns=\"urn:schemas-upnp-org:av:avs\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"urn:schemas-upnp-org:av:avs http://www.upnp.org/schemas/av/avs.xsd\">");

            builder.Append("<Feature name=\"samsung.com_BASICVIEW\" version=\"1\">");
            builder.Append("<container id=\"I\" type=\"object.item.imageItem\"/>");
            builder.Append("<container id=\"A\" type=\"object.item.audioItem\"/>");
            builder.Append("<container id=\"V\" type=\"object.item.videoItem\"/>");
            builder.Append("</Feature>");

            builder.Append("</Features>");

            return builder.ToString();
        }

        public string GetValueOrDefault(IDictionary<string, string> sparams, string key, string defaultValue)
        {
            if (sparams.TryGetValue(key, out string val))
            {
                return val;
            }

            return defaultValue;
        }

        private void HandleBrowse(XmlWriter xmlWriter, IDictionary<string, string> sparams, string deviceId)
        {
            var id = sparams["ObjectID"];
            var flag = sparams["BrowseFlag"];
            var filter = new Filter(GetValueOrDefault(sparams, "Filter", "*"));
            var sortCriteria = new SortCriteria(GetValueOrDefault(sparams, "SortCriteria", ""));

            var provided = 0;

            // Default to null instead of 0
            // Upnp inspector sends 0 as requestedCount when it wants everything
            int? requestedCount = null;
            int? start = 0;

            if (sparams.ContainsKey("RequestedCount") && int.TryParse(sparams["RequestedCount"], out var requestedVal) && requestedVal > 0)
            {
                requestedCount = requestedVal;
            }

            if (sparams.ContainsKey("StartingIndex") && int.TryParse(sparams["StartingIndex"], out var startVal) && startVal > 0)
            {
                start = startVal;
            }

            int totalCount;

            using (StringWriter builder = new StringWriterWithEncoding(Encoding.UTF8))
            {
                var settings = new XmlWriterSettings()
                {
                    Encoding = Encoding.UTF8,
                    CloseOutput = false,
                    OmitXmlDeclaration = true,
                    ConformanceLevel = ConformanceLevel.Fragment
                };

                using (var writer = XmlWriter.Create(builder, settings))
                {
                    writer.WriteStartElement(string.Empty, "DIDL-Lite", NS_DIDL);

                    writer.WriteAttributeString("xmlns", "dc", null, NS_DC);
                    writer.WriteAttributeString("xmlns", "dlna", null, NS_DLNA);
                    writer.WriteAttributeString("xmlns", "upnp", null, NS_UPNP);

                    DidlBuilder.WriteXmlRootAttributes(_profile, writer);

                    var serverItem = GetItemFromObjectId(id);
                    var item = serverItem.Item;


                    if (string.Equals(flag, "BrowseMetadata", StringComparison.Ordinal))
                    {
                        totalCount = 1;

                        if (item.IsDisplayedAsFolder || serverItem.StubType.HasValue)
                        {
                            var childrenResult = GetUserItems(item, serverItem.StubType, _user, sortCriteria, start, requestedCount);

                            _didlBuilder.WriteFolderElement(writer, item, serverItem.StubType, null, childrenResult.TotalRecordCount, filter, id);
                        }
                        else
                        {
                            var dlnaOptions = _config.GetDlnaConfiguration();
                            _didlBuilder.WriteItemElement(writer, item, _user, null, null, deviceId, filter);
                        }

                        provided++;
                    }
                    else
                    {
                        var childrenResult = GetUserItems(item, serverItem.StubType, _user, sortCriteria, start, requestedCount);
                        totalCount = childrenResult.TotalRecordCount;

                        provided = childrenResult.Items.Count;

                        var dlnaOptions = _config.GetDlnaConfiguration();
                        foreach (var i in childrenResult.Items)
                        {
                            var childItem = i.Item;
                            var displayStubType = i.StubType;

                            if (childItem.IsDisplayedAsFolder || displayStubType.HasValue)
                            {
                                var childCount = GetUserItems(childItem, displayStubType, _user, sortCriteria, null, 0)
                                    .TotalRecordCount;

                                _didlBuilder.WriteFolderElement(writer, childItem, displayStubType, item, childCount, filter);
                            }
                            else
                            {
                                _didlBuilder.WriteItemElement(writer, childItem, _user, item, serverItem.StubType, deviceId, filter);
                            }
                        }
                    }

                    writer.WriteFullEndElement();
                }

                xmlWriter.WriteElementString("Result", builder.ToString());
            }

            xmlWriter.WriteElementString("NumberReturned", provided.ToString(CultureInfo.InvariantCulture));
            xmlWriter.WriteElementString("TotalMatches", totalCount.ToString(CultureInfo.InvariantCulture));
            xmlWriter.WriteElementString("UpdateID", _systemUpdateId.ToString(CultureInfo.InvariantCulture));
        }

        private void HandleXBrowseByLetter(XmlWriter xmlWriter, IDictionary<string, string> sparams, string deviceId)
        {
            // TODO: Implement this method
            HandleSearch(xmlWriter, sparams, deviceId);
        }

        private void HandleSearch(XmlWriter xmlWriter, IDictionary<string, string> sparams, string deviceId)
        {
            var searchCriteria = new SearchCriteria(GetValueOrDefault(sparams, "SearchCriteria", ""));
            var sortCriteria = new SortCriteria(GetValueOrDefault(sparams, "SortCriteria", ""));
            var filter = new Filter(GetValueOrDefault(sparams, "Filter", "*"));

            // sort example: dc:title, dc:date

            // Default to null instead of 0
            // Upnp inspector sends 0 as requestedCount when it wants everything
            int? requestedCount = null;
            int? start = 0;

            if (sparams.ContainsKey("RequestedCount") && int.TryParse(sparams["RequestedCount"], out var requestedVal) && requestedVal > 0)
            {
                requestedCount = requestedVal;
            }

            if (sparams.ContainsKey("StartingIndex") && int.TryParse(sparams["StartingIndex"], out var startVal) && startVal > 0)
            {
                start = startVal;
            }

            QueryResult<BaseItem> childrenResult;

            using (StringWriter builder = new StringWriterWithEncoding(Encoding.UTF8))
            {
                var settings = new XmlWriterSettings()
                {
                    Encoding = Encoding.UTF8,
                    CloseOutput = false,
                    OmitXmlDeclaration = true,
                    ConformanceLevel = ConformanceLevel.Fragment
                };

                using (var writer = XmlWriter.Create(builder, settings))
                {
                    writer.WriteStartElement(string.Empty, "DIDL-Lite", NS_DIDL);

                    writer.WriteAttributeString("xmlns", "dc", null, NS_DC);
                    writer.WriteAttributeString("xmlns", "dlna", null, NS_DLNA);
                    writer.WriteAttributeString("xmlns", "upnp", null, NS_UPNP);

                    DidlBuilder.WriteXmlRootAttributes(_profile, writer);

                    var serverItem = GetItemFromObjectId(sparams["ContainerID"]);

                    var item = serverItem.Item;

                    childrenResult = GetChildrenSorted(item, _user, searchCriteria, sortCriteria, start, requestedCount);

                    var dlnaOptions = _config.GetDlnaConfiguration();

                    foreach (var i in childrenResult.Items)
                    {
                        if (i.IsDisplayedAsFolder)
                        {
                            var childCount = GetChildrenSorted(i, _user, searchCriteria, sortCriteria, null, 0)
                                .TotalRecordCount;

                            _didlBuilder.WriteFolderElement(writer, i, null, item, childCount, filter);
                        }
                        else
                        {
                            _didlBuilder.WriteItemElement(writer, i, _user, item, serverItem.StubType, deviceId, filter);
                        }
                    }

                    writer.WriteFullEndElement();
                }

                xmlWriter.WriteElementString("Result", builder.ToString());
            }

            xmlWriter.WriteElementString("NumberReturned", childrenResult.Items.Count.ToString(CultureInfo.InvariantCulture));
            xmlWriter.WriteElementString("TotalMatches", childrenResult.TotalRecordCount.ToString(CultureInfo.InvariantCulture));
            xmlWriter.WriteElementString("UpdateID", _systemUpdateId.ToString(CultureInfo.InvariantCulture));
        }

        private QueryResult<BaseItem> GetChildrenSorted(BaseItem item, User user, SearchCriteria search, SortCriteria sort, int? startIndex, int? limit)
        {
            var folder = (Folder)item;

            var sortOrders = folder.IsPreSorted
                ? Array.Empty<(string, SortOrder)>()
                : new[] { (ItemSortBy.SortName, sort.SortOrder) };

            string[] mediaTypes = Array.Empty<string>();
            bool? isFolder = null;

            if (search.SearchType == SearchType.Audio)
            {
                mediaTypes = new[] { MediaType.Audio };
                isFolder = false;
            }
            else if (search.SearchType == SearchType.Video)
            {
                mediaTypes = new[] { MediaType.Video };
                isFolder = false;
            }
            else if (search.SearchType == SearchType.Image)
            {
                mediaTypes = new[] { MediaType.Photo };
                isFolder = false;
            }
            else if (search.SearchType == SearchType.Playlist)
            {
                //items = items.OfType<Playlist>();
                isFolder = true;
            }
            else if (search.SearchType == SearchType.MusicAlbum)
            {
                //items = items.OfType<MusicAlbum>();
                isFolder = true;
            }

            return folder.GetItems(new InternalItemsQuery
            {
                Limit = limit,
                StartIndex = startIndex,
                OrderBy = sortOrders,
                User = user,
                Recursive = true,
                IsMissing = false,
                ExcludeItemTypes = new[] { typeof(Book).Name },
                IsFolder = isFolder,
                MediaTypes = mediaTypes,
                DtoOptions = GetDtoOptions()
            });
        }

        private DtoOptions GetDtoOptions()
        {
            return new DtoOptions(true);
        }

        private QueryResult<ServerItem> GetUserItems(BaseItem item, StubType? stubType, User user, SortCriteria sort, int? startIndex, int? limit)
        {
            if (item is MusicGenre)
            {
                return GetMusicGenreItems(item, Guid.Empty, user, sort, startIndex, limit);
            }

            if (item is MusicArtist)
            {
                return GetMusicArtistItems(item, Guid.Empty, user, sort, startIndex, limit);
            }

            if (item is Genre)
            {
                return GetGenreItems(item, Guid.Empty, user, sort, startIndex, limit);
            }

            if ((!stubType.HasValue || stubType.Value != StubType.Folder)
                && item is IHasCollectionType collectionFolder)
            {
                if (string.Equals(CollectionType.Music, collectionFolder.CollectionType, StringComparison.OrdinalIgnoreCase))
                {
                    return GetMusicFolders(item, user, stubType, sort, startIndex, limit);
                }
                else if (string.Equals(CollectionType.Movies, collectionFolder.CollectionType, StringComparison.OrdinalIgnoreCase))
                {
                    return GetMovieFolders(item, user, stubType, sort, startIndex, limit);
                }
                else if (string.Equals(CollectionType.TvShows, collectionFolder.CollectionType, StringComparison.OrdinalIgnoreCase))
                {
                    return GetTvFolders(item, user, stubType, sort, startIndex, limit);
                }
                else if (string.Equals(CollectionType.Folders, collectionFolder.CollectionType, StringComparison.OrdinalIgnoreCase))
                {
                    return GetFolders(user, startIndex, limit);
                }
                else if (string.Equals(CollectionType.LiveTv, collectionFolder.CollectionType, StringComparison.OrdinalIgnoreCase))
                {
                    return GetLiveTvChannels(user, sort, startIndex, limit);
                }
            }

            if (stubType.HasValue)
            {
                if (stubType.Value != StubType.Folder)
                {
                    return ApplyPaging(new QueryResult<ServerItem>(), startIndex, limit);
                }
            }

            var folder = (Folder)item;

            var query = new InternalItemsQuery(user)
            {
                Limit = limit,
                StartIndex = startIndex,
                IsVirtualItem = false,
                ExcludeItemTypes = new[] { typeof(Book).Name },
                IsPlaceHolder = false,
                DtoOptions = GetDtoOptions()
            };

            SetSorting(query, sort, folder.IsPreSorted);

            var queryResult = folder.GetItems(query);

            return ToResult(queryResult);
        }

        private QueryResult<ServerItem> GetLiveTvChannels(User user, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                StartIndex = startIndex,
                Limit = limit,
            };
            query.IncludeItemTypes = new[] { typeof(LiveTvChannel).Name };

            SetSorting(query, sort, false);

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicFolders(BaseItem item, User user, StubType? stubType, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                StartIndex = startIndex,
                Limit = limit
            };
            SetSorting(query, sort, false);

            if (stubType.HasValue && stubType.Value == StubType.Latest)
            {
                return GetMusicLatest(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Playlists)
            {
                return GetMusicPlaylists(user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Albums)
            {
                return GetMusicAlbums(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Artists)
            {
                return GetMusicArtists(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.AlbumArtists)
            {
                return GetMusicAlbumArtists(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.FavoriteAlbums)
            {
                return GetFavoriteAlbums(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.FavoriteArtists)
            {
                return GetFavoriteArtists(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.FavoriteSongs)
            {
                return GetFavoriteSongs(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Songs)
            {
                return GetMusicSongs(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Genres)
            {
                return GetMusicGenres(item, user, query);
            }

            var list = new List<ServerItem>();

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Latest
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Playlists
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Albums
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.AlbumArtists
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Artists
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Songs
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Genres
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.FavoriteArtists
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.FavoriteAlbums
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.FavoriteSongs
            });

            return new QueryResult<ServerItem>
            {
                Items = list,
                TotalRecordCount = list.Count
            };
        }

        private QueryResult<ServerItem> GetMovieFolders(BaseItem item, User user, StubType? stubType, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                StartIndex = startIndex,
                Limit = limit
            };
            SetSorting(query, sort, false);

            if (stubType.HasValue && stubType.Value == StubType.ContinueWatching)
            {
                return GetMovieContinueWatching(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Latest)
            {
                return GetMovieLatest(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Movies)
            {
                return GetMovieMovies(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Collections)
            {
                return GetMovieCollections(user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Favorites)
            {
                return GetMovieFavorites(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Genres)
            {
                return GetGenres(item, user, query);
            }

            var array = new ServerItem[]
            {
                new ServerItem(item)
                {
                    StubType = StubType.ContinueWatching
                },
                new ServerItem(item)
                {
                    StubType = StubType.Latest
                },
                new ServerItem(item)
                {
                    StubType = StubType.Movies
                },
                new ServerItem(item)
                {
                    StubType = StubType.Collections
                },
                new ServerItem(item)
                {
                    StubType = StubType.Favorites
                },
                new ServerItem(item)
                {
                    StubType = StubType.Genres
                }
            };

            return new QueryResult<ServerItem>
            {
                Items = array,
                TotalRecordCount = array.Length
            };
        }

        private QueryResult<ServerItem> GetFolders(User user, int? startIndex, int? limit)
        {
            var folders = _libraryManager.GetUserRootFolder().GetChildren(user, true)
                .OrderBy(i => i.SortName)
                .Select(i => new ServerItem(i)
                {
                    StubType = StubType.Folder
                })
                .ToArray();

            return ApplyPaging(new QueryResult<ServerItem>
            {
                Items = folders,
                TotalRecordCount = folders.Length
            }, startIndex, limit);
        }

        private QueryResult<ServerItem> GetTvFolders(BaseItem item, User user, StubType? stubType, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                StartIndex = startIndex,
                Limit = limit
            };
            SetSorting(query, sort, false);

            if (stubType.HasValue && stubType.Value == StubType.ContinueWatching)
            {
                return GetMovieContinueWatching(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.NextUp)
            {
                return GetNextUp(item, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Latest)
            {
                return GetTvLatest(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Series)
            {
                return GetSeries(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.FavoriteSeries)
            {
                return GetFavoriteSeries(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.FavoriteEpisodes)
            {
                return GetFavoriteEpisodes(item, user, query);
            }

            if (stubType.HasValue && stubType.Value == StubType.Genres)
            {
                return GetGenres(item, user, query);
            }

            var list = new List<ServerItem>();

            list.Add(new ServerItem(item)
            {
                StubType = StubType.ContinueWatching
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.NextUp
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Latest
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Series
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.FavoriteSeries
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.FavoriteEpisodes
            });

            list.Add(new ServerItem(item)
            {
                StubType = StubType.Genres
            });

            return new QueryResult<ServerItem>
            {
                Items = list,
                TotalRecordCount = list.Count
            };
        }

        private QueryResult<ServerItem> GetMovieContinueWatching(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);

            query.OrderBy = new[]
            {
                (ItemSortBy.DatePlayed, SortOrder.Descending),
                (ItemSortBy.SortName, SortOrder.Ascending)
            };

            query.IsResumable = true;
            query.Limit = 10;

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetSeries(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);

            query.IncludeItemTypes = new[] { typeof(Series).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMovieMovies(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);

            query.IncludeItemTypes = new[] { typeof(Movie).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMovieCollections(User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            //query.Parent = parent;
            query.SetUser(user);

            query.IncludeItemTypes = new[] { typeof(BoxSet).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicAlbums(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);

            query.IncludeItemTypes = new[] { typeof(MusicAlbum).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicSongs(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);

            query.IncludeItemTypes = new[] { typeof(Audio).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetFavoriteSongs(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);
            query.IsFavorite = true;
            query.IncludeItemTypes = new[] { typeof(Audio).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetFavoriteSeries(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);
            query.IsFavorite = true;
            query.IncludeItemTypes = new[] { typeof(Series).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetFavoriteEpisodes(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);
            query.IsFavorite = true;
            query.IncludeItemTypes = new[] { typeof(Episode).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMovieFavorites(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);
            query.IsFavorite = true;
            query.IncludeItemTypes = new[] { typeof(Movie).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetFavoriteAlbums(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.Recursive = true;
            query.Parent = parent;
            query.SetUser(user);
            query.IsFavorite = true;
            query.IncludeItemTypes = new[] { typeof(MusicAlbum).Name };

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetGenres(BaseItem parent, User user, InternalItemsQuery query)
        {
            var genresResult = _libraryManager.GetGenres(new InternalItemsQuery(user)
            {
                AncestorIds = new[] { parent.Id },
                StartIndex = query.StartIndex,
                Limit = query.Limit
            });

            var result = new QueryResult<BaseItem>
            {
                TotalRecordCount = genresResult.TotalRecordCount,
                Items = genresResult.Items.Select(i => i.Item1).ToArray()
            };

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicGenres(BaseItem parent, User user, InternalItemsQuery query)
        {
            var genresResult = _libraryManager.GetMusicGenres(new InternalItemsQuery(user)
            {
                AncestorIds = new[] { parent.Id },
                StartIndex = query.StartIndex,
                Limit = query.Limit
            });

            var result = new QueryResult<BaseItem>
            {
                TotalRecordCount = genresResult.TotalRecordCount,
                Items = genresResult.Items.Select(i => i.Item1).ToArray()
            };

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicAlbumArtists(BaseItem parent, User user, InternalItemsQuery query)
        {
            var artists = _libraryManager.GetAlbumArtists(new InternalItemsQuery(user)
            {
                AncestorIds = new[] { parent.Id },
                StartIndex = query.StartIndex,
                Limit = query.Limit
            });

            var result = new QueryResult<BaseItem>
            {
                TotalRecordCount = artists.TotalRecordCount,
                Items = artists.Items.Select(i => i.Item1).ToArray()
            };

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicArtists(BaseItem parent, User user, InternalItemsQuery query)
        {
            var artists = _libraryManager.GetArtists(new InternalItemsQuery(user)
            {
                AncestorIds = new[] { parent.Id },
                StartIndex = query.StartIndex,
                Limit = query.Limit
            });

            var result = new QueryResult<BaseItem>
            {
                TotalRecordCount = artists.TotalRecordCount,
                Items = artists.Items.Select(i => i.Item1).ToArray()
            };

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetFavoriteArtists(BaseItem parent, User user, InternalItemsQuery query)
        {
            var artists = _libraryManager.GetArtists(new InternalItemsQuery(user)
            {
                AncestorIds = new[] { parent.Id },
                StartIndex = query.StartIndex,
                Limit = query.Limit,
                IsFavorite = true
            });

            var result = new QueryResult<BaseItem>
            {
                TotalRecordCount = artists.TotalRecordCount,
                Items = artists.Items.Select(i => i.Item1).ToArray()
            };

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicPlaylists(User user, InternalItemsQuery query)
        {
            query.Parent = null;
            query.IncludeItemTypes = new[] { typeof(Playlist).Name };
            query.SetUser(user);
            query.Recursive = true;

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicLatest(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.OrderBy = Array.Empty<(string, SortOrder)>();

            var items = _userViewManager.GetLatestItems(new LatestItemsQuery
            {
                UserId = user.Id,
                Limit = 50,
                IncludeItemTypes = new[] { typeof(Audio).Name },
                ParentId = parent == null ? Guid.Empty : parent.Id,
                GroupItems = true

            }, query.DtoOptions).Select(i => i.Item1 ?? i.Item2.FirstOrDefault()).Where(i => i != null).ToArray();

            return ToResult(items);
        }

        private QueryResult<ServerItem> GetNextUp(BaseItem parent, InternalItemsQuery query)
        {
            query.OrderBy = Array.Empty<(string, SortOrder)>();

            var result = _tvSeriesManager.GetNextUp(new NextUpQuery
            {
                Limit = query.Limit,
                StartIndex = query.StartIndex,
                UserId = query.User.Id

            }, new[] { parent }, query.DtoOptions);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetTvLatest(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.OrderBy = Array.Empty<(string, SortOrder)>();

            var items = _userViewManager.GetLatestItems(new LatestItemsQuery
            {
                UserId = user.Id,
                Limit = 50,
                IncludeItemTypes = new[] { typeof(Episode).Name },
                ParentId = parent == null ? Guid.Empty : parent.Id,
                GroupItems = false

            }, query.DtoOptions).Select(i => i.Item1 ?? i.Item2.FirstOrDefault()).Where(i => i != null).ToArray();

            return ToResult(items);
        }

        private QueryResult<ServerItem> GetMovieLatest(BaseItem parent, User user, InternalItemsQuery query)
        {
            query.OrderBy = Array.Empty<(string, SortOrder)>();

            var items = _userViewManager.GetLatestItems(new LatestItemsQuery
            {
                UserId = user.Id,
                Limit = 50,
                IncludeItemTypes = new[] { typeof(Movie).Name },
                ParentId = parent == null ? Guid.Empty : parent.Id,
                GroupItems = true

            }, query.DtoOptions).Select(i => i.Item1 ?? i.Item2.FirstOrDefault()).Where(i => i != null).ToArray();

            return ToResult(items);
        }

        private QueryResult<ServerItem> GetMusicArtistItems(BaseItem item, Guid parentId, User user, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                Recursive = true,
                ParentId = parentId,
                ArtistIds = new[] { item.Id },
                IncludeItemTypes = new[] { typeof(MusicAlbum).Name },
                Limit = limit,
                StartIndex = startIndex,
                DtoOptions = GetDtoOptions()
            };

            SetSorting(query, sort, false);

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetGenreItems(BaseItem item, Guid parentId, User user, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                Recursive = true,
                ParentId = parentId,
                GenreIds = new[] { item.Id },
                IncludeItemTypes = new[] { typeof(Movie).Name, typeof(Series).Name },
                Limit = limit,
                StartIndex = startIndex,
                DtoOptions = GetDtoOptions()
            };

            SetSorting(query, sort, false);

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> GetMusicGenreItems(BaseItem item, Guid parentId, User user, SortCriteria sort, int? startIndex, int? limit)
        {
            var query = new InternalItemsQuery(user)
            {
                Recursive = true,
                ParentId = parentId,
                GenreIds = new[] { item.Id },
                IncludeItemTypes = new[] { typeof(MusicAlbum).Name },
                Limit = limit,
                StartIndex = startIndex,
                DtoOptions = GetDtoOptions()
            };

            SetSorting(query, sort, false);

            var result = _libraryManager.GetItemsResult(query);

            return ToResult(result);
        }

        private QueryResult<ServerItem> ToResult(BaseItem[] result)
        {
            var serverItems = result
                .Select(i => new ServerItem(i))
                .ToArray();

            return new QueryResult<ServerItem>
            {
                TotalRecordCount = result.Length,
                Items = serverItems
            };
        }

        private QueryResult<ServerItem> ToResult(QueryResult<BaseItem> result)
        {
            var serverItems = result
                .Items
                .Select(i => new ServerItem(i))
                .ToArray();

            return new QueryResult<ServerItem>
            {
                TotalRecordCount = result.TotalRecordCount,
                Items = serverItems
            };
        }

        private void SetSorting(InternalItemsQuery query, SortCriteria sort, bool isPreSorted)
        {
            if (isPreSorted)
            {
                query.OrderBy = Array.Empty<(string, SortOrder)>();
            }
            else
            {
                query.OrderBy = new[] { (ItemSortBy.SortName, sort.SortOrder) };
            }
        }

        private QueryResult<ServerItem> ApplyPaging(QueryResult<ServerItem> result, int? startIndex, int? limit)
        {
            result.Items = result.Items.Skip(startIndex ?? 0).Take(limit ?? int.MaxValue).ToArray();

            return result;
        }

        private ServerItem GetItemFromObjectId(string id)
        {
            return DidlBuilder.IsIdRoot(id)

                 ? new ServerItem(_libraryManager.GetUserRootFolder())
                 : ParseItemId(id);
        }

        private ServerItem ParseItemId(string id)
        {
            StubType? stubType = null;

            // After using PlayTo, MediaMonkey sends a request to the server trying to get item info
            const string ParamsSrch = "Params=";
            var paramsIndex = id.IndexOf(ParamsSrch, StringComparison.OrdinalIgnoreCase);
            if (paramsIndex != -1)
            {
                id = id.Substring(paramsIndex + ParamsSrch.Length);

                var parts = id.Split(';');
                id = parts[23];
            }

            var enumNames = Enum.GetNames(typeof(StubType));
            foreach (var name in enumNames)
            {
                if (id.StartsWith(name + "_", StringComparison.OrdinalIgnoreCase))
                {
                    stubType = (StubType)Enum.Parse(typeof(StubType), name, true);
                    id = id.Split(new[] { '_' }, 2)[1];

                    break;
                }
            }

            if (Guid.TryParse(id, out var itemId))
            {
                var item = _libraryManager.GetItemById(itemId);

                return new ServerItem(item)
                {
                    StubType = stubType
                };
            }

            Logger.LogError("Error parsing item Id: {id}. Returning user root folder.", id);

            return new ServerItem(_libraryManager.GetUserRootFolder());
        }
    }

    internal class ServerItem
    {
        public BaseItem Item { get; set; }
        public StubType? StubType { get; set; }

        public ServerItem(BaseItem item)
        {
            Item = item;

            if (item is IItemByName && !(item is Folder))
            {
                StubType = Dlna.ContentDirectory.StubType.Folder;
            }
        }
    }

    public enum StubType
    {
        Folder = 0,
        Latest = 2,
        Playlists = 3,
        Albums = 4,
        AlbumArtists = 5,
        Artists = 6,
        Songs = 7,
        Genres = 8,
        FavoriteSongs = 9,
        FavoriteArtists = 10,
        FavoriteAlbums = 11,
        ContinueWatching = 12,
        Movies = 13,
        Collections = 14,
        Favorites = 15,
        NextUp = 16,
        Series = 17,
        FavoriteSeries = 18,
        FavoriteEpisodes = 19
    }
}