Implement first playlist generation, still much to do.

Jellyfin.Plugin.SmartPlaylist/Lisp/Compiler/Parser.cs

@@ -28,10 +28,25 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler {
     interface IComparable<T, E> where T : IComparable<T, E> {
         static abstract E operator ==(T left, T right);
         static abstract E operator !=(T left, T right);
+        E Equals(T other);
     }
 
-    public abstract class Expression : IFormattable {
+    public abstract class Expression: IFormattable, IComparable<Expression, bool> {
         public abstract string ToString(string? format, IFormatProvider? provider);
+        public abstract override int GetHashCode();
+        public abstract bool Equals(Expression other);
+        public override bool Equals(object? other) {
+            if (other is Expression other_e) {
+                return Equals(other_e);
+            }
+            return false;
+        }
+        public static bool operator ==(Expression left, Expression right) {
+            return left.Equals(right);
+        }
+        public static bool operator !=(Expression left, Expression right) {
+            return !left.Equals(right);
+        }
     }
     public abstract class Atom : Expression {}
     public class Symbol : Atom {
@@ -40,34 +55,67 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler {
             _name = name;
         }
         public string name { get => _name; }
+        public override int GetHashCode() {
+            int hash = 17;
+            hash *= 23;
+            hash += _name.GetHashCode();
+            return hash;
+        }
+        public override bool Equals(Expression? other) {
+            if (other is Symbol other_s) {
+                return _name == other_s._name;
+            }
+            return false;
+        }
         public override string ToString(string? format, IFormatProvider? provider) {
             return _name;
         }
     }
-    public class Boolean : Atom, IComparable<Boolean, Boolean> {
+
+    public class Boolean : Atom {
         private readonly bool _value;
         public Boolean(bool value) {
             _value = value;
         }
         public bool value { get => _value; }
+        public override int GetHashCode() {
+            int hash = 17;
+            hash *= 23;
+            hash += _value.GetHashCode();
+            return hash;
+        }
+        public override bool Equals(Expression other) {
+            if (other is Boolean other_b) {
+                return _value == other_b.value;
+            }
+            return false;
+        }
         public override string ToString(string? format, IFormatProvider? provider) {
             return _value? "t" : "nil";
         }
-        public static Boolean operator ==(Boolean a, Boolean b) {
-            return new Boolean(a.value == b.value);
-        }
-        public static Boolean operator !=(Boolean a, Boolean b) {
-            return new Boolean(a.value != b.value);
-        }
     }
-    public class Integer : Atom, IAddable<Integer>, ISubtractable<Integer>, IMultiplicatable<Integer>, IDivisible<Integer>, ISortable<Integer, Boolean>, IComparable<Integer, Boolean> {
+
+    public class Integer : Atom, IAddable<Integer>, ISubtractable<Integer>, IMultiplicatable<Integer>, IDivisible<Integer>, ISortable<Integer, Boolean> {
         private readonly int _value;
         public Integer(int value) {
             _value = value;
         }
         public int value { get => _value; }
+        public override int GetHashCode() {
+            int hash = 17;
+            hash *= 23;
+            hash += _value.GetHashCode();
+            return hash;
+        }
+        public override bool Equals(Expression other) {
+            if (other is Integer other_i) {
+                return _value == other_i._value;
+            }
+            return false;
+        }
         public override string ToString(string? format, IFormatProvider? provider) {
-            return _value.ToString("0", provider);
+            return _value.ToString();
+            //return _value.ToString("0", provider);
         }
         public static Integer operator +(Integer a, Integer b) {
             return new Integer(a.value + b.value);
@@ -103,12 +151,25 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler {
             return new Boolean(a.value != b.value);
         }
     }
+
     public class String : Atom, IAddable<String> {
         private readonly string _value;
         public String(string value) {
             _value = value;
         }
         public string value { get => _value; }
+        public override int GetHashCode() {
+            int hash = 17;
+            hash *= 23;
+            hash += _value.GetHashCode();
+            return hash;
+        }
+        public override bool Equals(Expression other) {
+            if (other is String other_s) {
+                return _value == other_s._value;
+            }
+            return false;
+        }
         public override string ToString(string? format, IFormatProvider? provider) {
             return "\"" + _value + "\"";
         }
@@ -116,12 +177,25 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler {
             return new String (a.value + b.value);
         }
     }
+
     public class Object : Atom {
         private readonly object _value;
         public Object(object value) {
             _value = value;
         }
         public object value { get => _value; }
+        public override int GetHashCode() {
+            int hash = 17;
+            hash *= 23;
+            hash += _value.GetHashCode();
+            return hash;
+        }
+        public override bool Equals(Expression other) {
+            if (other is Object other_o) {
+                return _value == other_o._value;
+            }
+            return false;
+        }
         public override string ToString(string? format, IFormatProvider? provider) {
             return _value.ToString();
         }
@@ -145,13 +219,22 @@ namespace Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler {
             _expressions = expressions;
         }
         public IList<Expression> expressions { get => _expressions; }
-        public override string ToString(string? format, IFormatProvider? provider) {
-            string r = "(";
-            foreach (var e in _expressions) {
-                r += " ";
-                r += e.ToString("0", provider);
+        public override int GetHashCode() {
+            int hash = 17;
+            foreach (Expression i in _expressions) {
+                hash *= 23;
+                hash += i.GetHashCode();
             }
-            return r + ")";
+            return hash;
+        }
+        public override bool Equals(Expression other) {
+            if (other is List other_l) {
+                return _expressions == other_l._expressions;
+            }
+            return false;
+        }
+        public override string ToString(string? format, IFormatProvider? provider) {
+            return "(" + string.Join(" ", _expressions.Select(x => x.ToString("0", provider))) + ")";
         }
         public static List operator +(List a, List b) {
             List<Expression> r = new List<Expression>();

Jellyfin.Plugin.SmartPlaylist/ScheduledTasks/GeneratePlaylist.cs

@@ -22,20 +22,39 @@ using MediaBrowser.Model.Playlists;
 using MediaBrowser.Model.Tasks;
 using Microsoft.Extensions.Logging;
 
+using Jellyfin.Plugin.SmartPlaylist.Lisp;
+using Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler;
+using Lisp_Object = Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler.Object;
+using Lisp_Boolean = Jellyfin.Plugin.SmartPlaylist.Lisp.Compiler.Boolean;
+
+
 namespace Jellyfin.Plugin.SmartPlaylist.ScheduledTasks {
     public class GeneratePlaylist : IScheduledTask {
+
+        public static readonly BaseItemKind[] AvailableFilterItems = {
+            BaseItemKind.Audio
+        };
+
         private readonly ILogger _logger;
         private readonly ILibraryManager _libraryManager;
         private readonly IUserManager _userManager;
+        private readonly IPlaylistManager _playlistManager;
+
+        private readonly IStore _store;
 
         public GeneratePlaylist(
             ILogger<Plugin> logger,
             ILibraryManager libraryManager,
-            IUserManager userManager
+            IUserManager userManager,
+            IPlaylistManager playlistManager,
+            IServerApplicationPaths serverApplicationPaths
         ) {
             _logger = logger;
             _libraryManager = libraryManager;
             _userManager = userManager;
+            _playlistManager = playlistManager;
+
+            _store = new Store(new FileSystem(serverApplicationPaths));
         }
 
         public string Category => "Library";
@@ -46,7 +65,7 @@ namespace Jellyfin.Plugin.SmartPlaylist.ScheduledTasks {
         public IEnumerable<TaskTriggerInfo> GetDefaultTriggers() {
             return new[] {
                 new TaskTriggerInfo {
-                    IntervalTicks = TimeSpan.FromMinutes(1).Ticks,
+                    IntervalTicks = TimeSpan.FromHours(24).Ticks,
                     Type = TaskTriggerInfo.TriggerInterval,
                 }
             };
@@ -56,7 +75,7 @@ namespace Jellyfin.Plugin.SmartPlaylist.ScheduledTasks {
             foreach (var user in _userManager.Users) {
                 _logger.LogInformation("User {0}", user);
                 var query = new InternalItemsQuery(user) {
-                    IncludeItemTypes = new[] {BaseItemKind.Audio},
+                    IncludeItemTypes = AvailableFilterItems,
                     Recursive = true,
                 };
                 foreach (BaseItem item in _libraryManager.GetItemsResult(query).Items) {
@@ -65,9 +84,66 @@ namespace Jellyfin.Plugin.SmartPlaylist.ScheduledTasks {
             }
         }
 
+        private SmartPlaylistId CreateNewPlaylist(SmartPlaylistDto dto, User user) {
+            var req = new PlaylistCreationRequest {
+                Name = dto.Name,
+                UserId = user.Id
+            };
+            return Guid.Parse(_playlistManager.CreatePlaylist(req).Result.Id);
+        }
+
+        private IEnumerable<Guid> FilterPlaylistItems(IEnumerable<BaseItem> items, User user, SmartPlaylistDto smartPlaylist) {
+            List<Guid> results = new List<Guid>();
+            Expression expression = new Parser(StringTokenStream.generate(smartPlaylist.Program)).parse();
+            Executor executor = new Executor();
+            foreach (var i in items) {
+                executor.environment["item"] = new Lisp_Object(i);
+                var r = executor.eval(expression);
+                _logger.LogInformation("Item {0} evaluated to {1}", i, r.ToString());
+                if (r is Lisp_Boolean r_bool) {
+                    if (r_bool.value) { results.Add(i.Id); }
+                } else {
+                    _logger.LogInformation("Program did not return a boolean, returned {0}", r.ToString());
+                }
+            }
+            return results;
+        }
+
+        private IEnumerable<BaseItem> GetAllUserMedia(User user) {
+            var req = new InternalItemsQuery(user) {
+                IncludeItemTypes = new[] {BaseItemKind.Audio},
+                Recursive = true,
+            };
+            return _libraryManager.GetItemsResult(req).Items;
+        }
+
         public async Task ExecuteAsync(IProgress<double> progress, CancellationToken cancellationToken) {
-            _logger.LogInformation("This is a test");
-            GetUsers();
+            _logger.LogInformation("Started regenerate Smart Playlists");
+            foreach (SmartPlaylistDto dto in await _store.GetAllSmartPlaylistsAsync()) {
+                var user = _userManager.GetUserById(dto.User);
+                List<Playlist> playlists = _playlistManager.GetPlaylists(user.Id).Where(x => x.Id == dto.Id).ToList();
+                if ((dto.Id == null) || !playlists.Any()) {
+                    _logger.LogInformation("Generating new smart playlist (dto.Id = {0}, playlists.Any() = {1})", dto.Id, playlists.Any());
+                    _store.DeleteSmartPlaylist(dto.Id);
+                    dto.Id = CreateNewPlaylist(dto, user);
+                    await _store.SaveSmartPlaylistAsync(dto);
+                    playlists = _playlistManager.GetPlaylists(user.Id).Where(x => x.Id == dto.Id).ToList();
+                }
+                var insertItems = FilterPlaylistItems(GetAllUserMedia(user), user, dto);
+                Playlist playlist = playlists.First();
+                await ClearPlaylist(dto, playlist, user);
+                await _playlistManager.AddItemToPlaylistAsync(playlist.Id, insertItems.ToArray(), user.Id);
+            }
+        }
+
+        private async Task ClearPlaylist(SmartPlaylistDto smartPlaylist, Playlist playlist, User user) {
+            var req = new InternalItemsQuery(user)
+            {
+                IncludeItemTypes = AvailableFilterItems,
+                Recursive = true
+            };
+            var existingItems = playlist.GetChildren(user, false, req).Select(x => x.Id.ToString()).ToList();
+            await _playlistManager.RemoveItemFromPlaylistAsync(playlist.Id.ToString(), existingItems);
         }
     }
 }

Jellyfin.Plugin.SmartPlaylist/SmartPlaylistDto.cs

@@ -0,0 +1,11 @@
+namespace Jellyfin.Plugin.SmartPlaylist {
+    [Serializable]
+    public class SmartPlaylistDto {
+        public SmartPlaylistId Id { get; set; }
+        public string Name { get; set; }
+        public string FileName { get; set; }
+        public UserId User { get; set; }
+        public string Program { get; set; }
+        public int MaxItems { get; set; }
+    }
+}

Jellyfin.Plugin.SmartPlaylist/SmartPlaylistFileSystem.cs

@@ -0,0 +1,28 @@
+using MediaBrowser.Controller;
+
+namespace Jellyfin.Plugin.SmartPlaylist {
+
+    public interface ISmartPlaylistFileSystem {
+        public string StoragePath { get; }
+        public string GetSmartPlaylistFilePath(SmartPlaylistId smartPlaylistId);
+        public string FindSmartPlaylistFilePath(SmartPlaylistId smartPlaylistId);
+        public string[] FindAllSmartPlaylistFilePaths();
+    }
+
+    public class FileSystem : ISmartPlaylistFileSystem {
+        public FileSystem(IServerApplicationPaths serverApplicationPaths) {
+            StoragePath = Path.Combine(serverApplicationPaths.DataPath, "smartplaylists");
+            if (!Directory.Exists(StoragePath)) { Directory.CreateDirectory(StoragePath); }
+        }
+        public string StoragePath { get; }
+        public string GetSmartPlaylistFilePath(SmartPlaylistId smartPlaylistId) {
+            return Path.Combine(StoragePath, $"{smartPlaylistId}.json");
+        }
+        public string FindSmartPlaylistFilePath(SmartPlaylistId smartPlaylistId) {
+            return Directory.GetFiles(StoragePath, $"{smartPlaylistId}.json", SearchOption.AllDirectories).First();
+        }
+        public string[] FindAllSmartPlaylistFilePaths() {
+            return Directory.GetFiles(StoragePath);
+        }
+    }
+}

Jellyfin.Plugin.SmartPlaylist/Store.cs

@@ -0,0 +1,39 @@
+using System.Text.Json;
+
+namespace Jellyfin.Plugin.SmartPlaylist {
+    public interface IStore {
+        Task<SmartPlaylistDto?> GetSmartPlaylistAsync(SmartPlaylistId smartPlaylistId);
+        Task<SmartPlaylistDto[]> GetAllSmartPlaylistsAsync();
+        Task SaveSmartPlaylistAsync(SmartPlaylistDto smartPlaylist);
+        void DeleteSmartPlaylist(SmartPlaylistId smartPlaylistId);
+    }
+
+    public class Store : IStore {
+        private readonly ISmartPlaylistFileSystem _fileSystem;
+        public Store(ISmartPlaylistFileSystem fileSystem) {
+            _fileSystem = fileSystem;
+        }
+        private async Task<SmartPlaylistDto?> LoadPlaylistAsync(string filename) {
+            await using var r = File.OpenRead(filename);
+            return await JsonSerializer.DeserializeAsync<SmartPlaylistDto>(r).ConfigureAwait(false);
+        }
+        public async Task<SmartPlaylistDto?> GetSmartPlaylistAsync(SmartPlaylistId smartPlaylistId) {
+            string filename = _fileSystem.FindSmartPlaylistFilePath(smartPlaylistId);
+            return await LoadPlaylistAsync(filename).ConfigureAwait(false);
+        }
+        public async Task<SmartPlaylistDto[]> GetAllSmartPlaylistsAsync() {
+            var t = _fileSystem.FindAllSmartPlaylistFilePaths().Select(LoadPlaylistAsync).ToArray();
+            await Task.WhenAll(t).ConfigureAwait(false);
+            return t.Where(x => x != null).Select(x => x.Result).ToArray();
+        }
+        public async Task SaveSmartPlaylistAsync(SmartPlaylistDto smartPlaylist) {
+            string filename = _fileSystem.GetSmartPlaylistFilePath(smartPlaylist.Id);
+            await using var w = File.Create(filename);
+            await JsonSerializer.SerializeAsync(w, smartPlaylist).ConfigureAwait(false);
+        }
+        public void DeleteSmartPlaylist(SmartPlaylistId smartPlaylistId) {
+            string filename = _fileSystem.FindSmartPlaylistFilePath(smartPlaylistId);
+            if (File.Exists(filename)) { File.Delete(filename); }
+        }
+    }
+}

Jellyfin.Plugin.SmartPlaylist/Types.cs

@@ -0,0 +1,4 @@
+global using System;
+
+global using UserId = System.Guid;
+global using SmartPlaylistId = System.Guid;