mecomp_daemon/

controller.rs

//----------------------------------------------------------------------------------------- std lib
use std::{ops::Range, path::PathBuf, sync::Arc, time::Duration};
//--------------------------------------------------------------------------------- other libraries
use ::tarpc::context::Context;
use log::{debug, error, info, warn};
use rand::seq::SliceRandom;
use surrealdb::{engine::local::Db, Surreal};
use tap::TapFallible;
use tokio::sync::{Mutex, RwLock};
use tracing::{instrument, Instrument};
//-------------------------------------------------------------------------------- MECOMP libraries
use mecomp_core::{
    audio::{
        commands::{AudioCommand, QueueCommand, VolumeCommand},
        AudioKernelSender,
    },
    errors::SerializableLibraryError,
    rpc::{
        AlbumId, ArtistId, CollectionId, DynamicPlaylistId, MusicPlayer, PlaylistId, SearchResult,
        SongId,
    },
    state::{
        library::{LibraryBrief, LibraryFull, LibraryHealth},
        RepeatMode, SeekType, StateAudio,
    },
    udp::{Event, Message, Sender},
};
use mecomp_storage::{
    db::schemas::{
        self,
        album::{Album, AlbumBrief},
        artist::{Artist, ArtistBrief},
        collection::{Collection, CollectionBrief},
        dynamic::{query::Query, DynamicPlaylist, DynamicPlaylistChangeSet},
        playlist::{Playlist, PlaylistBrief, PlaylistChangeSet},
        song::{Song, SongBrief},
    },
    errors::Error,
};
use one_or_many::OneOrMany;

use crate::{
    config::Settings,
    services::{self, get_songs_from_things},
};

#[derive(Clone, Debug)]
pub struct MusicPlayerServer {
    db: Arc<Surreal<Db>>,
    settings: Arc<Settings>,
    audio_kernel: Arc<AudioKernelSender>,
    library_rescan_lock: Arc<Mutex<()>>,
    library_analyze_lock: Arc<Mutex<()>>,
    collection_recluster_lock: Arc<Mutex<()>>,
    publisher: Arc<RwLock<Sender<Message>>>,
}

impl MusicPlayerServer {
    #[must_use]
    pub fn new(
        db: Arc<Surreal<Db>>,
        settings: Arc<Settings>,
        audio_kernel: Arc<AudioKernelSender>,
        event_publisher: Arc<RwLock<Sender<Message>>>,
    ) -> Self {
        Self {
            db,
            publisher: event_publisher,
            settings,
            audio_kernel,
            library_rescan_lock: Arc::new(Mutex::new(())),
            library_analyze_lock: Arc::new(Mutex::new(())),
            collection_recluster_lock: Arc::new(Mutex::new(())),
        }
    }

    /// Publish a message to all listeners.
    ///
    /// # Errors
    ///
    /// Returns an error if the message could not be sent or encoded.
    #[instrument]
    pub async fn publish(
        &self,
        message: impl Into<Message> + Send + Sync + std::fmt::Debug,
    ) -> Result<(), mecomp_core::errors::UdpError> {
        self.publisher.read().await.send(message).await
    }
}

impl MusicPlayer for MusicPlayerServer {
    #[instrument]
    async fn register_listener(self, context: Context, listener_addr: std::net::SocketAddr) {
        info!("Registering listener: {listener_addr}");
        self.publisher.write().await.add_subscriber(listener_addr);
    }

    async fn ping(self, _: Context) -> String {
        "pong".to_string()
    }

    /// Rescans the music library, only error is if a rescan is already in progress.
    #[instrument]
    async fn library_rescan(self, context: Context) -> Result<(), SerializableLibraryError> {
        info!("Rescanning library");

        if self.library_rescan_lock.try_lock().is_err() {
            warn!("Library rescan already in progress");
            return Err(SerializableLibraryError::RescanInProgress);
        }

        let span = tracing::Span::current();

        std::thread::Builder::new()
            .name(String::from("Library Rescan"))
            .spawn(move || {
                futures::executor::block_on(
                    async {
                        let _guard = self.library_rescan_lock.lock().await;
                        match services::library::rescan(
                            &self.db,
                            &self.settings.daemon.library_paths,
                            &self.settings.daemon.artist_separator,
                            self.settings.daemon.genre_separator.as_deref(),
                            self.settings.daemon.conflict_resolution,
                        )
                        .await
                        {
                            Ok(()) => info!("Library rescan complete"),
                            Err(e) => error!("Error in library_rescan: {e}"),
                        }

                        let result = self.publish(Event::LibraryRescanFinished).await;
                        if let Err(e) = result {
                            error!("Error notifying clients that library_rescan_finished: {e}");
                        }
                    }
                    .instrument(span),
                );
            })?;

        Ok(())
    }
    /// Check if a rescan is in progress.
    #[instrument]
    async fn library_rescan_in_progress(self, context: Context) -> bool {
        self.library_rescan_lock.try_lock().is_err()
    }
    /// Analyze the music library, only error is if an analysis is already in progress.
    #[instrument]
    async fn library_analyze(self, context: Context) -> Result<(), SerializableLibraryError> {
        #[cfg(not(feature = "analysis"))]
        {
            warn!("Analysis is not enabled");
            return Err(SerializableLibraryError::AnalysisNotEnabled);
        }

        #[cfg(feature = "analysis")]
        {
            info!("Analyzing library");

            if self.library_analyze_lock.try_lock().is_err() {
                warn!("Library analysis already in progress");
                return Err(SerializableLibraryError::AnalysisInProgress);
            }
            let span = tracing::Span::current();

            std::thread::Builder::new()
                .name(String::from("Library Analysis"))
                .spawn(move || {
                    futures::executor::block_on(
                        async {
                            let _guard = self.library_analyze_lock.lock().await;
                            match services::library::analyze(&self.db).await {
                                Ok(()) => info!("Library analysis complete"),
                                Err(e) => error!("Error in library_analyze: {e}"),
                            }

                            let result = &self.publish(Event::LibraryAnalysisFinished).await;
                            if let Err(e) = result {
                                error!(
                                    "Error notifying clients that library_analysis_finished: {e}"
                                );
                            }
                        }
                        .instrument(span),
                    );
                })?;

            Ok(())
        }
    }
    /// Check if an analysis is in progress.
    #[instrument]
    async fn library_analyze_in_progress(self, context: Context) -> bool {
        self.library_analyze_lock.try_lock().is_err()
    }
    /// Recluster the music library, only error is if a recluster is already in progress.
    #[instrument]
    async fn library_recluster(self, context: Context) -> Result<(), SerializableLibraryError> {
        #[cfg(not(feature = "analysis"))]
        {
            warn!("Analysis is not enabled");
            return Err(SerializableLibraryError::AnalysisNotEnabled);
        }

        #[cfg(feature = "analysis")]
        {
            info!("Reclustering collections");

            if self.collection_recluster_lock.try_lock().is_err() {
                warn!("Collection reclustering already in progress");
                return Err(SerializableLibraryError::ReclusterInProgress);
            }

            let span = tracing::Span::current();

            std::thread::Builder::new()
                .name(String::from("Collection Recluster"))
                .spawn(move || {
                    futures::executor::block_on(
                        async {
                            let _guard = self.collection_recluster_lock.lock().await;
                            match services::library::recluster(
                                &self.db,
                                &self.settings.reclustering,
                            )
                            .await
                            {
                                Ok(()) => info!("Collection reclustering complete"),
                                Err(e) => error!("Error in collection_recluster: {e}"),
                            }

                            let result = &self.publish(Event::LibraryReclusterFinished).await;
                            if let Err(e) = result {
                                error!(
                                    "Error notifying clients that library_recluster_finished: {e}"
                                );
                            }
                        }
                        .instrument(span),
                    );
                })?;

            Ok(())
        }
    }
    /// Check if a recluster is in progress.
    #[instrument]
    async fn library_recluster_in_progress(self, context: Context) -> bool {
        self.collection_recluster_lock.try_lock().is_err()
    }
    /// Returns brief information about the music library.
    #[instrument]
    async fn library_brief(
        self,
        context: Context,
    ) -> Result<LibraryBrief, SerializableLibraryError> {
        info!("Creating library brief");
        Ok(services::library::brief(&self.db)
            .await
            .tap_err(|e| warn!("Error in library_brief: {e}"))?)
    }
    /// Returns full information about the music library. (all songs, artists, albums, etc.)
    #[instrument]
    async fn library_full(self, context: Context) -> Result<LibraryFull, SerializableLibraryError> {
        info!("Creating library full");
        Ok(services::library::full(&self.db)
            .await
            .tap_err(|e| warn!("Error in library_full: {e}"))?)
    }
    /// Returns brief information about the music library's artists.
    #[instrument]
    async fn library_artists_brief(
        self,
        context: Context,
    ) -> Result<Box<[ArtistBrief]>, SerializableLibraryError> {
        info!("Creating library artists brief");
        Ok(Artist::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in library_artists_brief: {e}"))?
            .iter()
            .map(std::convert::Into::into)
            .collect())
    }
    /// Returns full information about the music library's artists.
    #[instrument]
    async fn library_artists_full(
        self,
        context: Context,
    ) -> Result<Box<[Artist]>, SerializableLibraryError> {
        info!("Creating library artists full");
        Ok(Artist::read_all(&self.db)
            .await
            .map(std::vec::Vec::into_boxed_slice)
            .tap_err(|e| warn!("Error in library_artists_brief: {e}"))?)
    }
    /// Returns brief information about the music library's albums.
    #[instrument]
    async fn library_albums_brief(
        self,
        context: Context,
    ) -> Result<Box<[AlbumBrief]>, SerializableLibraryError> {
        info!("Creating library albums brief");
        Ok(Album::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in library_albums_brief: {e}"))?
            .iter()
            .map(std::convert::Into::into)
            .collect())
    }
    /// Returns full information about the music library's albums.
    #[instrument]
    async fn library_albums_full(
        self,
        context: Context,
    ) -> Result<Box<[Album]>, SerializableLibraryError> {
        info!("Creating library albums full");
        Ok(Album::read_all(&self.db)
            .await
            .map(std::vec::Vec::into_boxed_slice)
            .tap_err(|e| warn!("Error in library_albums_full: {e}"))?)
    }
    /// Returns brief information about the music library's songs.
    #[instrument]
    async fn library_songs_brief(
        self,
        context: Context,
    ) -> Result<Box<[SongBrief]>, SerializableLibraryError> {
        info!("Creating library songs brief");
        Ok(Song::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in library_songs_brief: {e}"))?
            .iter()
            .map(std::convert::Into::into)
            .collect())
    }
    /// Returns full information about the music library's songs.
    #[instrument]
    async fn library_songs_full(
        self,
        context: Context,
    ) -> Result<Box<[Song]>, SerializableLibraryError> {
        info!("Creating library songs full");
        Ok(Song::read_all(&self.db)
            .await
            .map(std::vec::Vec::into_boxed_slice)
            .tap_err(|e| warn!("Error in library_songs_full: {e}"))?)
    }
    /// Returns information about the health of the music library (are there any missing files, etc.)
    #[instrument]
    async fn library_health(
        self,
        context: Context,
    ) -> Result<LibraryHealth, SerializableLibraryError> {
        info!("Creating library health");
        Ok(services::library::health(&self.db)
            .await
            .tap_err(|e| warn!("Error in library_health: {e}"))?)
    }
    /// Get a song by its ID.
    #[instrument]
    async fn library_song_get(self, context: Context, id: SongId) -> Option<Song> {
        let id = id.into();
        info!("Getting song by ID: {id}");
        Song::read(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_song_get: {e}"))
            .ok()
            .flatten()
    }
    /// Get a song by its file path.
    #[instrument]
    async fn library_song_get_by_path(self, context: Context, path: PathBuf) -> Option<Song> {
        info!("Getting song by path: {}", path.display());
        Song::read_by_path(&self.db, path)
            .await
            .tap_err(|e| warn!("Error in library_song_get_by_path: {e}"))
            .ok()
            .flatten()
    }
    /// Get the artists of a song.
    #[instrument]
    async fn library_song_get_artist(self, context: Context, id: SongId) -> OneOrMany<Artist> {
        let id = id.into();
        info!("Getting artist of: {id}");
        Song::read_artist(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_song_get_artist: {e}"))
            .ok()
            .into()
    }
    /// Get the album of a song.
    #[instrument]
    async fn library_song_get_album(self, context: Context, id: SongId) -> Option<Album> {
        let id = id.into();
        info!("Getting album of: {id}");
        Song::read_album(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_song_get_album: {e}"))
            .ok()
            .flatten()
    }
    /// Get the Playlists a song is in.
    #[instrument]
    async fn library_song_get_playlists(self, context: Context, id: SongId) -> Box<[Playlist]> {
        let id = id.into();
        info!("Getting playlists of: {id}");
        Song::read_playlists(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_song_get_playlists: {e}"))
            .ok()
            .unwrap_or_default()
            .into()
    }
    /// Get the Collections a song is in.
    #[instrument]
    async fn library_song_get_collections(self, context: Context, id: SongId) -> Box<[Collection]> {
        let id = id.into();
        info!("Getting collections of: {id}");
        Song::read_collections(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_song_get_collections: {e}"))
            .ok()
            .unwrap_or_default()
            .into()
    }

    /// Get an album by its ID.
    #[instrument]
    async fn library_album_get(self, context: Context, id: AlbumId) -> Option<Album> {
        let id = id.into();
        info!("Getting album by ID: {id}");
        Album::read(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_album_get: {e}"))
            .ok()
            .flatten()
    }
    /// Get the artists of an album
    #[instrument]
    async fn library_album_get_artist(self, context: Context, id: AlbumId) -> OneOrMany<Artist> {
        let id = id.into();
        info!("Getting artists of: {id}");
        Album::read_artist(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_album_get_artist: {e}"))
            .ok()
            .into()
    }
    /// Get the songs of an album
    #[instrument]
    async fn library_album_get_songs(self, context: Context, id: AlbumId) -> Option<Box<[Song]>> {
        let id = id.into();
        info!("Getting songs of: {id}");
        Album::read_songs(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_album_get_songs: {e}"))
            .ok()
            .map(Into::into)
    }
    /// Get an artist by its ID.
    #[instrument]
    async fn library_artist_get(self, context: Context, id: ArtistId) -> Option<Artist> {
        let id = id.into();
        info!("Getting artist by ID: {id}");
        Artist::read(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_artist_get: {e}"))
            .ok()
            .flatten()
    }
    /// Get the songs of an artist
    #[instrument]
    async fn library_artist_get_songs(self, context: Context, id: ArtistId) -> Option<Box<[Song]>> {
        let id = id.into();
        info!("Getting songs of: {id}");
        Artist::read_songs(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_artist_get_songs: {e}"))
            .ok()
            .map(Into::into)
    }
    /// Get the albums of an artist
    #[instrument]
    async fn library_artist_get_albums(
        self,
        context: Context,
        id: ArtistId,
    ) -> Option<Box<[Album]>> {
        let id = id.into();
        info!("Getting albums of: {id}");
        Artist::read_albums(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in library_artist_get_albums: {e}"))
            .ok()
            .map(Into::into)
    }

    /// tells the daemon to shutdown.
    #[instrument]
    async fn daemon_shutdown(self, context: Context) {
        let publisher = self.publisher.clone();
        let audio_kernel = self.audio_kernel.clone();
        std::thread::Builder::new()
            .name(String::from("Daemon Shutdown"))
            .spawn(move || {
                std::thread::sleep(std::time::Duration::from_secs(1));
                let _ = futures::executor::block_on(
                    publisher.blocking_read().send(Event::DaemonShutdown),
                );
                audio_kernel.send(AudioCommand::Exit);
                std::process::exit(0);
            })
            .unwrap();
        info!("Shutting down daemon in 1 second");
    }

    /// returns full information about the current state of the audio player (queue, current song, etc.)
    #[instrument]
    async fn state_audio(self, context: Context) -> Option<StateAudio> {
        debug!("Getting state of audio player");
        let (tx, rx) = tokio::sync::oneshot::channel();

        self.audio_kernel.send(AudioCommand::ReportStatus(tx));

        rx.await
            .tap_err(|e| warn!("Error in state_audio: {e}"))
            .ok()
    }

    /// returns the current artist.
    #[instrument]
    async fn current_artist(self, context: Context) -> OneOrMany<Artist> {
        info!("Getting current artist");
        let (tx, rx) = tokio::sync::oneshot::channel();

        self.audio_kernel.send(AudioCommand::ReportStatus(tx));

        if let Some(song) = rx
            .await
            .tap_err(|e| warn!("Error in current_artist: {e}"))
            .ok()
            .and_then(|state| state.current_song)
        {
            Song::read_artist(&self.db, song.id)
                .await
                .tap_err(|e| warn!("Error in current_album: {e}"))
                .ok()
                .into()
        } else {
            OneOrMany::None
        }
    }
    /// returns the current album.
    #[instrument]
    async fn current_album(self, context: Context) -> Option<Album> {
        info!("Getting current album");
        let (tx, rx) = tokio::sync::oneshot::channel();

        self.audio_kernel.send(AudioCommand::ReportStatus(tx));

        if let Some(song) = rx
            .await
            .tap_err(|e| warn!("Error in current_album: {e}"))
            .ok()
            .and_then(|state| state.current_song)
        {
            Song::read_album(&self.db, song.id)
                .await
                .tap_err(|e| warn!("Error in current_album: {e}"))
                .ok()
                .flatten()
        } else {
            None
        }
    }
    /// returns the current song.
    #[instrument]
    async fn current_song(self, context: Context) -> Option<Song> {
        info!("Getting current song");
        let (tx, rx) = tokio::sync::oneshot::channel();

        self.audio_kernel.send(AudioCommand::ReportStatus(tx));

        rx.await
            .tap_err(|e| warn!("Error in current_song: {e}"))
            .ok()
            .and_then(|state| state.current_song)
    }

    /// returns a random artist.
    #[instrument]
    async fn rand_artist(self, context: Context) -> Option<Artist> {
        info!("Getting random artist");
        Artist::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in rand_artist: {e}"))
            .ok()
            .and_then(|artists| artists.choose(&mut rand::thread_rng()).cloned())
    }
    /// returns a random album.
    #[instrument]
    async fn rand_album(self, context: Context) -> Option<Album> {
        info!("Getting random album");
        Album::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in rand_album: {e}"))
            .ok()
            .and_then(|albums| albums.choose(&mut rand::thread_rng()).cloned())
    }
    /// returns a random song.
    #[instrument]
    async fn rand_song(self, context: Context) -> Option<Song> {
        info!("Getting random song");
        Song::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in rand_song: {e}"))
            .ok()
            .and_then(|songs| songs.choose(&mut rand::thread_rng()).cloned())
    }

    /// returns a list of artists, albums, and songs matching the given search query.
    #[instrument]
    #[allow(clippy::type_complexity)]
    async fn search(self, context: Context, query: String, limit: u32) -> SearchResult {
        info!("Searching for: {query}");
        // basic idea:
        // 1. search for songs
        // 2. search for albums
        // 3. search for artists
        // 4. return the results
        let songs = Song::search(&self.db, &query, i64::from(limit))
            .await
            .tap_err(|e| warn!("Error in search: {e}"))
            .unwrap_or_default()
            .into();

        let albums = Album::search(&self.db, &query, i64::from(limit))
            .await
            .tap_err(|e| warn!("Error in search: {e}"))
            .unwrap_or_default()
            .into();

        let artists = Artist::search(&self.db, &query, i64::from(limit))
            .await
            .tap_err(|e| warn!("Error in search: {e}"))
            .unwrap_or_default()
            .into();
        SearchResult {
            songs,
            albums,
            artists,
        }
    }
    /// returns a list of artists matching the given search query.
    #[instrument]
    async fn search_artist(self, context: Context, query: String, limit: u32) -> Box<[Artist]> {
        info!("Searching for artist: {query}");
        Artist::search(&self.db, &query, i64::from(limit))
            .await
            .tap_err(|e| {
                warn!("Error in search_artist: {e}");
            })
            .unwrap_or_default()
            .into()
    }
    /// returns a list of albums matching the given search query.
    #[instrument]
    async fn search_album(self, context: Context, query: String, limit: u32) -> Box<[Album]> {
        info!("Searching for album: {query}");
        Album::search(&self.db, &query, i64::from(limit))
            .await
            .tap_err(|e| {
                warn!("Error in search_album: {e}");
            })
            .unwrap_or_default()
            .into()
    }
    /// returns a list of songs matching the given search query.
    #[instrument]
    async fn search_song(self, context: Context, query: String, limit: u32) -> Box<[Song]> {
        info!("Searching for song: {query}");
        Song::search(&self.db, &query, i64::from(limit))
            .await
            .tap_err(|e| {
                warn!("Error in search_song: {e}");
            })
            .unwrap_or_default()
            .into()
    }

    /// toggles playback (play/pause).
    #[instrument]
    async fn playback_toggle(self, context: Context) {
        info!("Toggling playback");
        self.audio_kernel.send(AudioCommand::TogglePlayback);
    }
    /// start playback (unpause).
    #[instrument]
    async fn playback_play(self, context: Context) {
        info!("Starting playback");
        self.audio_kernel.send(AudioCommand::Play);
    }
    /// pause playback.
    #[instrument]
    async fn playback_pause(self, context: Context) {
        info!("Pausing playback");
        self.audio_kernel.send(AudioCommand::Pause);
    }
    /// stop playback.
    #[instrument]
    async fn playback_stop(self, context: Context) {
        info!("Stopping playback");
        self.audio_kernel.send(AudioCommand::Stop);
    }
    /// restart the current song.
    #[instrument]
    async fn playback_restart(self, context: Context) {
        info!("Restarting current song");
        self.audio_kernel.send(AudioCommand::RestartSong);
    }
    /// skip forward by the given amount of songs
    #[instrument]
    async fn playback_skip_forward(self, context: Context, amount: usize) {
        info!("Skipping forward by {amount} songs");
        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::SkipForward(amount)));
    }
    /// go backwards by the given amount of songs.
    #[instrument]
    async fn playback_skip_backward(self, context: Context, amount: usize) {
        info!("Going back by {amount} songs");
        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::SkipBackward(amount)));
    }
    /// stop playback.
    /// (clears the queue and stops playback)
    #[instrument]
    async fn playback_clear_player(self, context: Context) {
        info!("Stopping playback");
        self.audio_kernel.send(AudioCommand::ClearPlayer);
    }
    /// clear the queue.
    #[instrument]
    async fn playback_clear(self, context: Context) {
        info!("Clearing queue and stopping playback");
        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::Clear));
    }
    /// seek forwards, backwards, or to an absolute second in the current song.
    #[instrument]
    async fn playback_seek(self, context: Context, seek: SeekType, duration: Duration) {
        info!("Seeking {seek} by {:.2}s", duration.as_secs_f32());
        self.audio_kernel.send(AudioCommand::Seek(seek, duration));
    }
    /// set the repeat mode.
    #[instrument]
    async fn playback_repeat(self, context: Context, mode: RepeatMode) {
        info!("Setting repeat mode to: {}", mode);
        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::SetRepeatMode(mode)));
    }
    /// Shuffle the current queue, then start playing from the 1st Song in the queue.
    #[instrument]
    async fn playback_shuffle(self, context: Context) {
        info!("Shuffling queue");
        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::Shuffle));
    }
    /// set the volume to the given value
    /// The value `1.0` is the "normal" volume (unfiltered input). Any value other than `1.0` will multiply each sample by this value.
    #[instrument]
    async fn playback_volume(self, context: Context, volume: f32) {
        info!("Setting volume to: {volume}",);
        self.audio_kernel
            .send(AudioCommand::Volume(VolumeCommand::Set(volume)));
    }
    /// increase the volume by the given amount
    #[instrument]
    async fn playback_volume_up(self, context: Context, amount: f32) {
        info!("Increasing volume by: {amount}",);
        self.audio_kernel
            .send(AudioCommand::Volume(VolumeCommand::Up(amount)));
    }
    /// decrease the volume by the given amount
    #[instrument]
    async fn playback_volume_down(self, context: Context, amount: f32) {
        info!("Decreasing volume by: {amount}",);
        self.audio_kernel
            .send(AudioCommand::Volume(VolumeCommand::Down(amount)));
    }
    /// toggle the volume mute.
    #[instrument]
    async fn playback_volume_toggle_mute(self, context: Context) {
        info!("Toggling volume mute");
        self.audio_kernel
            .send(AudioCommand::Volume(VolumeCommand::ToggleMute));
    }
    /// mute the volume.
    #[instrument]
    async fn playback_mute(self, context: Context) {
        info!("Muting volume");
        self.audio_kernel
            .send(AudioCommand::Volume(VolumeCommand::Mute));
    }
    /// unmute the volume.
    #[instrument]
    async fn playback_unmute(self, context: Context) {
        info!("Unmuting volume");
        self.audio_kernel
            .send(AudioCommand::Volume(VolumeCommand::Unmute));
    }

    /// add a song to the queue.
    /// (if the queue is empty, it will start playing the song.)
    #[instrument]
    async fn queue_add(
        self,
        context: Context,
        thing: schemas::Thing,
    ) -> Result<(), SerializableLibraryError> {
        info!("Adding thing to queue: {thing}");

        let songs = get_songs_from_things(&self.db, &[thing]).await?;

        if songs.is_empty() {
            return Err(Error::NotFound.into());
        }

        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::AddToQueue(Box::new(
                songs,
            ))));

        Ok(())
    }
    /// add a list of things to the queue.
    /// (if the queue is empty, it will start playing the first thing in the list.)
    #[instrument]
    async fn queue_add_list(
        self,
        context: Context,
        list: Vec<schemas::Thing>,
    ) -> Result<(), SerializableLibraryError> {
        info!(
            "Adding list to queue: ({})",
            list.iter()
                .map(ToString::to_string)
                .collect::<Vec<_>>()
                .join(", ")
        );

        // go through the list, and get songs for each thing (depending on what it is)
        let songs: OneOrMany<Song> = get_songs_from_things(&self.db, &list).await?;

        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::AddToQueue(Box::new(
                songs,
            ))));

        Ok(())
    }
    /// set the current song to a queue index.
    /// if the index is out of bounds, it will be clamped to the nearest valid index.
    #[instrument]
    async fn queue_set_index(self, context: Context, index: usize) {
        info!("Setting queue index to: {index}");

        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::SetPosition(index)));
    }
    /// remove a range of songs from the queue.
    /// if the range is out of bounds, it will be clamped to the nearest valid range.
    #[instrument]
    async fn queue_remove_range(self, context: Context, range: Range<usize>) {
        info!("Removing queue range: {range:?}");

        self.audio_kernel
            .send(AudioCommand::Queue(QueueCommand::RemoveRange(range)));
    }

    /// Returns brief information about the users playlists.
    #[instrument]
    async fn playlist_list(self, context: Context) -> Box<[PlaylistBrief]> {
        info!("Listing playlists");
        Playlist::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in playlist_list: {e}"))
            .ok()
            .map(|playlists| playlists.iter().map(std::convert::Into::into).collect())
            .unwrap_or_default()
    }
    /// create a new playlist.
    /// if a playlist with the same name already exists, this will return that playlist's id in the error variant
    #[instrument]
    async fn playlist_get_or_create(
        self,
        context: Context,
        name: String,
    ) -> Result<PlaylistId, SerializableLibraryError> {
        info!("Creating new playlist: {name}");

        // see if a playlist with that name already exists
        match Playlist::read_by_name(&self.db, name.clone()).await {
            Ok(Some(playlist)) => return Ok(playlist.id.into()),
            Err(e) => warn!("Error in playlist_new (looking for existing playlist): {e}"),
            _ => {}
        }
        // if it doesn't, create a new playlist with that name
        match Playlist::create(
            &self.db,
            Playlist {
                id: Playlist::generate_id(),
                name: name.into(),
                runtime: Duration::from_secs(0),
                song_count: 0,
            },
        )
        .await
        .tap_err(|e| warn!("Error in playlist_new (creating new playlist): {e}"))?
        {
            Some(playlist) => Ok(playlist.id.into()),
            None => Err(Error::NotCreated.into()),
        }
    }
    /// remove a playlist.
    #[instrument]
    async fn playlist_remove(
        self,
        context: Context,
        id: PlaylistId,
    ) -> Result<(), SerializableLibraryError> {
        let id = id.into();
        info!("Removing playlist with id: {id}");

        Playlist::delete(&self.db, id)
            .await?
            .ok_or(Error::NotFound)?;

        Ok(())
    }
    /// clone a playlist.
    /// (creates a new playlist with the same name (append " (copy)") and contents as the given playlist.)
    /// returns the id of the new playlist
    #[instrument]
    async fn playlist_clone(
        self,
        context: Context,
        id: PlaylistId,
    ) -> Result<PlaylistId, SerializableLibraryError> {
        let id = id.into();
        info!("Cloning playlist with id: {id}");

        let new_playlist = Playlist::create_copy(&self.db, id)
            .await?
            .ok_or(Error::NotFound)?;

        Ok(new_playlist.id.into())
    }
    /// get the id of a playlist.
    /// returns none if the playlist does not exist.
    #[instrument]
    async fn playlist_get_id(self, context: Context, name: String) -> Option<PlaylistId> {
        info!("Getting playlist ID: {name}");

        Playlist::read_by_name(&self.db, name)
            .await
            .tap_err(|e| warn!("Error in playlist_get_id: {e}"))
            .ok()
            .flatten()
            .map(|playlist| playlist.id.into())
    }
    /// remove a list of songs from a playlist.
    /// if the songs are not in the playlist, this will do nothing.
    #[instrument]
    async fn playlist_remove_songs(
        self,
        context: Context,
        playlist: PlaylistId,
        songs: Vec<SongId>,
    ) -> Result<(), SerializableLibraryError> {
        let playlist = playlist.into();
        let songs = songs.into_iter().map(Into::into).collect::<Vec<_>>();
        info!("Removing song from playlist: {playlist} ({songs:?})");

        Ok(Playlist::remove_songs(&self.db, playlist, songs).await?)
    }
    /// Add a thing to a playlist.
    /// If the thing is something that has songs (an album, artist, etc.), it will add all the songs.
    #[instrument]
    async fn playlist_add(
        self,
        context: Context,
        playlist: PlaylistId,
        thing: schemas::Thing,
    ) -> Result<(), SerializableLibraryError> {
        let playlist = playlist.into();
        info!("Adding thing to playlist: {playlist} ({thing})");

        // get songs for the thing
        let songs: OneOrMany<Song> = get_songs_from_things(&self.db, &[thing]).await?;

        Ok(Playlist::add_songs(
            &self.db,
            playlist,
            songs.into_iter().map(|s| s.id).collect::<Vec<_>>(),
        )
        .await?)
    }
    /// Add a list of things to a playlist.
    /// If the things are something that have songs (an album, artist, etc.), it will add all the songs.
    #[instrument]
    async fn playlist_add_list(
        self,
        context: Context,
        playlist: PlaylistId,
        list: Vec<schemas::Thing>,
    ) -> Result<(), SerializableLibraryError> {
        let playlist = playlist.into();
        info!(
            "Adding list to playlist: {playlist} ({})",
            list.iter()
                .map(ToString::to_string)
                .collect::<Vec<_>>()
                .join(", ")
        );

        // go through the list, and get songs for each thing (depending on what it is)
        let songs: OneOrMany<Song> = get_songs_from_things(&self.db, &list).await?;

        Ok(Playlist::add_songs(
            &self.db,
            playlist,
            songs.into_iter().map(|s| s.id).collect::<Vec<_>>(),
        )
        .await?)
    }
    /// Get a playlist by its ID.
    #[instrument]
    async fn playlist_get(self, context: Context, id: PlaylistId) -> Option<Playlist> {
        let id = id.into();
        info!("Getting playlist by ID: {}", id);

        Playlist::read(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in playlist_get: {e}"))
            .ok()
            .flatten()
    }
    /// Get the songs of a playlist
    #[instrument]
    async fn playlist_get_songs(self, context: Context, id: PlaylistId) -> Option<Box<[Song]>> {
        let id = id.into();
        info!("Getting songs in: {id}");
        Playlist::read_songs(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in playlist_get_songs: {e}"))
            .ok()
            .map(Into::into)
    }
    /// Rename a playlist.
    #[instrument]
    async fn playlist_rename(
        self,
        context: Context,
        id: PlaylistId,
        name: String,
    ) -> Result<Playlist, SerializableLibraryError> {
        let id = id.into();
        info!("Renaming playlist: {id} ({name})");
        Playlist::update(&self.db, id, PlaylistChangeSet::new().name(name))
            .await?
            .ok_or(Error::NotFound.into())
    }

    /// Collections: Return brief information about the users auto curration collections.
    #[instrument]
    async fn collection_list(self, context: Context) -> Box<[CollectionBrief]> {
        info!("Listing collections");
        Collection::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in collection_list: {e}"))
            .ok()
            .map(|collections| collections.iter().map(std::convert::Into::into).collect())
            .unwrap_or_default()
    }
    /// Collections: get a collection by its ID.
    #[instrument]
    async fn collection_get(self, context: Context, id: CollectionId) -> Option<Collection> {
        info!("Getting collection by ID: {id:?}");
        Collection::read(&self.db, id.into())
            .await
            .tap_err(|e| warn!("Error in collection_get: {e}"))
            .ok()
            .flatten()
    }
    /// Collections: freeze a collection (convert it to a playlist).
    #[instrument]
    async fn collection_freeze(
        self,
        context: Context,
        id: CollectionId,
        name: String,
    ) -> Result<PlaylistId, SerializableLibraryError> {
        info!("Freezing collection: {id:?} ({name})");
        Ok(Collection::freeze(&self.db, id.into(), name.into())
            .await
            .map(|p| p.id.into())?)
    }
    /// Get the songs of a collection
    #[instrument]
    async fn collection_get_songs(self, context: Context, id: CollectionId) -> Option<Box<[Song]>> {
        let id = id.into();
        info!("Getting songs in: {id}");
        Collection::read_songs(&self.db, id)
            .await
            .tap_err(|e| warn!("Error in collection_get_songs: {e}"))
            .ok()
            .map(Into::into)
    }

    /// Radio: get the `n` most similar songs to the given things.
    #[instrument]
    async fn radio_get_similar(
        self,
        context: Context,
        things: Vec<schemas::Thing>,
        n: u32,
    ) -> Result<Box<[Song]>, SerializableLibraryError> {
        #[cfg(not(feature = "analysis"))]
        {
            warn!("Analysis is not enabled");
            return Err(SerializableLibraryError::AnalysisNotEnabled);
        }

        #[cfg(feature = "analysis")]
        {
            info!("Getting the {n} most similar songs to: {things:?}");
            Ok(services::radio::get_similar(&self.db, things, n)
                .await
                .map(Vec::into_boxed_slice)
                .tap_err(|e| warn!("Error in radio_get_similar: {e}"))?)
        }
    }
    /// Radio: get the ids of the `n` most similar songs to the given things.
    #[instrument]
    async fn radio_get_similar_ids(
        self,
        context: Context,
        things: Vec<schemas::Thing>,
        n: u32,
    ) -> Result<Box<[SongId]>, SerializableLibraryError> {
        #[cfg(not(feature = "analysis"))]
        {
            warn!("Analysis is not enabled");
            return Err(SerializableLibraryError::AnalysisNotEnabled);
        }

        #[cfg(feature = "analysis")]
        {
            info!("Getting the {n} most similar songs to: {things:?}");
            Ok(services::radio::get_similar(&self.db, things, n)
                .await
                .map(|songs| songs.into_iter().map(|song| song.id.into()).collect())
                .tap_err(|e| warn!("Error in radio_get_similar_songs: {e}"))?)
        }
    }

    // Dynamic playlist commands
    /// Dynamic Playlists: create a new DP with the given name and query
    #[instrument]
    async fn dynamic_playlist_create(
        self,
        context: Context,
        name: String,
        query: Query,
    ) -> Result<DynamicPlaylistId, SerializableLibraryError> {
        let id = DynamicPlaylist::generate_id();
        info!("Creating new DP: {id:?} ({name})");

        match DynamicPlaylist::create(
            &self.db,
            DynamicPlaylist {
                id,
                name: name.into(),
                query,
            },
        )
        .await
        .tap_err(|e| warn!("Error in dynamic_playlist_create: {e}"))?
        {
            Some(dp) => Ok(dp.id.into()),
            None => Err(Error::NotCreated.into()),
        }
    }
    /// Dynamic Playlists: list all DPs
    #[instrument]
    async fn dynamic_playlist_list(self, context: Context) -> Box<[DynamicPlaylist]> {
        info!("Listing DPs");
        DynamicPlaylist::read_all(&self.db)
            .await
            .tap_err(|e| warn!("Error in dynamic_playlist_list: {e}"))
            .ok()
            .map(Into::into)
            .unwrap_or_default()
    }
    /// Dynamic Playlists: update a DP
    #[instrument]
    async fn dynamic_playlist_update(
        self,
        context: Context,
        id: DynamicPlaylistId,
        changes: DynamicPlaylistChangeSet,
    ) -> Result<DynamicPlaylist, SerializableLibraryError> {
        info!("Updating DP: {id:?}, {changes:?}");
        DynamicPlaylist::update(&self.db, id.into(), changes)
            .await
            .tap_err(|e| warn!("Error in dynamic_playlist_update: {e}"))?
            .ok_or(Error::NotFound.into())
    }
    /// Dynamic Playlists: remove a DP
    #[instrument]
    async fn dynamic_playlist_remove(
        self,
        context: Context,
        id: DynamicPlaylistId,
    ) -> Result<(), SerializableLibraryError> {
        info!("Removing DP with id: {id:?}");
        DynamicPlaylist::delete(&self.db, id.into())
            .await?
            .ok_or(Error::NotFound)?;
        Ok(())
    }
    /// Dynamic Playlists: get a DP by its ID
    #[instrument]
    async fn dynamic_playlist_get(
        self,
        context: Context,
        id: DynamicPlaylistId,
    ) -> Option<DynamicPlaylist> {
        info!("Getting DP by ID: {id:?}");
        DynamicPlaylist::read(&self.db, id.into())
            .await
            .tap_err(|e| warn!("Error in dynamic_playlist_get: {e}"))
            .ok()
            .flatten()
    }
    /// Dynamic Playlists: get the songs of a DP
    #[instrument]
    async fn dynamic_playlist_get_songs(
        self,
        context: Context,
        id: DynamicPlaylistId,
    ) -> Option<Box<[Song]>> {
        info!("Getting songs in DP: {id:?}");
        DynamicPlaylist::run_query_by_id(&self.db, id.into())
            .await
            .tap_err(|e| warn!("Error in dynamic_playlist_get_songs: {e}"))
            .ok()
            .flatten()
            .map(Into::into)
    }
}