feat: add db cleanup command line argument

Tools/Cli.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore;
 using Shadow.Data;
 using Shadow.Entities;
 
@@ -8,7 +9,8 @@ public class Cli
 	private readonly GeneralUseHelpers guhf;
 	private readonly string[] args;
 
-	// TODO: Add "changeUser", "fullRescan", "destructiveRescan"
+	// TODO: Add "changeUser", "fullRescan", "destructiveRescan", "healthcheck"
+	// TODO: Make this async
 
 	public Cli(ApplicationDbContext _db, GeneralUseHelpers _guhf, string[] _args)
 	{
@@ -65,6 +67,15 @@ public class Cli
 				if (!Seeder.EnsureMigrations(db)) return true;
 				SetupWizard();
 				break;
+			case "clear":
+			case "cleanup":
+			case "cleardb":
+			case "cleanupdb":
+			case "--clear":
+			case "--cleanup":
+				if (!Seeder.EnsureMigrations(db)) return true;
+				CleanUpDb();
+				break;
 			default:
 				Console.WriteLine($"Unknown option: \"{args[0]}\". See \"help\" for available arguments.");
 				break;
@@ -88,9 +99,10 @@ public class Cli
 			$"- removeUser [username] - remove the user COMPLETELY.\n" +
 			$"\n" +
 			$"=== Server maintenance ===\n" +
-			$"- setupWizard - configure library and thumbnail location on disk.\n" +
+			$"- setupWizard - configure library and thumbnail location on disk,\n" +
+			$"- cleanup - cleanup database from orphaned songs/albums/artists.\n" +
 			$"\n" +
-			$"Username is optional. If not provided, user will be prompted to enter it.\n" +
+			$"[field] means the field is optional. If not provided, user will be prompted to enter it.\n" +
 			$"Running without specifying a command launches a Kestrel web server.\n" +
 			$"\n" +
 			$"License: AGPLv3+, Source code: https://gitea.7o7.cx/sherl/Shadow"
@@ -281,6 +293,8 @@ public class Cli
 			"         - Shadow's image thumbnails path, used to provide cover art extracted from media.\n" +
 			"         Finally, you will be asked if you want your changes saved.\n");
 
+		// TODO: do a healthcheck here
+
 		Global? musicLibraryPath   = db.Globals.FirstOrDefault(g => g.Key == "musicLibraryPath");
 		Global? musicThumbnailPath = db.Globals.FirstOrDefault(g => g.Key == "musicThumbnailPath");
 
@@ -299,7 +313,7 @@ public class Cli
 			Console.WriteLine("         No existing configuration found.\n");
 		}
 
-			string newMusicLibraryPath = DefaultPrompt("Please enter your new music library path", musicLibraryPath?.Value).TrimEnd(['\\', '/']);
+		string newMusicLibraryPath   = DefaultPrompt("Please enter your new music library path", musicLibraryPath?.Value).TrimEnd(['\\', '/']);
 		string newMusicThumbnailPath = DefaultPrompt("Please enter your new image thumbnail path", musicThumbnailPath?.Value ?? Path.Combine(newMusicLibraryPath, ".shadow")).TrimEnd(['\\', '/']);
 
 		bool confirmed = YesNoPrompt("Are you sure you want:\n" +
@@ -322,6 +336,9 @@ public class Cli
 			musicLibraryPath.Value   = newMusicLibraryPath;
 			musicThumbnailPath.Value = newMusicThumbnailPath;
 
+			System.IO.Directory.CreateDirectory(newMusicLibraryPath);
+			System.IO.Directory.CreateDirectory(newMusicThumbnailPath);
+
 			// UpdateRange can both Add and Update rows.
 			db.Globals.UpdateRange(musicLibraryPath, musicThumbnailPath);
 			db.SaveChanges();
@@ -338,6 +355,93 @@ public class Cli
 		return success;
 	}
 
+	public void CleanUpDb()
+	{
+		// Ask user here whether he/she wants to
+		// clear the DB from dangling records (orphaned songs/albums/artists).
+		int rowsAffected = 0;
+
+		// Retrieve orphaned songs
+		List<Song> orphanedSongs = db.Songs.Where(s => s.State == 1).ToList();
+
+		// Ask if it's alright to remove them
+		// and related listening data permanently
+		if (orphanedSongs.Count != 0)
+		{
+			bool songConsent = false;
+			songConsent = YesNoPrompt($"Found {orphanedSongs.Count} orphaned songs. Remove them? [y/N]: ", false);
+			if (songConsent)
+			{
+				foreach (Song s in orphanedSongs)
+				{
+					// Remove song interactions
+					List<SongInteraction> interactions = db.SongInteractions.Where(si => si.Song == s).ToList();
+					db.SongInteractions.RemoveRange(interactions);
+
+					// Remove song from playlists
+					List<PlaylistSong> playlists = db.PlaylistSongs.Where(ps => ps.Song == s).ToList();
+					db.PlaylistSongs.RemoveRange(playlists);
+
+					// Remove song from albums
+					Album album = s.Album;
+					album.Songs.Remove(s);
+
+					if (album.Songs.Count == 0) album.State = 1; // Set album state to orphaned.
+
+					// TODO: Remove song images if not used by any other resource
+					// ...
+				}
+
+				// Perform cleanup with stored procedure
+				rowsAffected += db.Database.ExecuteSqlRaw("CALL song_cleanup()");
+				// rowsAffected += songs.Count;
+			}
+		}
+		else Console.WriteLine("No orphaned songs found.");
+
+		// Rinse and repeat
+		// Retrieve orphaned albums
+		List<Album> orphanedAlbums = db.Albums.Where(a => a.State == 1).ToList();
+
+		if (orphanedAlbums.Count != 0)
+		{
+			bool albumConsent = false;
+			albumConsent = YesNoPrompt($"Found {orphanedAlbums.Count} orphaned albums. Remove them? [y/N]: ", false);
+			if (albumConsent)
+			{
+				db.Albums.RemoveRange(orphanedAlbums);
+				rowsAffected += orphanedAlbums.Count;
+			}
+		}
+		else Console.WriteLine("No orphaned albums found.");
+
+		// Retrieve orphaned artists (artists with no songs AND albums)
+		List<Artist> orphanedArtists = db.Artists.Where(a => a.Songs.Count == 0 && a.Albums.Count == 0).ToList();
+		Artist? unknownArtist = db.Artists.FirstOrDefault(a => a.NormalizedName == "[unknown artist]");
+
+		// Account for the [Unknown Artist],
+		// which is a meta-artist and shall
+		// not be slated for removal.
+		// Can be null only if this command
+		// is ran before seeding.
+		if (unknownArtist != null) orphanedArtists.Remove(unknownArtist);
+
+		if (orphanedArtists.Count != 0)
+		{
+			bool artistConsent = false;
+			artistConsent = YesNoPrompt($"Found {orphanedArtists.Count} orphaned artists. Remove them? [y/N]: ", false);
+			if (artistConsent)
+			{
+				db.Artists.RemoveRange(orphanedArtists);
+				rowsAffected += orphanedArtists.Count;
+			}
+		}
+		else Console.WriteLine("No orphaned artists found.");
+
+		Console.WriteLine($"{rowsAffected} entries affected.");
+		db.SaveChanges();
+	}
+
 	public static string ReadPassword(string prompt = "         Enter password (will not be echoed back): ")
 	{
 		// https://www.silicloud.com/blog/how-to-hide-content-in-the-console-using-c/