//! Music library: SQLite-backed albums and tracks. All methods are
//! synchronous — call from a blocking context.

use rusqlite::Connection;
use serde::Serialize;
use std::path::Path;
use std::sync::Mutex;

#[derive(Debug, thiserror::Error)]
pub enum LibraryError {
    #[error("sqlite: {0}")]
    Sqlite(#[from] rusqlite::Error),
}

pub type Result<T> = std::result::Result<T, LibraryError>;

#[derive(Debug, Clone, Serialize)]
pub struct Album {
    pub id: i64,
    pub artist: String,
    pub title: String,
    pub year: Option<u32>,
    pub art_path: Option<String>,
    pub artist_art_path: Option<String>,
    pub track_count: u32,
    pub added_at: i64,
}

#[derive(Debug, Clone, Serialize)]
pub struct Track {
    pub id: i64,
    pub album_id: i64,
    pub track_no: Option<u32>,
    pub title: String,
    pub artist: String,
    pub duration_secs: Option<u32>,
    pub bitrate_kbps: Option<u32>,
    pub sample_rate: Option<u32>,
    pub bit_depth: Option<u32>,
    pub size: Option<u64>,
    pub path: String,
}

#[derive(Debug, Clone, Serialize)]
pub struct Playlist {
    pub id: i64,
    pub name: String,
    pub track_count: u32,
}

#[derive(Debug, Clone, Serialize)]
pub struct PlaylistTrack {
    pub position: i64,
    pub title: String,
    pub artist: String,
    pub duration_secs: Option<u32>,
    pub path: String,
    pub art_path: Option<String>,
}

/// Cumulative listening stats for one artist (drives the artist-page chips).
#[derive(Debug, Clone, Serialize)]
pub struct PlayStats {
    pub seconds: u64,
    pub last_played_at: Option<i64>,
    /// Most played track, ranked by listened time (not session count, so ten
    /// instant skips never beat one album's worth of real listening).
    pub top_title: Option<String>,
    /// Listening sessions of the top track — the "N×" the chip displays.
    pub top_count: u32,
}

pub struct Library {
    conn: Mutex<Connection>,
}

impl Library {
    pub fn open(db_path: &Path) -> Result<Library> {
        let conn = Connection::open(db_path)?;
        conn.execute_batch(
            "
            PRAGMA journal_mode = WAL;
            CREATE TABLE IF NOT EXISTS albums (
                id INTEGER PRIMARY KEY,
                artist TEXT NOT NULL,
                title TEXT NOT NULL,
                year INTEGER,
                art_path TEXT,
                artist_art_path TEXT,
                mbid TEXT,
                added_at INTEGER NOT NULL,
                UNIQUE(artist COLLATE NOCASE, title COLLATE NOCASE)
            );
            CREATE TABLE IF NOT EXISTS tracks (
                id INTEGER PRIMARY KEY,
                album_id INTEGER NOT NULL REFERENCES albums(id) ON DELETE CASCADE,
                track_no INTEGER,
                title TEXT NOT NULL,
                artist TEXT NOT NULL,
                duration_secs INTEGER,
                bitrate_kbps INTEGER,
                sample_rate INTEGER,
                bit_depth INTEGER,
                size INTEGER,
                path TEXT NOT NULL UNIQUE,
                added_at INTEGER NOT NULL
            );
            CREATE INDEX IF NOT EXISTS idx_tracks_album ON tracks(album_id);
            CREATE TABLE IF NOT EXISTS playlists (
                id INTEGER PRIMARY KEY,
                name TEXT NOT NULL,
                created_at INTEGER NOT NULL
            );
            CREATE TABLE IF NOT EXISTS playlist_tracks (
                playlist_id INTEGER NOT NULL REFERENCES playlists(id) ON DELETE CASCADE,
                position INTEGER NOT NULL,
                title TEXT NOT NULL,
                artist TEXT NOT NULL,
                duration_secs INTEGER,
                path TEXT NOT NULL,
                art_path TEXT,
                PRIMARY KEY (playlist_id, position)
            );
            CREATE TABLE IF NOT EXISTS plays (
                id INTEGER PRIMARY KEY,
                artist TEXT NOT NULL,
                title TEXT NOT NULL,
                started_at INTEGER NOT NULL,
                seconds INTEGER NOT NULL DEFAULT 0
            );
            CREATE INDEX IF NOT EXISTS idx_plays_artist ON plays(artist COLLATE NOCASE);
            ",
        )?;
        // Migrate databases created before artist portraits were added.
        let _ = conn.execute("ALTER TABLE albums ADD COLUMN artist_art_path TEXT", []);
        // Migrate databases created before per-track audio props were stored.
        let _ = conn.execute("ALTER TABLE tracks ADD COLUMN sample_rate INTEGER", []);
        let _ = conn.execute("ALTER TABLE tracks ADD COLUMN bit_depth INTEGER", []);
        let _ = conn.execute("ALTER TABLE tracks ADD COLUMN size INTEGER", []);
        Ok(Library {
            conn: Mutex::new(conn),
        })
    }

    /// Insert or fetch the album, updating year/art/mbid when newly known.
    pub fn upsert_album(
        &self,
        artist: &str,
        title: &str,
        year: Option<u32>,
        art_path: Option<&str>,
        artist_art_path: Option<&str>,
        mbid: Option<&str>,
        now: i64,
    ) -> Result<i64> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "INSERT INTO albums (artist, title, year, art_path, artist_art_path, mbid, added_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)
             ON CONFLICT(artist COLLATE NOCASE, title COLLATE NOCASE) DO UPDATE SET
                year = COALESCE(albums.year, excluded.year),
                art_path = COALESCE(albums.art_path, excluded.art_path),
                artist_art_path = COALESCE(albums.artist_art_path, excluded.artist_art_path),
                mbid = COALESCE(albums.mbid, excluded.mbid)",
            rusqlite::params![artist, title, year, art_path, artist_art_path, mbid, now],
        )?;
        let id = conn.query_row(
            "SELECT id FROM albums WHERE artist = ?1 COLLATE NOCASE AND title = ?2 COLLATE NOCASE",
            rusqlite::params![artist, title],
            |r| r.get(0),
        )?;
        Ok(id)
    }

    pub fn set_album_art(&self, album_id: i64, art_path: &str) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "UPDATE albums SET art_path = ?2 WHERE id = ?1",
            rusqlite::params![album_id, art_path],
        )?;
        Ok(())
    }

    pub fn set_artist_art(&self, artist: &str, art_path: &str) -> Result<usize> {
        let conn = self.conn.lock().unwrap();
        Ok(conn.execute(
            "UPDATE albums SET artist_art_path = ?2 WHERE artist = ?1 COLLATE NOCASE",
            rusqlite::params![artist, art_path],
        )?)
    }

    // ---- play history ----
    // One row per listening session. The frontend opens a row when a track
    // first accumulates listened time and tops up its seconds while it plays,
    // so a skipped track never writes a row and per-play counts stay honest.

    pub fn record_play(&self, artist: &str, title: &str, now: i64) -> Result<i64> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "INSERT INTO plays (artist, title, started_at, seconds) VALUES (?1, ?2, ?3, 0)",
            rusqlite::params![artist, title, now],
        )?;
        Ok(conn.last_insert_rowid())
    }

    pub fn add_play_seconds(&self, play_id: i64, secs: u32) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "UPDATE plays SET seconds = seconds + ?2 WHERE id = ?1",
            rusqlite::params![play_id, secs],
        )?;
        Ok(())
    }

    pub fn artist_play_stats(&self, artist: &str) -> Result<PlayStats> {
        let conn = self.conn.lock().unwrap();
        let (seconds, last_played_at) = conn.query_row(
            "SELECT COALESCE(SUM(seconds), 0), MAX(started_at)
             FROM plays WHERE artist = ?1 COLLATE NOCASE",
            rusqlite::params![artist],
            |r| Ok((r.get::<_, i64>(0)?.max(0) as u64, r.get(1)?)),
        )?;
        // Sessions shorter than 30s are noise (previews, near-instant skips);
        // excluding them keeps the count aligned with the scrobbling norm.
        let top = conn
            .query_row(
                "SELECT title, COUNT(*) FROM plays
                 WHERE artist = ?1 COLLATE NOCASE AND seconds >= 30
                 GROUP BY title COLLATE NOCASE
                 ORDER BY SUM(seconds) DESC LIMIT 1",
                rusqlite::params![artist],
                |r| Ok((r.get::<_, String>(0)?, r.get::<_, i64>(1)?.max(0) as u32)),
            )
            .map(Some)
            .or_else(|e| match e {
                rusqlite::Error::QueryReturnedNoRows => Ok(None),
                other => Err(other),
            })?;
        let (top_title, top_count) = top.map_or((None, 0), |(t, c)| (Some(t), c));
        Ok(PlayStats {
            seconds,
            last_played_at,
            top_title,
            top_count,
        })
    }

    #[allow(clippy::too_many_arguments)]
    pub fn upsert_track(
        &self,
        album_id: i64,
        track_no: Option<u32>,
        title: &str,
        artist: &str,
        duration_secs: Option<u32>,
        bitrate_kbps: Option<u32>,
        sample_rate: Option<u32>,
        bit_depth: Option<u32>,
        size: Option<u64>,
        path: &str,
        now: i64,
    ) -> Result<i64> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "INSERT INTO tracks (album_id, track_no, title, artist, duration_secs, bitrate_kbps, sample_rate, bit_depth, size, path, added_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11)
             ON CONFLICT(path) DO UPDATE SET
                album_id = excluded.album_id,
                track_no = excluded.track_no,
                title = excluded.title,
                artist = excluded.artist,
                duration_secs = excluded.duration_secs,
                bitrate_kbps = excluded.bitrate_kbps,
                sample_rate = excluded.sample_rate,
                bit_depth = excluded.bit_depth,
                size = excluded.size",
            rusqlite::params![album_id, track_no, title, artist, duration_secs, bitrate_kbps, sample_rate, bit_depth, size, path, now],
        )?;
        let id = conn.query_row(
            "SELECT id FROM tracks WHERE path = ?1",
            rusqlite::params![path],
            |r| r.get(0),
        )?;
        Ok(id)
    }

    pub fn has_track_path(&self, path: &str) -> Result<bool> {
        let conn = self.conn.lock().unwrap();
        let n: i64 = conn.query_row(
            "SELECT COUNT(*) FROM tracks WHERE path = ?1",
            rusqlite::params![path],
            |r| r.get(0),
        )?;
        Ok(n > 0)
    }

    /// Whether this song is already represented in the library, independent
    /// of its on-disk path. Downloads are organized with a " (2)" suffix to
    /// avoid overwriting files, so a path-only check cannot prevent a second
    /// save of the same track from becoming a duplicate library row.
    pub fn has_track(&self, artist: &str, album: &str, title: &str) -> Result<bool> {
        let conn = self.conn.lock().unwrap();
        let n: i64 = conn.query_row(
            "SELECT COUNT(*)
             FROM tracks t
             JOIN albums a ON a.id = t.album_id
             WHERE a.artist = ?1 COLLATE NOCASE
               AND a.title = ?2 COLLATE NOCASE
               AND t.title = ?3 COLLATE NOCASE",
            rusqlite::params![artist, album, title],
            |r| r.get(0),
        )?;
        Ok(n > 0)
    }

    pub fn get_album(&self, album_id: i64) -> Result<Option<(Album, Option<String>)>> {
        let conn = self.conn.lock().unwrap();
        let row = conn
            .query_row(
                "SELECT a.id, a.artist, a.title, a.year, a.art_path, a.artist_art_path, a.added_at, a.mbid,
                        (SELECT COUNT(*) FROM tracks t WHERE t.album_id = a.id)
                 FROM albums a WHERE a.id = ?1",
                [album_id],
                |r| {
                    Ok((
                        Album {
                            id: r.get(0)?,
                            artist: r.get(1)?,
                            title: r.get(2)?,
                            year: r.get(3)?,
                            art_path: r.get(4)?,
                            artist_art_path: r.get(5)?,
                            added_at: r.get(6)?,
                            track_count: r.get::<_, i64>(8)? as u32,
                        },
                        r.get::<_, Option<String>>(7)?,
                    ))
                },
            )
            .map(Some)
            .or_else(|e| match e {
                rusqlite::Error::QueryReturnedNoRows => Ok(None),
                other => Err(other),
            })?;
        Ok(row)
    }

    pub fn list_albums(&self) -> Result<Vec<Album>> {
        let conn = self.conn.lock().unwrap();
        let mut stmt = conn.prepare(
            "SELECT a.id, a.artist, a.title, a.year, a.art_path, a.artist_art_path, a.added_at,
                    (SELECT COUNT(*) FROM tracks t WHERE t.album_id = a.id)
             FROM albums a
             ORDER BY a.added_at DESC, a.artist, a.title",
        )?;
        let rows = stmt.query_map([], |r| {
            Ok(Album {
                id: r.get(0)?,
                artist: r.get(1)?,
                title: r.get(2)?,
                year: r.get(3)?,
                art_path: r.get(4)?,
                artist_art_path: r.get(5)?,
                added_at: r.get(6)?,
                track_count: r.get::<_, i64>(7)? as u32,
            })
        })?;
        Ok(rows.filter_map(|r| r.ok()).collect())
    }

    pub fn album_tracks(&self, album_id: i64) -> Result<Vec<Track>> {
        let conn = self.conn.lock().unwrap();
        let mut stmt = conn.prepare(
            "SELECT id, album_id, track_no, title, artist, duration_secs, bitrate_kbps, sample_rate, bit_depth, size, path
             FROM tracks WHERE album_id = ?1
             ORDER BY track_no IS NULL, track_no, title",
        )?;
        let rows = stmt.query_map([album_id], |r| {
            Ok(Track {
                id: r.get(0)?,
                album_id: r.get(1)?,
                track_no: r.get(2)?,
                title: r.get(3)?,
                artist: r.get(4)?,
                duration_secs: r.get(5)?,
                bitrate_kbps: r.get(6)?,
                sample_rate: r.get(7)?,
                bit_depth: r.get(8)?,
                size: r.get::<_, Option<i64>>(9)?.map(|n| n as u64),
                path: r.get(10)?,
            })
        })?;
        Ok(rows.filter_map(|r| r.ok()).collect())
    }

    /// Paths of tracks missing the audio-props backfill (size is the sentinel:
    /// always available from the filesystem, so a non-null size means scanned).
    pub fn tracks_missing_props(&self) -> Result<Vec<(i64, String)>> {
        let conn = self.conn.lock().unwrap();
        let mut stmt = conn.prepare("SELECT id, path FROM tracks WHERE size IS NULL")?;
        let rows = stmt.query_map([], |r| Ok((r.get(0)?, r.get(1)?)))?;
        Ok(rows.filter_map(|r| r.ok()).collect())
    }

    /// Backfill audio props for one track (found via tracks_missing_props).
    pub fn set_track_props(
        &self,
        id: i64,
        sample_rate: Option<u32>,
        bit_depth: Option<u32>,
        size: Option<u64>,
    ) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "UPDATE tracks SET sample_rate = ?2, bit_depth = ?3, size = ?4 WHERE id = ?1",
            rusqlite::params![id, sample_rate, bit_depth, size.map(|n| n as i64)],
        )?;
        Ok(())
    }

    // ---- playlists ----

    pub fn create_playlist(&self, name: &str, now: i64) -> Result<i64> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "INSERT INTO playlists (name, created_at) VALUES (?1, ?2)",
            rusqlite::params![name, now],
        )?;
        Ok(conn.last_insert_rowid())
    }

    pub fn rename_playlist(&self, id: i64, name: &str) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "UPDATE playlists SET name = ?2 WHERE id = ?1",
            rusqlite::params![id, name],
        )?;
        Ok(())
    }

    pub fn delete_playlist(&self, id: i64) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        conn.execute("DELETE FROM playlist_tracks WHERE playlist_id = ?1", [id])?;
        conn.execute("DELETE FROM playlists WHERE id = ?1", [id])?;
        Ok(())
    }

    /// (id, name, track_count), newest first.
    pub fn list_playlists(&self) -> Result<Vec<Playlist>> {
        let conn = self.conn.lock().unwrap();
        let mut stmt = conn.prepare(
            "SELECT p.id, p.name,
                    (SELECT COUNT(*) FROM playlist_tracks t WHERE t.playlist_id = p.id)
             FROM playlists p ORDER BY p.created_at DESC",
        )?;
        let rows = stmt.query_map([], |r| {
            Ok(Playlist {
                id: r.get(0)?,
                name: r.get(1)?,
                track_count: r.get::<_, i64>(2)? as u32,
            })
        })?;
        Ok(rows.filter_map(|r| r.ok()).collect())
    }

    pub fn add_to_playlist(&self, playlist_id: i64, t: &PlaylistTrack) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        let next: i64 = conn.query_row(
            "SELECT COALESCE(MAX(position), -1) + 1 FROM playlist_tracks WHERE playlist_id = ?1",
            [playlist_id],
            |r| r.get(0),
        )?;
        conn.execute(
            "INSERT INTO playlist_tracks
                (playlist_id, position, title, artist, duration_secs, path, art_path)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)",
            rusqlite::params![
                playlist_id,
                next,
                t.title,
                t.artist,
                t.duration_secs,
                t.path,
                t.art_path
            ],
        )?;
        Ok(())
    }

    pub fn playlist_tracks(&self, playlist_id: i64) -> Result<Vec<PlaylistTrack>> {
        let conn = self.conn.lock().unwrap();
        let mut stmt = conn.prepare(
            "SELECT position, title, artist, duration_secs, path, art_path
             FROM playlist_tracks WHERE playlist_id = ?1 ORDER BY position",
        )?;
        let rows = stmt.query_map([playlist_id], |r| {
            Ok(PlaylistTrack {
                position: r.get(0)?,
                title: r.get(1)?,
                artist: r.get(2)?,
                duration_secs: r.get(3)?,
                path: r.get(4)?,
                art_path: r.get(5)?,
            })
        })?;
        Ok(rows.filter_map(|r| r.ok()).collect())
    }

    pub fn remove_from_playlist(&self, playlist_id: i64, position: i64) -> Result<()> {
        let conn = self.conn.lock().unwrap();
        conn.execute(
            "DELETE FROM playlist_tracks WHERE playlist_id = ?1 AND position = ?2",
            rusqlite::params![playlist_id, position],
        )?;
        Ok(())
    }

    /// Drop tracks whose files vanished; returns how many were removed.
    pub fn prune_missing(&self) -> Result<usize> {
        let conn = self.conn.lock().unwrap();
        let paths: Vec<(i64, String)> = conn
            .prepare("SELECT id, path FROM tracks")?
            .query_map([], |r| Ok((r.get(0)?, r.get(1)?)))?
            .filter_map(|r| r.ok())
            .collect();
        let mut removed = 0;
        for (id, path) in paths {
            if !Path::new(&path).exists() {
                conn.execute("DELETE FROM tracks WHERE id = ?1", [id])?;
                removed += 1;
            }
        }
        conn.execute(
            "DELETE FROM albums WHERE id NOT IN (SELECT DISTINCT album_id FROM tracks)",
            [],
        )?;
        Ok(removed)
    }

    /// Repoint stale artwork references to an identically named file in the
    /// current app's art cache. This covers app-identifier/data-directory
    /// migrations without requiring artwork to be downloaded again.
    pub fn repair_art_paths(&self, art_dir: &Path) -> Result<usize> {
        let conn = self.conn.lock().unwrap();
        let rows: Vec<(i64, Option<String>, Option<String>)> = conn
            .prepare("SELECT id, art_path, artist_art_path FROM albums")?
            .query_map([], |r| Ok((r.get(0)?, r.get(1)?, r.get(2)?)))?
            .filter_map(|r| r.ok())
            .collect();
        let mut repaired = 0;

        for (id, art_path, artist_art_path) in rows {
            if let Some(path) = art_path.and_then(|p| cached_art_path(&p, art_dir)) {
                conn.execute(
                    "UPDATE albums SET art_path = ?2 WHERE id = ?1",
                    rusqlite::params![id, path],
                )?;
                repaired += 1;
            }
            if let Some(path) = artist_art_path.and_then(|p| cached_art_path(&p, art_dir)) {
                conn.execute(
                    "UPDATE albums SET artist_art_path = ?2 WHERE id = ?1",
                    rusqlite::params![id, path],
                )?;
                repaired += 1;
            }
        }
        Ok(repaired)
    }

    /// Remove rows accidentally created for non-audio download extras (cover
    /// images, playlists, text files, etc.). The library should only ever
    /// expose playable audio tracks.
    pub fn prune_non_audio(&self) -> Result<usize> {
        let conn = self.conn.lock().unwrap();
        let rows: Vec<(i64, String)> = conn
            .prepare("SELECT id, path FROM tracks")?
            .query_map([], |r| Ok((r.get(0)?, r.get(1)?)))?
            .filter_map(|r| r.ok())
            .collect();
        let mut removed = 0;
        for (id, path) in rows {
            let audio = Path::new(&path)
                .extension()
                .and_then(|e| e.to_str())
                .map(|e| {
                    matches!(
                        e.to_ascii_lowercase().as_str(),
                        "flac" | "mp3" | "m4a" | "ogg" | "opus" | "wav" | "aac" | "wma"
                    )
                })
                .unwrap_or(false);
            if !audio {
                conn.execute("DELETE FROM tracks WHERE id = ?1", [id])?;
                removed += 1;
            }
        }
        conn.execute(
            "DELETE FROM albums WHERE id NOT IN (SELECT DISTINCT album_id FROM tracks)",
            [],
        )?;
        Ok(removed)
    }
}

fn cached_art_path(path: &str, art_dir: &Path) -> Option<String> {
    if Path::new(path).is_file() {
        return None;
    }
    let name = Path::new(path).file_name()?;
    let candidate = art_dir.join(name);
    candidate
        .is_file()
        .then(|| candidate.to_string_lossy().into_owned())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn roundtrip() {
        let dir = std::env::temp_dir().join("ssplus-lib-test");
        std::fs::create_dir_all(&dir).unwrap();
        let db = dir.join("t.db");
        let _ = std::fs::remove_file(&db);

        let lib = Library::open(&db).unwrap();
        let album = lib
            .upsert_album(
                "Radiohead",
                "OK Computer",
                Some(1997),
                None,
                None,
                None,
                100,
            )
            .unwrap();
        // Same album, case-insensitive → same id, art fills in.
        let again = lib
            .upsert_album(
                "radiohead",
                "ok computer",
                None,
                Some("art.jpg"),
                None,
                None,
                200,
            )
            .unwrap();
        assert_eq!(album, again);

        lib.upsert_track(
            album,
            Some(1),
            "Airbag",
            "Radiohead",
            Some(287),
            Some(1024),
            Some(44100),
            Some(16),
            Some(30_000_000),
            "C:\\x\\01.flac",
            100,
        )
        .unwrap();
        lib.upsert_track(
            album,
            Some(2),
            "Paranoid Android",
            "Radiohead",
            None,
            None,
            None,
            None,
            None,
            "C:\\x\\02.flac",
            100,
        )
        .unwrap();

        let albums = lib.list_albums().unwrap();
        assert_eq!(albums.len(), 1);
        assert_eq!(albums[0].track_count, 2);
        assert_eq!(albums[0].art_path.as_deref(), Some("art.jpg"));

        let tracks = lib.album_tracks(album).unwrap();
        assert_eq!(tracks[0].title, "Airbag");
        assert!(lib.has_track_path("C:\\x\\01.flac").unwrap());
        assert!(lib.has_track("radiohead", "ok computer", "airbag").unwrap());
        assert!(!lib
            .has_track("Radiohead", "OK Computer", "Karma Police")
            .unwrap());

        let art_dir = dir.join("art");
        std::fs::create_dir_all(&art_dir).unwrap();
        let cover = art_dir.join("cover.jpg");
        let artist = art_dir.join("artist.jpg");
        std::fs::write(&cover, []).unwrap();
        std::fs::write(&artist, []).unwrap();
        let stale = lib
            .upsert_album(
                "Stale Artist",
                "Stale Album",
                None,
                Some("C:\\old-app-data\\art\\cover.jpg"),
                Some("C:\\old-app-data\\art\\artist.jpg"),
                None,
                100,
            )
            .unwrap();
        assert_eq!(lib.repair_art_paths(&art_dir).unwrap(), 2);
        let repaired = lib.get_album(stale).unwrap().unwrap().0;
        assert_eq!(
            repaired.art_path.as_deref(),
            Some(cover.to_string_lossy().as_ref())
        );
        assert_eq!(
            repaired.artist_art_path.as_deref(),
            Some(artist.to_string_lossy().as_ref())
        );
    }
}