拆分LibraryRepository

internal/repository/album_repo.go

@@ -0,0 +1,125 @@
+package repository
+
+import (
+	"butterfliu/internal/model"
+	"database/sql"
+)
+
+type AlbumRepository struct {
+	db *sql.DB
+}
+
+func NewAlbumRepository(db *sql.DB) *AlbumRepository {
+	return &AlbumRepository{db: db}
+}
+
+func (r *AlbumRepository) Get(id int) (model.Album, error) {
+	row := r.db.QueryRow("SELECT id, title, artist_id FROM albums WHERE id = ?", id)
+	var album model.Album
+	if err := row.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
+		return model.Album{}, err
+	}
+	return album, nil
+}
+
+func (r *AlbumRepository) GetByTitleAndArtist(title string, artistID int) (model.Album, error) {
+	row := r.db.QueryRow(`
+		SELECT id, title, artist_id, COALESCE(cover, ''), COALESCE(year, 0)
+		FROM albums WHERE title = ? AND artist_id = ?
+	`)
+	var album model.Album
+	if err := row.Scan(&album.ID, &album.Title, &album.ArtistID, &album.Cover, &album.Year); err != nil {
+		return model.Album{}, err
+	}
+	return album, nil
+}
+
+func (r *AlbumRepository) Create(title string, artistID int) (model.Album, error) {
+	result, err := r.db.Exec("INSERT INTO albums (title, artist_id) VALUES (?, ?)", title, artistID)
+	if err != nil {
+		return model.Album{}, err
+	}
+
+	id, err := result.LastInsertId()
+	if err != nil {
+		return model.Album{}, err
+	}
+
+	return model.Album{
+		ID:       int(id),
+		Title:    title,
+		ArtistID: artistID,
+	}, nil
+}
+
+func (r *AlbumRepository) GetAll() ([]model.Album, error) {
+	rows, err := r.db.Query("SELECT id, title, artist_id FROM albums")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	albums := []model.Album{}
+	for rows.Next() {
+		var album model.Album
+		if err := rows.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
+			return nil, err
+		}
+		albums = append(albums, album)
+	}
+	return albums, nil
+}
+
+func (r *AlbumRepository) GetByArtist(artistID int) ([]model.Album, error) {
+	rows, err := r.db.Query("SELECT id, title, artist_id FROM albums WHERE artist_id = ?", artistID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	albums := []model.Album{}
+	for rows.Next() {
+		var album model.Album
+		if err := rows.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
+			return nil, err
+		}
+		albums = append(albums, album)
+	}
+	return albums, nil
+}
+
+func (r *AlbumRepository) GetIDsByArtist(artistID int) ([]int, error) {
+	rows, err := r.db.Query("SELECT id FROM albums WHERE artist_id = ?", artistID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	ids := []int{}
+	for rows.Next() {
+		var id int
+		if err := rows.Scan(&id); err != nil {
+			return nil, err
+		}
+		ids = append(ids, id)
+	}
+	return ids, nil
+}
+
+func (r *AlbumRepository) GetSongIDs(albumID int) ([]int, error) {
+	rows, err := r.db.Query("SELECT id FROM songs WHERE album_id = ?", albumID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	ids := []int{}
+	for rows.Next() {
+		var id int
+		if err := rows.Scan(&id); err != nil {
+			return nil, err
+		}
+		ids = append(ids, id)
+	}
+	return ids, nil
+}

internal/repository/artist_repo.go

@@ -0,0 +1,85 @@
+package repository
+
+import (
+	"butterfliu/internal/model"
+	"database/sql"
+)
+
+type ArtistRepository struct {
+	db *sql.DB
+}
+
+func NewArtistRepository(db *sql.DB) *ArtistRepository {
+	return &ArtistRepository{db: db}
+}
+
+func (r *ArtistRepository) Get(id int) (model.Artist, error) {
+	row := r.db.QueryRow("SELECT id, name FROM artists WHERE id = ?", id)
+	var artist model.Artist
+	if err := row.Scan(&artist.ID, &artist.Name); err != nil {
+		return model.Artist{}, err
+	}
+	return artist, nil
+}
+
+func (r *ArtistRepository) GetByName(name string) (model.Artist, error) {
+	row := r.db.QueryRow("SELECT id, name FROM artists WHERE name = ?", name)
+	var artist model.Artist
+	if err := row.Scan(&artist.ID, &artist.Name); err != nil {
+		return model.Artist{}, err
+	}
+	return artist, nil
+}
+
+func (r *ArtistRepository) Create(name string) (model.Artist, error) {
+	result, err := r.db.Exec("INSERT INTO artists (name) VALUES (?)", name)
+	if err != nil {
+		return model.Artist{}, err
+	}
+
+	id, err := result.LastInsertId()
+	if err != nil {
+		return model.Artist{}, err
+	}
+
+	return model.Artist{
+		ID:   int(id),
+		Name: name,
+	}, nil
+}
+
+func (r *ArtistRepository) GetAll() ([]model.Artist, error) {
+	rows, err := r.db.Query("SELECT id, name FROM artists")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	artists := []model.Artist{}
+	for rows.Next() {
+		var artist model.Artist
+		if err := rows.Scan(&artist.ID, &artist.Name); err != nil {
+			return nil, err
+		}
+		artists = append(artists, artist)
+	}
+	return artists, nil
+}
+
+func (r *ArtistRepository) GetSongIDsByArtist(artistID int) ([]int, error) {
+	rows, err := r.db.Query("SELECT id FROM songs WHERE artist_id = ?", artistID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	ids := []int{}
+	for rows.Next() {
+		var id int
+		if err := rows.Scan(&id); err != nil {
+			return nil, err
+		}
+		ids = append(ids, id)
+	}
+	return ids, nil
+}

internal/repository/library.go

@@ -5,11 +5,6 @@ import (
 	"database/sql"
 )
 
-// SongDetail is a DTO for API responses with joined artist/album names.
-// Kept here temporarily for backward compatibility with service layer.
-// Consider moving to model package in future refactoring.
-type SongDetail = model.SongDetail
-
 type LibraryRepository struct {
 	db *sql.DB
 }
@@ -19,7 +14,7 @@ func NewLibraryRepository(db *sql.DB) *LibraryRepository {
 }
 
 func (r *LibraryRepository) GetAll() ([]model.Library, error) {
-	rows, err := r.db.Query("SELECT id, name, path, created_at,updated_at FROM libraries")
+	rows, err := r.db.Query("SELECT id, name, path, created_at, updated_at FROM libraries")
 	if err != nil {
 		return nil, err
 	}
@@ -111,329 +106,3 @@ func (r *LibraryRepository) Delete(id int) error {
 
 	return tx.Commit()
 }
-
-func (r *LibraryRepository) GetSongsByLibraryWithDetails(libraryID int) ([]SongDetail, error) {
-	rows, err := r.db.Query(`
-		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
-		FROM songs s
-		INNER JOIN media_files mf ON s.media_file_id = mf.id
-		INNER JOIN artists a ON s.artist_id = a.id
-		INNER JOIN albums al ON s.album_id = al.id
-		WHERE mf.library_id = ?
-		ORDER BY s.title
-	`, libraryID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	songs := []SongDetail{}
-	for rows.Next() {
-		var song SongDetail
-		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
-			return nil, err
-		}
-		songs = append(songs, song)
-	}
-	return songs, nil
-}
-
-func (r *LibraryRepository) GetSongsByArtistWithDetails(artistID int) ([]SongDetail, error) {
-	rows, err := r.db.Query(`
-		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
-		FROM songs s
-		INNER JOIN media_files mf ON s.media_file_id = mf.id
-		INNER JOIN artists a ON s.artist_id = a.id
-		INNER JOIN albums al ON s.album_id = al.id
-		WHERE s.artist_id = ?
-		ORDER BY s.title
-	`, artistID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	songs := []SongDetail{}
-	for rows.Next() {
-		var song SongDetail
-		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
-			return nil, err
-		}
-		songs = append(songs, song)
-	}
-	return songs, nil
-}
-
-func (r *LibraryRepository) GetSongsByAlbumWithDetails(albumID int) ([]SongDetail, error) {
-	rows, err := r.db.Query(`
-		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
-		FROM songs s
-		INNER JOIN media_files mf ON s.media_file_id = mf.id
-		INNER JOIN artists a ON s.artist_id = a.id
-		INNER JOIN albums al ON s.album_id = al.id
-		WHERE s.album_id = ?
-		ORDER BY s.title
-	`, albumID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	songs := []SongDetail{}
-	for rows.Next() {
-		var song SongDetail
-		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
-			return nil, err
-		}
-		songs = append(songs, song)
-	}
-	return songs, nil
-}
-
-func (r *LibraryRepository) GetMediaFileByPath(path string) (model.MediaFile, error) {
-	row := r.db.QueryRow(`
-		SELECT id, path, library_id, 
-		       COALESCE(file_size, 0), COALESCE(format, ''), 
-		       COALESCE(bit_rate, 0), COALESCE(sample_rate, 0),
-		       COALESCE(created_at, '1970-01-01T00:00:00Z'), 
-		       COALESCE(updated_at, '1970-01-01T00:00:00Z')
-		FROM media_files WHERE path = ?
-	`)
-	var mediaFile model.MediaFile
-	if err := row.Scan(
-		&mediaFile.ID, &mediaFile.Path, &mediaFile.LibraryID,
-		&mediaFile.FileSize, &mediaFile.Format,
-		&mediaFile.BitRate, &mediaFile.SampleRate,
-		&mediaFile.CreatedAt, &mediaFile.UpdatedAt,
-	); err != nil {
-		return model.MediaFile{}, err
-	}
-	return mediaFile, nil
-}
-
-func (r *LibraryRepository) CreateMediaFile(path string, libraryID int) (model.MediaFile, error) {
-	result, err := r.db.Exec("INSERT INTO media_files (path, library_id) VALUES (?, ?)", path, libraryID)
-	if err != nil {
-		return model.MediaFile{}, err
-	}
-
-	id, err := result.LastInsertId()
-	if err != nil {
-		return model.MediaFile{}, err
-	}
-
-	return model.MediaFile{
-		ID:        int(id),
-		Path:      path,
-		LibraryID: libraryID,
-	}, nil
-}
-
-func (r *LibraryRepository) GetArtistByName(name string) (model.Artist, error) {
-	row := r.db.QueryRow("SELECT id, name FROM artists WHERE name = ?", name)
-	var artist model.Artist
-	if err := row.Scan(&artist.ID, &artist.Name); err != nil {
-		return model.Artist{}, err
-	}
-	return artist, nil
-}
-
-func (r *LibraryRepository) CreateArtist(name string) (model.Artist, error) {
-	result, err := r.db.Exec("INSERT INTO artists (name) VALUES (?)", name)
-	if err != nil {
-		return model.Artist{}, err
-	}
-
-	id, err := result.LastInsertId()
-	if err != nil {
-		return model.Artist{}, err
-	}
-
-	return model.Artist{
-		ID:   int(id),
-		Name: name,
-	}, nil
-}
-
-func (r *LibraryRepository) GetAlbumByTitleAndArtist(title string, artistID int) (model.Album, error) {
-	row := r.db.QueryRow(`
-		SELECT id, title, artist_id, COALESCE(cover, ''), COALESCE(year, 0)
-		FROM albums WHERE title = ? AND artist_id = ?
-	`)
-	var album model.Album
-	if err := row.Scan(&album.ID, &album.Title, &album.ArtistID, &album.Cover, &album.Year); err != nil {
-		return model.Album{}, err
-	}
-	return album, nil
-}
-
-func (r *LibraryRepository) CreateAlbum(title string, artistID int) (model.Album, error) {
-	result, err := r.db.Exec("INSERT INTO albums (title, artist_id) VALUES (?, ?)", title, artistID)
-	if err != nil {
-		return model.Album{}, err
-	}
-
-	id, err := result.LastInsertId()
-	if err != nil {
-		return model.Album{}, err
-	}
-
-	return model.Album{
-		ID:       int(id),
-		Title:    title,
-		ArtistID: artistID,
-	}, nil
-}
-
-func (r *LibraryRepository) CreateSong(title string, artistID, albumID, duration, mediaFileID int) (model.Song, error) {
-	result, err := r.db.Exec(
-		"INSERT INTO songs (title, artist_id, album_id, duration, media_file_id) VALUES (?, ?, ?, ?, ?)",
-		title, artistID, albumID, duration, mediaFileID,
-	)
-	if err != nil {
-		return model.Song{}, err
-	}
-
-	id, err := result.LastInsertId()
-	if err != nil {
-		return model.Song{}, err
-	}
-
-	return model.Song{
-		ID:          int(id),
-		Title:       title,
-		ArtistID:    artistID,
-		AlbumID:     albumID,
-		Duration:    duration,
-		MediaFileID: mediaFileID,
-	}, nil
-}
-
-func (r *LibraryRepository) GetArtists() ([]model.Artist, error) {
-	rows, err := r.db.Query("SELECT id, name FROM artists")
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	artists := []model.Artist{}
-	for rows.Next() {
-		var artist model.Artist
-		if err := rows.Scan(&artist.ID, &artist.Name); err != nil {
-			return nil, err
-		}
-		artists = append(artists, artist)
-	}
-	return artists, nil
-}
-
-func (r *LibraryRepository) GetArtist(id int) (model.Artist, error) {
-	row := r.db.QueryRow("SELECT id, name FROM artists WHERE id = ?", id)
-
-	var artist model.Artist
-	if err := row.Scan(&artist.ID, &artist.Name); err != nil {
-		return model.Artist{}, err
-	}
-
-	return artist, nil
-}
-
-func (r *LibraryRepository) GetAlbums() ([]model.Album, error) {
-	rows, err := r.db.Query("SELECT id, title, artist_id FROM albums")
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	albums := []model.Album{}
-	for rows.Next() {
-		var album model.Album
-		if err := rows.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
-			return nil, err
-		}
-		albums = append(albums, album)
-	}
-	return albums, nil
-}
-
-func (r *LibraryRepository) GetAlbumsByArtist(artistID int) ([]model.Album, error) {
-	rows, err := r.db.Query("SELECT id, title, artist_id FROM albums WHERE artist_id = ?", artistID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	albums := []model.Album{}
-	for rows.Next() {
-		var album model.Album
-		if err := rows.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
-			return nil, err
-		}
-		albums = append(albums, album)
-	}
-	return albums, nil
-}
-
-func (r *LibraryRepository) GetAlbumIDsByArtist(artistID int) ([]int, error) {
-	rows, err := r.db.Query("SELECT id FROM albums WHERE artist_id = ?", artistID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	ids := []int{}
-	for rows.Next() {
-		var id int
-		if err := rows.Scan(&id); err != nil {
-			return nil, err
-		}
-		ids = append(ids, id)
-	}
-	return ids, nil
-}
-
-func (r *LibraryRepository) GetSongIDsByArtist(artistID int) ([]int, error) {
-	rows, err := r.db.Query("SELECT id FROM songs WHERE artist_id = ?", artistID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	ids := []int{}
-	for rows.Next() {
-		var id int
-		if err := rows.Scan(&id); err != nil {
-			return nil, err
-		}
-		ids = append(ids, id)
-	}
-	return ids, nil
-}
-
-func (r *LibraryRepository) GetAlbum(id int) (model.Album, error) {
-	row := r.db.QueryRow("SELECT id, title, artist_id FROM albums WHERE id = ?", id)
-
-	var album model.Album
-	if err := row.Scan(&album.ID, &album.Title, &album.ArtistID); err != nil {
-		return model.Album{}, err
-	}
-	return album, nil
-}
-
-func (r *LibraryRepository) GetSongIDsByAlbum(artistID int) ([]int, error) {
-	rows, err := r.db.Query("SELECT id FROM songs WHERE album_id = ?", artistID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-
-	ids := []int{}
-	for rows.Next() {
-		var id int
-		if err := rows.Scan(&id); err != nil {
-			return nil, err
-		}
-		ids = append(ids, id)
-	}
-	return ids, nil
-}

internal/repository/media_repo.go

@@ -23,3 +23,120 @@ func (r *MediaRepository) Get(id int) (model.MediaFile, error) {
 	}
 	return m, nil
 }
+
+func (r *MediaRepository) GetByPath(path string) (model.MediaFile, error) {
+	row := r.db.QueryRow(`
+		SELECT id, path, library_id,
+		       COALESCE(file_size, 0), COALESCE(format, ''),
+		       COALESCE(bit_rate, 0), COALESCE(sample_rate, 0),
+		       COALESCE(created_at, '1970-01-01T00:00:00Z'),
+		       COALESCE(updated_at, '1970-01-01T00:00:00Z')
+		FROM media_files WHERE path = ?
+	`)
+	var mediaFile model.MediaFile
+	if err := row.Scan(
+		&mediaFile.ID, &mediaFile.Path, &mediaFile.LibraryID,
+		&mediaFile.FileSize, &mediaFile.Format,
+		&mediaFile.BitRate, &mediaFile.SampleRate,
+		&mediaFile.CreatedAt, &mediaFile.UpdatedAt,
+	); err != nil {
+		return model.MediaFile{}, err
+	}
+	return mediaFile, nil
+}
+
+func (r *MediaRepository) Create(path string, libraryID int) (model.MediaFile, error) {
+	result, err := r.db.Exec("INSERT INTO media_files (path, library_id) VALUES (?, ?)", path, libraryID)
+	if err != nil {
+		return model.MediaFile{}, err
+	}
+
+	id, err := result.LastInsertId()
+	if err != nil {
+		return model.MediaFile{}, err
+	}
+
+	return model.MediaFile{
+		ID:        int(id),
+		Path:      path,
+		LibraryID: libraryID,
+	}, nil
+}
+
+func (r *MediaRepository) GetSongsByLibraryWithDetails(libraryID int) ([]model.SongDetail, error) {
+	rows, err := r.db.Query(`
+		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
+		FROM songs s
+		INNER JOIN media_files mf ON s.media_file_id = mf.id
+		INNER JOIN artists a ON s.artist_id = a.id
+		INNER JOIN albums al ON s.album_id = al.id
+		WHERE mf.library_id = ?
+		ORDER BY s.title
+	`, libraryID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	songs := []model.SongDetail{}
+	for rows.Next() {
+		var song model.SongDetail
+		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
+			return nil, err
+		}
+		songs = append(songs, song)
+	}
+	return songs, nil
+}
+
+func (r *MediaRepository) GetSongsByArtistWithDetails(artistID int) ([]model.SongDetail, error) {
+	rows, err := r.db.Query(`
+		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
+		FROM songs s
+		INNER JOIN media_files mf ON s.media_file_id = mf.id
+		INNER JOIN artists a ON s.artist_id = a.id
+		INNER JOIN albums al ON s.album_id = al.id
+		WHERE s.artist_id = ?
+		ORDER BY s.title
+	`, artistID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	songs := []model.SongDetail{}
+	for rows.Next() {
+		var song model.SongDetail
+		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
+			return nil, err
+		}
+		songs = append(songs, song)
+	}
+	return songs, nil
+}
+
+func (r *MediaRepository) GetSongsByAlbumWithDetails(albumID int) ([]model.SongDetail, error) {
+	rows, err := r.db.Query(`
+		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
+		FROM songs s
+		INNER JOIN media_files mf ON s.media_file_id = mf.id
+		INNER JOIN artists a ON s.artist_id = a.id
+		INNER JOIN albums al ON s.album_id = al.id
+		WHERE s.album_id = ?
+		ORDER BY s.title
+	`, albumID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	songs := []model.SongDetail{}
+	for rows.Next() {
+		var song model.SongDetail
+		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
+			return nil, err
+		}
+		songs = append(songs, song)
+	}
+	return songs, nil
+}

internal/repository/song_repo.go

@@ -38,7 +38,7 @@ func (r *SongRepository) GetAll() ([]model.Song, error) {
 	return songs, nil
 }
 
-func (r *SongRepository) GetAllWithDetails() ([]SongDetail, error) {
+func (r *SongRepository) GetAllWithDetails() ([]model.SongDetail, error) {
 	rows, err := r.db.Query(`
 		SELECT s.id, s.title, a.name as artist_name, al.title as album_title, s.duration, mf.path
 		FROM songs s
@@ -52,9 +52,9 @@ func (r *SongRepository) GetAllWithDetails() ([]SongDetail, error) {
 	}
 	defer rows.Close()
 
-	songs := []SongDetail{}
+	songs := []model.SongDetail{}
 	for rows.Next() {
-		var song SongDetail
+		var song model.SongDetail
 		if err := rows.Scan(&song.ID, &song.Title, &song.Artist, &song.Album, &song.Duration, &song.Path); err != nil {
 			return nil, err
 		}
@@ -94,3 +94,27 @@ func (r *SongRepository) Get(id int) (model.Song, error) {
 	}
 	return song, nil
 }
+
+func (r *SongRepository) Create(title string, artistID, albumID, duration, mediaFileID int) (model.Song, error) {
+	result, err := r.db.Exec(
+		"INSERT INTO songs (title, artist_id, album_id, duration, media_file_id) VALUES (?, ?, ?, ?, ?)",
+		title, artistID, albumID, duration, mediaFileID,
+	)
+	if err != nil {
+		return model.Song{}, err
+	}
+
+	id, err := result.LastInsertId()
+	if err != nil {
+		return model.Song{}, err
+	}
+
+	return model.Song{
+		ID:          int(id),
+		Title:       title,
+		ArtistID:    artistID,
+		AlbumID:     albumID,
+		Duration:    duration,
+		MediaFileID: mediaFileID,
+	}, nil
+}

internal/service/library.go

@@ -23,19 +23,35 @@ type ScanReport struct {
 }
 
 type LibraryService struct {
-	repo *repository.LibraryRepository
+	libRepo   *repository.LibraryRepository
+	artistRepo *repository.ArtistRepository
+	albumRepo  *repository.AlbumRepository
+	songRepo   *repository.SongRepository
+	mediaRepo  *repository.MediaRepository
 }
 
-func NewLibraryService(repo *repository.LibraryRepository) *LibraryService {
-	return &LibraryService{repo: repo}
+func NewLibraryService(
+	libRepo *repository.LibraryRepository,
+	artistRepo *repository.ArtistRepository,
+	albumRepo *repository.AlbumRepository,
+	songRepo *repository.SongRepository,
+	mediaRepo *repository.MediaRepository,
+) *LibraryService {
+	return &LibraryService{
+		libRepo:    libRepo,
+		artistRepo: artistRepo,
+		albumRepo:  albumRepo,
+		songRepo:   songRepo,
+		mediaRepo:  mediaRepo,
+	}
 }
 
 func (s *LibraryService) GetAll() ([]model.Library, error) {
-	return s.repo.GetAll()
+	return s.libRepo.GetAll()
 }
 
 func (s *LibraryService) GetByID(id int) (model.Library, error) {
-	return s.repo.GetByID(id)
+	return s.libRepo.GetByID(id)
 }
 
 func (s *LibraryService) Create(name, path string) (model.Library, error) {
@@ -45,57 +61,53 @@ func (s *LibraryService) Create(name, path string) (model.Library, error) {
 	if path = strings.TrimSpace(path); path == "" {
 		return model.Library{}, errors.New("library path cannot be empty")
 	}
-	return s.repo.Create(name, path)
+	return s.libRepo.Create(name, path)
 }
 
 func (s *LibraryService) UpdateName(id int, name string) error {
 	if name = strings.TrimSpace(name); name == "" {
 		return errors.New("library name cannot be empty")
 	}
-	return s.repo.UpdateName(id, name)
+	return s.libRepo.UpdateName(id, name)
 }
 
 func (s *LibraryService) UpdatePath(id int, path string) error {
 	if path = strings.TrimSpace(path); path == "" {
 		return errors.New("library path cannot be empty")
 	}
-	return s.repo.UpdatePath(id, path)
+	return s.libRepo.UpdatePath(id, path)
 }
 
 func (s *LibraryService) Delete(id int) error {
-	return s.repo.Delete(id)
+	return s.libRepo.Delete(id)
 }
 
-func (s *LibraryService) GetSongs(id int) ([]repository.SongDetail, error) {
-	return s.repo.GetSongsByLibraryWithDetails(id)
+func (s *LibraryService) GetSongs(id int) ([]model.SongDetail, error) {
+	return s.mediaRepo.GetSongsByLibraryWithDetails(id)
 }
 
-func (s *LibraryService) GetSongsByArtist(id int) ([]repository.SongDetail, error) {
-	return s.repo.GetSongsByArtistWithDetails(id)
+func (s *LibraryService) GetSongsByArtist(id int) ([]model.SongDetail, error) {
+	return s.mediaRepo.GetSongsByArtistWithDetails(id)
 }
 
-func (s *LibraryService) GetSongsByAlbum(id int) ([]repository.SongDetail, error) {
-	return s.repo.GetSongsByAlbumWithDetails(id)
-}
-
-func (s *LibraryService) GetSongIDsByAlbum(id int) ([]repository.SongDetail, error) {
-	return s.repo.GetSongsByAlbumWithDetails(id)
+func (s *LibraryService) GetSongsByAlbum(id int) ([]model.SongDetail, error) {
+	return s.mediaRepo.GetSongsByAlbumWithDetails(id)
 }
 
 func (s *LibraryService) GetArtists() ([]model.Artist, error) {
-	return s.repo.GetArtists()
+	return s.artistRepo.GetAll()
 }
 
 func (s *LibraryService) GetArtist(id int) (model.ArtistDetail, error) {
-	artist, err := s.repo.GetArtist(id)
+	artist, err := s.artistRepo.Get(id)
 	if err != nil {
 		return model.ArtistDetail{}, err
 	}
-	albums, err := s.repo.GetAlbumIDsByArtist(id)
+	albums, err := s.albumRepo.GetIDsByArtist(id)
 	if err != nil {
 		return model.ArtistDetail{}, err
 	}
-	songs, err := s.repo.GetSongIDsByArtist(id)
+	songs, err := s.artistRepo.GetSongIDsByArtist(id)
 	if err != nil {
 		return model.ArtistDetail{}, err
 	}
@@ -108,21 +120,21 @@ func (s *LibraryService) GetArtist(id int) (model.ArtistDetail, error) {
 }
 
 func (s *LibraryService) GetAlbums() ([]model.Album, error) {
-	return s.repo.GetAlbums()
+	return s.albumRepo.GetAll()
 }
 
 func (s *LibraryService) GetAlbumsByArtistWithDetail(artistID int) ([]model.AlbumDetail, error) {
-	albums, err := s.repo.GetAlbumsByArtist(artistID)
+	albums, err := s.albumRepo.GetByArtist(artistID)
 	if err != nil {
 		return nil, err
 	}
 	details := []model.AlbumDetail{}
 	for _, a := range albums {
-		songs, err := s.repo.GetSongIDsByAlbum(a.ID)
+		songs, err := s.albumRepo.GetSongIDs(a.ID)
 		if err != nil {
 			break
 		}
-		artist, err := s.repo.GetArtist(artistID)
+		artist, err := s.artistRepo.Get(artistID)
 		if err != nil {
 			break
 		}
@@ -137,15 +149,15 @@ func (s *LibraryService) GetAlbumsByArtistWithDetail(artistID int) ([]model.Albu
 }
 
 func (s *LibraryService) GetAlbum(id int) (model.AlbumDetail, error) {
-	album, err := s.repo.GetAlbum(id)
+	album, err := s.albumRepo.Get(id)
 	if err != nil {
 		return model.AlbumDetail{}, err
 	}
-	songs, err := s.repo.GetSongIDsByAlbum(id)
+	songs, err := s.albumRepo.GetSongIDs(id)
 	if err != nil {
 		return model.AlbumDetail{}, err
 	}
-	artist, err := s.repo.GetArtist(album.ArtistID)
+	artist, err := s.artistRepo.Get(album.ArtistID)
 	if err != nil {
 		return model.AlbumDetail{}, err
 	}
@@ -158,16 +170,19 @@ func (s *LibraryService) GetAlbum(id int) (model.AlbumDetail, error) {
 }
 
 func (s *LibraryService) GetAlbumCover(id int) (string, error) {
-	songs, err := s.repo.GetSongIDsByAlbum(id)
+	songs, err := s.albumRepo.GetSongIDs(id)
 	if err != nil {
 		return "", err
 	}
+	if len(songs) == 0 {
+		return "", errors.New("no songs found for album")
+	}
 	conf := config.LoadConfig()
 	return path.Join(conf.GetCachePath("cover"), strconv.Itoa(songs[0])+".jpg"), nil
 }
 
 func (s *LibraryService) Scan(id int) (*ScanReport, error) {
-	lib, err := s.repo.GetByID(id)
+	lib, err := s.libRepo.GetByID(id)
 	if err != nil {
 		return nil, fmt.Errorf("library %d not found: %w", id, err)
 	}
@@ -207,7 +222,7 @@ func (s *LibraryService) addScannedSong(song scanner.ScannedSong, libraryID int,
 		return fmt.Errorf("album: %w", err)
 	}
 
-	if _, err := s.repo.CreateSong(song.Title, artist.ID, album.ID, song.Duration, mediaFile.ID); err != nil {
+	if _, err := s.songRepo.Create(song.Title, artist.ID, album.ID, song.Duration, mediaFile.ID); err != nil {
 		return fmt.Errorf("song: %w", err)
 	}
 
@@ -216,25 +231,25 @@ func (s *LibraryService) addScannedSong(song scanner.ScannedSong, libraryID int,
 }
 
 func (s *LibraryService) getOrCreateMediaFile(path string, libraryID int) (model.MediaFile, error) {
-	mf, err := s.repo.GetMediaFileByPath(path)
+	mf, err := s.mediaRepo.GetByPath(path)
 	if err == nil {
 		return mf, nil
 	}
-	return s.repo.CreateMediaFile(path, libraryID)
+	return s.mediaRepo.Create(path, libraryID)
 }
 
 func (s *LibraryService) getOrCreateArtist(name string) (model.Artist, error) {
-	a, err := s.repo.GetArtistByName(name)
+	a, err := s.artistRepo.GetByName(name)
 	if err == nil {
 		return a, nil
 	}
-	return s.repo.CreateArtist(name)
+	return s.artistRepo.Create(name)
 }
 
 func (s *LibraryService) getOrCreateAlbum(title string, artistID int) (model.Album, error) {
-	al, err := s.repo.GetAlbumByTitleAndArtist(title, artistID)
+	al, err := s.albumRepo.GetByTitleAndArtist(title, artistID)
 	if err == nil {
 		return al, nil
 	}
-	return s.repo.CreateAlbum(title, artistID)
+	return s.albumRepo.Create(title, artistID)
 }

internal/service/song_svc.go

@@ -21,11 +21,11 @@ func NewSongService(songRepo *repository.SongRepository, mediaRepo *repository.M
 	}
 }
 
-func (s *SongService) GetAllWithDetails() ([]repository.SongDetail, error) {
+func (s *SongService) GetAllWithDetails() ([]model.SongDetail, error) {
 	return s.songRepo.GetAllWithDetails()
 }
 
-func (s *SongService) GetByIDWithDetails(id int) (repository.SongDetail, error) {
+func (s *SongService) GetByIDWithDetails(id int) (model.SongDetail, error) {
 	return s.songRepo.GetWithDetails(id)
 }
 

main.go

@@ -23,9 +23,11 @@ func main() {
 	r.Use(middleware.Logger)
 
 	libraryRepo := repository.NewLibraryRepository(GetDB())
+	artistRepo := repository.NewArtistRepository(GetDB())
+	albumRepo := repository.NewAlbumRepository(GetDB())
 	songRepo := repository.NewSongRepository(GetDB())
 	mediaRepo := repository.NewMediaRepository(GetDB())
-	libraryService := service.NewLibraryService(libraryRepo)
+	libraryService := service.NewLibraryService(libraryRepo, artistRepo, albumRepo, songRepo, mediaRepo)
 	songService := service.NewSongService(songRepo, mediaRepo)
 	libraryController := controller.NewLibraryController(libraryService)
 	songController := controller.NewSongController(songService)