feat: improve metadata implementation for track

lib/utils.go

@@ -10,19 +10,18 @@ type UrlType int
 const (
 	UrlTypeTrack UrlType = iota
 	UrlTypePlaylist
-	UrlTypeInvalid
 )
 
-func ParseUrlType(url string) UrlType {
+func ParseUrlType(url string) (UrlType, error) {
 	if strings.Contains(url, "https://open.spotify.com/track") {
-		return UrlTypeTrack
+		return UrlTypeTrack, nil
 	}
 
 	if strings.Contains(url, "https://open.spotify.com/playlist") {
-		return UrlTypePlaylist
+		return UrlTypePlaylist, nil
 	}
 
-	return UrlTypeInvalid
+	return UrlTypeTrack, errors.New("Invalid URL, not a playlist nor a track.")
 }
 
 func ParseTrackId(url string) (string, error) {