/// Maps a legacy prefixed resource id (e.g. "deezer:123") to its provider id,
/// or null when the value carries no known provider prefix.
String? legacyProviderIdFromResourceId(String value) {
  if (value.startsWith('deezer:')) return 'deezer';
  if (value.startsWith('qobuz:')) return 'qobuz';
  if (value.startsWith('tidal:')) return 'tidal';
  if (value.startsWith('spotify:')) return 'spotify';
  return null;
}

/// Strips a leading "provider:" prefix from a resource id, if present.
String stripPrefixedResourceId(String value) {
  final colonIndex = value.indexOf(':');
  if (colonIndex <= 0 || colonIndex == value.length - 1) {
    return value;
  }
  return value.substring(colonIndex + 1);
}