pickBestName function

String pickBestName({ required Map<String, String> txtMap, String? fallback, String? location, String? serviceName, })

Implementation

String pickBestName({
  required Map<String, String> txtMap,
  String? fallback,
  String? location,
  String? serviceName,
}) {
  // 1. 先嘗試從 location pattern 取名
  if (location != null) {
    final raopIdx = location.indexOf('._raop._tcp.local');
    final airplayIdx = location.indexOf('._airplay._tcp.local');
    if (raopIdx > 0 || airplayIdx > 0) {
      final endIdx = raopIdx > 0 ? raopIdx : airplayIdx;
      final atIdx = location.lastIndexOf('@', endIdx);
      if (atIdx >= 0 && endIdx > atIdx) {
        final name = location.substring(atIdx + 1, endIdx);
        if (name.trim().isNotEmpty) return name.trim();
      } else if (endIdx > 0) {
        // 沒有 @，直接取前綴
        final name = location.substring(0, endIdx);
        if (name.trim().isNotEmpty) return name.trim();
      }
    }
  }
  // 2. 其他 TXT 欄位
  final candidates = [
    txtMap['fn'],
    txtMap['friendlyName'],
    txtMap['cn'],
    txtMap['am'],
    txtMap['model'],
    txtMap['md'],
  ];
  for (final c in candidates) {
    if (c != null && c.trim().isNotEmpty && !_isMeaninglessName(c)) {
      return c.trim();
    }
  }
  // 3. fallback: 若 location 有 @，取 @ 後方
  if (location != null) {
    if (location.contains('@')) {
      final idx = location.indexOf('@');
      final afterAt = location.substring(idx + 1);
      if (afterAt.trim().isNotEmpty) return afterAt.trim();
    } else {
      return location.trim();
    }
  }
  // 4. fallback: serviceName
  if (serviceName != null && serviceName.trim().isNotEmpty) {
    return serviceName.trim();
  }
  // 5. fallback: 傳入 fallback
  return fallback ?? 'Unknown';
}