import 'dart:math';

/// 生成与 web 前端一致的 UUID v4 字符串。
///
/// 模板：`xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx`
String generateUuid() {
  final random = Random.secure();
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replaceAllMapped(
    RegExp('[xy]'),
    (match) {
      final r = random.nextInt(16);
      final c = match.group(0)!;
      final v = c == 'x' ? r : (r & 0x3) | 0x8;
      return v.toRadixString(16);
    },
  );
}