// Mirrors the server helper in src/worker/auth/index.ts so rows with a
// null `preferredUsername` display the same slug the OIDC claim emits.
// When the column is set, it wins on both sides. Shared by the account
// hub and /account/profile.
export const fallbackHandle = (u: { name?: string | null; email: string }): string => {
  const slug = (s: string) =>
    s
      .toLowerCase()
      .normalize("NFKD")
      .replace(/[^a-z0-9]+/g, "-")
      .replace(/^-+|-+$/g, "");
  if (u.name?.trim()) {
    const fromName = slug(u.name);
    if (fromName) return fromName;
  }
  return slug(u.email.split("@")[0] ?? "") || "user";
};