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