/**
 * Maps raw digest / upstream errors to clear admin-lab messages (not shown to subscribers).
 */
export function classifyDigestAdminError(raw: string): string {
  const s = raw.toLowerCase();
  if (/429|rate limit|too many requests/.test(s)) {
    return "Groq rate limit hit — try later or check quota and DIGEST_SCORE_DELAY_MS.";
  }
  if (
    /resend/i.test(raw) ||
    /RESEND_API_KEY/i.test(raw) ||
    (s.includes("resend") && /missing|401|403|invalid/i.test(s))
  ) {
    return "Resend API key missing or invalid — check RESEND_API_KEY and sender domain.";
  }
  if (/SERPER|serper/i.test(raw) || s.includes("missing serper")) {
    return "Serper search API not configured — set SERPER_API_KEY.";
  }
  if (/groq|GROQ_API_KEY|openrouter|OPENROUTER/i.test(raw) && /key|401|403|missing/i.test(s)) {
    return "Scoring API key missing or rejected — check GROQ_API_KEY / OPENROUTER_API_KEY on the deployment.";
  }
  if (/insufficient credits/i.test(s)) {
    return "Insufficient credits for this user to run a paid digest.";
  }
  if (/no listings|no matches|passed threshold|passed today/i.test(s)) {
    return raw;
  }
  return raw;
}

export type DiscoveryFailureKind = "config" | "quota" | "timeout" | "scoring" | "unknown";

/** Classify discovery tool errors for digest handling and user messaging. */
export function classifyDiscoveryFailure(error: string): DiscoveryFailureKind {
  const s = error.toLowerCase();
  if (
    /temporarily unavailable|serper|not configured|missing serper/i.test(s) ||
    /job discovery is temporarily unavailable/i.test(s)
  ) {
    return "config";
  }
  if (/monthly_limit_reached|monthly limit|insufficient credits/i.test(s)) {
    return "quota";
  }
  if (/timed out|timeout/i.test(s)) {
    return "timeout";
  }
  if (/scoring|score failed|couldn't score/i.test(s)) {
    return "scoring";
  }
  return "unknown";
}