export const BASELINE_MATURITY = Object.freeze({
  COLD: 'cold',
  WEAK: 'weak',
  STABLE: 'stable',
});

export function resolveBaselineMaturity(sampleCount) {
  const n = Number(sampleCount ?? 0);
  if (!Number.isFinite(n) || n < 7) return BASELINE_MATURITY.COLD;
  if (n < 30) return BASELINE_MATURITY.WEAK;
  return BASELINE_MATURITY.STABLE;
}

export function allowedEventSeverities(maturity) {
  if (maturity === BASELINE_MATURITY.STABLE) return ['info', 'watch', 'alert'];
  if (maturity === BASELINE_MATURITY.WEAK) return ['info'];
  return [];
}

export function canEmitHealthEvent(maturity, severity) {
  return allowedEventSeverities(maturity).includes(String(severity ?? ''));
}

export function isValidObservationForBaseline(row = {}) {
  const qualityFlag = row.quality_flag ?? row.qualityFlag ?? 'ok';
  const deletedAt = row.deleted_at ?? row.deletedAt ?? null;
  return qualityFlag !== 'suspect' && deletedAt == null;
}