export function normalizeUnitToken(unit) {
  const s = String(unit || "").trim().toLowerCase();
  if (s === "g" || s === "kg" || s === "gramos" || s === "kilo" || s === "kilos") return "kg";
  if (s === "unit" || s === "unidad" || s === "unidades" || s === "u") return "unit";
  return null;
}

export function computeAllowedOrderUnits({ sell_unit, raw_override } = {}) {
  if (normalizeUnitToken(sell_unit) === "unit") return ["unit"];

  if (Array.isArray(raw_override) && raw_override.length > 0) {
    const filtered = [...new Set(raw_override.map(normalizeUnitToken).filter((u) => u !== null))];
    if (filtered.length > 0) return filtered;
  }
  return ["kg", "unit"];
}

export function isUnitAllowed(unit, allowed) {
  const normalized = normalizeUnitToken(unit);
  if (normalized === null) return false;
  const list = Array.isArray(allowed) ? allowed : [];
  return list.some((u) => normalizeUnitToken(u) === normalized);
}