export const parseRangeHeader = (rangeHeader: string | null) => {
  if (!rangeHeader) return undefined;

  const firstRange = rangeHeader.split(",")[0]!.trim();
  const parts = firstRange.replace(/bytes=/, "").split("-");
  return {
    start: parts[0] ? parseInt(parts[0], 10) : undefined,
    end: parts[1] ? parseInt(parts[1], 10) : undefined,
  };
};

export const getContentRangeHeader = (range?: { start: number; end: number; total: number }) => {
  return range && { "Content-Range": `bytes ${range.start}-${range.end}/${range.total}` };
};