export function formatFileSize(size) {
  if (size === 0) return '0 B';
  const n = Math.floor(Math.log(size) / Math.log(1024));
  return (
    (size / Math.pow(1024, n)).toFixed(2) * 1 +
    ' ' +
    ['B', 'kB', 'MB', 'GB', 'TB'][n]
  );
}

export function httpErrorToStr(error) {
  if (!error) return 'Unknown error';
  if (error.response) {
    try {
      const jsonResponse = JSON.parse(error.response);
      if (
        jsonResponse.error &&
        jsonResponse.error.code &&
        jsonResponse.error.message
      )
        return jsonResponse.error.code + ' - ' + jsonResponse.error.message;
    } catch (err) {
      return error.response;
    }
  }
  return error.message || 'Unknown error.';
}

/* eslint-disable */
export function checkDicomFile(arrayBuffer) {
  if (arrayBuffer.length <= 132) return false;
  const arr = new Uint8Array(arrayBuffer.slice(128, 132));
  // bytes from 128 to 132 must be "DICM"
  return Array.from('DICM').every((char, i) => char.charCodeAt(0) === arr[i]);
}