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import assertString from './util/assertString';
var imeiRegexWithoutHypens = /^[0-9]{15}$/;
var imeiRegexWithHypens = /^\d{2}-\d{6}-\d{6}-\d{1}$/;
export default function isIMEI(str, options) {
  assertString(str);
  options = options || {}; // default regex for checking imei is the one without hyphens

  var imeiRegex = imeiRegexWithoutHypens;

  if (options.allow_hyphens) {
    imeiRegex = imeiRegexWithHypens;
  }

  if (!imeiRegex.test(str)) {
    return false;
  }

  str = str.replace(/-/g, '');
  var sum = 0,
      mul = 2,
      l = 14;

  for (var i = 0; i < l; i++) {
    var digit = str.substring(l - i - 1, l - i);
    var tp = parseInt(digit, 10) * mul;

    if (tp >= 10) {
      sum += tp % 10 + 1;
    } else {
      sum += tp;
    }

    if (mul === 1) {
      mul += 1;
    } else {
      mul -= 1;
    }
  }

  var chk = (10 - sum % 10) % 10;

  if (chk !== parseInt(str.substring(14, 15), 10)) {
    return false;
  }

  return true;
}