'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = isCreditCard;

var _assertString = require('./util/assertString');

var _assertString2 = _interopRequireDefault(_assertString);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/* eslint-disable max-len */
var creditCard = /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})|62[0-9]{14}$/;
/* eslint-enable max-len */

function isCreditCard(str) {
  (0, _assertString2.default)(str);
  var sanitized = str.replace(/[^0-9]+/g, '');
  if (!creditCard.test(sanitized)) {
    return false;
  }
  var sum = 0;
  var digit = void 0;
  var tmpNum = void 0;
  var shouldDouble = void 0;
  for (var i = sanitized.length - 1; i >= 0; i--) {
    digit = sanitized.substring(i, i + 1);
    tmpNum = parseInt(digit, 10);
    if (shouldDouble) {
      tmpNum *= 2;
      if (tmpNum >= 10) {
        sum += tmpNum % 10 + 1;
      } else {
        sum += tmpNum;
      }
    } else {
      sum += tmpNum;
    }
    shouldDouble = !shouldDouble;
  }
  return !!(sum % 10 === 0 ? sanitized : false);
}
module.exports = exports['default'];