'use strict';

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

var _os = _interopRequireDefault(require('os'));

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

function _normalizeFamily(family) {
  return family ? family.toLowerCase() : 'ipv4';
}

function priority(name) {
  if (name.startsWith('en') || name.startsWith('eth')) {
    return 0;
  }
  if (name.startsWith('wlan')) {
    return 1;
  }

  return 2;
}

function isLoopback(addr) {
  return (/^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})/.test(addr) || /^fe80::1$/.test(addr) || /^::1$/.test(addr) || /^::$/.test(addr)
  );
}

function isPrivate(addr) {
  return (/^(::f{4}:)?10\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^(::f{4}:)?192\.168\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^(::f{4}:)?172\.(1[6-9]|2\d|30|31)\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^(::f{4}:)?169\.254\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^f[cd][0-9a-f]{2}:/i.test(addr) || /^fe80:/i.test(addr) || /^::1$/.test(addr) || /^::$/.test(addr)
  );
}

function isPublic(addr) {
  return !isPrivate(addr);
}

function loopback(family) {
  //
  // Default to `ipv4`
  //
  family = _normalizeFamily(family);

  if (family !== 'ipv4' && family !== 'ipv6') {
    throw new Error('family must be ipv4 or ipv6');
  }

  return family === 'ipv4' ? '127.0.0.1' : 'fe80::1';
}

function address(name, family) {
  var interfaces = _os.default.networkInterfaces();
  var all;

  // Default to `ipv4`
  //
  family = _normalizeFamily(family);

  // If a specific network interface has been named,
  // return the address.
  //
  if (name && name !== 'private' && name !== 'public') {
    var res = interfaces[name].filter(function (details) {
      var itemFamily = details.family.toLowerCase();
      return itemFamily === family;
    });
    if (res.length === 0) {
      return undefined;
    }

    return res[0].address;
  }

  var sortedInterfaces = Object.keys(interfaces).sort(function (a, b) {
    return priority(a) - priority(b);
  });

  var all = sortedInterfaces.map(function (nic) {
    //
    // Note: name will only be `public` or `private`
    // when this is called.
    //
    var addresses = interfaces[nic].filter(function (details) {
      details.family = details.family.toLowerCase();
      if (details.family !== family || isLoopback(details.address)) {
        return false;
      } else if (!name) {
        return true;
      }

      return name === 'public' ? isPrivate(details.address) : isPublic(details.address);
    });

    return addresses.length ? addresses[0].address : undefined;
  }).filter(Boolean);

  return !all.length ? loopback(family) : all[0];
}

exports.default = {
  address
};
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