/**
 * @providesModule TcpSockets
 * @flow
 */
'use strict';

var ipRegex = require('ip-regex');

exports.Socket = require('./TcpSocket');

// Target API:
//
// var s = net.connect({port: 80, host: 'google.com'}, function() {
//   ...
// });
//
// There are various forms:
//
// connect(options, [cb])
// connect(port, [host], [cb])
// connect(path, [cb]);
//
exports.connect = exports.createConnection = function() {
  var args = normalizeConnectArgs(arguments);
  exports.Socket._debug('createConnection', args);
  var s = new exports.Socket(args[0]);
  return exports.Socket.prototype.connect.apply(s, args);
};

// Returns an array [options] or [options, cb]
// It is the same as the argument of Socket.prototype.connect().
function normalizeConnectArgs(args) {
  var options = {};

  if (args[0] !== null && typeof args[0] === 'object') {
    // connect(options, [cb])
    options = args[0];
  }/* else if (isPipeName(args[0])) {
    // connect(path, [cb]);
    options.path = args[0];
  }*/ else {
    // connect(port, [host], [cb])
    options.port = args[0];
    if (typeof args[1] === 'string') {
      options.host = args[1];
    }
  }

  var cb = args[args.length - 1];
  return typeof cb === 'function' ? [options, cb] : [options];
}

exports.createConnection = function(options: { port: number,host: ?string, localAddress: ?string, localPort: ?number, family: ?number }, callback : ?any) : exports.Socket {
  var tcpSocket = new exports.Socket();
  tcpSocket.connect(options, callback);
  return tcpSocket;
};

exports.isIP = function(input: string) : number {
  var result = 0;
  if (ipRegex.v4({exact: true}).test(input)) {
    result = 4;
  } else if (ipRegex.v6({exact: true}).test(input)) {
    result = 6;
  }
  return result;
};

exports.isIPv4 = function(input: string) : boolean {
  return exports.isIP(input) === 4;
};

exports.isIPv6 = function(input: string) : boolean {
  return exports.isIP(input) === 6;
};