'use strict';

var URL = require('url-parse');

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:utils:url');
}

module.exports = {
  getOrigin: function(url) {
    if (!url) {
      return null;
    }

    var p = new URL(url);
    if (p.protocol === 'file:') {
      return null;
    }

    var port = p.port;
    if (!port) {
      port = (p.protocol === 'https:') ? '443' : '80';
    }

    return p.protocol + '//' + p.hostname + ':' + port;
  }

, isOriginEqual: function(a, b) {
    var res = this.getOrigin(a) === this.getOrigin(b);
    debug('same', a, b, res);
    return res;
  }

, isSchemeEqual: function(a, b) {
    return (a.split(':')[0] === b.split(':')[0]);
  }

, addPath: function (url, path) {
    var qs = url.split('?');
    return qs[0] + path + (qs[1] ? '?' + qs[1] : '');
  }

, addQuery: function (url, q) {
    return url + (url.indexOf('?') === -1 ? ('?' + q) : ('&' + q));
  }

, isLoopbackAddr: function (addr) {
    return /^127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^\[::1\]$/.test(addr);
  }
};