var longurlplease = {
  // At the moment clients must maintain a list of services which they will attempt to lengthen short urls for
  shortUrlsPattern : new RegExp("^(http(s?)://(307\.to|adjix\.com|b23\.ru|bacn\.me|bit\.ly|bloat\.me|budurl\.com|cli\.gs|clipurl\.us|cort\.as|digg\.com|dwarfurl\.com|fb\.me|ff\.im|fff\.to|href\.in|idek\.net|is\.gd|j\.mp|kl\.am|korta\.nu|lin\.cr|livesi\.de|ln\-s\.net|loopt\.us|lost\.in|memurl\.com|merky\.de|migre\.me|moourl\.com|nanourl\.se|om\.ly|ow\.ly|peaurl\.com|ping\.fm|piurl\.com|plurl\.me|pnt\.me|poprl\.com|post\.ly|rde\.me|reallytinyurl\.com|redir\.ec|retwt\.me|rubyurl\.com|short\.ie|short\.to|smallr\.com|sn\.im|sn\.vc|snipr\.com|snipurl\.com|snurl\.com|su\.pr|tiny\.cc|tinysong\.com|tinyurl\.com|togoto\.us|tr\.im|tra\.kz|trg\.li|twurl\.cc|twurl\.nl|u\.mavrev\.com|u\.nu|ur1\.ca|url\.az|url\.ie|urlx\.ie|w34\.us|xrl\.us|yep\.it|zi\.ma|zurl\.ws)/[a-zA-Z0-9_-]+)$|((^http(s?)://[a-zA-Z0-9_-]+\.notlong\.com)|(^http(s?)://[a-zA-Z0-9_-]+\.qlnk\.net)|(^http(s?)://chilp\.it/[?][a-zA-Z0-9_-]+)|(^http(s?)://goo\.gl/fb/[a-zA-Z0-9_-]+)|(^http(s?)://trim\.li/nk/[a-zA-Z0-9_-]+)|(^http(s?)://url4\.eu/[a-zA-Z0-9_-]+))[/]?$"),
  numberOfUrlsPerBatch : 4,
  lengthen : function(options) {
    if (typeof(options) == 'undefined')
      options = {}

    var makeRequest = function() { alert('not sure how to call api'); };
    if (options.transport != null ){
      if (options.transport.toLowerCase() == 'air')
        makeRequest = longurlplease.makeRequestWithAir;
      else if (options.transport.toLowerCase() == 'flxhr')
        makeRequest = longurlplease.makeRequestWithFlxhr;
      else if (options.transport.toLowerCase() == 'jquery')
        makeRequest = longurlplease.makeRequestWithJQuery;
    }

    var urlToElements = options.urlToElements;
    var toLengthen = options.toLengthen;
    if (toLengthen == null || urlToElements == null) {
      var parent = document;
      if(options.element != null)
        parent = options.element;
      urlToElements = {};
      toLengthen = [];
      var els = parent.getElementsByTagName('a');
      for (var elIndex = 0; elIndex < els.length; elIndex++) {
        var el = els[elIndex];
        if (longurlplease.shortUrlsPattern.test(el.href)) {
          toLengthen.push(el.href);
          var listOfElements = urlToElements[el.href];
          if (listOfElements == null)
            listOfElements = []
          listOfElements.push(el);
          urlToElements[el.href] = listOfElements;
        }
      }
    }

    var lengthenShortUrl = longurlplease.defaultExpandMethod;

    if (options.lengthenShortUrl != null)
    {
      if(typeof options.lengthenShortUrl == 'function')
        lengthenShortUrl = options.lengthenShortUrl
      else if(typeof options.lengthenShortUrl == 'string')
      {
        if(options.lengthenShortUrl == 'href-only')
          lengthenShortUrl = longurlplease.hrefOnlyExpandMethod;
        else if(options.lengthenShortUrl == 'full')
          lengthenShortUrl = longurlplease.fullExpandMethod;
        else if(options.lengthenShortUrl == 'text-and-title')
          lengthenShortUrl = longurlplease.textAndTitleExpandMethod;
      }
    }

    var handleResponseEntry = function(shortUrl, longUrl) {
      var aTags = urlToElements[shortUrl];
      for (var ai = 0; ai < aTags.length; ai++)
        lengthenShortUrl(aTags[ai], longUrl);
    };
    var subArray, i = 0;
    while (i < toLengthen.length) {
      subArray = toLengthen.slice(i, i + longurlplease.numberOfUrlsPerBatch)
      var paramString = longurlplease.toParamString(subArray);
      makeRequest(paramString, handleResponseEntry);
      i = i + longurlplease.numberOfUrlsPerBatch;
    }
  },
  defaultExpandMethod: function(aTag, longUrl) {
    // You can customize this - my intention here is to alter the visible text to use as much of the long url
    // as possible, but maintain the same number of characters to help keep visual consistancy.
    if (aTag.href == aTag.innerHTML) {
      var linkText = longUrl.replace(/^http(s?):\/\//, '').replace(/^www\./, '');
      aTag.innerHTML = linkText.substring(0, aTag.innerHTML.length - 3) + '...';
    }
    aTag.href = longUrl;
  },
  hrefOnlyExpandMethod : function(aTag, longUrl) {
    aTag.href = longUrl;
  },
  fullExpandMethod : function(aTag, longUrl) {
    aTag.href = longUrl;
    aTag.innerHTML = longUrl;
  },
  textAndTitleExpandMethod : function(aTag, longUrl) {
    var linkText = longUrl.replace(/^http(s?):\/\//, '').replace(/^www\./, '');
    aTag.innerHTML = linkText.substring(0, aTag.innerHTML.length - 3) + '...';
    aTag.title = longUrl;
  },
  toParamString : function(shortUrls) {
    var paramString = "";
    for (var j = 0; j < shortUrls.length; j++) {
      var href = shortUrls[j];
      paramString += "q=";
      paramString += encodeURI(href);
      if (j < shortUrls.length - 1)
        paramString += '&'
    }
    return paramString;
  },
  apiUrl : function() {
    return (("https:" == document.location.protocol) ? "https" : "http") + "://longurlplease.appspot.com/api/v1.1";
  },
  makeRequestWithAir : function(paramString, callback) {
    var loader = new air.URLLoader();
    loader.addEventListener(air.Event.COMPLETE, function (event) {
      JSON.parse(event.target.data, function (key, val) {
        if (typeof val === 'string' && val != null)
          callback(key, val);
      });
    });
    var request = new air.URLRequest(longurlplease.apiUrl() + "?ua=air&" + paramString);
    loader.load(request);
  },
  // made possible by http://flxhr.flensed.com/
  makeRequestWithFlxhr : function(paramString, callback) {
    var flproxy = new flensed.flXHR({ autoUpdatePlayer:true, xmlResponseText:false, instancePooling:true, onreadystatechange:function (XHRobj) {
      if (XHRobj.readyState == 4)
        JSON.parse(XHRobj.responseText, function (key, val) {
          if (typeof val === 'string' && val != null)
            callback(key, val);
        });
    }});
    flproxy.open("GET", longurlplease.apiUrl() + "?ua=flxhr&" + paramString);
    flproxy.send();
  },
  makeRequestWithJQuery : function(paramString, callback) {
    jQuery.getJSON(longurlplease.apiUrl() + "?ua=jquery&" + paramString + "&callback=?",
            function(data) {
              jQuery.each(data, function(key, val) {
                if (val != null)
                  callback(key, val);
              });
            });
  }
};

if (typeof(jQuery) != 'undefined') {
  jQuery.longurlplease = function(options) {
    jQuery('body').longurlplease(options)
  };
  jQuery.fn.longurlplease = function(options) {
    if (typeof(options) == 'undefined')
      options = {}
    options.transport = 'jquery';
    var toLengthen = [];
    var urlToElements = {};
    this.find('a').filter(function() {
      return this.href.match(longurlplease.shortUrlsPattern)
    }).each(function() {
      toLengthen.push(this.href);
      var listOfElements = urlToElements[this.href];
      if (listOfElements == null)
        listOfElements = []
      listOfElements.push(this);
      urlToElements[this.href] = listOfElements;
    });
    options.toLengthen = toLengthen;
    options.urlToElements = urlToElements;
    longurlplease.lengthen(options);
    return this;
  };
}