var testHelper = {};

(function(){
  var $iframeContainer, $iframe;

  testHelper.init = function(){
    $iframeContainer = $("#iframe-container");
  }

  testHelper.randomString = function randomString(len)
  {
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    var randomstring = '';
    for (var i = 0; i < len; i++)
    {
      var rnum = Math.floor(Math.random() * chars.length);
      randomstring += chars.substring(rnum, rnum + 1);
    }
    return randomstring;
  }

  testHelper.newPad = function(cb){
    var padName = "FRONTEND_TEST_" + testHelper.randomString(20);
    $iframe = $("<iframe src='/p/" + padName + "'></iframe>");

    $iframeContainer.empty().append($iframe);

    var checkInterval;
    $iframe.load(function(){
      checkInterval = setInterval(function(){
        var loaded = false;

        try {
          //check if loading div is hidden
          loaded = !testHelper.$getPadChrome().find("#editorloadingbox").is(":visible");
        } catch(e){}

        if(loaded){
          clearTimeout(timeout);
          clearInterval(checkInterval);

          cb(null, {name: padName});
        }
      }, 100);
    });

    var timeout = setTimeout(function(){
      if(checkInterval) clearInterval(checkInterval);
      cb(new Error("Pad didn't load in 10 seconds"));
    }, 10000);

    return padName;
  }

  testHelper.$getPadChrome = function(){
    var win = $iframe[0].contentWindow;
    var $content = $iframe.contents();
    $content.window = win;

    return $content;
  }

  testHelper.$getPadOuter = function(){
    var $iframe = testHelper.$getPadChrome().find('iframe.[name="ace_outer"]');
    var win = $iframe[0].contentWindow;
    var $content = $iframe.contents();
    $content.window = win;

    return $content;
  }

  testHelper.$getPadInner = function(){
    var $iframe = testHelper.$getPadOuter().find('iframe.[name="ace_inner"]');
    var win = $iframe[0].contentWindow;
    var $content = $iframe.contents();
    $content.window = win;

    return $content;
  }

  // copied from http://stackoverflow.com/questions/985272/jquery-selecting-text-in-an-element-akin-to-highlighting-with-your-mouse
  // selects the whole dom element you give it
  testHelper.selectText = function(element, $iframe){
    var doc = $iframe[0], win = $iframe.window, range, selection;

    if (doc.body.createTextRange) { //ms
        range = doc.body.createTextRange();
        range.moveToElementText(element);
        range.select();
    } else if (win.getSelection) { //all others
        selection = win.getSelection();        
        range = doc.createRange();
        range.selectNodeContents(element);
        selection.removeAllRanges();
        selection.addRange(range);
    }
  }
})()