var testHelper = {};

(function () {
  var $iframeContainer = $("#iframe-container"),
    $iframe;

  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 () {
    return $iframe.contents()
  }

  testHelper.$getPadOuter = function () {
    return testHelper.$getPadChrome()
      .find('iframe.[name="ace_outer"]')
      .contents();
  }

  testHelper.$getPadInner = function () {
    return testHelper.$getPadOuter()
      .find('iframe.[name="ace_inner"]')
      .contents();
  }

  // copied from http: //stackoverflow.com/questions/985272/jquery-selecting-text-in-an-element-akin-to-highlighting-with-your-mouse
  testHelper.selectText = function (element) {
    var doc = document,
      range, selection;

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