define([], function () {
  return function () {
    var self = this;

    var tabs = document.createElement("ul");
    tabs.classList.add("tabs");

    var container = document.createElement("div");

    function gotoTab(li) {
      for (var i = 0; i < tabs.children.length; i++)
        tabs.children[i].classList.remove("visible");

      while (container.firstChild)
        container.removeChild(container.firstChild);

      li.classList.add("visible");

      var tab = document.createElement("div");
      tab.classList.add("tab");
      container.appendChild(tab);
      li.child.render(tab);
    }

    function switchTab() {
      gotoTab(this);

      return false;
    }

    self.add = function (title, d) {
      var li = document.createElement("li");
      li.textContent = title;
      li.onclick = switchTab;
      li.child = d;
      tabs.appendChild(li);

      var anyVisible = false;

      for (var i = 0; i < tabs.children.length; i++)
        if (tabs.children[i].classList.contains("visible")) {
          anyVisible = true;
          break;
        }

      if (!anyVisible)
        gotoTab(li);
    };

    self.render = function (el) {
      el.appendChild(tabs);
      el.appendChild(container);
    };

    return self;
  };
});