UE.registerUI("message", function(editor) {
  var editorui = baidu.editor.ui;
  var Message = editorui.Message;
  var holder;
  var _messageItems = [];
  var me = editor;

  me.setOpt("enableMessageShow", true);
  if (me.getOpt("enableMessageShow") === false) {
    return;
  }

  me.addListener("ready", function() {
    holder = document.getElementById(me.ui.id + "_message_holder");
    updateHolderPos();
    setTimeout(function() {
      updateHolderPos();
    }, 500);
  });

  me.addListener("showmessage", function(type, opt) {
    opt = utils.isString(opt)
      ? {
          content: opt
        }
      : opt;
    var message = new Message({
      timeout: opt.timeout,
      type: opt.type,
      content: opt.content,
      keepshow: opt.keepshow,
      editor: me
    }),
      mid = opt.id || "msg_" + (+new Date()).toString(36);
    message.render(holder);
    _messageItems[mid] = message;
    message.reset(opt);
    updateHolderPos();
    return mid;
  });

  me.addListener("updatemessage", function(type, id, opt) {
    opt = utils.isString(opt)
      ? {
          content: opt
        }
      : opt;
    var message = _messageItems[id];
    message.render(holder);
    message && message.reset(opt);
  });

  me.addListener("hidemessage", function(type, id) {
    var message = _messageItems[id];
    message && message.hide();
  });

  function updateHolderPos() {
    if (!holder || !me.ui) return;
    var toolbarbox = me.ui.getDom("toolbarbox");
    if (toolbarbox) {
      holder.style.top = toolbarbox.offsetHeight + 3 + "px";
    }
    holder.style.zIndex =
      Math.max(me.options.zIndex, me.iframe.style.zIndex) + 1;
  }
});