jQuery(document).on("ready", function() {
  var js_code_input = jQuery("textarea#js_code");
  var warning = jQuery("<span style='display:none;color:red;'>Not valid Announcekit Javascript Code</span>");
  var menu_field = jQuery("table.form-table tr:eq(3)");
  var snippet = js_code_input.val();

  if (snippet != "") {
    var have_selector = /\"selector\"/.test(js_code_input.val());
    if (!have_selector) {
      menu_field.hide();
    } else {
      menu_field.show();
    }
  }

  warning.insertAfter(js_code_input);

  js_code_input.on("blur", function() {
    var snippet = jQuery(this).val();
    var is_valid_snippet = /https:\/\/announcekit\.app\/widget\//.test(snippet);

    if (!is_valid_snippet) {
      warning.show();
    } else {
      warning.hide();
    }

    var have_selector = /\"selector\"/.test(snippet);
    if (!have_selector) {
      menu_field.hide();
    } else {
      menu_field.show();
    }
  });
});