(function (window, document) {
  'use strict';

  var KssGuides = function (config) {
    this.bodyClass = config.bodyClass || 'kss-guides-mode';

    this.init();
  };

  KssGuides.prototype.init = function () {
    var self = this;
    // Initialize all guides toggle buttons.
    var elementList = document.querySelectorAll('a[data-kss-guides]');
    for (var button of elementList) {
      button.onclick = self.showGuides.bind(self);
    }
  };

  // Toggle the guides mode.
  KssGuides.prototype.showGuides = function () {
    document.getElementsByTagName('body')[0].classList.toggle(this.bodyClass);
  };

  // Export to DOM global space.
  window.KssGuides = KssGuides;

})(window, document);