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

  var KssMarkup = function (config) {
    this.bodyClass = config.bodyClass || 'kss-markup-mode';
    this.detailsClass = config.detailsClass || 'kss-markup';

    this.init();
  };

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

  // Activation function that takes the ID of the element that will receive
  // fullscreen focus.
  KssMarkup.prototype.showGuides = function () {
    var body = document.getElementsByTagName('body')[0],
      enabled = body.classList.contains(this.bodyClass);

    var elementList = document.querySelectorAll('.' + this.detailsClass);
    for (var el of elementList) {
      if (enabled) {
        el.removeAttribute('open');
      } else {
        el.setAttribute('open', '');
      }
    }

    // Toggle the markup mode.
    body.classList.toggle(this.bodyClass);
  };

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

})(window, document);