"use strict";

(function () {
  var heapEnabled = typeof heap !== 'undefined' && typeof heap.track === 'function';

  window.heapTrack = function (event, data) {
    if (heapEnabled) heap.track(event, data);
  };

  if (!heapEnabled) return;

  var catchHovers = function catchHovers() {
    var hovered = {},
      node,
      text;
    return function (e) {
      node = document.querySelector('[data-toggle="' + e.target.id + '"]');

      if (node && (text = node.innerText) && hovered[text] === undefined) {
        hovered[text] = true;
        heap.track('Keyword Hover', {
          target: text
        });
      }
    };
  };

  var catchScroll = function catchScroll() {
    var active = null,
      scrollPoints = {},
      text;
    return function () {
      active = document.querySelectorAll('.o-ld-sidebar__item--active');
      if (active.length === 0) return;
      text = active[active.length - 1].textContent.replace(/\s+/g, ' ').trim();

      if (scrollPoints[text] === undefined) {
        scrollPoints[text] = true;
        heap.track('Scroll Page', {
          target: text
        });
      }
    };
  };

  var catchSelection = function catchSelection() {
    var x;
    return _.debounce(function () {
      x = document.getSelection().toString();

      if (x && x.length) {
        heap.track('Select Text', {
          size: x.length,
          text: x.substring(0, 100)
        });
      }
    }, 500, {
      leading: false
    });
  };

  var initScrollCatching = function initScrollCatching() {
    $(document.querySelector('[id$="-page"]')).on('scrollme.zf.trigger', catchScroll());
  };

  document.addEventListener('DOMContentLoaded', function () {
    document.addEventListener('turbolinks:click', function () {
      heap.track('Page Before Change');
    });
    document.addEventListener('turbolinks:load', initScrollCatching);
    initScrollCatching();
    document.addEventListener('selectionchange', catchSelection());
    $(document).on('show.zf.dropdown', catchHovers());
    window.addEventListener('beforeunload', function () {
      heap.track('Page Unload');
    });
  });
})();