$(function() {

  // register a handler to move the focus to the search bar

  // upon pressing shift + "/" (i.e. "?")

  $(document).on('keydown', function(e) {

    if (e.shiftKey && e.keyCode == 191) {

      e.preventDefault();

      $("#search-input").focus();

    }

  });

  $(document).ready(function() {

    // do keyword highlighting

    /* modified from https://jsfiddle.net/julmot/bL6bb5oo/ */

    var mark = function() {

      var referrer = document.URL ;

      var paramKey = "q" ;

      if (referrer.indexOf("?") !== -1) {

        var qs = referrer.substr(referrer.indexOf('?') + 1);

        var qs_noanchor = qs.split('#')[0];

        var qsa = qs_noanchor.split('&');

        var keyword = "";

        for (var i = 0; i < qsa.length; i++) {

          var currentParam = qsa[i].split('=');

          if (currentParam.length !== 2) {

            continue;

          }

          if (currentParam[0] == paramKey) {

            keyword = decodeURIComponent(currentParam[1].replace(/\+/g, "%20"));

          }

        }

        if (keyword !== "") {

          $(".contents").unmark({

            done: function() {

              $(".contents").mark(keyword);

            }

          });

        }

      }

    };

    mark();

  });

});

/* Search term highlighting ------------------------------*/

function matchedWords(hit) {

  var words = [];

  var hierarchy = hit._highlightResult.hierarchy;

  // loop to fetch from lvl0, lvl1, etc.

  for (var idx in hierarchy) {

    words = words.concat(hierarchy[idx].matchedWords);

  }

  var content = hit._highlightResult.content;

  if (content) {

    words = words.concat(content.matchedWords);

  }

  // return unique words

  var words_uniq = [...new Set(words)];

  return words_uniq;

}

function updateHitURL(hit) {

  var words = matchedWords(hit);

  var url = "";

  if (hit.anchor) {

    url = hit.url_without_anchor + '?q=' + escape(words.join(" ")) + '#' + hit.anchor;

  } else {

    url = hit.url + '?q=' + escape(words.join(" "));

  }

  return url;

}