utils.jq(() => {
    var $inputArea = $("input#search-input");
    if ($inputArea.length === 0) {
      return;
    }
  
    var $resultArea = $("#search-result");
    var $searchWrapper = $("#search-wrapper");
    var client = algoliasearch(window.searchConfig.appId, window.searchConfig.apiKey);
    var index = client.initIndex(window.searchConfig.indexName);
  
    function displayResults(hits) {
      var $resultList = $("<ul>").addClass("search-result-list");
      if (hits.length === 0) {
        $searchWrapper.addClass('noresult');
      } else {
        $searchWrapper.removeClass('noresult');
        hits.forEach(function(hit) {
          var contentSnippet = hit._snippetResult.content.value;
          var title = hit.hierarchy.lvl1 || 'Untitled';
          var $item = $("<li>").html(`<a href="${hit.url}"><span class='search-result-title'>${title}</span><p class="search-result-content">${contentSnippet}</p></a>`);
          $resultList.append($item);
        });
      }
      $resultArea.html($resultList);
    }
  
    $inputArea.on("input", function() {
      var query = $(this).val().trim();
  
      if (query.length <= 0) {
        $searchWrapper.attr('searching', 'false');
        $resultArea.empty();
        return;
      }
  
      $searchWrapper.attr('searching', 'true');
  
      index.search(query, {
        hitsPerPage: window.searchConfig.hitsPerPage,
        attributesToHighlight: ['content'],
        attributesToSnippet: ['content:30'],
        highlightPreTag: '<span class="search-keyword">',
        highlightPostTag: '</span>',
        restrictSearchableAttributes: ['content']
      }).then(function(responses) {
        displayResults(responses.hits);
      });
    });
  
    $inputArea.on("keydown", function(e) {
      if (e.which == 13) {
        e.preventDefault();
      }
    });
  
    var observer = new MutationObserver(function(mutationsList) {
      if (mutationsList.length === 1) {
        if (mutationsList[0].addedNodes.length) {
          $searchWrapper.removeClass('noresult');
        } else if (mutationsList[0].removedNodes.length) {
          $searchWrapper.addClass('noresult');
        }
      }
    });
  
    observer.observe($resultArea[0], { childList: true });
  });