(function() {
  function displaySearchResults(results, store) {
    var searchResults = document.getElementById('search-results');

    if (results.length) { // Are there any results?
      var appendString = '';

      for (var i = 0; i < results.length; i++) {  // Iterate over the results
        var item = store[results[i].ref];
        appendString += '<a href="' + item.url + '"><h3>' + item.title + '</h3></a>';
        appendString += '<p>' + item.content.substring(0, 150) + '...</p><br />';
      }

      searchResults.innerHTML = appendString;
    } else {
      searchResults.innerHTML = '<li>По вашему запросу ничего не найдено</li>';
    }
  }

  function getQueryVariable(variable) {
    var query = window.location.search.substring(1);
    var vars = query.split('&');

    for (var i = 0; i < vars.length; i++) {
      var pair = vars[i].split('=');

      if (pair[0] === variable) {
        return decodeURIComponent(pair[1].replace(/\+/g, '%20'));
      }
    }
  }

  var searchTerm = getQueryVariable('query');

  if (searchTerm) {
    document.getElementById('search-box').setAttribute("value", searchTerm);

    // Initalize lunr with the fields it will be searching on. I've given title
    // a boost of 10 to indicate matches on this field are more important.
    require([assetsUrl+'/lunr.min.js', assetsUrl+'/lunr.stemmer.support.js', assetsUrl+'/lunr.de.js', assetsUrl+'/lunr.ru.js', assetsUrl+'/lunr.multi.js'], function(lunr, stemmerSupport, de, ru, multiLanguage) {

      stemmerSupport(lunr);
      de(lunr);
      ru(lunr);
      multiLanguage(lunr)

      var idx = lunr(function () {
        this.field('id');
        this.field('title');
        this.field('author');
        this.field('category');
        this.field('content');

        this.use(lunr.multiLanguage('en', 'de', 'ru'));

        for (var key in window.store) { // Add the data to lunr
          this.add({
            'id': key,
            'title': window.store[key].title,
            'author': window.store[key].author,
            'category': window.store[key].category,
            'content': window.store[key].content
          });
        }

      });

      var results = idx.search(searchTerm); // Get lunr to perform a search
      displaySearchResults(results, window.store); // We'll write this in the next section
    })
  }
})();