text: /* global hexo */
  
  'use strict';
  
  var pathFn = require('path');
  var _ = require('lodash');
  var cheerio = require('cheerio');
  var lunr = require('lunr');
  
  var localizedPath = ['docs', 'api'];
  
  function startsWith(str, start) {
    return str.substring(0, start.length) === start;
  }
  
  hexo.extend.helper.register('page_nav', function() {
    var type = this.page.canonical_path.split('/')[0];
    var sidebar = this.site.data.sidebar[type];
    var path = pathFn.basename(this.path);
    var list = {};
    var prefix = 'sidebar.' + type + '.';
  
    for (var i in sidebar) {
      for (var j in sidebar[i]) {
        list[sidebar[i][j]] = j;
      }
    }
  
    var keys = Object.keys(list);
    var index = keys.indexOf("/docs/" + path);
    var result = '';
  
    if (index > 0) {
      result += '<a href="' + keys[index - 1] + '" class="article-footer-prev" title="' + this.__(prefix + list[keys[index - 1]]) + '">'
        + '<i class="fa fa-chevron-left"></i><span>' + this.__('page.prev') + '</span></a>';
    }
  
    if (index < keys.length - 1) {
      result += '<a href="' + keys[index + 1] + '" class="article-footer-next" title="' + this.__(prefix + list[keys[index + 1]]) + '">'
        + '<span>' + this.__('page.next') + '</span><i class="fa fa-chevron-right"></i></a>';
    }
  
    return result;
  });
  
  hexo.extend.helper.register('doc_sidebar', function(className) {
    var type = this.page.canonical_path.split('/')[0];
    var sidebar = this.site.data.sidebar[type];
    var path = pathFn.basename(this.path);
    var result = '';
    var self = this;
    var prefix = 'sidebar.' + type + '.';
  
    _.each(sidebar, function(menu, title) {
      result += '<strong class="' + className + '-title">' + self.__(prefix + title) + '</strong>';
  
      _.each(menu, function(link, text) {
        var itemClass = className + '-link';
        if (link === path) itemClass += ' current';
  
        result += '<a href="' + link + '" class="' + itemClass + '">' + self.__(prefix + text) + '</a>';
      });
    });
  
    return result;
  });
  
  hexo.extend.helper.register('header_menu', function(className) {
    var menu = this.site.data.menu;
    var result = '';
    var self = this;
    var lang = this.page.lang;
    var isEnglish = lang === 'en';
  
    _.each(menu, function(path, title) {
      if (!isEnglish && ~localizedPath.indexOf(title)) path = lang + path;
  
      result += '<a href="' + self.url_for(path) + '" class="' + className + '-link">' + self.__('menu.' + title) + '</a>';
    });
  
    return result;
  });
  
  hexo.extend.helper.register('canonical_url', function(lang) {
    var path = this.page.canonical_path;
    if (lang && lang !== 'en') path = lang + '/' + path;
  
    return this.config.url + '/' + path;
  });
  
  hexo.extend.helper.register('url_for_lang', function(path) {
    var lang = this.page.lang;
    var url = this.url_for(path);
  
    if (lang !== 'en' && url[0] === '/') url = '/' + lang + url;
  
    return url;
  });
  
  hexo.extend.helper.register('raw_link', function(path) {
    return 'https://github.com/status-im/nimbus-site/edit/develop/source/' + path;
  });
  
  hexo.extend.helper.register('page_anchor', function(str) {
    var $ = cheerio.load(str, {decodeEntities: false});
    var headings = $('h1, h2, h3, h4, h5, h6');
  
    if (!headings.length) return str;
  
    headings.each(function() {
      var id = $(this).attr('id');
  
      $(this)
        .addClass('article-heading')
        .append('<a class="article-anchor" href="#' + id + '" aria-hidden="true"></a>');
    });
  
    return $.html();
  });
  
  hexo.extend.helper.register('lunr_index', function(data) {
    var index = lunr(function() {
      this.field('name', {boost: 10});
      this.field('tags', {boost: 50});
      this.field('description');
      this.ref('id');
  
      _.sortBy(data, 'name').forEach((item, i) => {
        this.add(_.assign({ id: i }, item));
      });
    });
  
    return JSON.stringify(index);
  });
  
  hexo.extend.helper.register('canonical_path_for_nav', function() {
    var path = this.page.canonical_path;
  
    if (startsWith(path, 'docs/') || startsWith(path, 'api/')) {
      return path;
    }
    return '';
  
  });
  
  hexo.extend.helper.register('lang_name', function(lang) {
    var data = this.site.data.languages[lang];
    return data.name || data;
  });
  
  hexo.extend.helper.register('disqus_lang', function() {
    var lang = this.page.lang;
    var data = this.site.data.languages[lang];
  
    return data.disqus_lang || lang;
  });
  
  hexo.extend.helper.register('hexo_version', function() {
    return this.env.version;
  });
  
  