AdminAutocompleteApp

class AdminAutocompleteApp
  def self.call(env)
    I18n.locale = :ru
    params = Rack::Request.new(env).params

    raw_klass = params['custom'].try(:fetch, 'class') || params['class']
    klass = Rack::Utils.unescape(raw_klass).safe_constantize
    options = params.slice('with', 'with_all', 'without', 'page', 'per_page').symbolize_keys
    options[:no_escape] = true

    case klass.name
      when 'Structure'
        options[:order] = 'lft'
        options[:per_page] = 100
      else
        options[:order] = 'created_at'
        options[:sort_mode] = 'desc'
    end

    q = params['q'].to_s.force_encoding('UTF-8')
    entries = klass.ac_search(q, options).to_a
    entries = klass.ac_search(q.tr_lang, options).to_a if entries.empty?
    attr = params['attr'] || (klass.ac_opts[:localized] ? "#{klass.ac_attr}_#{I18n.locale}" : klass.ac_attr.to_s)

    if params['token']
      res = entries.map { |r| klass.for_input_token(r, attr) }
    else
      suggestions = entries.map_val(attr)
      res = {suggestions: suggestions, data: entries.map_val(:id), query: q}
    end

    [200, {'Content-Type' => 'application/json'}, res.to_json]
  end

end