class UserAgent::Browsers::WechatBrowser

def os
  return unless application && application.comment
  if application.comment[0] =~ /Windows NT/
    OperatingSystems.normalize_os(application.comment[0])
  elsif application.comment[2].nil?
    OperatingSystems.normalize_os(application.comment[1])
  elsif application.comment[1] =~ /Android/
    OperatingSystems.normalize_os(application.comment[1])
  else
    OperatingSystems.normalize_os(application.comment[2])
  end
end