class CurrentUser
  def self.scoped(user, ip_addr)
    old_user = self.user
    old_ip_addr = self.ip_addr

    self.user = user
    self.ip_addr = ip_addr

    begin
      yield
    ensure
      self.user = old_user
      self.ip_addr = old_ip_addr
    end
  end

  def self.user=(user)
    Thread.current[:current_user] = user
  end

  def self.ip_addr=(ip_addr)
    Thread.current[:current_ip_addr] = ip_addr
  end

  def self.user
    Thread.current[:current_user]
  end

  def self.ip_addr
    Thread.current[:current_ip_addr]
  end

  def self.id
    if user.nil?
      nil
    else
      user.id
    end
  end

  def self.name
    user.name
  end

  def self.method_missing(method, *params, &block)
    if user.respond_to?(method)
      user.__send__(method, *params, &block)
    else
      super
    end
  end
end