class ActionMailbox::Router

def add_route(address, to:)
  routes.append Route.new(address, to: to)
end

def add_routes(routes)
  routes.each do |(address, mailbox_name)|
    add_route address, to: mailbox_name
  end
end

def initialize
  @routes = []
end

def mailbox_for(inbound_email)
  routes.detect { |route| route.match?(inbound_email) }&.mailbox_class
end

def route(inbound_email)
  if mailbox = mailbox_for(inbound_email)
    mailbox.receive(inbound_email)
  else
    inbound_email.bounced!
    raise RoutingError
  end
end