module StripeEvent
  class Subscriber
    def initialize(*names)
      @names = names
      ensure_valid_types!
    end
    
    def register(&block)
      ActiveSupport::Notifications.subscribe(pattern) do |*_, payload|
        block.call(payload[:event])
      end
    end
    
    def pattern
      Regexp.union(@names.empty? ? TYPE_LIST : @names)
    end
    
    private
    
    def ensure_valid_types!
      invalid_names = @names.select { |name| !TYPE_LIST.include?(name) }
      raise InvalidEventTypeError.new(invalid_names) if invalid_names.any?
    end
  end
end