module Protobuf
  class Lifecycle
    include ::Protobuf::Logger::LogMethods

    def self.register( event_name, &blk )
      raise "Lifecycle register must have a block" unless block_given?

      event_name = normalized_event_name( event_name )

      if ::Protobuf.print_deprecation_warnings?
        $stderr.puts <<-ERROR
            [DEPRECATED] ::Protobuf::Lifecycle has been deprecated and will be removed in a future version.
                         Use ::ActiveSupport::Notifications.subscribe('#{event_name}')
        ERROR
      end

      ::ActiveSupport::Notifications.subscribe(event_name) do |name, start, finish, id, args|
        blk.call(*args)
      end
    end

    def self.trigger( event_name, *args )
      if ::Protobuf.print_deprecation_warnings?
        $stderr.puts <<-ERROR
            [DEPRECATED] ::Protobuf::Lifecycle has been deprecated and will be removed in a future version.
                         Use ::ActiveSupport::Notifications.instrument(...)
        ERROR
      end

      event_name = normalized_event_name( event_name )

      ::ActiveSupport::Notifications.instrument(event_name, args)
    end

    def self.normalized_event_name( event_name )
      return "#{event_name}".downcase
    end

    class << self
      attr_accessor :lifecycle_events

      alias_method :on, :register
    end

    @lifecycle_events ||= {}
  end
end