require 'bunny'
require 'active_support/all'

class Rabbitmq

	def self.publish(message, to, delay)
		channel = connection.create_channel
		queue = channel.queue(to, durable: true)
		channel.exchange_declare(DELAYED_EXCHANGE_NAME, 'x-delayed-message', durable: true, arguments: {'x-delayed-type' => 'direct'})
		queue.bind(DELAYED_EXCHANGE_NAME, routing_key: queue.name)
		puts "Message should be deliver at #{(Time.now+delay.seconds).strftime('%Y-%m-%d %H:%M:%S.%3N')}"
		channel.basic_publish(message, DELAYED_EXCHANGE_NAME, queue.name, persistent: true, headers: {'x-delay' => (delay*1000).to_i})
		puts "Or maybe message should be deliver at #{(Time.now+delay.seconds).strftime('%Y-%m-%d %H:%M:%S.%3N')}"
		channel.close if channel.open?
	end

	def self.subscribe(to)
		channel = connection.create_channel
		queue = channel.queue(to, durable: true)
		queue.subscribe(:block => false, :manual_ack => false) do |delivery_info, properties, body|
			puts "Message delivered at #{Time.now.strftime('%Y-%m-%d %H:%M:%S.%3N')}"
		end
	end

	private

	DELAYED_EXCHANGE_NAME = 'delay-exchange'

	def self.connection
		@conn ||= Bunny.new({host: 'localhost', port: 5672, username: 'guest', password: 'guest'})
		@conn.start
	end
end

Rabbitmq.subscribe(:test)
Rabbitmq.publish('test', :test, 10)
sleep 12