require 'sylvilagus/init'
require 'sylvilagus/ch04'
require 'optparse'
require 'json'
require 'rabbitmq-client.jar'

class Sylvilagus::Ch04::AlertProducer
  def main
    options = {}
    OptionParser.new do |opts|
      opts.on('-rROUTING_KEY', '--routing-key=ROUTING_KEY',
              'Routing key for message (e.g. myalert.im)') do |r|
        options[:routing_key] = r
      end
      opts.on('-mMESSAGE', '--message=MESSAGE',
              'Message text for alert.') do |m|
        options[:message] = m
      end
    end.parse!

    unless options[:message] && options[:routing_key]
      STDERR.puts 'Need both message and routing_key!'
      exit 1
    end

    factory = Java::ComRabbitmqClient::ConnectionFactory.new
    factory.uri = ENV.fetch('SYLVILAGUS_ALERT_AMQP_URI')
    @conn = factory.new_connection
    channel = @conn.create_channel
    channel.exchange_declare('alerts', 'topic', true, false, false, nil)

    props = Java::ComRabbitmqClient::AMQP::BasicProperties.new
    props.content_type = 'application/json'

    json_msg = JSON.dump({'message' => options[:message]})
    channel.basic_publish('alerts', options[:routing_key],
                          true, true, props, json_msg.to_java_bytes)

    puts "Sent message #{json_msg.inspect} tagged " <<
         "with routing key #{options[:routing_key].inspect} to " <<
         'exchange "alerts" on vhost "/".'
  ensure
    @conn.close if @conn
  end
end

if $0 == __FILE__
  Sylvilagus::Ch04::AlertProducer.new.main
end