module ZuoraConnect
  class Telegraf
    attr_accessor :host

    OUTBOUND_METRICS = true
    OUTBOUND_METRICS_NAME = "request-outbound"
    INBOUND_METRICS = true
    INBOUND_METRICS_NAME = "request-inbound"

    def initialize
      self.connect
    end

    def connect
      ZuoraConnect.logger.debug(self.format_metric_log('Telegraf','Need new connection')) if ZuoraConnect.configuration.telegraf_debug
      uri = URI.parse(ZuoraConnect.configuration.telegraf_endpoint)
      self.host = UDPSocket.new.tap do |socket|
        socket.connect uri.host, uri.port
      end
    rescue => ex
      self.host = nil
      ZuoraConnect.logger.warn(self.format_metric_log('Telegraf', "Failed to connect: #{ex.class}")) if Rails.env.to_s != 'production'
    end

    def write(direction: 'Unknown', tags: {}, values: {})
      time = Benchmark.measure do |bench|
        # To avoid writing metrics from rspec tests
        if Rails.env.to_sym != :test
          app_instance = Thread.current[:appinstance].present? ? Thread.current[:appinstance].id : 0
          tags = { app_name: ZuoraObservability::Env.app_name, process_type: ZuoraObservability::Env.process_type, app_instance: app_instance, pod_name: ZuoraObservability::Env.pod_name}.merge(tags)

          if direction == :inbound
            if INBOUND_METRICS && !Thread.current[:inbound_metric].to_bool
              self.write_udp(series: INBOUND_METRICS_NAME, tags: tags, values: values)
              Thread.current[:inbound_metric] = true
            else
              return
            end
          elsif direction == :outbound
            self.write_udp(series: OUTBOUND_METRICS_NAME, tags: tags, values: values) if OUTBOUND_METRICS
          else
            self.write_udp(series: direction, tags: tags, values: values)
          end
        end
      end
      if ZuoraConnect.configuration.telegraf_debug
        ZuoraConnect.logger.debug(self.format_metric_log('Telegraf', tags.to_s))
        ZuoraConnect.logger.debug(self.format_metric_log('Telegraf', values.to_s))
        ZuoraConnect.logger.debug(self.format_metric_log('Telegraf', "Writing '#{direction.capitalize}': #{time.real.round(5)} ms"))
      end
    end


    def write_udp(series: '', tags: {}, values: {})
      return if !values.present?
      self.host.write InfluxDB::PointValue.new({series: series, tags: tags, values: values}).dump
    rescue => ex
      self.connect
      ZuoraConnect.logger.warn(self.format_metric_log('Telegraf',"Failed to write udp: #{ex.class}")) if Rails.env.to_s != 'production'
    end

    def format_metric_log(message, dump = nil)
      message_color, dump_color = "1;91", "0;1"
      log_entry = "  \e[#{message_color}m#{message}\e[0m   "
      log_entry << "\e[#{dump_color}m%#{String === dump ? 's' : 'p'}\e[0m" % dump if dump
      if Rails.env == :development
        log_entry
      else
        [message, dump].compact.join(' - ')
      end
    end
  end
end