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zio.metrics.connectors.newrelic

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package zio.metrics.connectors

import zio._
import zio.http.Client
import zio.metrics.connectors.internal.MetricsClient

package object newrelic {

  lazy val newRelicLayer: ZLayer[MetricsConfig & NewRelicConfig, Nothing, Unit] =
    ZLayer.makeSome[MetricsConfig & NewRelicConfig, Unit](
      make,
      Client.default.orDie,
    )

  private lazy val make: URLayer[MetricsConfig & NewRelicConfig & Client, Unit] = ZLayer(for {
    encoder <- newRelicEncoder
    client  <- NewRelicClient.make
    handler  = newRelicHandler(encoder, client)
    _       <- MetricsClient.make(handler)
  } yield ())

  private lazy val newRelicEncoder =
    Clock.instant.map(NewRelicEncoder.apply)

  private def newRelicHandler(
    encoder: NewRelicEncoder,
    client: NewRelicClient,
  ): Iterable[MetricEvent] => UIO[Unit] = events => {
    val evtFilter: MetricEvent => Boolean = {
      case MetricEvent.Unchanged(_, _, _) => false
      case _                              => true
    }

    val send = ZIO
      .foreachDiscard(events.filter(evtFilter))(evt =>
        for {
          encoded <- encoder.encode(evt).catchAll(_ => ZIO.succeed(Chunk.empty))
          _       <- ZIO.when(encoded.nonEmpty)(client.send(encoded))
        } yield (),
      )

    send

  }

}