export const layer = <
  const ClientOnly extends boolean = false,
  const Storage extends "local" | "sql" | "byo" = never
>(
  options?: {
    readonly serialization?: "msgpack" | "ndjson" | undefined
    readonly clientOnly?: ClientOnly | undefined
    readonly storage?: Storage | undefined
    readonly runnerHealth?: "ping" | "k8s" | undefined
    readonly runnerHealthK8s?: {
      readonly namespace?: string | undefined
      readonly labelSelector?: string | undefined
    } | undefined
    readonly shardingConfig?: Partial<ShardingConfig.ShardingConfig["Service"]> | undefined
  }
): ClientOnly extends true ? Layer.Layer<
    Sharding | Runners.Runners | ("byo" extends Storage ? never : MessageStorage.MessageStorage),
    ConfigError,
    "local" extends Storage ? never
      : "byo" extends Storage ? (MessageStorage.MessageStorage | RunnerStorage.RunnerStorage)
      : SqlClient
  > :
  Layer.Layer<
    Sharding | Runners.Runners | ("byo" extends Storage ? never : MessageStorage.MessageStorage),
    SocketServer.SocketServerError | ConfigError,
    "local" extends Storage ? never
      : "byo" extends Storage ? (MessageStorage.MessageStorage | RunnerStorage.RunnerStorage)
      : SqlClient
  > =>
{
  const layer: Layer.Layer<any, any, any> = options?.clientOnly
    // client only
    ? Layer.provide(SocketRunner.layerClientOnly, layerClientProtocol)
    // with server
    : Layer.provide(SocketRunner.layer, [layerSocketServer, layerClientProtocol])

  const runnerHealth: Layer.Layer<any, any, any> = options?.clientOnly
    ? Layer.empty as any
    : options?.runnerHealth === "k8s"
    ? RunnerHealth.layerK8s(options.runnerHealthK8s).pipe(
      Layer.provide(layerK8sHttpClient)
    )
    : RunnerHealth.layerPing.pipe(
      Layer.provide(Runners.layerRpc),
      Layer.provide(layerClientProtocol)
    )

  return layer.pipe(
    Layer.provide(runnerHealth),
    Layer.provideMerge(
      options?.storage === "local"
        ? MessageStorage.layerNoop
        : options?.storage === "byo"
        ? Layer.empty
        : Layer.orDie(SqlMessageStorage.layer)
    ),
    Layer.provide(
      options?.storage === "local"
        ? RunnerStorage.layerMemory
        : options?.storage === "byo"
        ? Layer.empty
        : Layer.orDie(SqlRunnerStorage.layer)
    ),
    Layer.provide(ShardingConfig.layerFromEnv(options?.shardingConfig)),
    Layer.provide(
      options?.serialization === "ndjson" ? RpcSerialization.layerNdjson : RpcSerialization.layerMsgPack
    )
  ) as any
}