/**
 * Generated by API Builder - https://www.apibuilder.io
 * Service version: 0.0.5-dev
 * User agent: apibuilder app.apibuilder.io/michal/state-example/0.0.5-dev/ning_1_8_client
 */
package io.github.mkows.state.example.v0.models {

  sealed trait ItemState extends _root_.scala.Product with _root_.scala.Serializable {
    def itemStateType: ItemStateType

  }

  /**
   * Defines the valid type values for the type ItemState
   */
  sealed trait ItemStateType extends _root_.scala.Product with _root_.scala.Serializable

  object ItemStateType {

    case object ItemStateProgress extends ItemStateType { override def toString = "item_state_progress" }
    case object ItemStateFailedCause extends ItemStateType { override def toString = "item_state_failed_cause" }

    final case class UNDEFINED(override val toString: String) extends ItemStateType

    val all: scala.List[ItemStateType] = scala.List(ItemStateProgress, ItemStateFailedCause)

    private val byName: Map[String, ItemStateType] = all.map(x => x.toString.toLowerCase -> x).toMap

    def apply(value: String): ItemStateType = fromString(value).getOrElse(UNDEFINED(value))

    def fromString(value: String): _root_.scala.Option[ItemStateType] = byName.get(value.toLowerCase)

  }
  final case class Error(
    code: Int,
    message: String,
    details: _root_.scala.Option[String] = None
  )

  final case class Healthcheck(
    status: String
  )

  /**
   * Provides future compatibility in clients - in the future, when a type is added
   * to the union ItemState, it will need to be handled in the client code. This
   * implementation will deserialize these future types as an instance of this class.
   *
   * @param description Information about the type that we received that is undefined in this version of
   *        the client.
   */

  final case class ItemStateUndefinedType(
    description: String
  ) extends ItemState {
    override val itemStateType: ItemStateType = ItemStateType.UNDEFINED(description)
  }
  sealed trait ItemStateFailedCause extends ItemState

  object ItemStateFailedCause {

    case object ErrorCause1 extends ItemStateFailedCause {
      override def toString = "ErrorCause1"
      override val itemStateType: ItemStateType = ItemStateType.ItemStateFailedCause
    }
    case object ErrorCause2 extends ItemStateFailedCause {
      override def toString = "ErrorCause2"
      override val itemStateType: ItemStateType = ItemStateType.ItemStateFailedCause
    }
    case object ErrorCause3 extends ItemStateFailedCause {
      override def toString = "ErrorCause3"
      override val itemStateType: ItemStateType = ItemStateType.ItemStateFailedCause
    }
    /**
     * UNDEFINED captures values that are sent either in error or
     * that were added by the server after this library was
     * generated. We want to make it easy and obvious for users of
     * this library to handle this case gracefully.
     *
     * We use all CAPS for the variable name to avoid collisions
     * with the camel cased values above.
     */
    final case class UNDEFINED(override val toString: String) extends ItemStateFailedCause {
      override val itemStateType: ItemStateType = ItemStateType.ItemStateFailedCause
    }

    /**
     * all returns a list of all the valid, known values. We use
     * lower case to avoid collisions with the camel cased values
     * above.
     */
    val all: scala.List[ItemStateFailedCause] = scala.List(ErrorCause1, ErrorCause2, ErrorCause3)

    private
    val byName: Map[String, ItemStateFailedCause] = all.map(x => x.toString.toLowerCase -> x).toMap

    def apply(value: String): ItemStateFailedCause = fromString(value).getOrElse(UNDEFINED(value))

    def fromString(value: String): _root_.scala.Option[ItemStateFailedCause] = byName.get(value.toLowerCase)

  }

  sealed trait ItemStateProgress extends ItemState

  object ItemStateProgress {

    case object Init extends ItemStateProgress {
      override def toString = "Init"
      override val itemStateType: ItemStateType = ItemStateType.ItemStateProgress
    }
    case object Pending extends ItemStateProgress {
      override def toString = "Pending"
      override val itemStateType: ItemStateType = ItemStateType.ItemStateProgress
    }
    case object Completed extends ItemStateProgress {
      override def toString = "Completed"
      override val itemStateType: ItemStateType = ItemStateType.ItemStateProgress
    }
    /**
     * UNDEFINED captures values that are sent either in error or
     * that were added by the server after this library was
     * generated. We want to make it easy and obvious for users of
     * this library to handle this case gracefully.
     *
     * We use all CAPS for the variable name to avoid collisions
     * with the camel cased values above.
     */
    final case class UNDEFINED(override val toString: String) extends ItemStateProgress {
      override val itemStateType: ItemStateType = ItemStateType.ItemStateProgress
    }

    /**
     * all returns a list of all the valid, known values. We use
     * lower case to avoid collisions with the camel cased values
     * above.
     */
    val all: scala.List[ItemStateProgress] = scala.List(Init, Pending, Completed)

    private
    val byName: Map[String, ItemStateProgress] = all.map(x => x.toString.toLowerCase -> x).toMap

    def apply(value: String): ItemStateProgress = fromString(value).getOrElse(UNDEFINED(value))

    def fromString(value: String): _root_.scala.Option[ItemStateProgress] = byName.get(value.toLowerCase)

  }

}

package io.github.mkows.state.example.v0.models {

  package object json {
    import play.api.libs.json.__
    import play.api.libs.json.JsString
    import play.api.libs.json.Writes
    import play.api.libs.functional.syntax._
    import io.github.mkows.state.example.v0.models.json._

    private[v0] implicit val jsonReadsUUID: play.api.libs.json.Reads[_root_.java.util.UUID] = __.read[String].map { str =>
      _root_.java.util.UUID.fromString(str)
    }

    private[v0] implicit val jsonWritesUUID: play.api.libs.json.Writes[_root_.java.util.UUID] = (x: _root_.java.util.UUID) => play.api.libs.json.JsString(x.toString)

    private[v0] implicit val jsonReadsJodaDateTime: play.api.libs.json.Reads[_root_.org.joda.time.DateTime] = __.read[String].map { str =>
      _root_.org.joda.time.format.ISODateTimeFormat.dateTimeParser.parseDateTime(str)
    }

    private[v0] implicit val jsonWritesJodaDateTime: play.api.libs.json.Writes[_root_.org.joda.time.DateTime] = (x: _root_.org.joda.time.DateTime) => {
      play.api.libs.json.JsString(_root_.org.joda.time.format.ISODateTimeFormat.dateTime.print(x))
    }

    private[v0] implicit val jsonReadsJodaLocalDate: play.api.libs.json.Reads[_root_.org.joda.time.LocalDate] = __.read[String].map { str =>
      _root_.org.joda.time.format.ISODateTimeFormat.dateTimeParser.parseLocalDate(str)
    }

    private[v0] implicit val jsonWritesJodaLocalDate: play.api.libs.json.Writes[_root_.org.joda.time.LocalDate] = (x: _root_.org.joda.time.LocalDate) => {
      play.api.libs.json.JsString(_root_.org.joda.time.format.ISODateTimeFormat.date.print(x))
    }

    implicit val jsonReadsStateExampleItemStateFailedCause: play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.ItemStateFailedCause] = new play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.ItemStateFailedCause] {
      def reads(js: play.api.libs.json.JsValue): play.api.libs.json.JsResult[io.github.mkows.state.example.v0.models.ItemStateFailedCause] = {
        js match {
          case v: play.api.libs.json.JsString => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateFailedCause(v.value))
          case _ => {
            (js \ "value").validate[String] match {
              case play.api.libs.json.JsSuccess(v, _) => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateFailedCause(v))
              case err: play.api.libs.json.JsError =>
                (js \ "item_state_failed_cause").validate[String] match {
                  case play.api.libs.json.JsSuccess(v, _) => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateFailedCause(v))
                  case err: play.api.libs.json.JsError => err
                }
            }
          }
        }
      }
    }

    def jsonWritesStateExampleItemStateFailedCause(obj: io.github.mkows.state.example.v0.models.ItemStateFailedCause) = {
      play.api.libs.json.JsString(obj.toString)
    }

    def jsObjectItemStateFailedCause(obj: io.github.mkows.state.example.v0.models.ItemStateFailedCause) = {
      play.api.libs.json.Json.obj("type" -> "item_state_failed_cause", "value" -> play.api.libs.json.JsString(obj.toString))
    }

    implicit def jsonWritesStateExampleItemStateFailedCause: play.api.libs.json.Writes[ItemStateFailedCause] = {
      (obj: io.github.mkows.state.example.v0.models.ItemStateFailedCause) => {
        io.github.mkows.state.example.v0.models.json.jsObjectItemStateFailedCause(obj)
      }
    }

    implicit val jsonReadsStateExampleItemStateProgress: play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.ItemStateProgress] = new play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.ItemStateProgress] {
      def reads(js: play.api.libs.json.JsValue): play.api.libs.json.JsResult[io.github.mkows.state.example.v0.models.ItemStateProgress] = {
        js match {
          case v: play.api.libs.json.JsString => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateProgress(v.value))
          case _ => {
            (js \ "value").validate[String] match {
              case play.api.libs.json.JsSuccess(v, _) => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateProgress(v))
              case err: play.api.libs.json.JsError =>
                (js \ "item_state_progress").validate[String] match {
                  case play.api.libs.json.JsSuccess(v, _) => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateProgress(v))
                  case err: play.api.libs.json.JsError => err
                }
            }
          }
        }
      }
    }

    def jsonWritesStateExampleItemStateProgress(obj: io.github.mkows.state.example.v0.models.ItemStateProgress) = {
      play.api.libs.json.JsString(obj.toString)
    }

    def jsObjectItemStateProgress(obj: io.github.mkows.state.example.v0.models.ItemStateProgress) = {
      play.api.libs.json.Json.obj("type" -> "item_state_progress", "value" -> play.api.libs.json.JsString(obj.toString))
    }

    implicit def jsonWritesStateExampleItemStateProgress: play.api.libs.json.Writes[ItemStateProgress] = {
      (obj: io.github.mkows.state.example.v0.models.ItemStateProgress) => {
        io.github.mkows.state.example.v0.models.json.jsObjectItemStateProgress(obj)
      }
    }

    implicit def jsonReadsStateExampleError: play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.Error] = {
      for {
        code <- (__ \ "code").read[Int]
        message <- (__ \ "message").read[String]
        details <- (__ \ "details").readNullable[String]
      } yield Error(code, message, details)
    }

    def jsObjectError(obj: io.github.mkows.state.example.v0.models.Error): play.api.libs.json.JsObject = {
      play.api.libs.json.Json.obj(
        "code" -> play.api.libs.json.JsNumber(obj.code),
        "message" -> play.api.libs.json.JsString(obj.message)
      ) ++ (obj.details match {
        case None => play.api.libs.json.Json.obj()
        case Some(x) => play.api.libs.json.Json.obj("details" -> play.api.libs.json.JsString(x))
      })
    }

    implicit def jsonWritesStateExampleError: play.api.libs.json.Writes[Error] = {
      (obj: io.github.mkows.state.example.v0.models.Error) => {
        io.github.mkows.state.example.v0.models.json.jsObjectError(obj)
      }
    }

    implicit def jsonReadsStateExampleHealthcheck: play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.Healthcheck] = {
      (__ \ "status").read[String].map { x => Healthcheck(status = x) }
    }

    def jsObjectHealthcheck(obj: io.github.mkows.state.example.v0.models.Healthcheck): play.api.libs.json.JsObject = {
      play.api.libs.json.Json.obj(
        "status" -> play.api.libs.json.JsString(obj.status)
      )
    }

    implicit def jsonWritesStateExampleHealthcheck: play.api.libs.json.Writes[Healthcheck] = {
      (obj: io.github.mkows.state.example.v0.models.Healthcheck) => {
        io.github.mkows.state.example.v0.models.json.jsObjectHealthcheck(obj)
      }
    }

    implicit def jsonReadsStateExampleItemState: play.api.libs.json.Reads[io.github.mkows.state.example.v0.models.ItemState] = (js: play.api.libs.json.JsValue) => {
      def readDiscriminator(discriminator: String) = {
        discriminator match {
          case "item_state_progress" => io.github.mkows.state.example.v0.models.json.jsonReadsStateExampleItemStateProgress.reads(js)
          case "item_state_failed_cause" => io.github.mkows.state.example.v0.models.json.jsonReadsStateExampleItemStateFailedCause.reads(js)
          case other => play.api.libs.json.JsSuccess(io.github.mkows.state.example.v0.models.ItemStateUndefinedType(other))
        }
      }
      (js \ "type").validate[String] match {
        case e: play.api.libs.json.JsError => e
        case s: play.api.libs.json.JsSuccess[String] => readDiscriminator(s.value)
      }
    }

    def jsObjectItemState(obj: io.github.mkows.state.example.v0.models.ItemState): play.api.libs.json.JsObject = {
      obj match {
        case x: io.github.mkows.state.example.v0.models.ItemStateProgress => io.github.mkows.state.example.v0.models.json.jsObjectItemStateProgress(x)
        case x: io.github.mkows.state.example.v0.models.ItemStateFailedCause => io.github.mkows.state.example.v0.models.json.jsObjectItemStateFailedCause(x)
        case other => {
          sys.error(s"The type[${other.getClass.getName}] has no JSON writer")
        }
      }
    }
    implicit def jsonWritesStateExampleItemState: play.api.libs.json.Writes[ItemState] = {
      (obj: io.github.mkows.state.example.v0.models.ItemState) => {
        io.github.mkows.state.example.v0.models.json.jsObjectItemState(obj)
      }
    }
  }
}



package io.github.mkows.state.example.v0 {
  import com.ning.http.client.{AsyncCompletionHandler, AsyncHttpClient, Realm, Request, RequestBuilder, Response, AsyncHttpClientConfig}

  object Constants {

    val BaseUrl = "https://mkows.github.io"
    val Namespace = "io.github.mkows.state.example.v0"
    val UserAgent = "apibuilder app.apibuilder.io/michal/state-example/0.0.5-dev/ning_1_8_client"
    val Version = "0.0.5-dev"
    val VersionMajor = 0

  }

  class Client(
    val baseUrl: String = "https://mkows.github.io",
    auth: scala.Option[io.github.mkows.state.example.v0.Authorization] = None,
    defaultHeaders: Seq[(String, String)] = Nil,
    asyncHttpClient: AsyncHttpClient = Client.defaultAsyncHttpClient
  ) extends interfaces.Client {
    import org.slf4j.{Logger, LoggerFactory}
    import io.github.mkows.state.example.v0.models.json._

    def closeAsyncHttpClient(): Unit = {
      asyncHttpClient.close()
    }

    val logger = LoggerFactory.getLogger(getClass)

    def healthchecks: Healthchecks = Healthchecks

    object Healthchecks extends Healthchecks {
      override def get(
        requestHeaders: Seq[(String, String)] = Nil
      )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[io.github.mkows.state.example.v0.models.Healthcheck] = {
        _executeRequest("GET", s"/_internal_/healthcheck", requestHeaders = requestHeaders).map {
          case r if r.getStatusCode == 200 => _root_.io.github.mkows.state.example.v0.Client.parseJson("io.github.mkows.state.example.v0.models.Healthcheck", r, _.validate[io.github.mkows.state.example.v0.models.Healthcheck])
          case r => throw io.github.mkows.state.example.v0.errors.FailedRequest(r.getStatusCode, s"Unsupported response code[${r.getStatusCode}]. Expected: 200", requestUri = Some(r.getUri))
        }
      }

      override def postTestFormParamsJson(
        param1: String,
        requestHeaders: Seq[(String, String)] = Nil
      )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[Unit] = {
        val payload = play.api.libs.json.Json.obj(
          "param1" -> play.api.libs.json.Json.toJson(param1)
        )

        _executeRequest("POST", s"/_internal_/healthcheck/test_form_params_json", body = Some(payload), requestHeaders = requestHeaders).map {
          case r if r.getStatusCode == 204 => ()
          case r => throw io.github.mkows.state.example.v0.errors.FailedRequest(r.getStatusCode, s"Unsupported response code[${r.getStatusCode}]. Expected: 204", requestUri = Some(r.getUri))
        }
      }

      override def getById(
        id: Int,
        requestHeaders: Seq[(String, String)] = Nil
      )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[io.github.mkows.state.example.v0.models.Healthcheck] = {
        _executeRequest("GET", s"/_internal_/healthcheck/${id}", requestHeaders = requestHeaders).map {
          case r if r.getStatusCode == 200 => _root_.io.github.mkows.state.example.v0.Client.parseJson("io.github.mkows.state.example.v0.models.Healthcheck", r, _.validate[io.github.mkows.state.example.v0.models.Healthcheck])
          case r if r.getStatusCode == 400 => throw io.github.mkows.state.example.v0.errors.ErrorResponse(r)
          case r if r.getStatusCode == 401 => throw io.github.mkows.state.example.v0.errors.UnitResponse(r.getStatusCode)
          case r if r.getStatusCode == 403 => throw io.github.mkows.state.example.v0.errors.ValueResponse(r)
          case r if r.getStatusCode == 404 => throw io.github.mkows.state.example.v0.errors.UnitResponse(r.getStatusCode)
          case r => throw io.github.mkows.state.example.v0.errors.FailedRequest(r.getStatusCode, s"Unsupported response code[${r.getStatusCode}]. Expected: 200, 400, 401, 403, 404", requestUri = Some(r.getUri))
        }
      }
    }

    def _logRequest(request: Request): Unit = {
      if (logger.isInfoEnabled) {
        logger.info("_logRequest: " + request)
      }
    }

    def _logResponse(response: Response): Unit = {
      if (logger.isInfoEnabled) {
        logger.info("_logResponse: status=" + response.getStatusCode + ", responseBody: " + response.getResponseBody("UTF-8"))
      }
    }

    def _requestBuilder(method: String, path: String, requestHeaders: Seq[(String, String)]): RequestBuilder = {
      val builder = new RequestBuilder(method)
        .setUrl(baseUrl + path)
        .addHeader("User-Agent", Constants.UserAgent)
        .addHeader("X-Apidoc-Version", Constants.Version)
        .addHeader("X-Apidoc-Version-Major", Constants.VersionMajor.toString)

      defaultHeaders.foreach { h => builder.addHeader(h._1, h._2) }
      requestHeaders.foreach { h => builder.addHeader(h._1, h._2) }

      auth.fold(builder) {
        case Authorization.Basic(username, passwordOpt) => {
          builder.setRealm(
            new Realm.RealmBuilder()
              .setPrincipal(username)
              .setPassword(passwordOpt.getOrElse(""))
              .setUsePreemptiveAuth(true)
              .setScheme(Realm.AuthScheme.BASIC)
              .build()
          )
        }
        case a => sys.error("Invalid authorization scheme[" + a.getClass + "]")
      }
    }

    def _executeRequest(
      method: String,
      path: String,
      queryParameters: Seq[(String, String)] = Nil,
      requestHeaders: Seq[(String, String)] = Nil,
      body: Option[play.api.libs.json.JsValue] = None
    )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[com.ning.http.client.Response] = {
      val allHeaders = body match {
        case None => requestHeaders
        case Some(_) => _withJsonContentType(requestHeaders)
      }

      val request = _requestBuilder(method, path, allHeaders)

      queryParameters.foreach { pair =>
        request.addQueryParameter(pair._1, pair._2)
      }

      val requestWithParamsAndBody = body.fold(request) { b =>
        val serialized = play.api.libs.json.Json.stringify(b)
        request.setBody(serialized)
      }

      val finalRequest = requestWithParamsAndBody.build()
      _logRequest(finalRequest)

      val result = scala.concurrent.Promise[com.ning.http.client.Response]()
      asyncHttpClient.executeRequest(finalRequest,
        new AsyncCompletionHandler[Unit]() {
          override def onCompleted(r: com.ning.http.client.Response) = {
            _logResponse(r)
            result.success(r)
          }
          override def onThrowable(t: Throwable) = result.failure(t)
        }
      )
      result.future
    }

    /**
     * Adds a Content-Type: application/json header unless the specified requestHeaders
     * already contain a Content-Type header
     */
    def _withJsonContentType(headers: Seq[(String, String)]): Seq[(String, String)] = {
      headers.find { _._1.toUpperCase == "CONTENT-TYPE" } match {
        case None => headers ++ Seq(("Content-Type" -> "application/json; charset=UTF-8"))
        case Some(_) => headers
      }
    }

  }

  object Client {

    private lazy val defaultAsyncHttpClient = {
      new AsyncHttpClient(
        new AsyncHttpClientConfig.Builder()
          .setExecutorService(java.util.concurrent.Executors.newCachedThreadPool())
          .build()
      )
    }

    def parseJson[T](
      className: String,
      r: _root_.com.ning.http.client.Response,
      f: (play.api.libs.json.JsValue => play.api.libs.json.JsResult[T])
    ): T = {
      f(play.api.libs.json.Json.parse(r.getResponseBody("UTF-8"))) match {
        case play.api.libs.json.JsSuccess(x, _) => x
        case play.api.libs.json.JsError(errors) => {
          throw io.github.mkows.state.example.v0.errors.FailedRequest(r.getStatusCode, s"Invalid json for class[" + className + "]: " + errors.mkString(" "), requestUri = Some(r.getUri))
        }
      }
    }

  }

  sealed trait Authorization extends _root_.scala.Product with _root_.scala.Serializable
  object Authorization {
    final case class Basic(username: String, password: Option[String] = None) extends Authorization
  }

  package interfaces {

    trait Client {
      def baseUrl: String
      def healthchecks: io.github.mkows.state.example.v0.Healthchecks
    }

  }

  trait Healthchecks {
    def get(
      requestHeaders: Seq[(String, String)] = Nil
    )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[io.github.mkows.state.example.v0.models.Healthcheck]

    def postTestFormParamsJson(
      param1: String,
      requestHeaders: Seq[(String, String)] = Nil
    )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[Unit]

    def getById(
      id: Int,
      requestHeaders: Seq[(String, String)] = Nil
    )(implicit ec: scala.concurrent.ExecutionContext): scala.concurrent.Future[io.github.mkows.state.example.v0.models.Healthcheck]
  }

  package errors {

    import io.github.mkows.state.example.v0.models.json._

    final case class ErrorResponse(
      response: _root_.com.ning.http.client.Response,
      message: Option[String] = None
    ) extends Exception(message.getOrElse(s"${response.getStatusCode}: ${response.getResponseBody("UTF-8")}")) {
      lazy val error = _root_.io.github.mkows.state.example.v0.Client.parseJson("io.github.mkows.state.example.v0.models.Error", response, _.validate[io.github.mkows.state.example.v0.models.Error])
    }

    final case class UnitResponse(status: Int) extends Exception(s"HTTP $status")

    final case class ValueResponse(
      response: _root_.com.ning.http.client.Response,
      message: Option[String] = None
    ) extends Exception(message.getOrElse(s"${response.getStatusCode}: ${response.getResponseBody("UTF-8")}")) {
      lazy val value = _root_.io.github.mkows.state.example.v0.Client.parseJson("String", response, _.validate[String])
    }

    final case class FailedRequest(responseCode: Int, message: String, requestUri: Option[_root_.java.net.URI] = None) extends _root_.java.lang.Exception(s"HTTP $responseCode: $message")

  }

  object PathSegment {
    // See https://github.com/playframework/playframework/blob/2.3.x/framework/src/play/src/main/scala/play/utils/UriEncoding.scala
    def encode(s: String, inputCharset: String): String = {
      val in = s.getBytes(inputCharset)
      val out = new java.io.ByteArrayOutputStream()
      for (b <- in) {
        val allowed = segmentChars.get(b & 0xFF)
        if (allowed) {
          out.write(b)
        } else {
          out.write('%')
          out.write(upperHex((b >> 4) & 0xF))
          out.write(upperHex(b & 0xF))
        }
      }
      out.toString("US-ASCII")
    }

    private def upperHex(x: Int): Int = {
      // Assume 0 <= x < 16
      if (x < 10) (x + '0') else (x - 10 + 'A')
    }

    private val segmentChars: java.util.BitSet = membershipTable(pchar)

    private def pchar: Seq[Char] = {
      val alphaDigit = for ((min, max) <- Seq(('a', 'z'), ('A', 'Z'), ('0', '9')); c <- min to max) yield c
      val unreserved = alphaDigit ++ Seq('-', '.', '_', '~')
      val subDelims = Seq('!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '=')
      unreserved ++ subDelims ++ Seq(':', '@')
    }

    private def membershipTable(chars: Seq[Char]): java.util.BitSet = {
      val bits = new java.util.BitSet(256)
      for (c <- chars) { bits.set(c.toInt) }
      bits
    }
  }
}