play-json 에서 scala3 enum 사용하기

import play.api.libs.json.{Format, JsValue, Json}

enum Age {
  case Old, Young
}

case class Person(name: String, age: Option[Age])

object Person {
  given Format[Age] = summon[Format[String]].bimap[Age](s => Age.valueOf(s), age => age.toString)
  given Format[Person] = Json.format[Person]
}

@main def Main(): Unit = {
  import Age.*
  val person = Person("KIM", Some(Young))

  val js: JsValue = Json.toJson(person)
  val s: String = js.toString

  val js2: JsValue = Json.parse(s)
  val p: Person = js2.as[Person]
  println(p)
}