FullExample.scala

object ResponseDemo:

  import javax.ws.rs.core.Response
  
  trait HttpResponse[A]:
    extension (a: A) def response: Response

  object HttpResponse:

    given stringResponse : HttpResponse[String] with
      extension (str: String) 
        def response: Response = Response.status(Response.Status.OK).entity(str).build 

    given optHttpResponse[T : HttpResponse]: HttpResponse[Option[T]] with
      extension (opt: Option[T])
        def response: Response =
          opt match
            case  None => Response.status(404).build()
            case Some(t) => summon[HttpResponse[T]].response(t)

end ResponseDemo

object Test2 extends App:
   
   import ResponseDemo.HttpResponse.stringResponse
   
   println("all is good".response)

   val someValue: Option[String] = Some("all is good")

   import ResponseDemo.HttpResponse.optHttpResponse
   println(someValue.response) 

   val noValue: Option[String] = None
   println(noValue.response)