ca.kt

import org.apache.activemq.command.ActiveMQTextMessage
import org.springframework.context.event.EventListener
import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import org.springframework.jms.core.JmsTemplate
import org.springframework.jms.core.MessageCreator
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.PostMapping
import javax.jms.Queue
import javax.jms.TextMessage

// rest infra
internal class RestController(private val useCase: UseCase, private val presenter: JsonPresenter) {
    @PostMapping
    fun callSomething(body: String): ResponseEntity<*> {
        return useCase.doStuff(UseCaseRequest(body), presenter)
    }
}

data class JsonResult (val jsonValue: String)

@Component
internal class JsonPresenter : Presenter<ResponseEntity<*>> {
    override fun present(value: UseCaseResult) = ResponseEntity.ok(JsonResult(value.value))
    
    @ExceptionHandler(UserException::class.java)
    fun handleUserException(userException: UserException) = ResponseEntity.status(HttpStatus.BAD_REQUEST).body(failReason)
}

class UserException(failReason: String) : RuntimeException

// app api
data class UseCaseRequest (val value: String)
data class UseCaseResult (val value: String)
interface Presenter<T> {
    fun present(value: UseCaseResult) : T
}
interface UseCase {
    <T> fun doStuff(request: UseCaseRequest, presenter: Presenter<T>) : T
}

// app impl (ommitted interface)
internal class UseCaseImpl : UseCase {
    override <T> fun doStuff(request: UseCaseRequest, presenter: Presenter<T>) : T {
        if (request.value == "shizzle"){
            throw new UserException("We don't take no shizzle")
        }
        presenter.present(UseCaseResult("Shizzle 4 life"))
    }
}