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@RestController
@RequestMapping("/api/admin/channel")
class AdminChannelController(private val actorSystem: ActorSystem<MainStageActorCommand>,
                             private val supervisorChannelActor: ActorRef<SupervisorChannelCommand>) {

    private val timeout: Duration = Duration.ofSeconds(5)

    @PostMapping("/add-counselor-manager")
    fun addCounselorManager(@RequestParam channel: String): CompletionStage<String>? {
        return AskPattern.ask(
            supervisorChannelActor,
            { replyTo: ActorRef<SupervisorChannelResponse> -> CreateCounselorManager(channel, replyTo) },
            timeout,
            actorSystem.scheduler()
        ).thenApply { response ->
            when (response) {
                is CounselorManagerCreated -> "Counselor Manager for channel $channel created successfully."
                is SupervisorErrorStringResponse -> response.message
                else -> "Unknown error occurred."
            }
        }
    }

    @GetMapping("/list-counselor-managers")
    fun listCounselorManagers(): CompletionStage<List<String>>? {
        return AskPattern.ask(
            supervisorChannelActor,
            { replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
            timeout,
            actorSystem.scheduler()
        ).thenApply { response ->
            when (response) {
                is AllCounselorManagers -> response.channels
                else -> emptyList()
            }
        }
    }

    @GetMapping("/list-counselor-managers-stream")
    fun listCounselorManagersByStream(): CompletionStage<List<String>> {
        return Source.single(Unit)
            .mapAsync(1) {
                AskPattern.ask(
                    supervisorChannelActor,
                    { replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
                    timeout,
                    actorSystem.scheduler()
                )
            }
            .runWith(Sink.head(), actorSystem)
            .thenApply { response ->
                when (response) {
                    is AllCounselorManagers -> response.channels
                    else -> emptyList()
                }
            }
    }

    @GetMapping("/list-counselor-managers-async")
    fun listCounselorManagersByCoroutines(): List<String> {
        val response = AkkaUtils.runBlockingAsk(
            supervisorChannelActor,
            { replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
            timeout, actorSystem
        )

        return when (response) {
            is AllCounselorManagers -> response.channels
            else -> emptyList()
        }
    }

    @GetMapping("/list-counselor-managers-mono")
    fun listCounselorManagersByMono(): Mono<List<String>> {
        return AkkaUtils.askActorByMono(
            supervisorChannelActor,
            { replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
            timeout,
            actorSystem
        ).map { response ->
            when (response) {
                is AllCounselorManagers -> response.channels
                else -> emptyList()
            }
        }
    }

package com.example.kotlinbootlabs.module

import akka.actor.typed.ActorRef
import akka.actor.typed.ActorSystem
import akka.actor.typed.javadsl.AskPattern
import java.time.Duration
import kotlinx.coroutines.future.await
import kotlinx.coroutines.runBlocking

object AkkaUtils {
    suspend fun <T, R> askActor(
        actor: ActorRef<T>,
        message: (ActorRef<R>) -> T,
        timeout: Duration,
        actorSystem: ActorSystem<*>
    ): R {
        return AskPattern.ask(
            actor,
            message,
            timeout,
            actorSystem.scheduler()
        ).await()
    }

    fun <T, R> runBlockingAsk(
        actor: ActorRef<T>,
        message: (ActorRef<R>) -> T,
        timeout: Duration,
        actorSystem: ActorSystem<*>
    ): R = runBlocking {
        askActor(actor, message, timeout, actorSystem)
    }


    fun <T, R> askActorByMono(
        actor: ActorRef<T>,
        message: (ActorRef<R>) -> T,
        timeout: Duration,
        actorSystem: ActorSystem<*>
    ): Mono<R> {
        return Mono.fromCompletionStage(
            AskPattern.ask(
                actor,
                message,
                timeout,
                actorSystem.scheduler()
            )
        )
    }


}