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package org.apache.james.jmap.change

import org.apache.james.core.Username
import org.apache.james.events.Event.EventId
import org.apache.james.jmap.api.change.{State => JavaState}
import org.apache.james.jmap.core.{AccountId, OutboundMessage, PushState, State, StateChange}
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import reactor.core.publisher.Sinks
import reactor.core.publisher.Sinks.EmitFailureHandler
import reactor.core.scala.publisher.SMono
import reactor.core.scheduler.Schedulers

class StateChangeListenerTest {
  private val mailboxState = State.fromStringUnchecked("2f9f1b12-b35a-43e6-9af2-0106fb53a943")
  private val emailState = State.fromStringUnchecked("2d9f1b12-b35a-43e6-9af2-0106fb53a943")
  private val eventId = EventId.of("6e0dd59d-660e-4d9b-b22f-0354479f47b4")

  @Test
  def reactiveEventShouldSendAnOutboundMessage(): Unit = {
    val sink: Sinks.Many[OutboundMessage] = Sinks.many().unicast().onBackpressureBuffer()
    val event = StateChangeEvent(eventId = eventId,
      username = Username.of("bob"),
      mailboxState = Some(mailboxState),
      emailState = Some(emailState),
      vacationResponseState = None,
      emailDeliveryState = None)
    val listener = StateChangeListener(Set(MailboxTypeName, EmailTypeName), sink)

    SMono(listener.reactiveEvent(event)).subscribeOn(Schedulers.elastic()).block()
    sink.emitComplete(EmitFailureHandler.FAIL_FAST)

    val globalState = PushState.from(JavaState.of(mailboxState.value), JavaState.of(emailState.value))
    assertThat(sink.asFlux().collectList().block())
      .containsExactly(StateChange(Map(AccountId.from(Username.of("bob")).toOption.get  -> TypeState(Map(
        MailboxTypeName -> mailboxState,
        EmailTypeName -> emailState))), Some(globalState)))
  }

  @Test
  def reactiveEventShouldOmitUnwantedTypes(): Unit = {
    val sink: Sinks.Many[OutboundMessage] = Sinks.many().unicast().onBackpressureBuffer()
    val event = StateChangeEvent(eventId = eventId,
      username = Username.of("bob"),
      mailboxState = Some(mailboxState),
      emailState = Some(emailState),
      vacationResponseState = None,
      emailDeliveryState = None)
    val listener = StateChangeListener(Set(MailboxTypeName), sink)

    SMono(listener.reactiveEvent(event)).subscribeOn(Schedulers.elastic()).block()
    sink.emitComplete(EmitFailureHandler.FAIL_FAST)

    val globalState = PushState.from(JavaState.of(mailboxState.value), JavaState.of(emailState.value))
    assertThat(sink.asFlux().collectList().block())
      .containsExactly(StateChange(Map(AccountId.from(Username.of("bob")).toOption.get -> TypeState(Map(
        MailboxTypeName -> mailboxState))), Some(globalState)))
  }

  @Test
  def reactiveEventShouldFilterOutUnwantedEvents(): Unit = {
    val sink: Sinks.Many[OutboundMessage] = Sinks.many().unicast().onBackpressureBuffer()
    val event = StateChangeEvent(eventId = eventId,
      username = Username.of("bob"),
      mailboxState = None,
      emailState = Some(emailState),
      vacationResponseState = None,
      emailDeliveryState = None)
    val listener = StateChangeListener(Set(MailboxTypeName), sink)

    SMono(listener.reactiveEvent(event)).subscribeOn(Schedulers.elastic()).block()
    sink.emitComplete(EmitFailureHandler.FAIL_FAST)

    assertThat(sink.asFlux().collectList().block())
      .isEmpty()
  }
}
