text: import logging
  import random
  import threading
  import time
  from typing import List, Iterator
  
  from .alarm import Alarm
  from .server import Server, get_zone_state_event_type
  from .zone import Zone
  from ...event import SystemStatusEvent, ArmingUpdate, ZoneUpdate, StatusUpdate
  
  _LOGGER = logging.getLogger(__name__)
  
  
  class AlarmServer():
      def __init__(self, host: str, port: int):
          self._alarm = Alarm.create(
              num_zones=8,
              alarm_state_changed=self._alarm_state_changed,
              zone_state_changed=self._zone_state_changed,
          )
          self._server = Server(handle_command=self._handle_command)
          self._host = host
          self._port = port
          self._simulation_running = False
  
      def start(self) -> None:
          self._server.start(host=self._host, port=self._port)
          self._start_simulation()
  
          while True:
              command = input("Command: ")
              if command is None:
                  continue
  
              command = command.upper().strip()
              if command == "D":
                  self._alarm.disarm()
              elif command == "A":
                  self._alarm.arm()
              elif command == "T":
                  self._alarm.trip()
  
              print(command)
  
      def _alarm_state_changed(self, previous_state: Alarm.ArmingState,
                               state: Alarm.ArmingState) -> None:
          if state != Alarm.ArmingState.DISARMED:
              self._stop_simulation()
  
          for event_type in get_events_for_state_update(previous_state, state):
              event = SystemStatusEvent(
                  type=event_type,
                  zone=0x00,
                  area=0x00,
                  timestamp=None,
                  address=0
              )
              self._server.write_event(event)
  
      def _zone_state_changed(self, zone_id: int, state: Zone.State) -> None:
          event = SystemStatusEvent(
              type=get_zone_state_event_type(state),
              zone=zone_id,
              area=0,
              timestamp=None,
              address=0
          )
          self._server.write_event(event)
  
      def _handle_command(self, command: str) -> None:
          _LOGGER.info("Incoming User Command: {}".format(command))
          if command == 'AE' or command == 'A1234E':
              self._alarm.arm()
          elif command == '1234E':
              self._alarm.disarm()
          elif command == 'S00':
              self._handle_zone_input_unsealed_status_update_request()
          elif command == 'S14':
              self._handle_arming_status_update_request()
  
      def _handle_arming_status_update_request(self) -> None:
          event = ArmingUpdate(
              status=get_arming_status(self._alarm.state),
              address=0x00,
              timestamp=None,
          )
          self._server.write_event(event)
  
      def _handle_zone_input_unsealed_status_update_request(self) -> None:
          event = ZoneUpdate(
              request_id=StatusUpdate.RequestID.ZONE_INPUT_UNSEALED,
              included_zones=[
                  get_zone_for_id(z.id) for z in
                  self._alarm.zones if z.state == Zone.State.UNSEALED],
              address=0x00,
              timestamp=None,
          )
          self._server.write_event(event)
  
      def _simulate_zone_events(self) -> None:
          while self._simulation_running:
              zone: Zone = random.choice(self._alarm.zones)
              self._alarm.update_zone(zone.id, toggled_state(zone.state))
              _LOGGER.info("Toggled zone: %s", zone)
              time.sleep(random.randint(1, 5))
  
      def _stop_simulation(self) -> None:
          self._simulation_running = False
  
      def _start_simulation(self) -> None:
          if not self._simulation_running:
              self._simulation_running = True
              threading.Thread(target=self._simulate_zone_events).start()
  
  
  def get_events_for_state_update(
          previous_state: Alarm.ArmingState,
          state: Alarm.ArmingState) -> Iterator[SystemStatusEvent.EventType]:
  
      if state == Alarm.ArmingState.DISARMED:
          yield SystemStatusEvent.EventType.DISARMED
      if state == Alarm.ArmingState.EXIT_DELAY:
          yield SystemStatusEvent.EventType.ARMED_AWAY
          yield SystemStatusEvent.EventType.EXIT_DELAY_START
  
      if state == Alarm.ArmingState.TRIPPED:
          yield SystemStatusEvent.EventType.ALARM
  
      # When state transitions from EXIT_DELAY, trigger EXIT_DELAY_END.
      if (previous_state == Alarm.ArmingState.EXIT_DELAY and state != previous_state or
              state == Alarm.ArmingState.ARMED_AWAY):
          yield SystemStatusEvent.EventType.EXIT_DELAY_END
  
      if state == Alarm.ArmingState.ENTRY_DELAY:
          yield SystemStatusEvent.EventType.ENTRY_DELAY_START
  
      # When state transitions from ENTRY_DELAY, trigger ENTRY_DELAY_END
      if previous_state == Alarm.ArmingState.ENTRY_DELAY and state != previous_state:
          yield SystemStatusEvent.EventType.ENTRY_DELAY_END
  
  
  def get_arming_status(state: Alarm.ArmingState) -> List[ArmingUpdate.ArmingStatus]:
      if state == Alarm.ArmingState.ARMED_AWAY:
          return [
              ArmingUpdate.ArmingStatus.AREA_1_ARMED,
              ArmingUpdate.ArmingStatus.AREA_1_FULLY_ARMED
          ]
      elif state == Alarm.ArmingState.EXIT_DELAY:
          return [ArmingUpdate.ArmingStatus.AREA_1_ARMED]
      else:
          return []
  
  
  def toggled_state(state: Zone.State) -> Zone.State:
      if state == Zone.State.SEALED:
          return Zone.State.UNSEALED
      else:
          return Zone.State.SEALED
  
  
  def get_zone_for_id(zone_id: int) -> ZoneUpdate.Zone:
      key = 'ZONE_{}'.format(zone_id)
      return ZoneUpdate.Zone[key]
  