from datetime import datetime

from django.db import transaction
from django.utils import timezone

from django_q.tasks import async_task
from django_q.models import Schedule

from cmsmanage.django_q2_helper import ensure_scheduled
from doorcontrol.models import Door, HIDEvent


@transaction.atomic()
def getMessages(door: Door):
    last_event = door.hidevent_set.order_by("timestamp").last()
    if last_event is not None:
        last_ts = timezone.make_naive(last_event.timestamp)
    else:
        last_ts = datetime(2010, 1, 1)

    retrieved_message_count = 0
    created_message_count = 0
    for events_page in door.controller.get_events(last_ts):
        print(f"Importing {len(events_page)} events for {door.name}")
        created_messages = HIDEvent.objects.bulk_create(
            (HIDEvent.from_xml_attributes(door, event.attrib) for event in events_page),
            ignore_conflicts=True,
        )

        retrieved_message_count += len(events_page)
        created_message_count += len(created_messages)

    return {
        "retrieved": retrieved_message_count,
        "created": created_message_count,
    }


def q_getMessagesAllDoors():
    # TODO: this should probably use async_iter
    for door in Door.objects.all():
        async_task(
            getMessages,
            door,
            cluster="internal",
            group=f"Fetch HID Events - {door.name}",
        )


def schedule_tasks():
    ensure_scheduled(
        "Fetch HID Events",
        q_getMessagesAllDoors,
        schedule_type=Schedule.MINUTES,
        minutes=15,
    )