from celery.utils.log import get_task_logger

from apps.alerts.tasks import notify_ical_schedule_shift  # type: ignore[no-redef]
from apps.schedules.ical_utils import is_icals_equal, update_cached_oncall_users_for_schedule
from apps.schedules.tasks import (
    check_gaps_and_empty_shifts_in_schedule,
    notify_about_empty_shifts_in_schedule_task,
    notify_about_gaps_in_schedule_task,
)
from apps.slack.tasks import start_update_slack_user_group_for_schedules
from common.custom_celery_tasks import shared_dedicated_queue_retry_task

task_logger = get_task_logger(__name__)


@shared_dedicated_queue_retry_task()
def start_refresh_ical_files():
    from apps.schedules.models import OnCallSchedule

    task_logger.info("Start refresh ical files")

    schedules = OnCallSchedule.objects.filter(organization__deleted_at__isnull=True)
    for schedule in schedules:
        refresh_ical_file.apply_async((schedule.pk,))

    # Update Slack user groups with a delay to make sure all the schedules are refreshed
    start_update_slack_user_group_for_schedules.apply_async(countdown=30)


@shared_dedicated_queue_retry_task()
def start_refresh_ical_final_schedules():
    from apps.schedules.models import OnCallSchedule

    task_logger.info("Start refresh ical final schedules")

    schedules = OnCallSchedule.objects.filter(organization__deleted_at__isnull=True)
    for schedule in schedules:
        refresh_ical_final_schedule.apply_async((schedule.pk,))


@shared_dedicated_queue_retry_task()
def refresh_ical_file(schedule_pk):
    from apps.schedules.models import OnCallSchedule

    task_logger.info(f"Refresh ical files for schedule {schedule_pk}")

    try:
        schedule = OnCallSchedule.objects.get(pk=schedule_pk)
    except OnCallSchedule.DoesNotExist:
        task_logger.info(f"Tried to refresh non-existing schedule {schedule_pk}")
        return

    schedule.refresh_ical_file()
    if schedule.slack_channel is not None:
        notify_ical_schedule_shift.apply_async((schedule.pk,))

    run_task_primary = False
    if schedule.cached_ical_file_primary:
        # ie. primary schedule is not empty (None -> no ical, "" -> empty cached value)
        if not schedule.prev_ical_file_primary:
            # prev value is empty
            run_task_primary = True
            task_logger.info(f"run_task_primary {schedule_pk} {run_task_primary} prev_ical_file_primary is None")
        else:
            # prev value is not empty, we need to compare
            run_task_primary = not is_icals_equal(
                schedule.cached_ical_file_primary,
                schedule.prev_ical_file_primary,
            )
            task_logger.info(f"run_task_primary {schedule_pk} {run_task_primary} icals not equal")

    run_task_overrides = False
    if schedule.cached_ical_file_overrides:
        # ie. overrides schedule is not empty (None -> no ical, "" -> empty cached value)
        if not schedule.prev_ical_file_overrides:
            # prev value is empty
            run_task_overrides = True
            task_logger.info(f"run_task_overrides {schedule_pk} {run_task_primary} prev_ical_file_overrides is None")
        else:
            # prev value is not empty, we need to compare
            run_task_overrides = not is_icals_equal(
                schedule.cached_ical_file_overrides,
                schedule.prev_ical_file_overrides,
            )
            task_logger.info(f"run_task_overrides {schedule_pk} {run_task_primary} icals not equal")
    run_task = run_task_primary or run_task_overrides

    # update cached schedule on-call users
    update_cached_oncall_users_for_schedule(schedule)

    check_gaps_and_empty_shifts_in_schedule.apply_async((schedule_pk,))
    # todo: refactor tasks below to unify checking and notifying about gaps and empty shifts to avoid doing the same
    # todo: work twice.
    if run_task:
        notify_about_empty_shifts_in_schedule_task.apply_async((schedule_pk,))
        notify_about_gaps_in_schedule_task.apply_async((schedule_pk,))


@shared_dedicated_queue_retry_task()
def refresh_ical_final_schedule(schedule_pk):
    from apps.schedules.models import OnCallSchedule

    task_logger.info(f"Refresh ical final schedule {schedule_pk}")

    try:
        schedule = OnCallSchedule.objects.get(pk=schedule_pk)
    except OnCallSchedule.DoesNotExist:
        task_logger.info(f"Tried to refresh final schedule for non-existing schedule {schedule_pk}")
        return

    schedule.refresh_ical_final_schedule()