# ~*~ coding: utf-8 ~*~
from __future__ import absolute_import, unicode_literals
from datetime import timedelta

from django.db import transaction
from django.db.models import Q
from django.conf import settings
from celery import shared_task
from common.utils import get_logger
from common.utils.timezone import now
from users.models import User
from perms.models import RebuildUserTreeTask, AssetPermission
from perms.utils.user_asset_permission import rebuild_user_mapping_nodes_if_need_with_lock, lock

logger = get_logger(__file__)


@shared_task(queue='node_tree')
def rebuild_user_mapping_nodes_celery_task(user_id):
    user = User.objects.get(id=user_id)
    try:
        rebuild_user_mapping_nodes_if_need_with_lock(user)
    except lock.SomeoneIsDoingThis:
        pass


@shared_task(queue='node_tree')
def dispatch_mapping_node_tasks():
    user_ids = RebuildUserTreeTask.objects.all().values_list('user_id', flat=True).distinct()
    logger.info(f'>>> dispatch_mapping_node_tasks for users {list(user_ids)}')
    for id in user_ids:
        rebuild_user_mapping_nodes_celery_task.delay(id)


@shared_task(queue='check_asset_perm_expired')
def check_asset_permission_expired():
    """
    这里的任务要足够短，不要影响周期任务
    """
    periodic = settings.PERM_EXPIRED_CHECK_PERIODIC
    end = now()
    start = end - timedelta(seconds=periodic * 1.2)
    ids = AssetPermission.objects.filter(
        date_expired__gt=start, date_expired__lt=end
    ).distinct().values_list('id', flat=True)
    logger.info(f'>>> checking {start} to {end} have {ids} expired')
    dispatch_process_expired_asset_permission.delay(ids)


@shared_task(queue='node_tree')
def dispatch_process_expired_asset_permission(asset_perm_ids):
    user_ids = User.objects.filter(
        Q(assetpermissions__id__in=asset_perm_ids) |
        Q(groups__assetpermissions__id__in=asset_perm_ids)
    ).distinct().values_list('id', flat=True)
    RebuildUserTreeTask.objects.bulk_create(
        [RebuildUserTreeTask(user_id=user_id) for user_id in user_ids]
    )

    dispatch_mapping_node_tasks.delay()


def create_rebuild_user_tree_task(user_ids):
    RebuildUserTreeTask.objects.bulk_create(
        [RebuildUserTreeTask(user_id=i) for i in user_ids]
    )
    transaction.on_commit(dispatch_mapping_node_tasks.delay)