from django.db.transaction import on_commit
from orgs.models import Organization
from orgs.tasks import refresh_org_cache_task
from orgs.utils import current_org, tmp_to_org

from common.cache import Cache, IntegerField
from common.utils import get_logger
from users.models import UserGroup, User
from assets.models import Node, SystemUser, Domain, Gateway, Asset
from terminal.models import Session
from applications.models import Application
from perms.models import AssetPermission, ApplicationPermission

logger = get_logger(__file__)


class OrgRelatedCache(Cache):

    def __init__(self):
        super().__init__()
        self.current_org = Organization.get_instance(current_org.id)

    def get_current_org(self):
        """
        暴露给子类控制组织的回调
        1. 在交互式环境下能控制组织
        2. 在 celery 任务下能控制组织
        """
        return self.current_org

    def compute_values(self, *fields):
        with tmp_to_org(self.get_current_org()):
            return super().compute_values(*fields)

    def refresh_async(self, *fields):
        """
        在事务提交之后再发送信号，防止因事务的隔离性导致未获得最新的数据
        """
        def func():
            logger.debug(f'CACHE: Send refresh task {self}.{fields}')
            refresh_org_cache_task.delay(self, *fields)
        on_commit(func)

    def expire(self, *fields):
        def func():
            super(OrgRelatedCache, self).expire(*fields)
        on_commit(func)


class OrgResourceStatisticsCache(OrgRelatedCache):
    users_amount = IntegerField()
    groups_amount = IntegerField(queryset=UserGroup.objects)

    assets_amount = IntegerField()
    nodes_amount = IntegerField(queryset=Node.objects)
    admin_users_amount = IntegerField()
    system_users_amount = IntegerField()
    domains_amount = IntegerField(queryset=Domain.objects)
    gateways_amount = IntegerField(queryset=Gateway.objects)

    applications_amount = IntegerField(queryset=Application.objects)

    asset_perms_amount = IntegerField(queryset=AssetPermission.objects)
    app_perms_amount = IntegerField(queryset=ApplicationPermission.objects)

    total_count_online_users = IntegerField()
    total_count_online_sessions = IntegerField()

    def __init__(self, org):
        super().__init__()
        self.org = org

    def get_key_suffix(self):
        return f'org_{self.org.id}'

    def get_current_org(self):
        return self.org

    def compute_admin_users_amount(self):
        return SystemUser.objects.filter(type=SystemUser.Type.admin).count()

    def compute_system_users_amount(self):
        return SystemUser.objects.filter(type=SystemUser.Type.common).count()

    def compute_users_amount(self):
        amount = User.get_org_users(self.org).count()
        return amount

    def compute_assets_amount(self):
        if self.org.is_root():
            return Asset.objects.all().count()
        node = Node.org_root()
        return node.assets_amount

    def compute_total_count_online_users(self):
        return Session.objects.filter(is_finished=False).values_list('user_id').distinct().count()

    def compute_total_count_online_sessions(self):
        return Session.objects.filter(is_finished=False).count()