from django.utils.functional import cached_property
from rest_framework import mixins, viewsets
from rest_framework.filters import SearchFilter
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from apps.api.permissions import RBACPermission
from apps.api.serializers.team import TeamLongSerializer, TeamSerializer
from apps.auth_token.auth import PluginAuthentication
from apps.mobile_app.auth import MobileAppAuthTokenAuthentication
from apps.schedules.ical_utils import get_cached_oncall_users_for_multiple_schedules
from apps.user_management.models import Team
from common.api_helpers.filters import NO_TEAM_VALUE
from common.api_helpers.mixins import PublicPrimaryKeyMixin


class TeamViewSet(
    PublicPrimaryKeyMixin[Team],
    mixins.ListModelMixin,
    mixins.RetrieveModelMixin,
    mixins.UpdateModelMixin,
    viewsets.GenericViewSet,
):
    authentication_classes = (
        MobileAppAuthTokenAuthentication,
        PluginAuthentication,
    )
    permission_classes = (IsAuthenticated, RBACPermission)
    rbac_permissions = {
        "list": [RBACPermission.Permissions.OTHER_SETTINGS_READ],
        "retrieve": [RBACPermission.Permissions.OTHER_SETTINGS_READ],
        "update": [RBACPermission.Permissions.OTHER_SETTINGS_WRITE],
    }

    serializer_class = TeamSerializer
    filter_backends = [SearchFilter]
    search_fields = ["name"]

    def get_queryset(self):
        return self.request.user.available_teams

    def _is_long_request(self) -> bool:
        return self.request.query_params.get("short", "true").lower() == "false"

    @cached_property
    def schedules_with_oncall_users(self):
        """
        The result of this method is cached and is reused for the whole lifetime of a request,
        since self.get_serializer_context() is called multiple times for every instance in the queryset.
        """
        team_ids = [t.id for t in self.filter_queryset(self.get_queryset())]
        team_schedules = self.request.user.organization.oncall_schedules.filter(team__id__in=team_ids)
        return get_cached_oncall_users_for_multiple_schedules(team_schedules)

    def get_serializer_context(self):
        context = super().get_serializer_context()
        context.update(
            {"schedules_with_oncall_users": self.schedules_with_oncall_users if self._is_long_request() else {}}
        )
        return context

    def get_serializer_class(self):
        return TeamLongSerializer if self._is_long_request() else TeamSerializer

    def list(self, request, *args, **kwargs):
        general_team = [Team(public_primary_key=NO_TEAM_VALUE, name="No team", email=None, avatar_url=None)]
        queryset = self.filter_queryset(self.get_queryset())

        if self.request.query_params.get("only_include_notifiable_teams", "false") == "true":
            queryset = queryset.filter(
                pk__in=self.request.user.organization.get_notifiable_direct_paging_integrations()
                .filter(team__isnull=False)
                .values_list("team__pk", flat=True)
            )

        queryset = queryset.order_by("name")

        teams = list(queryset)
        if self.request.query_params.get("include_no_team", "true") != "false":
            # Adds general team to the queryset in a way that it always shows up first (even when not searched for).
            queryset = general_team + teams
        else:
            queryset = teams

        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)