from django.db import models
from rest_framework import permissions, serializers
from backend.models.university import University
from django.contrib.postgres.fields import JSONField
from backend.models.my_model import MyModel, MyModelSerializer, MyModelViewSet
from django.contrib.auth.models import User
from backend.models.tools import NoDelete, IsOwner


class UserData(MyModel):
    owner = models.OneToOneField(User, on_delete=models.CASCADE)
    contact_info = JSONField(default=dict)
    contact_info_is_public = models.BooleanField(default=False)
    config = JSONField(default=dict)
    black_list = models.ManyToManyField(
        University, related_name='+', blank=True)
    other_data = JSONField(default=dict)


class UserDataSerializer(MyModelSerializer):
    owner = serializers.CharField(read_only=True)

    def my_pre_save(self):
        user = self.get_user_in_request()
        self.override_validated_data({'owner': user})

        # we try to recover the correct instance
        query = UserData.objects.filter(owner=user)
        if len(query) == 1:
            self.instance = query[0]

    class Meta:
        model = UserData
        fields = '__all__'
        NEVER_MODERATE = True


class UserDataViewSet(MyModelViewSet):
    permission_classes = (
        permissions.IsAuthenticated,
        NoDelete,
        IsOwner
    )
    serializer_class = UserDataSerializer

    def get_queryset(self):
        return UserData.objects.filter(owner=self.request.user)  # pylint: disable=E1101