from django.contrib.auth.models import Group, User
from django.contrib.contenttypes.models import ContentType
from rest_framework import serializers

from users.models import ObjectPermission
from utilities.api import ContentTypeField, SerializedPKRelatedField, ValidatedModelSerializer
from .nested_serializers import *


class UserSerializer(ValidatedModelSerializer):
    url = serializers.HyperlinkedIdentityField(view_name='users-api:user-detail')
    groups = SerializedPKRelatedField(
        queryset=Group.objects.all(),
        serializer=NestedGroupSerializer,
        required=False,
        many=True
    )

    class Meta:
        model = User
        fields = (
            'id', 'url', 'username', 'first_name', 'last_name', 'email', 'is_staff', 'is_active', 'date_joined',
            'groups',
        )


class GroupSerializer(ValidatedModelSerializer):
    url = serializers.HyperlinkedIdentityField(view_name='users-api:group-detail')
    user_count = serializers.IntegerField(read_only=True)

    class Meta:
        model = Group
        fields = ('id', 'url', 'name', 'user_count')


class ObjectPermissionSerializer(ValidatedModelSerializer):
    url = serializers.HyperlinkedIdentityField(view_name='users-api:objectpermission-detail')
    object_types = ContentTypeField(
        queryset=ContentType.objects.all(),
        many=True
    )
    groups = SerializedPKRelatedField(
        queryset=Group.objects.all(),
        serializer=NestedGroupSerializer,
        required=False,
        many=True
    )
    users = SerializedPKRelatedField(
        queryset=User.objects.all(),
        serializer=NestedUserSerializer,
        required=False,
        many=True
    )

    class Meta:
        model = ObjectPermission
        fields = ('id', 'url', 'name', 'enabled', 'object_types', 'groups', 'users', 'actions', 'constraints')