from django.contrib.auth import get_user_model
from django.core.exceptions import ValidationError
from django.test import TestCase, modify_settings, override_settings
from rest_framework.exceptions import ErrorDetail

from dj_rest_auth.serializers import UserDetailsSerializer


User = get_user_model()


def validate_is_lower(username: str):
    if username.islower():
        return username
    raise ValidationError('username must be lower case')


custom_username_validators = [validate_is_lower]
validator_path = 'dj_rest_auth.tests.test_serializers.custom_username_validators'


class TestUserDetailsSerializer(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.user = User.objects.create_user(
            username='alice', email='alice@test.com', first_name='Alice',
        )

    @override_settings(ACCOUNT_USERNAME_VALIDATORS=validator_path)
    def test_validate_username_with_all_auth_failure(self):
        serializer = UserDetailsSerializer(
            self.user, data={'username': 'TestUsername'}, partial=True,
        )
        self.assertEqual(False, serializer.is_valid())
        self.assertEqual(
            serializer.errors,
            {
                'username': [
                    ErrorDetail(string='username must be lower case', code='invalid'),
                ],
            },
        )

    @override_settings(ACCOUNT_USERNAME_VALIDATORS=validator_path)
    def test_validate_username_with_all_auth_success(self):
        serializer = UserDetailsSerializer(
            self.user, data={'username': 'test_username'}, partial=True,
        )
        self.assertEqual(True, serializer.is_valid())
        self.assertEqual(serializer.validated_data, {'username': 'test_username'})

    @modify_settings(INSTALLED_APPS={'remove': ['allauth', 'allauth.account']})
    @override_settings(ACCOUNT_USERNAME_VALIDATORS=validator_path)
    def test_validate_username_without_all_auth(self):
        serializer = UserDetailsSerializer(
            self.user, data={'username': 'TestUsername'}, partial=True,
        )
        self.assertEqual(True, serializer.is_valid())
        self.assertEqual(serializer.validated_data, {'username': 'TestUsername'})