from django.contrib.auth import get_user_model
from django.test.utils import override_settings

from allauth.account import app_settings
from allauth.account.auth_backends import AuthenticationBackend
from allauth.tests import TestCase


class AuthenticationBackendTests(TestCase):
    def setUp(self):
        user = get_user_model().objects.create(
            is_active=True, email="john@example.com", username="john"
        )
        user.set_password(user.username)
        user.save()
        self.user = user

    @override_settings(
        ACCOUNT_AUTHENTICATION_METHOD=app_settings.AuthenticationMethod.USERNAME
    )  # noqa
    def test_auth_by_username(self):
        user = self.user
        backend = AuthenticationBackend()
        self.assertEqual(
            backend.authenticate(
                request=None, username=user.username, password=user.username
            ).pk,
            user.pk,
        )
        self.assertEqual(
            backend.authenticate(
                request=None, username=user.email, password=user.username
            ),
            None,
        )

    @override_settings(
        ACCOUNT_AUTHENTICATION_METHOD=app_settings.AuthenticationMethod.EMAIL
    )  # noqa
    def test_auth_by_email(self):
        user = self.user
        backend = AuthenticationBackend()
        self.assertEqual(
            backend.authenticate(
                request=None, username=user.email, password=user.username
            ).pk,
            user.pk,
        )
        self.assertEqual(
            backend.authenticate(
                request=None, username=user.username, password=user.username
            ),
            None,
        )

    @override_settings(
        ACCOUNT_AUTHENTICATION_METHOD=app_settings.AuthenticationMethod.USERNAME_EMAIL
    )  # noqa
    def test_auth_by_username_or_email(self):
        user = self.user
        backend = AuthenticationBackend()
        self.assertEqual(
            backend.authenticate(
                request=None, username=user.email, password=user.username
            ).pk,
            user.pk,
        )
        self.assertEqual(
            backend.authenticate(
                request=None, username=user.username, password=user.username
            ).pk,
            user.pk,
        )