import unittest

from django.contrib.auth import authenticate
from django.core import mail
from django.test import TestCase

from oscar.core.compat import get_user_model

User = get_user_model()


class TestEmailAuthBackend(TestCase):
    def test_authenticates_multiple_users(self):
        password = "lookmanohands"
        users = [
            User.objects.create_user(email, email, password=password)
            for email in ["user1@example.com", "user2@example.com"]
        ]
        for created_user in users:
            user = authenticate(username=created_user.email, password=password)
            self.assertEqual(user, created_user)

    def test_authenticates_different_email_spelling(self):
        email = password = "person@example.com"
        created_user = User.objects.create_user("user1", email, password=password)

        for email_variation in [
            "Person@example.com",
            "Person@EXAMPLE.COM",
            "person@Example.com",
        ]:
            user = authenticate(username=email_variation, password=password)
            self.assertEqual(user, created_user)


# Skip these tests for now as they only make sense when there isn't a unique
# index on the user class.  The test suite currently uses a custom model that
# *does* have a unique index on email.  When I figure out how to swap the user
# model per test, we can re-enable this testcase.
@unittest.skip
class TestEmailAuthBackendWhenUsersShareAnEmail(TestCase):
    def test_authenticates_when_passwords_are_different(self):
        # Create two users with the same email address
        email = "person@example.com"
        for username in ["user1", "user2"]:
            User.objects.create_user(username, email, password=username)

        user = authenticate(username=email, password="user1")
        self.assertTrue(user is not None)

    def test_rejects_when_passwords_match(self):
        # Create two users with the same email address
        email = "person@example.com"
        for username in ["user1", "user2"]:
            User.objects.create_user(username, email, password="password")

        user = authenticate(username=email, password="password")
        self.assertTrue(user is None)

    def test_mails_admins_when_passwords_match(self):
        # Create two users with the same email address
        email = "person@example.com"
        for username in ["user1", "user2"]:
            User.objects.create_user(username, email, password="password")

        authenticate(username=email, password="password")
        self.assertEqual(1, len(mail.outbox))