from django.contrib.auth import authenticate
from django.contrib.auth.context_processors import PermLookupDict, PermWrapper
from django.contrib.auth.models import Permission, User
from django.contrib.contenttypes.models import ContentType
from django.db.models import Q
from django.test import SimpleTestCase, TestCase, override_settings

from .settings import AUTH_MIDDLEWARE, AUTH_TEMPLATES


class MockUser:
    def __repr__(self):
        return 'MockUser()'

    def has_module_perms(self, perm):
        return perm == 'mockapp'

    def has_perm(self, perm, obj=None):
        return perm == 'mockapp.someperm'


class PermWrapperTests(SimpleTestCase):
    """
    Test some details of the PermWrapper implementation.
    """
    class EQLimiterObject:
        """
        This object makes sure __eq__ will not be called endlessly.
        """
        def __init__(self):
            self.eq_calls = 0

        def __eq__(self, other):
            if self.eq_calls > 0:
                return True
            self.eq_calls += 1
            return False

    def test_repr(self):
        perms = PermWrapper(MockUser())
        self.assertEqual(repr(perms), 'PermWrapper(MockUser())')

    def test_permwrapper_in(self):
        """
        'something' in PermWrapper works as expected.
        """
        perms = PermWrapper(MockUser())
        # Works for modules and full permissions.
        self.assertIn('mockapp', perms)
        self.assertNotIn('nonexistent', perms)
        self.assertIn('mockapp.someperm', perms)
        self.assertNotIn('mockapp.nonexistent', perms)

    def test_permlookupdict_in(self):
        """
        No endless loops if accessed with 'in' - refs #18979.
        """
        pldict = PermLookupDict(MockUser(), 'mockapp')
        with self.assertRaises(TypeError):
            self.EQLimiterObject() in pldict

    def test_iter(self):
        with self.assertRaisesMessage(TypeError, 'PermWrapper is not iterable.'):
            iter(PermWrapper(MockUser()))


@override_settings(ROOT_URLCONF='auth_tests.urls', TEMPLATES=AUTH_TEMPLATES)
class AuthContextProcessorTests(TestCase):
    """
    Tests for the ``django.contrib.auth.context_processors.auth`` processor
    """

    @classmethod
    def setUpTestData(cls):
        cls.superuser = User.objects.create_superuser(username='super', password='secret', email='super@example.com')

    @override_settings(MIDDLEWARE=AUTH_MIDDLEWARE)
    def test_session_not_accessed(self):
        """
        The session is not accessed simply by including
        the auth context processor
        """
        response = self.client.get('/auth_processor_no_attr_access/')
        self.assertContains(response, "Session not accessed")

    @override_settings(MIDDLEWARE=AUTH_MIDDLEWARE)
    def test_session_is_accessed(self):
        """
        The session is accessed if the auth context processor
        is used and relevant attributes accessed.
        """
        response = self.client.get('/auth_processor_attr_access/')
        self.assertContains(response, "Session accessed")

    def test_perms_attrs(self):
        u = User.objects.create_user(username='normal', password='secret')
        u.user_permissions.add(
            Permission.objects.get(
                content_type=ContentType.objects.get_for_model(Permission),
                codename='add_permission'))
        self.client.force_login(u)
        response = self.client.get('/auth_processor_perms/')
        self.assertContains(response, "Has auth permissions")
        self.assertContains(response, "Has auth.add_permission permissions")
        self.assertNotContains(response, "nonexistent")

    def test_perm_in_perms_attrs(self):
        u = User.objects.create_user(username='normal', password='secret')
        u.user_permissions.add(
            Permission.objects.get(
                content_type=ContentType.objects.get_for_model(Permission),
                codename='add_permission'))
        self.client.login(username='normal', password='secret')
        response = self.client.get('/auth_processor_perm_in_perms/')
        self.assertContains(response, "Has auth permissions")
        self.assertContains(response, "Has auth.add_permission permissions")
        self.assertNotContains(response, "nonexistent")

    def test_message_attrs(self):
        self.client.force_login(self.superuser)
        response = self.client.get('/auth_processor_messages/')
        self.assertContains(response, "Message 1")

    def test_user_attrs(self):
        """
        The lazy objects returned behave just like the wrapped objects.
        """
        # These are 'functional' level tests for common use cases.  Direct
        # testing of the implementation (SimpleLazyObject) is in the 'utils'
        # tests.
        self.client.login(username='super', password='secret')
        user = authenticate(username='super', password='secret')
        response = self.client.get('/auth_processor_user/')
        self.assertContains(response, "unicode: super")
        self.assertContains(response, "id: %d" % self.superuser.pk)
        self.assertContains(response, "username: super")
        # bug #12037 is tested by the {% url %} in the template:
        self.assertContains(response, "url: /userpage/super/")

        # A Q() comparing a user and with another Q() (in an AND or OR fashion).
        Q(user=response.context['user']) & Q(someflag=True)

        # Tests for user equality.  This is hard because User defines
        # equality in a non-duck-typing way
        # See bug #12060
        self.assertEqual(response.context['user'], user)
        self.assertEqual(user, response.context['user'])