from django.contrib import admin
from django.contrib.auth.models import User as AuthUser
from django.contrib.contenttypes.models import ContentType
from django.core import checks, management
from django.db import DEFAULT_DB_ALIAS, models
from django.db.models import signals
from django.test import TestCase, override_settings
from django.test.utils import isolate_apps
from django.urls import reverse

from .admin import admin as force_admin_model_registration  # NOQA
from .models import (
    Abstract, BaseUser, Bug, Country, Improvement, Issue, LowerStatusPerson,
    MultiUserProxy, MyPerson, MyPersonProxy, OtherPerson, Person, ProxyBug,
    ProxyImprovement, ProxyProxyBug, ProxyTrackerUser, State, StateProxy,
    StatusPerson, TrackerUser, User, UserProxy, UserProxyProxy,
)


class ProxyModelTests(TestCase):
    def test_same_manager_queries(self):
        """
        The MyPerson model should be generating the same database queries as
        the Person model (when the same manager is used in each case).
        """
        my_person_sql = MyPerson.other.all().query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        person_sql = Person.objects.order_by("name").query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        self.assertEqual(my_person_sql, person_sql)

    def test_inheritance_new_table(self):
        """
        The StatusPerson models should have its own table (it's using ORM-level
        inheritance).
        """
        sp_sql = StatusPerson.objects.all().query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        p_sql = Person.objects.all().query.get_compiler(
            DEFAULT_DB_ALIAS).as_sql()
        self.assertNotEqual(sp_sql, p_sql)

    def test_basic_proxy(self):
        """
        Creating a Person makes them accessible through the MyPerson proxy.
        """
        person = Person.objects.create(name="Foo McBar")
        self.assertEqual(len(Person.objects.all()), 1)
        self.assertEqual(len(MyPerson.objects.all()), 1)
        self.assertEqual(MyPerson.objects.get(name="Foo McBar").id, person.id)
        self.assertFalse(MyPerson.objects.get(id=person.id).has_special_name())

    def test_no_proxy(self):
        """
        Person is not proxied by StatusPerson subclass.
        """
        Person.objects.create(name="Foo McBar")
        self.assertEqual(list(StatusPerson.objects.all()), [])

    def test_basic_proxy_reverse(self):
        """
        A new MyPerson also shows up as a standard Person.
        """
        MyPerson.objects.create(name="Bazza del Frob")
        self.assertEqual(len(MyPerson.objects.all()), 1)
        self.assertEqual(len(Person.objects.all()), 1)

        LowerStatusPerson.objects.create(status="low", name="homer")
        lsps = [lsp.name for lsp in LowerStatusPerson.objects.all()]
        self.assertEqual(lsps, ["homer"])

    def test_correct_type_proxy_of_proxy(self):
        """
        Correct type when querying a proxy of proxy
        """
        Person.objects.create(name="Foo McBar")
        MyPerson.objects.create(name="Bazza del Frob")
        LowerStatusPerson.objects.create(status="low", name="homer")
        pp = sorted(mpp.name for mpp in MyPersonProxy.objects.all())
        self.assertEqual(pp, ['Bazza del Frob', 'Foo McBar', 'homer'])

    def test_proxy_included_in_ancestors(self):
        """
        Proxy models are included in the ancestors for a model's DoesNotExist
        and MultipleObjectsReturned
        """
        Person.objects.create(name="Foo McBar")
        MyPerson.objects.create(name="Bazza del Frob")
        LowerStatusPerson.objects.create(status="low", name="homer")
        max_id = Person.objects.aggregate(max_id=models.Max('id'))['max_id']

        with self.assertRaises(Person.DoesNotExist):
            MyPersonProxy.objects.get(name='Zathras')
        with self.assertRaises(Person.MultipleObjectsReturned):
            MyPersonProxy.objects.get(id__lt=max_id + 1)
        with self.assertRaises(Person.DoesNotExist):
            StatusPerson.objects.get(name='Zathras')

        StatusPerson.objects.create(name='Bazza Jr.')
        StatusPerson.objects.create(name='Foo Jr.')
        max_id = Person.objects.aggregate(max_id=models.Max('id'))['max_id']

        with self.assertRaises(Person.MultipleObjectsReturned):
            StatusPerson.objects.get(id__lt=max_id + 1)

    def test_abstract_base_with_model_fields(self):
        msg = "Abstract base class containing model fields not permitted for proxy model 'NoAbstract'."
        with self.assertRaisesMessage(TypeError, msg):
            class NoAbstract(Abstract):
                class Meta:
                    proxy = True

    def test_too_many_concrete_classes(self):
        msg = "Proxy model 'TooManyBases' has more than one non-abstract model base class."
        with self.assertRaisesMessage(TypeError, msg):
            class TooManyBases(User, Person):
                class Meta:
                    proxy = True

    def test_no_base_classes(self):
        msg = "Proxy model 'NoBaseClasses' has no non-abstract model base class."
        with self.assertRaisesMessage(TypeError, msg):
            class NoBaseClasses(models.Model):
                class Meta:
                    proxy = True

    @isolate_apps('proxy_models')
    def test_new_fields(self):
        class NoNewFields(Person):
            newfield = models.BooleanField()

            class Meta:
                proxy = True

        errors = NoNewFields.check()
        expected = [
            checks.Error(
                "Proxy model 'NoNewFields' contains model fields.",
                id='models.E017',
            )
        ]
        self.assertEqual(errors, expected)

    @override_settings(TEST_SWAPPABLE_MODEL='proxy_models.AlternateModel')
    @isolate_apps('proxy_models')
    def test_swappable(self):
        class SwappableModel(models.Model):

            class Meta:
                swappable = 'TEST_SWAPPABLE_MODEL'

        class AlternateModel(models.Model):
            pass

        # You can't proxy a swapped model
        with self.assertRaises(TypeError):
            class ProxyModel(SwappableModel):

                class Meta:
                    proxy = True

    def test_myperson_manager(self):
        Person.objects.create(name="fred")
        Person.objects.create(name="wilma")
        Person.objects.create(name="barney")

        resp = [p.name for p in MyPerson.objects.all()]
        self.assertEqual(resp, ['barney', 'fred'])

        resp = [p.name for p in MyPerson._default_manager.all()]
        self.assertEqual(resp, ['barney', 'fred'])

    def test_otherperson_manager(self):
        Person.objects.create(name="fred")
        Person.objects.create(name="wilma")
        Person.objects.create(name="barney")

        resp = [p.name for p in OtherPerson.objects.all()]
        self.assertEqual(resp, ['barney', 'wilma'])

        resp = [p.name for p in OtherPerson.excluder.all()]
        self.assertEqual(resp, ['barney', 'fred'])

        resp = [p.name for p in OtherPerson._default_manager.all()]
        self.assertEqual(resp, ['barney', 'wilma'])

    def test_permissions_created(self):
        from django.contrib.auth.models import Permission
        Permission.objects.get(name="May display users information")

    def test_proxy_model_signals(self):
        """
        Test save signals for proxy models
        """
        output = []

        def make_handler(model, event):
            def _handler(*args, **kwargs):
                output.append('%s %s save' % (model, event))
            return _handler

        h1 = make_handler('MyPerson', 'pre')
        h2 = make_handler('MyPerson', 'post')
        h3 = make_handler('Person', 'pre')
        h4 = make_handler('Person', 'post')

        signals.pre_save.connect(h1, sender=MyPerson)
        signals.post_save.connect(h2, sender=MyPerson)
        signals.pre_save.connect(h3, sender=Person)
        signals.post_save.connect(h4, sender=Person)

        MyPerson.objects.create(name="dino")
        self.assertEqual(output, [
            'MyPerson pre save',
            'MyPerson post save'
        ])

        output = []

        h5 = make_handler('MyPersonProxy', 'pre')
        h6 = make_handler('MyPersonProxy', 'post')

        signals.pre_save.connect(h5, sender=MyPersonProxy)
        signals.post_save.connect(h6, sender=MyPersonProxy)

        MyPersonProxy.objects.create(name="pebbles")

        self.assertEqual(output, [
            'MyPersonProxy pre save',
            'MyPersonProxy post save'
        ])

        signals.pre_save.disconnect(h1, sender=MyPerson)
        signals.post_save.disconnect(h2, sender=MyPerson)
        signals.pre_save.disconnect(h3, sender=Person)
        signals.post_save.disconnect(h4, sender=Person)
        signals.pre_save.disconnect(h5, sender=MyPersonProxy)
        signals.post_save.disconnect(h6, sender=MyPersonProxy)

    def test_content_type(self):
        ctype = ContentType.objects.get_for_model
        self.assertIs(ctype(Person), ctype(OtherPerson))

    def test_user_proxy_models(self):
        User.objects.create(name='Bruce')

        resp = [u.name for u in User.objects.all()]
        self.assertEqual(resp, ['Bruce'])

        resp = [u.name for u in UserProxy.objects.all()]
        self.assertEqual(resp, ['Bruce'])

        resp = [u.name for u in UserProxyProxy.objects.all()]
        self.assertEqual(resp, ['Bruce'])

        self.assertEqual([u.name for u in MultiUserProxy.objects.all()], ['Bruce'])

    def test_proxy_for_model(self):
        self.assertEqual(UserProxy, UserProxyProxy._meta.proxy_for_model)

    def test_concrete_model(self):
        self.assertEqual(User, UserProxyProxy._meta.concrete_model)

    def test_proxy_delete(self):
        """
        Proxy objects can be deleted
        """
        User.objects.create(name='Bruce')
        u2 = UserProxy.objects.create(name='George')

        resp = [u.name for u in UserProxy.objects.all()]
        self.assertEqual(resp, ['Bruce', 'George'])

        u2.delete()

        resp = [u.name for u in UserProxy.objects.all()]
        self.assertEqual(resp, ['Bruce'])

    def test_proxy_update(self):
        user = User.objects.create(name='Bruce')
        with self.assertNumQueries(1):
            UserProxy.objects.filter(id=user.id).update(name='George')
        user.refresh_from_db()
        self.assertEqual(user.name, 'George')

    def test_select_related(self):
        """
        We can still use `select_related()` to include related models in our
        querysets.
        """
        country = Country.objects.create(name='Australia')
        State.objects.create(name='New South Wales', country=country)

        resp = [s.name for s in State.objects.select_related()]
        self.assertEqual(resp, ['New South Wales'])

        resp = [s.name for s in StateProxy.objects.select_related()]
        self.assertEqual(resp, ['New South Wales'])

        self.assertEqual(StateProxy.objects.get(name='New South Wales').name, 'New South Wales')

        resp = StateProxy.objects.select_related().get(name='New South Wales')
        self.assertEqual(resp.name, 'New South Wales')

    def test_filter_proxy_relation_reverse(self):
        tu = TrackerUser.objects.create(name='Contributor', status='contrib')
        ptu = ProxyTrackerUser.objects.get()
        issue = Issue.objects.create(assignee=tu)
        self.assertEqual(tu.issues.get(), issue)
        self.assertEqual(ptu.issues.get(), issue)
        self.assertSequenceEqual(TrackerUser.objects.filter(issues=issue), [tu])
        self.assertSequenceEqual(ProxyTrackerUser.objects.filter(issues=issue), [ptu])

    def test_proxy_bug(self):
        contributor = ProxyTrackerUser.objects.create(name='Contributor', status='contrib')
        someone = BaseUser.objects.create(name='Someone')
        Bug.objects.create(summary='fix this', version='1.1beta', assignee=contributor, reporter=someone)
        pcontributor = ProxyTrackerUser.objects.create(name='OtherContributor', status='proxy')
        Improvement.objects.create(
            summary='improve that', version='1.1beta',
            assignee=contributor, reporter=pcontributor,
            associated_bug=ProxyProxyBug.objects.all()[0],
        )

        # Related field filter on proxy
        resp = ProxyBug.objects.get(version__icontains='beta')
        self.assertEqual(repr(resp), '<ProxyBug: ProxyBug:fix this>')

        # Select related + filter on proxy
        resp = ProxyBug.objects.select_related().get(version__icontains='beta')
        self.assertEqual(repr(resp), '<ProxyBug: ProxyBug:fix this>')

        # Proxy of proxy, select_related + filter
        resp = ProxyProxyBug.objects.select_related().get(
            version__icontains='beta'
        )
        self.assertEqual(repr(resp), '<ProxyProxyBug: ProxyProxyBug:fix this>')

        # Select related + filter on a related proxy field
        resp = ProxyImprovement.objects.select_related().get(
            reporter__name__icontains='butor'
        )
        self.assertEqual(
            repr(resp),
            '<ProxyImprovement: ProxyImprovement:improve that>'
        )

        # Select related + filter on a related proxy of proxy field
        resp = ProxyImprovement.objects.select_related().get(
            associated_bug__summary__icontains='fix'
        )
        self.assertEqual(
            repr(resp),
            '<ProxyImprovement: ProxyImprovement:improve that>'
        )

    def test_proxy_load_from_fixture(self):
        management.call_command('loaddata', 'mypeople.json', verbosity=0)
        p = MyPerson.objects.get(pk=100)
        self.assertEqual(p.name, 'Elvis Presley')

    def test_eq(self):
        self.assertEqual(MyPerson(id=100), Person(id=100))


@override_settings(ROOT_URLCONF='proxy_models.urls')
class ProxyModelAdminTests(TestCase):

    @classmethod
    def setUpTestData(cls):
        cls.superuser = AuthUser.objects.create(is_superuser=True, is_staff=True)
        cls.tu1 = ProxyTrackerUser.objects.create(name='Django Pony', status='emperor')
        cls.i1 = Issue.objects.create(summary="Pony's Issue", assignee=cls.tu1)

    def test_cascade_delete_proxy_model_admin_warning(self):
        """
        Test if admin gives warning about cascade deleting models referenced
        to concrete model by deleting proxy object.
        """
        tracker_user = TrackerUser.objects.all()[0]
        base_user = BaseUser.objects.all()[0]
        issue = Issue.objects.all()[0]
        with self.assertNumQueries(6):
            collector = admin.utils.NestedObjects('default')
            collector.collect(ProxyTrackerUser.objects.all())
        self.assertIn(tracker_user, collector.edges.get(None, ()))
        self.assertIn(base_user, collector.edges.get(None, ()))
        self.assertIn(issue, collector.edges.get(tracker_user, ()))

    def test_delete_str_in_model_admin(self):
        """
        Test if the admin delete page shows the correct string representation
        for a proxy model.
        """
        user = TrackerUser.objects.get(name='Django Pony')
        proxy = ProxyTrackerUser.objects.get(name='Django Pony')

        user_str = 'Tracker user: <a href="%s">%s</a>' % (
            reverse('admin_proxy:proxy_models_trackeruser_change', args=(user.pk,)), user
        )
        proxy_str = 'Proxy tracker user: <a href="%s">%s</a>' % (
            reverse('admin_proxy:proxy_models_proxytrackeruser_change', args=(proxy.pk,)), proxy
        )

        self.client.force_login(self.superuser)
        response = self.client.get(reverse('admin_proxy:proxy_models_trackeruser_delete', args=(user.pk,)))
        delete_str = response.context['deleted_objects'][0]
        self.assertEqual(delete_str, user_str)
        response = self.client.get(reverse('admin_proxy:proxy_models_proxytrackeruser_delete', args=(proxy.pk,)))
        delete_str = response.context['deleted_objects'][0]
        self.assertEqual(delete_str, proxy_str)
