from django.contrib import admin
from django.contrib.admin.sites import AdminSite
from django.contrib.auth.models import Permission, User
from django.contrib.contenttypes.admin import GenericTabularInline
from django.contrib.contenttypes.models import ContentType
from django.forms.formsets import DEFAULT_MAX_NUM
from django.forms.models import ModelForm
from django.test import RequestFactory, SimpleTestCase, TestCase, override_settings
from django.urls import reverse

from .admin import MediaInline, MediaPermanentInline, PhoneNumberInline
from .admin import site as admin_site
from .models import Category, Contact, Episode, EpisodePermanent, Media, PhoneNumber


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


@override_settings(ROOT_URLCONF="generic_inline_admin.urls")
class GenericAdminViewTest(TestDataMixin, TestCase):
    def setUp(self):
        self.client.force_login(self.superuser)

        e = Episode.objects.create(name="This Week in Django")
        self.episode_pk = e.pk
        m = Media(content_object=e, url="http://example.com/podcast.mp3")
        m.save()
        self.mp3_media_pk = m.pk

        m = Media(content_object=e, url="http://example.com/logo.png")
        m.save()
        self.png_media_pk = m.pk

    def test_basic_add_GET(self):
        """
        A smoke test to ensure GET on the add_view works.
        """
        response = self.client.get(reverse("admin:generic_inline_admin_episode_add"))
        self.assertEqual(response.status_code, 200)

    def test_basic_edit_GET(self):
        """
        A smoke test to ensure GET on the change_view works.
        """
        response = self.client.get(
            reverse(
                "admin:generic_inline_admin_episode_change", args=(self.episode_pk,)
            )
        )
        self.assertEqual(response.status_code, 200)

    def test_basic_add_POST(self):
        """
        A smoke test to ensure POST on add_view works.
        """
        post_data = {
            "name": "This Week in Django",
            # inline data
            "generic_inline_admin-media-content_type-object_id-TOTAL_FORMS": "1",
            "generic_inline_admin-media-content_type-object_id-INITIAL_FORMS": "0",
            "generic_inline_admin-media-content_type-object_id-MAX_NUM_FORMS": "0",
        }
        response = self.client.post(
            reverse("admin:generic_inline_admin_episode_add"), post_data
        )
        self.assertEqual(response.status_code, 302)  # redirect somewhere

    def test_basic_edit_POST(self):
        """
        A smoke test to ensure POST on edit_view works.
        """
        prefix = "generic_inline_admin-media-content_type-object_id"
        post_data = {
            "name": "This Week in Django",
            # inline data
            f"{prefix}-TOTAL_FORMS": "3",
            f"{prefix}-INITIAL_FORMS": "2",
            f"{prefix}-MAX_NUM_FORMS": "0",
            f"{prefix}-0-id": str(self.mp3_media_pk),
            f"{prefix}-0-url": "http://example.com/podcast.mp3",
            f"{prefix}-1-id": str(self.png_media_pk),
            f"{prefix}-1-url": "http://example.com/logo.png",
            f"{prefix}-2-id": "",
            f"{prefix}-2-url": "",
        }
        url = reverse(
            "admin:generic_inline_admin_episode_change", args=(self.episode_pk,)
        )
        response = self.client.post(url, post_data)
        self.assertEqual(response.status_code, 302)  # redirect somewhere


@override_settings(ROOT_URLCONF="generic_inline_admin.urls")
class GenericInlineAdminParametersTest(TestDataMixin, TestCase):
    factory = RequestFactory()

    def setUp(self):
        self.client.force_login(self.superuser)

    def _create_object(self, model):
        """
        Create a model with an attached Media object via GFK. We can't
        load content via a fixture (since the GenericForeignKey relies on
        content type IDs, which will vary depending on what other tests
        have been run), thus we do it here.
        """
        e = model.objects.create(name="This Week in Django")
        Media.objects.create(content_object=e, url="http://example.com/podcast.mp3")
        return e

    def test_no_param(self):
        """
        With one initial form, extra (default) at 3, there should be 4 forms.
        """
        e = self._create_object(Episode)
        response = self.client.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        formset = response.context["inline_admin_formsets"][0].formset
        self.assertEqual(formset.total_form_count(), 4)
        self.assertEqual(formset.initial_form_count(), 1)

    def test_extra_param(self):
        """
        With extra=0, there should be one form.
        """

        class ExtraInline(GenericTabularInline):
            model = Media
            extra = 0

        modeladmin = admin.ModelAdmin(Episode, admin_site)
        modeladmin.inlines = [ExtraInline]

        e = self._create_object(Episode)
        request = self.factory.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        request.user = User(username="super", is_superuser=True)
        response = modeladmin.changeform_view(request, object_id=str(e.pk))
        formset = response.context_data["inline_admin_formsets"][0].formset
        self.assertEqual(formset.total_form_count(), 1)
        self.assertEqual(formset.initial_form_count(), 1)

    def test_max_num_param(self):
        """
        With extra=5 and max_num=2, there should be only 2 forms.
        """

        class MaxNumInline(GenericTabularInline):
            model = Media
            extra = 5
            max_num = 2

        modeladmin = admin.ModelAdmin(Episode, admin_site)
        modeladmin.inlines = [MaxNumInline]

        e = self._create_object(Episode)
        request = self.factory.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        request.user = User(username="super", is_superuser=True)
        response = modeladmin.changeform_view(request, object_id=str(e.pk))
        formset = response.context_data["inline_admin_formsets"][0].formset
        self.assertEqual(formset.total_form_count(), 2)
        self.assertEqual(formset.initial_form_count(), 1)

    def test_min_num_param(self):
        """
        With extra=3 and min_num=2, there should be five forms.
        """

        class MinNumInline(GenericTabularInline):
            model = Media
            extra = 3
            min_num = 2

        modeladmin = admin.ModelAdmin(Episode, admin_site)
        modeladmin.inlines = [MinNumInline]

        e = self._create_object(Episode)
        request = self.factory.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        request.user = User(username="super", is_superuser=True)
        response = modeladmin.changeform_view(request, object_id=str(e.pk))
        formset = response.context_data["inline_admin_formsets"][0].formset
        self.assertEqual(formset.total_form_count(), 5)
        self.assertEqual(formset.initial_form_count(), 1)

    def test_get_extra(self):
        class GetExtraInline(GenericTabularInline):
            model = Media
            extra = 4

            def get_extra(self, request, obj):
                return 2

        modeladmin = admin.ModelAdmin(Episode, admin_site)
        modeladmin.inlines = [GetExtraInline]
        e = self._create_object(Episode)
        request = self.factory.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        request.user = User(username="super", is_superuser=True)
        response = modeladmin.changeform_view(request, object_id=str(e.pk))
        formset = response.context_data["inline_admin_formsets"][0].formset

        self.assertEqual(formset.extra, 2)

    def test_get_min_num(self):
        class GetMinNumInline(GenericTabularInline):
            model = Media
            min_num = 5

            def get_min_num(self, request, obj):
                return 2

        modeladmin = admin.ModelAdmin(Episode, admin_site)
        modeladmin.inlines = [GetMinNumInline]
        e = self._create_object(Episode)
        request = self.factory.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        request.user = User(username="super", is_superuser=True)
        response = modeladmin.changeform_view(request, object_id=str(e.pk))
        formset = response.context_data["inline_admin_formsets"][0].formset

        self.assertEqual(formset.min_num, 2)

    def test_get_max_num(self):
        class GetMaxNumInline(GenericTabularInline):
            model = Media
            extra = 5

            def get_max_num(self, request, obj):
                return 2

        modeladmin = admin.ModelAdmin(Episode, admin_site)
        modeladmin.inlines = [GetMaxNumInline]
        e = self._create_object(Episode)
        request = self.factory.get(
            reverse("admin:generic_inline_admin_episode_change", args=(e.pk,))
        )
        request.user = User(username="super", is_superuser=True)
        response = modeladmin.changeform_view(request, object_id=str(e.pk))
        formset = response.context_data["inline_admin_formsets"][0].formset

        self.assertEqual(formset.max_num, 2)


@override_settings(ROOT_URLCONF="generic_inline_admin.urls")
class GenericInlineAdminWithUniqueTogetherTest(TestDataMixin, TestCase):
    def setUp(self):
        self.client.force_login(self.superuser)

    def test_add(self):
        category_id = Category.objects.create(name="male").pk
        prefix = "generic_inline_admin-phonenumber-content_type-object_id"
        post_data = {
            "name": "John Doe",
            # inline data
            f"{prefix}-TOTAL_FORMS": "1",
            f"{prefix}-INITIAL_FORMS": "0",
            f"{prefix}-MAX_NUM_FORMS": "0",
            f"{prefix}-0-id": "",
            f"{prefix}-0-phone_number": "555-555-5555",
            f"{prefix}-0-category": str(category_id),
        }
        response = self.client.get(reverse("admin:generic_inline_admin_contact_add"))
        self.assertEqual(response.status_code, 200)
        response = self.client.post(
            reverse("admin:generic_inline_admin_contact_add"), post_data
        )
        self.assertEqual(response.status_code, 302)  # redirect somewhere

    def test_delete(self):
        from .models import Contact

        c = Contact.objects.create(name="foo")
        PhoneNumber.objects.create(
            object_id=c.id,
            content_type=ContentType.objects.get_for_model(Contact),
            phone_number="555-555-5555",
        )
        response = self.client.post(
            reverse("admin:generic_inline_admin_contact_delete", args=[c.pk])
        )
        self.assertContains(response, "Are you sure you want to delete")


@override_settings(ROOT_URLCONF="generic_inline_admin.urls")
class GenericInlineAdminPermissionsTest(TestCase):
    factory = RequestFactory()

    @classmethod
    def setUpTestData(cls):
        cls.user = User(username="admin", is_staff=True, is_active=True)
        cls.user.set_password("secret")
        cls.user.save()

        # User always has all permissions on Contact (parent) model.
        # Permissions on the inlines vary per test.
        cls.contact_type = ContentType.objects.get_for_model(Contact)
        cls.user.user_permissions.add(
            *Permission.objects.filter(content_type=cls.contact_type)
        )

    def test_add_inline_without_add_permission(self):
        self.client.force_login(self.user)
        inline_view_perm = Permission.objects.get(codename="view_phonenumber")
        self.user.user_permissions.add(inline_view_perm)

        category_id = Category.objects.create(name="test").pk
        prefix = "generic_inline_admin-phonenumber-content_type-object_id"
        post_data = {
            "name": "Barbara",
            # inline data
            f"{prefix}-TOTAL_FORMS": "1",
            f"{prefix}-INITIAL_FORMS": "0",
            f"{prefix}-MIN_NUM_FORMS": "0",
            f"{prefix}-MAX_NUM_FORMS": "0",
            f"{prefix}-0-id": "",
            f"{prefix}-0-phone_number": "555-555-5555",
            f"{prefix}-0-category": str(category_id),
        }
        request = self.factory.get(reverse("admin:generic_inline_admin_contact_add"))
        request.user = self.user
        inline = PhoneNumberInline(Contact, AdminSite())
        FormSet = inline.get_formset(request)
        formset = FormSet(
            data=post_data, prefix=prefix, instance=Contact(name="Barbara")
        )

        self.assertIs(formset.is_valid(), True)
        self.assertIs(formset.has_changed(), False)
        self.assertEqual(formset.save(commit=False), [])

    def test_add_inline_with_change_permission_only(self):
        """
        Forged new inline instances are ignored without add permissions, but
        but edits still work with edit permissions.
        """
        self.client.force_login(self.user)
        inline_perms = Permission.objects.filter(
            codename__in=("view_phonenumber", "change_phonenumber")
        )
        self.user.user_permissions.add(*inline_perms)

        category_id = Category.objects.create(name="test").pk
        contact = Contact.objects.create(name="Barbara")
        existing_number = PhoneNumber.objects.create(
            category_id=category_id,
            content_type=self.contact_type,
            object_id=contact.pk,
            phone_number="555-555-5555",
        )
        prefix = "generic_inline_admin-phonenumber-content_type-object_id"
        post_data = {
            "id": str(contact.pk),
            "name": "Barbara",
            # inline data
            f"{prefix}-TOTAL_FORMS": "2",
            f"{prefix}-INITIAL_FORMS": "1",
            f"{prefix}-MIN_NUM_FORMS": "0",
            f"{prefix}-MAX_NUM_FORMS": "0",
            # Attempt to edit the existing phone number value.
            f"{prefix}-0-id": str(existing_number.id),
            f"{prefix}-0-phone_number": "111-111-1111",
            f"{prefix}-0-category": str(category_id),
            # Attempt to forge a new phone number.
            f"{prefix}-1-id": "",
            f"{prefix}-1-phone_number": "666-666-6666",
            f"{prefix}-1-category": str(category_id),
            "_save": "Save",
        }
        request = self.factory.get(
            reverse("admin:generic_inline_admin_contact_change", args=[contact.pk])
        )
        request.user = self.user
        inline = PhoneNumberInline(Contact, AdminSite())
        FormSet = inline.get_formset(request)
        formset = FormSet(data=post_data, prefix=prefix, instance=contact)

        self.assertIs(formset.is_valid(), True)
        self.assertIs(formset.has_changed(), True)
        # The edit succeeds; the add is ignored.
        self.assertEqual(formset.save(commit=False), [existing_number])


class MockRequest:
    pass


class MockSuperUser:
    def has_perm(self, perm, obj=None):
        return True


request = MockRequest()
request.user = MockSuperUser()


@override_settings(ROOT_URLCONF="generic_inline_admin.urls")
class NoInlineDeletionTest(SimpleTestCase):
    def test_no_deletion(self):
        inline = MediaPermanentInline(EpisodePermanent, admin_site)
        formset = inline.get_formset(request)
        self.assertFalse(formset.can_delete)


@override_settings(ROOT_URLCONF="generic_inline_admin.urls")
class GenericInlineModelAdminTest(SimpleTestCase):
    def setUp(self):
        self.site = AdminSite()

    def test_get_formset_kwargs(self):
        media_inline = MediaInline(Media, AdminSite())

        # Create a formset with default arguments
        formset = media_inline.get_formset(request)
        self.assertEqual(formset.max_num, DEFAULT_MAX_NUM)
        self.assertIs(formset.can_order, False)

        # Create a formset with custom keyword arguments
        formset = media_inline.get_formset(request, max_num=100, can_order=True)
        self.assertEqual(formset.max_num, 100)
        self.assertIs(formset.can_order, True)

    def test_custom_form_meta_exclude_with_readonly(self):
        """
        The custom ModelForm's `Meta.exclude` is respected when
        used in conjunction with `GenericInlineModelAdmin.readonly_fields`
        and when no `ModelAdmin.exclude` is defined.
        """

        class MediaForm(ModelForm):
            class Meta:
                model = Media
                exclude = ["url"]

        class MediaInline(GenericTabularInline):
            readonly_fields = ["description"]
            form = MediaForm
            model = Media

        class EpisodeAdmin(admin.ModelAdmin):
            inlines = [MediaInline]

        ma = EpisodeAdmin(Episode, self.site)
        self.assertEqual(
            list(list(ma.get_formsets_with_inlines(request))[0][0]().forms[0].fields),
            ["keywords", "id", "DELETE"],
        )

    def test_custom_form_meta_exclude(self):
        """
        The custom ModelForm's `Meta.exclude` is respected by
        `GenericInlineModelAdmin.get_formset`, and overridden if
        `ModelAdmin.exclude` or `GenericInlineModelAdmin.exclude` are defined.
        Refs #15907.
        """
        # First with `GenericInlineModelAdmin`  -----------------

        class MediaForm(ModelForm):
            class Meta:
                model = Media
                exclude = ["url"]

        class MediaInline(GenericTabularInline):
            exclude = ["description"]
            form = MediaForm
            model = Media

        class EpisodeAdmin(admin.ModelAdmin):
            inlines = [MediaInline]

        ma = EpisodeAdmin(Episode, self.site)
        self.assertEqual(
            list(list(ma.get_formsets_with_inlines(request))[0][0]().forms[0].fields),
            ["url", "keywords", "id", "DELETE"],
        )

        # Then, only with `ModelForm`  -----------------

        class MediaInline(GenericTabularInline):
            form = MediaForm
            model = Media

        class EpisodeAdmin(admin.ModelAdmin):
            inlines = [MediaInline]

        ma = EpisodeAdmin(Episode, self.site)
        self.assertEqual(
            list(list(ma.get_formsets_with_inlines(request))[0][0]().forms[0].fields),
            ["description", "keywords", "id", "DELETE"],
        )

    def test_get_fieldsets(self):
        # get_fieldsets is called when figuring out form fields.
        # Refs #18681.
        class MediaForm(ModelForm):
            class Meta:
                model = Media
                fields = "__all__"

        class MediaInline(GenericTabularInline):
            form = MediaForm
            model = Media
            can_delete = False

            def get_fieldsets(self, request, obj=None):
                return [(None, {"fields": ["url", "description"]})]

        ma = MediaInline(Media, self.site)
        form = ma.get_formset(None).form
        self.assertEqual(form._meta.fields, ["url", "description"])

    def test_get_formsets_with_inlines_returns_tuples(self):
        """
        get_formsets_with_inlines() returns the correct tuples.
        """

        class MediaForm(ModelForm):
            class Meta:
                model = Media
                exclude = ["url"]

        class MediaInline(GenericTabularInline):
            form = MediaForm
            model = Media

        class AlternateInline(GenericTabularInline):
            form = MediaForm
            model = Media

        class EpisodeAdmin(admin.ModelAdmin):
            inlines = [AlternateInline, MediaInline]

        ma = EpisodeAdmin(Episode, self.site)
        inlines = ma.get_inline_instances(request)
        for (formset, inline), other_inline in zip(
            ma.get_formsets_with_inlines(request), inlines
        ):
            self.assertIsInstance(formset, other_inline.get_formset(request).__class__)

    def test_get_inline_instances_override_get_inlines(self):
        class MediaInline(GenericTabularInline):
            model = Media

        class AlternateInline(GenericTabularInline):
            model = Media

        class EpisodeAdmin(admin.ModelAdmin):
            inlines = (AlternateInline, MediaInline)

            def get_inlines(self, request, obj):
                if hasattr(request, "name"):
                    if request.name == "alternate":
                        return self.inlines[:1]
                    elif request.name == "media":
                        return self.inlines[1:2]
                return []

        ma = EpisodeAdmin(Episode, self.site)
        self.assertEqual(ma.get_inlines(request, None), [])
        self.assertEqual(ma.get_inline_instances(request), [])
        for name, inline_class in (
            ("alternate", AlternateInline),
            ("media", MediaInline),
        ):
            request.name = name
            self.assertEqual(ma.get_inlines(request, None), (inline_class,))
            self.assertEqual(type(ma.get_inline_instances(request)[0]), inline_class)
