from django import forms
from django.core.exceptions import ImproperlyConfigured
from django.test import SimpleTestCase, TestCase, override_settings
from django.test.client import RequestFactory
from django.urls import reverse
from django.views.generic.base import View
from django.views.generic.edit import (
    CreateView,
    DeleteView,
    DeleteViewCustomDeleteWarning,
    FormMixin,
    ModelFormMixin,
)

from . import views
from .forms import AuthorForm
from .models import Artist, Author


class FormMixinTests(SimpleTestCase):
    request_factory = RequestFactory()

    def test_initial_data(self):
        """Test instance independence of initial data dict (see #16138)"""
        initial_1 = FormMixin().get_initial()
        initial_1["foo"] = "bar"
        initial_2 = FormMixin().get_initial()
        self.assertNotEqual(initial_1, initial_2)

    def test_get_prefix(self):
        """Test prefix can be set (see #18872)"""
        test_string = "test"

        get_request = self.request_factory.get("/")

        class TestFormMixin(FormMixin):
            request = get_request

        default_kwargs = TestFormMixin().get_form_kwargs()
        self.assertIsNone(default_kwargs.get("prefix"))

        set_mixin = TestFormMixin()
        set_mixin.prefix = test_string
        set_kwargs = set_mixin.get_form_kwargs()
        self.assertEqual(test_string, set_kwargs.get("prefix"))

    def test_get_form(self):
        class TestFormMixin(FormMixin):
            request = self.request_factory.get("/")

        self.assertIsInstance(
            TestFormMixin().get_form(forms.Form),
            forms.Form,
            "get_form() should use provided form class.",
        )

        class FormClassTestFormMixin(TestFormMixin):
            form_class = forms.Form

        self.assertIsInstance(
            FormClassTestFormMixin().get_form(),
            forms.Form,
            "get_form() should fallback to get_form_class() if none is provided.",
        )

    def test_get_context_data(self):
        class FormContext(FormMixin):
            request = self.request_factory.get("/")
            form_class = forms.Form

        self.assertIsInstance(FormContext().get_context_data()["form"], forms.Form)


@override_settings(ROOT_URLCONF="generic_views.urls")
class BasicFormTests(TestCase):
    def test_post_data(self):
        res = self.client.post("/contact/", {"name": "Me", "message": "Hello"})
        self.assertRedirects(res, "/list/authors/")

    def test_late_form_validation(self):
        """
        A form can be marked invalid in the form_valid() method (#25548).
        """
        res = self.client.post("/late-validation/", {"name": "Me", "message": "Hello"})
        self.assertFalse(res.context["form"].is_valid())


class ModelFormMixinTests(SimpleTestCase):
    def test_get_form(self):
        form_class = views.AuthorGetQuerySetFormView().get_form_class()
        self.assertEqual(form_class._meta.model, Author)

    def test_get_form_checks_for_object(self):
        mixin = ModelFormMixin()
        mixin.request = RequestFactory().get("/")
        self.assertEqual({"initial": {}, "prefix": None}, mixin.get_form_kwargs())


@override_settings(ROOT_URLCONF="generic_views.urls")
class CreateViewTests(TestCase):
    def test_create(self):
        res = self.client.get("/edit/authors/create/")
        self.assertEqual(res.status_code, 200)
        self.assertIsInstance(res.context["form"], forms.ModelForm)
        self.assertIsInstance(res.context["view"], View)
        self.assertNotIn("object", res.context)
        self.assertNotIn("author", res.context)
        self.assertTemplateUsed(res, "generic_views/author_form.html")

        res = self.client.post(
            "/edit/authors/create/",
            {"name": "Randall Munroe", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True), ["Randall Munroe"]
        )

    def test_create_invalid(self):
        res = self.client.post(
            "/edit/authors/create/", {"name": "A" * 101, "slug": "randall-munroe"}
        )
        self.assertEqual(res.status_code, 200)
        self.assertTemplateUsed(res, "generic_views/author_form.html")
        self.assertEqual(len(res.context["form"].errors), 1)
        self.assertEqual(Author.objects.count(), 0)

    def test_create_with_object_url(self):
        res = self.client.post("/edit/artists/create/", {"name": "Rene Magritte"})
        self.assertEqual(res.status_code, 302)
        artist = Artist.objects.get(name="Rene Magritte")
        self.assertRedirects(res, "/detail/artist/%d/" % artist.pk)
        self.assertQuerySetEqual(Artist.objects.all(), [artist])

    def test_create_with_redirect(self):
        res = self.client.post(
            "/edit/authors/create/redirect/",
            {"name": "Randall Munroe", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/edit/authors/create/")
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True), ["Randall Munroe"]
        )

    def test_create_with_interpolated_redirect(self):
        res = self.client.post(
            "/edit/authors/create/interpolate_redirect/",
            {"name": "Randall Munroe", "slug": "randall-munroe"},
        )
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True), ["Randall Munroe"]
        )
        self.assertEqual(res.status_code, 302)
        pk = Author.objects.first().pk
        self.assertRedirects(res, "/edit/author/%d/update/" % pk)
        # Also test with escaped chars in URL
        res = self.client.post(
            "/edit/authors/create/interpolate_redirect_nonascii/",
            {"name": "John Doe", "slug": "john-doe"},
        )
        self.assertEqual(res.status_code, 302)
        pk = Author.objects.get(name="John Doe").pk
        self.assertRedirects(res, "/%C3%A9dit/author/{}/update/".format(pk))

    def test_create_with_special_properties(self):
        res = self.client.get("/edit/authors/create/special/")
        self.assertEqual(res.status_code, 200)
        self.assertIsInstance(res.context["form"], views.AuthorForm)
        self.assertNotIn("object", res.context)
        self.assertNotIn("author", res.context)
        self.assertTemplateUsed(res, "generic_views/form.html")

        res = self.client.post(
            "/edit/authors/create/special/",
            {"name": "Randall Munroe", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        obj = Author.objects.get(slug="randall-munroe")
        self.assertRedirects(res, reverse("author_detail", kwargs={"pk": obj.pk}))
        self.assertQuerySetEqual(Author.objects.all(), [obj])

    def test_create_without_redirect(self):
        msg = (
            "No URL to redirect to.  Either provide a url or define a "
            "get_absolute_url method on the Model."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            self.client.post(
                "/edit/authors/create/naive/",
                {"name": "Randall Munroe", "slug": "randall-munroe"},
            )

    def test_create_restricted(self):
        res = self.client.post(
            "/edit/authors/create/restricted/",
            {"name": "Randall Munroe", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(
            res, "/accounts/login/?next=/edit/authors/create/restricted/"
        )

    def test_create_view_with_restricted_fields(self):
        class MyCreateView(CreateView):
            model = Author
            fields = ["name"]

        self.assertEqual(list(MyCreateView().get_form_class().base_fields), ["name"])

    def test_create_view_all_fields(self):
        class MyCreateView(CreateView):
            model = Author
            fields = "__all__"

        self.assertEqual(
            list(MyCreateView().get_form_class().base_fields), ["name", "slug"]
        )

    def test_create_view_without_explicit_fields(self):
        class MyCreateView(CreateView):
            model = Author

        message = (
            "Using ModelFormMixin (base class of MyCreateView) without the "
            "'fields' attribute is prohibited."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, message):
            MyCreateView().get_form_class()

    def test_define_both_fields_and_form_class(self):
        class MyCreateView(CreateView):
            model = Author
            form_class = AuthorForm
            fields = ["name"]

        message = "Specifying both 'fields' and 'form_class' is not permitted."
        with self.assertRaisesMessage(ImproperlyConfigured, message):
            MyCreateView().get_form_class()


@override_settings(ROOT_URLCONF="generic_views.urls")
class UpdateViewTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.author = Author.objects.create(
            pk=1,  # Required for OneAuthorUpdate.
            name="Randall Munroe",
            slug="randall-munroe",
        )

    def test_update_post(self):
        res = self.client.get("/edit/author/%d/update/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertIsInstance(res.context["form"], forms.ModelForm)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["author"], self.author)
        self.assertTemplateUsed(res, "generic_views/author_form.html")
        self.assertEqual(res.context["view"].get_form_called_count, 1)

        # Modification with both POST and PUT (browser compatible)
        res = self.client.post(
            "/edit/author/%d/update/" % self.author.pk,
            {"name": "Randall Munroe (xkcd)", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True), ["Randall Munroe (xkcd)"]
        )

    def test_update_invalid(self):
        res = self.client.post(
            "/edit/author/%d/update/" % self.author.pk,
            {"name": "A" * 101, "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 200)
        self.assertTemplateUsed(res, "generic_views/author_form.html")
        self.assertEqual(len(res.context["form"].errors), 1)
        self.assertQuerySetEqual(Author.objects.all(), [self.author])
        self.assertEqual(res.context["view"].get_form_called_count, 1)

    def test_update_with_object_url(self):
        a = Artist.objects.create(name="Rene Magritte")
        res = self.client.post(
            "/edit/artists/%d/update/" % a.pk, {"name": "Rene Magritte"}
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/detail/artist/%d/" % a.pk)
        self.assertQuerySetEqual(Artist.objects.all(), [a])

    def test_update_with_redirect(self):
        res = self.client.post(
            "/edit/author/%d/update/redirect/" % self.author.pk,
            {"name": "Randall Munroe (author of xkcd)", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/edit/authors/create/")
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True),
            ["Randall Munroe (author of xkcd)"],
        )

    def test_update_with_interpolated_redirect(self):
        res = self.client.post(
            "/edit/author/%d/update/interpolate_redirect/" % self.author.pk,
            {"name": "Randall Munroe (author of xkcd)", "slug": "randall-munroe"},
        )
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True),
            ["Randall Munroe (author of xkcd)"],
        )
        self.assertEqual(res.status_code, 302)
        pk = Author.objects.first().pk
        self.assertRedirects(res, "/edit/author/%d/update/" % pk)
        # Also test with escaped chars in URL
        res = self.client.post(
            "/edit/author/%d/update/interpolate_redirect_nonascii/" % self.author.pk,
            {"name": "John Doe", "slug": "john-doe"},
        )
        self.assertEqual(res.status_code, 302)
        pk = Author.objects.get(name="John Doe").pk
        self.assertRedirects(res, "/%C3%A9dit/author/{}/update/".format(pk))

    def test_update_with_special_properties(self):
        res = self.client.get("/edit/author/%d/update/special/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertIsInstance(res.context["form"], views.AuthorForm)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["thingy"], self.author)
        self.assertNotIn("author", res.context)
        self.assertTemplateUsed(res, "generic_views/form.html")

        res = self.client.post(
            "/edit/author/%d/update/special/" % self.author.pk,
            {"name": "Randall Munroe (author of xkcd)", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/detail/author/%d/" % self.author.pk)
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True),
            ["Randall Munroe (author of xkcd)"],
        )

    def test_update_without_redirect(self):
        msg = (
            "No URL to redirect to.  Either provide a url or define a "
            "get_absolute_url method on the Model."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            self.client.post(
                "/edit/author/%d/update/naive/" % self.author.pk,
                {"name": "Randall Munroe (author of xkcd)", "slug": "randall-munroe"},
            )

    def test_update_get_object(self):
        res = self.client.get("/edit/author/update/")
        self.assertEqual(res.status_code, 200)
        self.assertIsInstance(res.context["form"], forms.ModelForm)
        self.assertIsInstance(res.context["view"], View)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["author"], self.author)
        self.assertTemplateUsed(res, "generic_views/author_form.html")

        # Modification with both POST and PUT (browser compatible)
        res = self.client.post(
            "/edit/author/update/",
            {"name": "Randall Munroe (xkcd)", "slug": "randall-munroe"},
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertQuerySetEqual(
            Author.objects.values_list("name", flat=True), ["Randall Munroe (xkcd)"]
        )


@override_settings(ROOT_URLCONF="generic_views.urls")
class DeleteViewTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.author = Author.objects.create(
            name="Randall Munroe",
            slug="randall-munroe",
        )

    def test_delete_by_post(self):
        res = self.client.get("/edit/author/%d/delete/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["author"], self.author)
        self.assertTemplateUsed(res, "generic_views/author_confirm_delete.html")

        # Deletion with POST
        res = self.client.post("/edit/author/%d/delete/" % self.author.pk)
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertQuerySetEqual(Author.objects.all(), [])

    def test_delete_by_delete(self):
        # Deletion with browser compatible DELETE method
        res = self.client.delete("/edit/author/%d/delete/" % self.author.pk)
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertQuerySetEqual(Author.objects.all(), [])

    def test_delete_with_redirect(self):
        res = self.client.post("/edit/author/%d/delete/redirect/" % self.author.pk)
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/edit/authors/create/")
        self.assertQuerySetEqual(Author.objects.all(), [])

    def test_delete_with_interpolated_redirect(self):
        res = self.client.post(
            "/edit/author/%d/delete/interpolate_redirect/" % self.author.pk
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/edit/authors/create/?deleted=%d" % self.author.pk)
        self.assertQuerySetEqual(Author.objects.all(), [])
        # Also test with escaped chars in URL
        a = Author.objects.create(
            **{"name": "Randall Munroe", "slug": "randall-munroe"}
        )
        res = self.client.post(
            "/edit/author/{}/delete/interpolate_redirect_nonascii/".format(a.pk)
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/%C3%A9dit/authors/create/?deleted={}".format(a.pk))

    def test_delete_with_special_properties(self):
        res = self.client.get("/edit/author/%d/delete/special/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["thingy"], self.author)
        self.assertNotIn("author", res.context)
        self.assertTemplateUsed(res, "generic_views/confirm_delete.html")

        res = self.client.post("/edit/author/%d/delete/special/" % self.author.pk)
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertQuerySetEqual(Author.objects.all(), [])

    def test_delete_without_redirect(self):
        msg = "No URL to redirect to. Provide a success_url."
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            self.client.post("/edit/author/%d/delete/naive/" % self.author.pk)

    def test_delete_with_form_as_post(self):
        res = self.client.get("/edit/author/%d/delete/form/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["author"], self.author)
        self.assertTemplateUsed(res, "generic_views/author_confirm_delete.html")
        res = self.client.post(
            "/edit/author/%d/delete/form/" % self.author.pk, data={"confirm": True}
        )
        self.assertEqual(res.status_code, 302)
        self.assertRedirects(res, "/list/authors/")
        self.assertSequenceEqual(Author.objects.all(), [])

    def test_delete_with_form_as_post_with_validation_error(self):
        res = self.client.get("/edit/author/%d/delete/form/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertEqual(res.context["object"], self.author)
        self.assertEqual(res.context["author"], self.author)
        self.assertTemplateUsed(res, "generic_views/author_confirm_delete.html")

        res = self.client.post("/edit/author/%d/delete/form/" % self.author.pk)
        self.assertEqual(res.status_code, 200)
        self.assertEqual(len(res.context_data["form"].errors), 2)
        self.assertEqual(
            res.context_data["form"].errors["__all__"],
            ["You must confirm the delete."],
        )
        self.assertEqual(
            res.context_data["form"].errors["confirm"],
            ["This field is required."],
        )

    # RemovedInDjango50Warning.
    def test_delete_with_custom_delete(self):
        class AuthorDeleteView(DeleteView):
            model = Author

            def delete(self, request, *args, **kwargs):
                # Custom logic.
                pass

        msg = (
            "DeleteView uses FormMixin to handle POST requests. As a "
            "consequence, any custom deletion logic in "
            "AuthorDeleteView.delete() handler should be moved to "
            "form_valid()."
        )
        with self.assertWarnsMessage(DeleteViewCustomDeleteWarning, msg):
            AuthorDeleteView()
