import string
import uuid

from django.core.exceptions import ImproperlyConfigured
from django.test import SimpleTestCase
from django.test.utils import override_settings
from django.urls import NoReverseMatch, Resolver404, path, re_path, resolve, reverse
from django.views import View

from .converters import DynamicConverter
from .views import empty_view

included_kwargs = {"base": b"hello", "value": b"world"}
converter_test_data = (
    # ('url', ('url_name', 'app_name', {kwargs})),
    # aGVsbG8= is 'hello' encoded in base64.
    ("/base64/aGVsbG8=/", ("base64", "", {"value": b"hello"})),
    (
        "/base64/aGVsbG8=/subpatterns/d29ybGQ=/",
        ("subpattern-base64", "", included_kwargs),
    ),
    (
        "/base64/aGVsbG8=/namespaced/d29ybGQ=/",
        ("subpattern-base64", "namespaced-base64", included_kwargs),
    ),
)


@override_settings(ROOT_URLCONF="urlpatterns.path_urls")
class SimplifiedURLTests(SimpleTestCase):
    def test_path_lookup_without_parameters(self):
        match = resolve("/articles/2003/")
        self.assertEqual(match.url_name, "articles-2003")
        self.assertEqual(match.args, ())
        self.assertEqual(match.kwargs, {})
        self.assertEqual(match.route, "articles/2003/")

    def test_path_lookup_with_typed_parameters(self):
        match = resolve("/articles/2015/")
        self.assertEqual(match.url_name, "articles-year")
        self.assertEqual(match.args, ())
        self.assertEqual(match.kwargs, {"year": 2015})
        self.assertEqual(match.route, "articles/<int:year>/")

    def test_path_lookup_with_multiple_parameters(self):
        match = resolve("/articles/2015/04/12/")
        self.assertEqual(match.url_name, "articles-year-month-day")
        self.assertEqual(match.args, ())
        self.assertEqual(match.kwargs, {"year": 2015, "month": 4, "day": 12})
        self.assertEqual(match.route, "articles/<int:year>/<int:month>/<int:day>/")

    def test_two_variable_at_start_of_path_pattern(self):
        match = resolve("/en/foo/")
        self.assertEqual(match.url_name, "lang-and-path")
        self.assertEqual(match.kwargs, {"lang": "en", "url": "foo"})
        self.assertEqual(match.route, "<lang>/<path:url>/")

    def test_re_path(self):
        match = resolve("/regex/1/")
        self.assertEqual(match.url_name, "regex")
        self.assertEqual(match.kwargs, {"pk": "1"})
        self.assertEqual(match.route, "^regex/(?P<pk>[0-9]+)/$")

    def test_re_path_with_optional_parameter(self):
        for url, kwargs in (
            ("/regex_optional/1/2/", {"arg1": "1", "arg2": "2"}),
            ("/regex_optional/1/", {"arg1": "1"}),
        ):
            with self.subTest(url=url):
                match = resolve(url)
                self.assertEqual(match.url_name, "regex_optional")
                self.assertEqual(match.kwargs, kwargs)
                self.assertEqual(
                    match.route,
                    r"^regex_optional/(?P<arg1>\d+)/(?:(?P<arg2>\d+)/)?",
                )

    def test_re_path_with_missing_optional_parameter(self):
        match = resolve("/regex_only_optional/")
        self.assertEqual(match.url_name, "regex_only_optional")
        self.assertEqual(match.kwargs, {})
        self.assertEqual(match.args, ())
        self.assertEqual(
            match.route,
            r"^regex_only_optional/(?:(?P<arg1>\d+)/)?",
        )

    def test_path_lookup_with_inclusion(self):
        match = resolve("/included_urls/extra/something/")
        self.assertEqual(match.url_name, "inner-extra")
        self.assertEqual(match.route, "included_urls/extra/<extra>/")

    def test_path_lookup_with_empty_string_inclusion(self):
        match = resolve("/more/99/")
        self.assertEqual(match.url_name, "inner-more")
        self.assertEqual(match.route, r"^more/(?P<extra>\w+)/$")

    def test_path_lookup_with_double_inclusion(self):
        match = resolve("/included_urls/more/some_value/")
        self.assertEqual(match.url_name, "inner-more")
        self.assertEqual(match.route, r"included_urls/more/(?P<extra>\w+)/$")

    def test_path_reverse_without_parameter(self):
        url = reverse("articles-2003")
        self.assertEqual(url, "/articles/2003/")

    def test_path_reverse_with_parameter(self):
        url = reverse(
            "articles-year-month-day", kwargs={"year": 2015, "month": 4, "day": 12}
        )
        self.assertEqual(url, "/articles/2015/4/12/")

    @override_settings(ROOT_URLCONF="urlpatterns.path_base64_urls")
    def test_converter_resolve(self):
        for url, (url_name, app_name, kwargs) in converter_test_data:
            with self.subTest(url=url):
                match = resolve(url)
                self.assertEqual(match.url_name, url_name)
                self.assertEqual(match.app_name, app_name)
                self.assertEqual(match.kwargs, kwargs)

    @override_settings(ROOT_URLCONF="urlpatterns.path_base64_urls")
    def test_converter_reverse(self):
        for expected, (url_name, app_name, kwargs) in converter_test_data:
            if app_name:
                url_name = "%s:%s" % (app_name, url_name)
            with self.subTest(url=url_name):
                url = reverse(url_name, kwargs=kwargs)
                self.assertEqual(url, expected)

    @override_settings(ROOT_URLCONF="urlpatterns.path_base64_urls")
    def test_converter_reverse_with_second_layer_instance_namespace(self):
        kwargs = included_kwargs.copy()
        kwargs["last_value"] = b"world"
        url = reverse("instance-ns-base64:subsubpattern-base64", kwargs=kwargs)
        self.assertEqual(url, "/base64/aGVsbG8=/subpatterns/d29ybGQ=/d29ybGQ=/")

    def test_path_inclusion_is_matchable(self):
        match = resolve("/included_urls/extra/something/")
        self.assertEqual(match.url_name, "inner-extra")
        self.assertEqual(match.kwargs, {"extra": "something"})

    def test_path_inclusion_is_reversible(self):
        url = reverse("inner-extra", kwargs={"extra": "something"})
        self.assertEqual(url, "/included_urls/extra/something/")

    def test_invalid_kwargs(self):
        msg = "kwargs argument must be a dict, but got str."
        with self.assertRaisesMessage(TypeError, msg):
            path("hello/", empty_view, "name")
        with self.assertRaisesMessage(TypeError, msg):
            re_path("^hello/$", empty_view, "name")

    def test_invalid_converter(self):
        msg = "URL route 'foo/<nonexistent:var>/' uses invalid converter 'nonexistent'."
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            path("foo/<nonexistent:var>/", empty_view)

    def test_invalid_view(self):
        msg = "view must be a callable or a list/tuple in the case of include()."
        with self.assertRaisesMessage(TypeError, msg):
            path("articles/", "invalid_view")

    def test_invalid_view_instance(self):
        class EmptyCBV(View):
            pass

        msg = "view must be a callable, pass EmptyCBV.as_view(), not EmptyCBV()."
        with self.assertRaisesMessage(TypeError, msg):
            path("foo", EmptyCBV())

    def test_whitespace_in_route(self):
        msg = (
            "URL route 'space/<int:num>/extra/<str:%stest>' cannot contain "
            "whitespace in angle brackets <…>"
        )
        for whitespace in string.whitespace:
            with self.subTest(repr(whitespace)):
                with self.assertRaisesMessage(ImproperlyConfigured, msg % whitespace):
                    path("space/<int:num>/extra/<str:%stest>" % whitespace, empty_view)
        # Whitespaces are valid in paths.
        p = path("space%s/<int:num>/" % string.whitespace, empty_view)
        match = p.resolve("space%s/1/" % string.whitespace)
        self.assertEqual(match.kwargs, {"num": 1})

    def test_path_trailing_newlines(self):
        tests = [
            "/articles/2003/\n",
            "/articles/2010/\n",
            "/en/foo/\n",
            "/included_urls/extra/\n",
            "/regex/1/\n",
            "/users/1/\n",
        ]
        for url in tests:
            with self.subTest(url=url), self.assertRaises(Resolver404):
                resolve(url)


@override_settings(ROOT_URLCONF="urlpatterns.converter_urls")
class ConverterTests(SimpleTestCase):
    def test_matching_urls(self):
        def no_converter(x):
            return x

        test_data = (
            ("int", {"0", "1", "01", 1234567890}, int),
            ("str", {"abcxyz"}, no_converter),
            ("path", {"allows.ANY*characters"}, no_converter),
            ("slug", {"abcxyz-ABCXYZ_01234567890"}, no_converter),
            ("uuid", {"39da9369-838e-4750-91a5-f7805cd82839"}, uuid.UUID),
        )
        for url_name, url_suffixes, converter in test_data:
            for url_suffix in url_suffixes:
                url = "/%s/%s/" % (url_name, url_suffix)
                with self.subTest(url=url):
                    match = resolve(url)
                    self.assertEqual(match.url_name, url_name)
                    self.assertEqual(match.kwargs, {url_name: converter(url_suffix)})
                    # reverse() works with string parameters.
                    string_kwargs = {url_name: url_suffix}
                    self.assertEqual(reverse(url_name, kwargs=string_kwargs), url)
                    # reverse() also works with native types (int, UUID, etc.).
                    if converter is not no_converter:
                        # The converted value might be different for int (a
                        # leading zero is lost in the conversion).
                        converted_value = match.kwargs[url_name]
                        converted_url = "/%s/%s/" % (url_name, converted_value)
                        self.assertEqual(
                            reverse(url_name, kwargs={url_name: converted_value}),
                            converted_url,
                        )

    def test_nonmatching_urls(self):
        test_data = (
            ("int", {"-1", "letters"}),
            ("str", {"", "/"}),
            ("path", {""}),
            ("slug", {"", "stars*notallowed"}),
            (
                "uuid",
                {
                    "",
                    "9da9369-838e-4750-91a5-f7805cd82839",
                    "39da9369-838-4750-91a5-f7805cd82839",
                    "39da9369-838e-475-91a5-f7805cd82839",
                    "39da9369-838e-4750-91a-f7805cd82839",
                    "39da9369-838e-4750-91a5-f7805cd8283",
                },
            ),
        )
        for url_name, url_suffixes in test_data:
            for url_suffix in url_suffixes:
                url = "/%s/%s/" % (url_name, url_suffix)
                with self.subTest(url=url), self.assertRaises(Resolver404):
                    resolve(url)


@override_settings(ROOT_URLCONF="urlpatterns.path_same_name_urls")
class SameNameTests(SimpleTestCase):
    def test_matching_urls_same_name(self):
        @DynamicConverter.register_to_url
        def requires_tiny_int(value):
            if value > 5:
                raise ValueError
            return value

        tests = [
            (
                "number_of_args",
                [
                    ([], {}, "0/"),
                    ([1], {}, "1/1/"),
                ],
            ),
            (
                "kwargs_names",
                [
                    ([], {"a": 1}, "a/1/"),
                    ([], {"b": 1}, "b/1/"),
                ],
            ),
            (
                "converter",
                [
                    (["a/b"], {}, "path/a/b/"),
                    (["a b"], {}, "str/a%20b/"),
                    (["a-b"], {}, "slug/a-b/"),
                    (["2"], {}, "int/2/"),
                    (
                        ["39da9369-838e-4750-91a5-f7805cd82839"],
                        {},
                        "uuid/39da9369-838e-4750-91a5-f7805cd82839/",
                    ),
                ],
            ),
            (
                "regex",
                [
                    (["ABC"], {}, "uppercase/ABC/"),
                    (["abc"], {}, "lowercase/abc/"),
                ],
            ),
            (
                "converter_to_url",
                [
                    ([6], {}, "int/6/"),
                    ([1], {}, "tiny_int/1/"),
                ],
            ),
        ]
        for url_name, cases in tests:
            for args, kwargs, url_suffix in cases:
                expected_url = "/%s/%s" % (url_name, url_suffix)
                with self.subTest(url=expected_url):
                    self.assertEqual(
                        reverse(url_name, args=args, kwargs=kwargs),
                        expected_url,
                    )


class ParameterRestrictionTests(SimpleTestCase):
    def test_integer_parameter_name_causes_exception(self):
        msg = (
            "URL route 'hello/<int:1>/' uses parameter name '1' which isn't "
            "a valid Python identifier."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            path(r"hello/<int:1>/", lambda r: None)

    def test_non_identifier_parameter_name_causes_exception(self):
        msg = (
            "URL route 'b/<int:book.id>/' uses parameter name 'book.id' which "
            "isn't a valid Python identifier."
        )
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            path(r"b/<int:book.id>/", lambda r: None)

    def test_allows_non_ascii_but_valid_identifiers(self):
        # \u0394 is "GREEK CAPITAL LETTER DELTA", a valid identifier.
        p = path("hello/<str:\u0394>/", lambda r: None)
        match = p.resolve("hello/1/")
        self.assertEqual(match.kwargs, {"\u0394": "1"})


@override_settings(ROOT_URLCONF="urlpatterns.path_dynamic_urls")
class ConversionExceptionTests(SimpleTestCase):
    """How are errors in Converter.to_python() and to_url() handled?"""

    def test_resolve_value_error_means_no_match(self):
        @DynamicConverter.register_to_python
        def raises_value_error(value):
            raise ValueError()

        with self.assertRaises(Resolver404):
            resolve("/dynamic/abc/")

    def test_resolve_type_error_propagates(self):
        @DynamicConverter.register_to_python
        def raises_type_error(value):
            raise TypeError("This type error propagates.")

        with self.assertRaisesMessage(TypeError, "This type error propagates."):
            resolve("/dynamic/abc/")

    def test_reverse_value_error_means_no_match(self):
        @DynamicConverter.register_to_url
        def raises_value_error(value):
            raise ValueError

        with self.assertRaises(NoReverseMatch):
            reverse("dynamic", kwargs={"value": object()})

    def test_reverse_type_error_propagates(self):
        @DynamicConverter.register_to_url
        def raises_type_error(value):
            raise TypeError("This type error propagates.")

        with self.assertRaisesMessage(TypeError, "This type error propagates."):
            reverse("dynamic", kwargs={"value": object()})