from django.conf import settings
from django.core.checks.messages import Error, Warning
from django.core.checks.urls import (
    E006,
    check_url_config,
    check_url_namespaces_unique,
    check_url_settings,
    get_warning_for_invalid_pattern,
)
from django.test import SimpleTestCase
from django.test.utils import override_settings


class CheckUrlConfigTests(SimpleTestCase):
    @override_settings(ROOT_URLCONF="check_framework.urls.no_warnings")
    def test_no_warnings(self):
        result = check_url_config(None)
        self.assertEqual(result, [])

    @override_settings(ROOT_URLCONF="check_framework.urls.no_warnings_i18n")
    def test_no_warnings_i18n(self):
        self.assertEqual(check_url_config(None), [])

    @override_settings(ROOT_URLCONF="check_framework.urls.warning_in_include")
    def test_check_resolver_recursive(self):
        # The resolver is checked recursively (examining URL patterns in include()).
        result = check_url_config(None)
        self.assertEqual(len(result), 1)
        warning = result[0]
        self.assertEqual(warning.id, "urls.W001")

    @override_settings(ROOT_URLCONF="check_framework.urls.include_with_dollar")
    def test_include_with_dollar(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 1)
        warning = result[0]
        self.assertEqual(warning.id, "urls.W001")
        self.assertEqual(
            warning.msg,
            (
                "Your URL pattern '^include-with-dollar$' uses include with a "
                "route ending with a '$'. Remove the dollar from the route to "
                "avoid problems including URLs."
            ),
        )

    @override_settings(ROOT_URLCONF="check_framework.urls.contains_tuple")
    def test_contains_tuple_not_url_instance(self):
        result = check_url_config(None)
        warning = result[0]
        self.assertEqual(warning.id, "urls.E004")
        self.assertRegex(
            warning.msg,
            (
                r"^Your URL pattern \('\^tuple/\$', <function <lambda> at 0x(\w+)>\) "
                r"is invalid. Ensure that urlpatterns is a list of path\(\) and/or "
                r"re_path\(\) instances\.$"
            ),
        )

    @override_settings(ROOT_URLCONF="check_framework.urls.include_contains_tuple")
    def test_contains_included_tuple(self):
        result = check_url_config(None)
        warning = result[0]
        self.assertEqual(warning.id, "urls.E004")
        self.assertRegex(
            warning.msg,
            (
                r"^Your URL pattern \('\^tuple/\$', <function <lambda> at 0x(\w+)>\) "
                r"is invalid. Ensure that urlpatterns is a list of path\(\) and/or "
                r"re_path\(\) instances\.$"
            ),
        )

    @override_settings(ROOT_URLCONF="check_framework.urls.beginning_with_slash")
    def test_beginning_with_slash(self):
        msg = (
            "Your URL pattern '%s' has a route beginning with a '/'. Remove "
            "this slash as it is unnecessary. If this pattern is targeted in "
            "an include(), ensure the include() pattern has a trailing '/'."
        )
        warning1, warning2 = check_url_config(None)
        self.assertEqual(warning1.id, "urls.W002")
        self.assertEqual(warning1.msg, msg % "/path-starting-with-slash/")
        self.assertEqual(warning2.id, "urls.W002")
        self.assertEqual(warning2.msg, msg % "/url-starting-with-slash/$")

    @override_settings(
        ROOT_URLCONF="check_framework.urls.beginning_with_slash",
        APPEND_SLASH=False,
    )
    def test_beginning_with_slash_append_slash(self):
        # It can be useful to start a URL pattern with a slash when
        # APPEND_SLASH=False (#27238).
        result = check_url_config(None)
        self.assertEqual(result, [])

    @override_settings(ROOT_URLCONF="check_framework.urls.name_with_colon")
    def test_name_with_colon(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 1)
        warning = result[0]
        self.assertEqual(warning.id, "urls.W003")
        expected_msg = (
            "Your URL pattern '^$' [name='name_with:colon'] has a name including a ':'."
        )
        self.assertIn(expected_msg, warning.msg)

    @override_settings(ROOT_URLCONF=None)
    def test_no_root_urlconf_in_settings(self):
        delattr(settings, "ROOT_URLCONF")
        result = check_url_config(None)
        self.assertEqual(result, [])

    def test_get_warning_for_invalid_pattern_string(self):
        warning = get_warning_for_invalid_pattern("")[0]
        self.assertEqual(
            warning.hint,
            "Try removing the string ''. The list of urlpatterns should "
            "not have a prefix string as the first element.",
        )

    def test_get_warning_for_invalid_pattern_tuple(self):
        warning = get_warning_for_invalid_pattern((r"^$", lambda x: x))[0]
        self.assertEqual(warning.hint, "Try using path() instead of a tuple.")

    def test_get_warning_for_invalid_pattern_other(self):
        warning = get_warning_for_invalid_pattern(object())[0]
        self.assertIsNone(warning.hint)

    @override_settings(ROOT_URLCONF="check_framework.urls.non_unique_namespaces")
    def test_check_non_unique_namespaces(self):
        result = check_url_namespaces_unique(None)
        self.assertEqual(len(result), 2)
        non_unique_namespaces = ["app-ns1", "app-1"]
        warning_messages = [
            "URL namespace '{}' isn't unique. You may not be able to reverse "
            "all URLs in this namespace".format(namespace)
            for namespace in non_unique_namespaces
        ]
        for warning in result:
            self.assertIsInstance(warning, Warning)
            self.assertEqual("urls.W005", warning.id)
            self.assertIn(warning.msg, warning_messages)

    @override_settings(ROOT_URLCONF="check_framework.urls.unique_namespaces")
    def test_check_unique_namespaces(self):
        result = check_url_namespaces_unique(None)
        self.assertEqual(result, [])

    @override_settings(ROOT_URLCONF="check_framework.urls.cbv_as_view")
    def test_check_view_not_class(self):
        self.assertEqual(
            check_url_config(None),
            [
                Error(
                    "Your URL pattern 'missing_as_view' has an invalid view, pass "
                    "EmptyCBV.as_view() instead of EmptyCBV.",
                    id="urls.E009",
                ),
            ],
        )


class UpdatedToPathTests(SimpleTestCase):
    @override_settings(
        ROOT_URLCONF="check_framework.urls.path_compatibility.contains_re_named_group"
    )
    def test_contains_re_named_group(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 1)
        warning = result[0]
        self.assertEqual(warning.id, "2_0.W001")
        expected_msg = "Your URL pattern '(?P<named_group>\\d+)' has a route"
        self.assertIn(expected_msg, warning.msg)

    @override_settings(
        ROOT_URLCONF="check_framework.urls.path_compatibility.beginning_with_caret"
    )
    def test_beginning_with_caret(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 1)
        warning = result[0]
        self.assertEqual(warning.id, "2_0.W001")
        expected_msg = "Your URL pattern '^beginning-with-caret' has a route"
        self.assertIn(expected_msg, warning.msg)

    @override_settings(
        ROOT_URLCONF="check_framework.urls.path_compatibility.ending_with_dollar"
    )
    def test_ending_with_dollar(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 1)
        warning = result[0]
        self.assertEqual(warning.id, "2_0.W001")
        expected_msg = "Your URL pattern 'ending-with-dollar$' has a route"
        self.assertIn(expected_msg, warning.msg)


class CheckCustomErrorHandlersTests(SimpleTestCase):
    @override_settings(
        ROOT_URLCONF="check_framework.urls.bad_function_based_error_handlers",
    )
    def test_bad_function_based_handlers(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 4)
        for code, num_params, error in zip([400, 403, 404, 500], [2, 2, 2, 1], result):
            with self.subTest("handler{}".format(code)):
                self.assertEqual(
                    error,
                    Error(
                        "The custom handler{} view 'check_framework.urls."
                        "bad_function_based_error_handlers.bad_handler' "
                        "does not take the correct number of arguments "
                        "(request{}).".format(
                            code, ", exception" if num_params == 2 else ""
                        ),
                        id="urls.E007",
                    ),
                )

    @override_settings(
        ROOT_URLCONF="check_framework.urls.bad_class_based_error_handlers",
    )
    def test_bad_class_based_handlers(self):
        result = check_url_config(None)
        self.assertEqual(len(result), 4)
        for code, num_params, error in zip([400, 403, 404, 500], [2, 2, 2, 1], result):
            with self.subTest("handler%s" % code):
                self.assertEqual(
                    error,
                    Error(
                        "The custom handler%s view 'check_framework.urls."
                        "bad_class_based_error_handlers.HandlerView.as_view."
                        "<locals>.view' does not take the correct number of "
                        "arguments (request%s)."
                        % (
                            code,
                            ", exception" if num_params == 2 else "",
                        ),
                        id="urls.E007",
                    ),
                )

    @override_settings(
        ROOT_URLCONF="check_framework.urls.bad_error_handlers_invalid_path"
    )
    def test_bad_handlers_invalid_path(self):
        result = check_url_config(None)
        paths = [
            "django.views.bad_handler",
            "django.invalid_module.bad_handler",
            "invalid_module.bad_handler",
            "django",
        ]
        hints = [
            "Could not import '{}'. View does not exist in module django.views.",
            "Could not import '{}'. Parent module django.invalid_module does not "
            "exist.",
            "No module named 'invalid_module'",
            "Could not import '{}'. The path must be fully qualified.",
        ]
        for code, path, hint, error in zip([400, 403, 404, 500], paths, hints, result):
            with self.subTest("handler{}".format(code)):
                self.assertEqual(
                    error,
                    Error(
                        "The custom handler{} view '{}' could not be imported.".format(
                            code, path
                        ),
                        hint=hint.format(path),
                        id="urls.E008",
                    ),
                )

    @override_settings(
        ROOT_URLCONF="check_framework.urls.good_function_based_error_handlers",
    )
    def test_good_function_based_handlers(self):
        result = check_url_config(None)
        self.assertEqual(result, [])

    @override_settings(
        ROOT_URLCONF="check_framework.urls.good_class_based_error_handlers",
    )
    def test_good_class_based_handlers(self):
        result = check_url_config(None)
        self.assertEqual(result, [])


class CheckURLSettingsTests(SimpleTestCase):
    @override_settings(STATIC_URL="a/", MEDIA_URL="b/")
    def test_slash_no_errors(self):
        self.assertEqual(check_url_settings(None), [])

    @override_settings(STATIC_URL="", MEDIA_URL="")
    def test_empty_string_no_errors(self):
        self.assertEqual(check_url_settings(None), [])

    @override_settings(STATIC_URL="noslash")
    def test_static_url_no_slash(self):
        self.assertEqual(check_url_settings(None), [E006("STATIC_URL")])

    @override_settings(STATIC_URL="slashes//")
    def test_static_url_double_slash_allowed(self):
        # The check allows for a double slash, presuming the user knows what
        # they are doing.
        self.assertEqual(check_url_settings(None), [])

    @override_settings(MEDIA_URL="noslash")
    def test_media_url_no_slash(self):
        self.assertEqual(check_url_settings(None), [E006("MEDIA_URL")])
