import os
import unittest
import warnings

from django.conf import settings, global_settings
from django.core.exceptions import ImproperlyConfigured
from django.http import HttpRequest
from django.test import SimpleTestCase, TransactionTestCase, TestCase, signals
from django.test.utils import override_settings
from django.utils import six


@override_settings(TEST='override', TEST_OUTER='outer')
class FullyDecoratedTranTestCase(TransactionTestCase):

    available_apps = []

    def test_override(self):
        self.assertEqual(settings.TEST, 'override')
        self.assertEqual(settings.TEST_OUTER, 'outer')

    @override_settings(TEST='override2')
    def test_method_override(self):
        self.assertEqual(settings.TEST, 'override2')
        self.assertEqual(settings.TEST_OUTER, 'outer')

    def test_decorated_testcase_name(self):
        self.assertEqual(FullyDecoratedTranTestCase.__name__, 'FullyDecoratedTranTestCase')

    def test_decorated_testcase_module(self):
        self.assertEqual(FullyDecoratedTranTestCase.__module__, __name__)


@override_settings(TEST='override')
class FullyDecoratedTestCase(TestCase):

    def test_override(self):
        self.assertEqual(settings.TEST, 'override')

    @override_settings(TEST='override2')
    def test_method_override(self):
        self.assertEqual(settings.TEST, 'override2')


class ClassDecoratedTestCaseSuper(TestCase):
    """
    Dummy class for testing max recursion error in child class call to
    super().  Refs #17011.

    """
    def test_max_recursion_error(self):
        pass


@override_settings(TEST='override')
class ClassDecoratedTestCase(ClassDecoratedTestCaseSuper):
    def test_override(self):
        self.assertEqual(settings.TEST, 'override')

    @override_settings(TEST='override2')
    def test_method_override(self):
        self.assertEqual(settings.TEST, 'override2')

    def test_max_recursion_error(self):
        """
        Overriding a method on a super class and then calling that method on
        the super class should not trigger infinite recursion. See #17011.

        """
        try:
            super(ClassDecoratedTestCase, self).test_max_recursion_error()
        except RuntimeError:
            self.fail()


class SettingsTests(TestCase):
    def setUp(self):
        self.testvalue = None
        signals.setting_changed.connect(self.signal_callback)

    def tearDown(self):
        signals.setting_changed.disconnect(self.signal_callback)

    def signal_callback(self, sender, setting, value, **kwargs):
        if setting == 'TEST':
            self.testvalue = value

    def test_override(self):
        settings.TEST = 'test'
        self.assertEqual('test', settings.TEST)
        with self.settings(TEST='override'):
            self.assertEqual('override', settings.TEST)
        self.assertEqual('test', settings.TEST)
        del settings.TEST

    def test_override_change(self):
        settings.TEST = 'test'
        self.assertEqual('test', settings.TEST)
        with self.settings(TEST='override'):
            self.assertEqual('override', settings.TEST)
            settings.TEST = 'test2'
        self.assertEqual('test', settings.TEST)
        del settings.TEST

    def test_override_doesnt_leak(self):
        self.assertRaises(AttributeError, getattr, settings, 'TEST')
        with self.settings(TEST='override'):
            self.assertEqual('override', settings.TEST)
            settings.TEST = 'test'
        self.assertRaises(AttributeError, getattr, settings, 'TEST')

    @override_settings(TEST='override')
    def test_decorator(self):
        self.assertEqual('override', settings.TEST)

    def test_context_manager(self):
        self.assertRaises(AttributeError, getattr, settings, 'TEST')
        override = override_settings(TEST='override')
        self.assertRaises(AttributeError, getattr, settings, 'TEST')
        override.enable()
        self.assertEqual('override', settings.TEST)
        override.disable()
        self.assertRaises(AttributeError, getattr, settings, 'TEST')

    def test_class_decorator(self):
        # SimpleTestCase can be decorated by override_settings, but not ut.TestCase
        class SimpleTestCaseSubclass(SimpleTestCase):
            pass

        class UnittestTestCaseSubclass(unittest.TestCase):
            pass

        decorated = override_settings(TEST='override')(SimpleTestCaseSubclass)
        self.assertIsInstance(decorated, type)
        self.assertTrue(issubclass(decorated, SimpleTestCase))

        with six.assertRaisesRegex(self, Exception,
                "Only subclasses of Django SimpleTestCase*"):
            decorated = override_settings(TEST='override')(UnittestTestCaseSubclass)

    def test_signal_callback_context_manager(self):
        self.assertRaises(AttributeError, getattr, settings, 'TEST')
        with self.settings(TEST='override'):
            self.assertEqual(self.testvalue, 'override')
        self.assertEqual(self.testvalue, None)

    @override_settings(TEST='override')
    def test_signal_callback_decorator(self):
        self.assertEqual(self.testvalue, 'override')

    #
    # Regression tests for #10130: deleting settings.
    #

    def test_settings_delete(self):
        settings.TEST = 'test'
        self.assertEqual('test', settings.TEST)
        del settings.TEST
        self.assertRaises(AttributeError, getattr, settings, 'TEST')

    def test_settings_delete_wrapped(self):
        self.assertRaises(TypeError, delattr, settings, '_wrapped')

    def test_override_settings_delete(self):
        """
        Allow deletion of a setting in an overridden settings set (#18824)
        """
        previous_i18n = settings.USE_I18N
        with self.settings(USE_I18N=False):
            del settings.USE_I18N
            self.assertRaises(AttributeError, getattr, settings, 'USE_I18N')
        self.assertEqual(settings.USE_I18N, previous_i18n)

    def test_override_settings_nested(self):
        """
        Test that override_settings uses the actual _wrapped attribute at
        runtime, not when it was instantiated.
        """

        self.assertRaises(AttributeError, getattr, settings, 'TEST')
        self.assertRaises(AttributeError, getattr, settings, 'TEST2')

        inner = override_settings(TEST2='override')
        with override_settings(TEST='override'):
            self.assertEqual('override', settings.TEST)
            with inner:
                self.assertEqual('override', settings.TEST)
                self.assertEqual('override', settings.TEST2)
            # inner's __exit__ should have restored the settings of the outer
            # context manager, not those when the class was instantiated
            self.assertEqual('override', settings.TEST)
            self.assertRaises(AttributeError, getattr, settings, 'TEST2')

        self.assertRaises(AttributeError, getattr, settings, 'TEST')
        self.assertRaises(AttributeError, getattr, settings, 'TEST2')

    def test_allowed_include_roots_string(self):
        """
        ALLOWED_INCLUDE_ROOTS is not allowed to be incorrectly set to a string
        rather than a tuple.
        """
        self.assertRaises(ValueError, setattr, settings,
            'ALLOWED_INCLUDE_ROOTS', '/var/www/ssi/')


class TestComplexSettingOverride(TestCase):
    def setUp(self):
        self.old_warn_override_settings = signals.COMPLEX_OVERRIDE_SETTINGS.copy()
        signals.COMPLEX_OVERRIDE_SETTINGS.add('TEST_WARN')

    def tearDown(self):
        signals.COMPLEX_OVERRIDE_SETTINGS = self.old_warn_override_settings
        self.assertFalse('TEST_WARN' in signals.COMPLEX_OVERRIDE_SETTINGS)

    def test_complex_override_warning(self):
        """Regression test for #19031"""
        with warnings.catch_warnings(record=True) as w:
            warnings.simplefilter("always")

            override = override_settings(TEST_WARN='override')
            override.enable()
            self.assertEqual('override', settings.TEST_WARN)
            override.disable()

            self.assertEqual(len(w), 1)
            self.assertEqual('Overriding setting TEST_WARN can lead to unexpected behaviour.', str(w[-1].message))


class UniqueSettingsTests(TestCase):
    """
    Tests for the INSTALLED_APPS setting.
    """
    settings_module = settings

    def setUp(self):
        self._installed_apps = self.settings_module.INSTALLED_APPS

    def tearDown(self):
        self.settings_module.INSTALLED_APPS = self._installed_apps

    def test_unique(self):
        """
        An ImproperlyConfigured exception is raised if the INSTALLED_APPS contains
        any duplicate strings.
        """
        with self.assertRaises(ImproperlyConfigured):
            self.settings_module.INSTALLED_APPS = ("myApp1", "myApp1", "myApp2", "myApp3")


class TrailingSlashURLTests(TestCase):
    """
    Tests for the MEDIA_URL and STATIC_URL settings.

    They must end with a slash to ensure there's a deterministic way to build
    paths in templates.
    """
    settings_module = settings

    def setUp(self):
        self._original_media_url = self.settings_module.MEDIA_URL
        self._original_static_url = self.settings_module.STATIC_URL

    def tearDown(self):
        self.settings_module.MEDIA_URL = self._original_media_url
        self.settings_module.STATIC_URL = self._original_static_url

    def test_blank(self):
        """
        The empty string is accepted, even though it doesn't end in a slash.
        """
        self.settings_module.MEDIA_URL = ''
        self.assertEqual('', self.settings_module.MEDIA_URL)

        self.settings_module.STATIC_URL = ''
        self.assertEqual('', self.settings_module.STATIC_URL)

    def test_end_slash(self):
        """
        It works if the value ends in a slash.
        """
        self.settings_module.MEDIA_URL = '/foo/'
        self.assertEqual('/foo/', self.settings_module.MEDIA_URL)

        self.settings_module.MEDIA_URL = 'http://media.foo.com/'
        self.assertEqual('http://media.foo.com/',
                         self.settings_module.MEDIA_URL)

        self.settings_module.STATIC_URL = '/foo/'
        self.assertEqual('/foo/', self.settings_module.STATIC_URL)

        self.settings_module.STATIC_URL = 'http://static.foo.com/'
        self.assertEqual('http://static.foo.com/',
                         self.settings_module.STATIC_URL)

    def test_no_end_slash(self):
        """
        An ImproperlyConfigured exception is raised if the value doesn't end
        in a slash.
        """
        with self.assertRaises(ImproperlyConfigured):
            self.settings_module.MEDIA_URL = '/foo'

        with self.assertRaises(ImproperlyConfigured):
            self.settings_module.MEDIA_URL = 'http://media.foo.com'

        with self.assertRaises(ImproperlyConfigured):
            self.settings_module.STATIC_URL = '/foo'

        with self.assertRaises(ImproperlyConfigured):
            self.settings_module.STATIC_URL = 'http://static.foo.com'

    def test_double_slash(self):
        """
        If the value ends in more than one slash, presume they know what
        they're doing.
        """
        self.settings_module.MEDIA_URL = '/stupid//'
        self.assertEqual('/stupid//', self.settings_module.MEDIA_URL)

        self.settings_module.MEDIA_URL = 'http://media.foo.com/stupid//'
        self.assertEqual('http://media.foo.com/stupid//',
                         self.settings_module.MEDIA_URL)

        self.settings_module.STATIC_URL = '/stupid//'
        self.assertEqual('/stupid//', self.settings_module.STATIC_URL)

        self.settings_module.STATIC_URL = 'http://static.foo.com/stupid//'
        self.assertEqual('http://static.foo.com/stupid//',
                         self.settings_module.STATIC_URL)


class SecureProxySslHeaderTest(TestCase):
    settings_module = settings

    def setUp(self):
        self._original_setting = self.settings_module.SECURE_PROXY_SSL_HEADER

    def tearDown(self):
        self.settings_module.SECURE_PROXY_SSL_HEADER = self._original_setting

    def test_none(self):
        self.settings_module.SECURE_PROXY_SSL_HEADER = None
        req = HttpRequest()
        self.assertEqual(req.is_secure(), False)

    def test_set_without_xheader(self):
        self.settings_module.SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTOCOL', 'https')
        req = HttpRequest()
        self.assertEqual(req.is_secure(), False)

    def test_set_with_xheader_wrong(self):
        self.settings_module.SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTOCOL', 'https')
        req = HttpRequest()
        req.META['HTTP_X_FORWARDED_PROTOCOL'] = 'wrongvalue'
        self.assertEqual(req.is_secure(), False)

    def test_set_with_xheader_right(self):
        self.settings_module.SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTOCOL', 'https')
        req = HttpRequest()
        req.META['HTTP_X_FORWARDED_PROTOCOL'] = 'https'
        self.assertEqual(req.is_secure(), True)
