from __future__ import unicode_literals

import time
import unittest
import warnings

from django.core.exceptions import ImproperlyConfigured
from django.core.urlresolvers import resolve
from django.http import HttpResponse
from django.utils import six
from django.utils.deprecation import RemovedInDjango19Warning
from django.test import TestCase, RequestFactory, ignore_warnings, override_settings
from django.views.generic import View, TemplateView, RedirectView

from . import views


class SimpleView(View):
    """
    A simple view with a docstring.
    """
    def get(self, request):
        return HttpResponse('This is a simple view')


class SimplePostView(SimpleView):
    post = SimpleView.get


class PostOnlyView(View):
    def post(self, request):
        return HttpResponse('This view only accepts POST')


class CustomizableView(SimpleView):
    parameter = {}


def decorator(view):
    view.is_decorated = True
    return view


class DecoratedDispatchView(SimpleView):

    @decorator
    def dispatch(self, request, *args, **kwargs):
        return super(DecoratedDispatchView, self).dispatch(request, *args, **kwargs)


class AboutTemplateView(TemplateView):
    def get(self, request):
        return self.render_to_response({})

    def get_template_names(self):
        return ['generic_views/about.html']


class AboutTemplateAttributeView(TemplateView):
    template_name = 'generic_views/about.html'

    def get(self, request):
        return self.render_to_response(context={})


class InstanceView(View):

    def get(self, request):
        return self


class ViewTest(unittest.TestCase):
    rf = RequestFactory()

    def _assert_simple(self, response):
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.content, b'This is a simple view')

    def test_no_init_kwargs(self):
        """
        Test that a view can't be accidentally instantiated before deployment
        """
        try:
            SimpleView(key='value').as_view()
            self.fail('Should not be able to instantiate a view')
        except AttributeError:
            pass

    def test_no_init_args(self):
        """
        Test that a view can't be accidentally instantiated before deployment
        """
        try:
            SimpleView.as_view('value')
            self.fail('Should not be able to use non-keyword arguments instantiating a view')
        except TypeError:
            pass

    def test_pathological_http_method(self):
        """
        The edge case of a http request that spoofs an existing method name is caught.
        """
        self.assertEqual(SimpleView.as_view()(
            self.rf.get('/', REQUEST_METHOD='DISPATCH')
        ).status_code, 405)

    def test_get_only(self):
        """
        Test a view which only allows GET doesn't allow other methods.
        """
        self._assert_simple(SimpleView.as_view()(self.rf.get('/')))
        self.assertEqual(SimpleView.as_view()(self.rf.post('/')).status_code, 405)
        self.assertEqual(SimpleView.as_view()(
            self.rf.get('/', REQUEST_METHOD='FAKE')
        ).status_code, 405)

    def test_get_and_head(self):
        """
        Test a view which supplies a GET method also responds correctly to HEAD.
        """
        self._assert_simple(SimpleView.as_view()(self.rf.get('/')))
        response = SimpleView.as_view()(self.rf.head('/'))
        self.assertEqual(response.status_code, 200)

    def test_head_no_get(self):
        """
        Test a view which supplies no GET method responds to HEAD with HTTP 405.
        """
        response = PostOnlyView.as_view()(self.rf.head('/'))
        self.assertEqual(response.status_code, 405)

    def test_get_and_post(self):
        """
        Test a view which only allows both GET and POST.
        """
        self._assert_simple(SimplePostView.as_view()(self.rf.get('/')))
        self._assert_simple(SimplePostView.as_view()(self.rf.post('/')))
        self.assertEqual(SimplePostView.as_view()(
            self.rf.get('/', REQUEST_METHOD='FAKE')
        ).status_code, 405)

    def test_invalid_keyword_argument(self):
        """
        Test that view arguments must be predefined on the class and can't
        be named like a HTTP method.
        """
        # Check each of the allowed method names
        for method in SimpleView.http_method_names:
            kwargs = dict(((method, "value"),))
            self.assertRaises(TypeError, SimpleView.as_view, **kwargs)

        # Check the case view argument is ok if predefined on the class...
        CustomizableView.as_view(parameter="value")
        # ...but raises errors otherwise.
        self.assertRaises(TypeError, CustomizableView.as_view, foobar="value")

    def test_calling_more_than_once(self):
        """
        Test a view can only be called once.
        """
        request = self.rf.get('/')
        view = InstanceView.as_view()
        self.assertNotEqual(view(request), view(request))

    def test_class_attributes(self):
        """
        Test that the callable returned from as_view() has proper
        docstring, name and module.
        """
        self.assertEqual(SimpleView.__doc__, SimpleView.as_view().__doc__)
        self.assertEqual(SimpleView.__name__, SimpleView.as_view().__name__)
        self.assertEqual(SimpleView.__module__, SimpleView.as_view().__module__)

    def test_dispatch_decoration(self):
        """
        Test that attributes set by decorators on the dispatch method
        are also present on the closure.
        """
        self.assertTrue(DecoratedDispatchView.as_view().is_decorated)

    def test_options(self):
        """
        Test that views respond to HTTP OPTIONS requests with an Allow header
        appropriate for the methods implemented by the view class.
        """
        request = self.rf.options('/')
        view = SimpleView.as_view()
        response = view(request)
        self.assertEqual(200, response.status_code)
        self.assertTrue(response['Allow'])

    def test_options_for_get_view(self):
        """
        Test that a view implementing GET allows GET and HEAD.
        """
        request = self.rf.options('/')
        view = SimpleView.as_view()
        response = view(request)
        self._assert_allows(response, 'GET', 'HEAD')

    def test_options_for_get_and_post_view(self):
        """
        Test that a view implementing GET and POST allows GET, HEAD, and POST.
        """
        request = self.rf.options('/')
        view = SimplePostView.as_view()
        response = view(request)
        self._assert_allows(response, 'GET', 'HEAD', 'POST')

    def test_options_for_post_view(self):
        """
        Test that a view implementing POST allows POST.
        """
        request = self.rf.options('/')
        view = PostOnlyView.as_view()
        response = view(request)
        self._assert_allows(response, 'POST')

    def _assert_allows(self, response, *expected_methods):
        "Assert allowed HTTP methods reported in the Allow response header"
        response_allows = set(response['Allow'].split(', '))
        self.assertEqual(set(expected_methods + ('OPTIONS',)), response_allows)

    def test_args_kwargs_request_on_self(self):
        """
        Test a view only has args, kwargs & request once `as_view`
        has been called.
        """
        bare_view = InstanceView()
        view = InstanceView.as_view()(self.rf.get('/'))
        for attribute in ('args', 'kwargs', 'request'):
            self.assertNotIn(attribute, dir(bare_view))
            self.assertIn(attribute, dir(view))

    def test_direct_instantiation(self):
        """
        It should be possible to use the view by directly instantiating it
        without going through .as_view() (#21564).
        """
        view = PostOnlyView()
        response = view.dispatch(self.rf.head('/'))
        self.assertEqual(response.status_code, 405)


@override_settings(ROOT_URLCONF='generic_views.urls')
class TemplateViewTest(TestCase):

    rf = RequestFactory()

    def _assert_about(self, response):
        response.render()
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<h1>About</h1>')

    def test_get(self):
        """
        Test a view that simply renders a template on GET
        """
        self._assert_about(AboutTemplateView.as_view()(self.rf.get('/about/')))

    def test_head(self):
        """
        Test a TemplateView responds correctly to HEAD
        """
        response = AboutTemplateView.as_view()(self.rf.head('/about/'))
        self.assertEqual(response.status_code, 200)

    def test_get_template_attribute(self):
        """
        Test a view that renders a template on GET with the template name as
        an attribute on the class.
        """
        self._assert_about(AboutTemplateAttributeView.as_view()(self.rf.get('/about/')))

    def test_get_generic_template(self):
        """
        Test a completely generic view that renders a template on GET
        with the template name as an argument at instantiation.
        """
        self._assert_about(TemplateView.as_view(template_name='generic_views/about.html')(self.rf.get('/about/')))

    def test_template_name_required(self):
        """
        A template view must provide a template name
        """
        self.assertRaises(ImproperlyConfigured, self.client.get, '/template/no_template/')

    def test_template_params(self):
        """
        A generic template view passes kwargs as context.
        """
        response = self.client.get('/template/simple/bar/')
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.context['foo'], 'bar')
        self.assertIsInstance(response.context['view'], View)

    def test_extra_template_params(self):
        """
        A template view can be customized to return extra context.
        """
        response = self.client.get('/template/custom/bar/')
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.context['foo'], 'bar')
        self.assertEqual(response.context['key'], 'value')
        self.assertIsInstance(response.context['view'], View)

    def test_cached_views(self):
        """
        A template view can be cached
        """
        response = self.client.get('/template/cached/bar/')
        self.assertEqual(response.status_code, 200)

        time.sleep(1.0)

        response2 = self.client.get('/template/cached/bar/')
        self.assertEqual(response2.status_code, 200)

        self.assertEqual(response.content, response2.content)

        time.sleep(2.0)

        # Let the cache expire and test again
        response2 = self.client.get('/template/cached/bar/')
        self.assertEqual(response2.status_code, 200)

        self.assertNotEqual(response.content, response2.content)

    def test_content_type(self):
        response = self.client.get('/template/content_type/')
        self.assertEqual(response['Content-Type'], 'text/plain')

    def test_resolve_view(self):
        match = resolve('/template/content_type/')
        self.assertIs(match.func.view_class, TemplateView)
        self.assertEqual(match.func.view_initkwargs['content_type'], 'text/plain')

    def test_resolve_login_required_view(self):
        match = resolve('/template/login_required/')
        self.assertIs(match.func.view_class, TemplateView)


@ignore_warnings(category=RemovedInDjango19Warning)
@override_settings(ROOT_URLCONF='generic_views.urls')
class RedirectViewTest(TestCase):

    rf = RequestFactory()

    def test_no_url(self):
        "Without any configuration, returns HTTP 410 GONE"
        response = RedirectView.as_view()(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 410)

    def test_permanent_redirect(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_temporary_redirect(self):
        "Permanent redirects are an option"
        response = RedirectView.as_view(url='/bar/', permanent=False)(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 302)
        self.assertEqual(response.url, '/bar/')

    def test_include_args(self):
        "GET arguments can be included in the redirected URL"
        response = RedirectView.as_view(url='/bar/')(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

        response = RedirectView.as_view(url='/bar/', query_string=True)(self.rf.get('/foo/?pork=spam'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/?pork=spam')

    def test_include_urlencoded_args(self):
        "GET arguments can be URL-encoded when included in the redirected URL"
        response = RedirectView.as_view(url='/bar/', query_string=True)(
            self.rf.get('/foo/?unicode=%E2%9C%93'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/?unicode=%E2%9C%93')

    def test_parameter_substitution(self):
        "Redirection URLs can be parameterized"
        response = RedirectView.as_view(url='/bar/%(object_id)d/')(self.rf.get('/foo/42/'), object_id=42)
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/42/')

    def test_named_url_pattern(self):
        "Named pattern parameter should reverse to the matching pattern"
        response = RedirectView.as_view(pattern_name='artist_detail')(self.rf.get('/foo/'), pk=1)
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/detail/artist/1/')

    def test_named_url_pattern_using_args(self):
        response = RedirectView.as_view(pattern_name='artist_detail')(self.rf.get('/foo/'), 1)
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/detail/artist/1/')

    def test_wrong_named_url_pattern(self):
        "A wrong pattern name returns 410 GONE"
        response = RedirectView.as_view(pattern_name='wrong.pattern_name')(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 410)

    def test_redirect_POST(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.post('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_redirect_HEAD(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.head('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_redirect_OPTIONS(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.options('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_redirect_PUT(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.put('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_redirect_PATCH(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.patch('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_redirect_DELETE(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.delete('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response.url, '/bar/')

    def test_redirect_when_meta_contains_no_query_string(self):
        "regression for #16705"
        # we can't use self.rf.get because it always sets QUERY_STRING
        response = RedirectView.as_view(url='/bar/')(self.rf.request(PATH_INFO='/foo/'))
        self.assertEqual(response.status_code, 301)

    def test_direct_instantiation(self):
        """
        It should be possible to use the view without going through .as_view()
        (#21564).
        """
        view = RedirectView()
        response = view.dispatch(self.rf.head('/foo/'))
        self.assertEqual(response.status_code, 410)


@override_settings(ROOT_URLCONF='generic_views.urls')
class RedirectViewDeprecationTest(TestCase):

    rf = RequestFactory()

    def test_deprecation_warning_init(self):
        with warnings.catch_warnings(record=True) as warns:
            warnings.simplefilter('always')

            view = RedirectView()
            response = view.dispatch(self.rf.head('/python/'))

        self.assertEqual(response.status_code, 410)
        self.assertEqual(len(warns), 1)
        self.assertIs(warns[0].category, RemovedInDjango19Warning)
        self.assertEqual(
            six.text_type(warns[0].message),
            "Default value of 'RedirectView.permanent' will change "
            "from True to False in Django 1.9. Set an explicit value "
            "to silence this warning.",
        )

    def test_deprecation_warning_raised_when_permanent_not_passed(self):
        with warnings.catch_warnings(record=True) as warns:
            warnings.simplefilter('always')

            view_function = RedirectView.as_view(url='/bbb/')
            request = self.rf.request(PATH_INFO='/aaa/')
            view_function(request)

        self.assertEqual(len(warns), 1)
        self.assertIs(warns[0].category, RemovedInDjango19Warning)
        self.assertEqual(
            six.text_type(warns[0].message),
            "Default value of 'RedirectView.permanent' will change "
            "from True to False in Django 1.9. Set an explicit value "
            "to silence this warning.",
        )

    def test_no_deprecation_warning_when_permanent_passed(self):
        with warnings.catch_warnings(record=True) as warns:
            warnings.simplefilter('always')

            view_function = RedirectView.as_view(url='/bar/', permanent=False)
            request = self.rf.request(PATH_INFO='/foo/')
            view_function(request)

        self.assertEqual(len(warns), 0)

    def test_no_deprecation_warning_with_custom_redirectview(self):
        class CustomRedirectView(RedirectView):
            permanent = False

        with warnings.catch_warnings(record=True) as warns:
            warnings.simplefilter('always')

            view_function = CustomRedirectView.as_view(url='/eggs/')
            request = self.rf.request(PATH_INFO='/spam/')
            view_function(request)

        self.assertEqual(len(warns), 0)


class GetContextDataTest(unittest.TestCase):

    def test_get_context_data_super(self):
        test_view = views.CustomContextView()
        context = test_view.get_context_data(kwarg_test='kwarg_value')

        # the test_name key is inserted by the test classes parent
        self.assertIn('test_name', context)
        self.assertEqual(context['kwarg_test'], 'kwarg_value')
        self.assertEqual(context['custom_key'], 'custom_value')

        # test that kwarg overrides values assigned higher up
        context = test_view.get_context_data(test_name='test_value')
        self.assertEqual(context['test_name'], 'test_value')

    def test_object_at_custom_name_in_context_data(self):
        # Checks 'pony' key presence in dict returned by get_context_date
        test_view = views.CustomSingleObjectView()
        test_view.context_object_name = 'pony'
        context = test_view.get_context_data()
        self.assertEqual(context['pony'], test_view.object)

    def test_object_in_get_context_data(self):
        # Checks 'object' key presence in dict returned by get_context_date #20234
        test_view = views.CustomSingleObjectView()
        context = test_view.get_context_data()
        self.assertEqual(context['object'], test_view.object)


class UseMultipleObjectMixinTest(unittest.TestCase):
    rf = RequestFactory()

    def test_use_queryset_from_view(self):
        test_view = views.CustomMultipleObjectMixinView()
        test_view.get(self.rf.get('/'))
        # Don't pass queryset as argument
        context = test_view.get_context_data()
        self.assertEqual(context['object_list'], test_view.queryset)

    def test_overwrite_queryset(self):
        test_view = views.CustomMultipleObjectMixinView()
        test_view.get(self.rf.get('/'))
        queryset = [{'name': 'Lennon'}, {'name': 'Ono'}]
        self.assertNotEqual(test_view.queryset, queryset)
        # Overwrite the view's queryset with queryset from kwarg
        context = test_view.get_context_data(object_list=queryset)
        self.assertEqual(context['object_list'], queryset)


class SingleObjectTemplateResponseMixinTest(unittest.TestCase):

    def test_template_mixin_without_template(self):
        """
        We want to makes sure that if you use a template mixin, but forget the
        template, it still tells you it's ImproperlyConfigured instead of
        TemplateDoesNotExist.
        """
        view = views.TemplateResponseWithoutTemplate()
        self.assertRaises(ImproperlyConfigured, view.get_template_names)