import datetime
from unittest import mock

from django.test import SimpleTestCase
from django.utils import feedgenerator
from django.utils.functional import SimpleLazyObject
from django.utils.timezone import get_fixed_timezone


class FeedgeneratorTests(SimpleTestCase):
    """
    Tests for the low-level syndication feed framework.
    """

    def test_get_tag_uri(self):
        """
        get_tag_uri() correctly generates TagURIs.
        """
        self.assertEqual(
            feedgenerator.get_tag_uri(
                "http://example.org/foo/bar#headline", datetime.date(2004, 10, 25)
            ),
            "tag:example.org,2004-10-25:/foo/bar/headline",
        )

    def test_get_tag_uri_with_port(self):
        """
        get_tag_uri() correctly generates TagURIs from URLs with port numbers.
        """
        self.assertEqual(
            feedgenerator.get_tag_uri(
                "http://www.example.org:8000/2008/11/14/django#headline",
                datetime.datetime(2008, 11, 14, 13, 37, 0),
            ),
            "tag:www.example.org,2008-11-14:/2008/11/14/django/headline",
        )

    def test_rfc2822_date(self):
        """
        rfc2822_date() correctly formats datetime objects.
        """
        self.assertEqual(
            feedgenerator.rfc2822_date(datetime.datetime(2008, 11, 14, 13, 37, 0)),
            "Fri, 14 Nov 2008 13:37:00 -0000",
        )

    def test_rfc2822_date_with_timezone(self):
        """
        rfc2822_date() correctly formats datetime objects with tzinfo.
        """
        self.assertEqual(
            feedgenerator.rfc2822_date(
                datetime.datetime(
                    2008, 11, 14, 13, 37, 0, tzinfo=get_fixed_timezone(60)
                )
            ),
            "Fri, 14 Nov 2008 13:37:00 +0100",
        )

    def test_rfc2822_date_without_time(self):
        """
        rfc2822_date() correctly formats date objects.
        """
        self.assertEqual(
            feedgenerator.rfc2822_date(datetime.date(2008, 11, 14)),
            "Fri, 14 Nov 2008 00:00:00 -0000",
        )

    def test_rfc3339_date(self):
        """
        rfc3339_date() correctly formats datetime objects.
        """
        self.assertEqual(
            feedgenerator.rfc3339_date(datetime.datetime(2008, 11, 14, 13, 37, 0)),
            "2008-11-14T13:37:00Z",
        )

    def test_rfc3339_date_with_timezone(self):
        """
        rfc3339_date() correctly formats datetime objects with tzinfo.
        """
        self.assertEqual(
            feedgenerator.rfc3339_date(
                datetime.datetime(
                    2008, 11, 14, 13, 37, 0, tzinfo=get_fixed_timezone(120)
                )
            ),
            "2008-11-14T13:37:00+02:00",
        )

    def test_rfc3339_date_without_time(self):
        """
        rfc3339_date() correctly formats date objects.
        """
        self.assertEqual(
            feedgenerator.rfc3339_date(datetime.date(2008, 11, 14)),
            "2008-11-14T00:00:00Z",
        )

    def test_atom1_mime_type(self):
        """
        Atom MIME type has UTF8 Charset parameter set
        """
        atom_feed = feedgenerator.Atom1Feed("title", "link", "description")
        self.assertEqual(atom_feed.content_type, "application/atom+xml; charset=utf-8")

    def test_rss_mime_type(self):
        """
        RSS MIME type has UTF8 Charset parameter set
        """
        rss_feed = feedgenerator.Rss201rev2Feed("title", "link", "description")
        self.assertEqual(rss_feed.content_type, "application/rss+xml; charset=utf-8")

    # Two regression tests for #14202

    def test_feed_without_feed_url_gets_rendered_without_atom_link(self):
        feed = feedgenerator.Rss201rev2Feed("title", "/link/", "descr")
        self.assertIsNone(feed.feed["feed_url"])
        feed_content = feed.writeString("utf-8")
        self.assertNotIn("<atom:link", feed_content)
        self.assertNotIn('href="/feed/"', feed_content)
        self.assertNotIn('rel="self"', feed_content)

    def test_feed_with_feed_url_gets_rendered_with_atom_link(self):
        feed = feedgenerator.Rss201rev2Feed(
            "title", "/link/", "descr", feed_url="/feed/"
        )
        self.assertEqual(feed.feed["feed_url"], "/feed/")
        feed_content = feed.writeString("utf-8")
        self.assertIn("<atom:link", feed_content)
        self.assertIn('href="/feed/"', feed_content)
        self.assertIn('rel="self"', feed_content)

    def test_atom_add_item(self):
        # Not providing any optional arguments to Atom1Feed.add_item()
        feed = feedgenerator.Atom1Feed("title", "/link/", "descr")
        feed.add_item("item_title", "item_link", "item_description")
        feed.writeString("utf-8")

    def test_deterministic_attribute_order(self):
        feed = feedgenerator.Atom1Feed("title", "/link/", "desc")
        feed_content = feed.writeString("utf-8")
        self.assertIn('href="/link/" rel="alternate"', feed_content)

    def test_latest_post_date_returns_utc_time(self):
        for use_tz in (True, False):
            with self.settings(USE_TZ=use_tz):
                rss_feed = feedgenerator.Rss201rev2Feed("title", "link", "description")
                self.assertEqual(
                    rss_feed.latest_post_date().tzinfo,
                    datetime.timezone.utc,
                )

    def test_stylesheet_keeps_lazy_urls(self):
        m = mock.Mock(return_value="test.css")
        stylesheet = feedgenerator.Stylesheet(SimpleLazyObject(m))
        m.assert_not_called()
        self.assertEqual(
            str(stylesheet), 'href="test.css" type="text/css" media="screen"'
        )
        m.assert_called_once()
