import datetime
import email
import urllib.parse

from django.test import TestCase
from django.urls import reverse

from bookmarks.tests.helpers import BookmarkFactoryMixin
from bookmarks.models import FeedToken, User


def rfc2822_date(date):
    if not isinstance(date, datetime.datetime):
        date = datetime.datetime.combine(date, datetime.time())
    return email.utils.format_datetime(date)


class FeedsTestCase(TestCase, BookmarkFactoryMixin):

    def setUp(self) -> None:
        user = self.get_or_create_test_user()
        self.client.force_login(user)
        self.token = FeedToken.objects.get_or_create(user=user)[0]

    def test_all_returns_404_for_unknown_feed_token(self):
        response = self.client.get(reverse('bookmarks:feeds.all', args=['foo']))

        self.assertEqual(response.status_code, 404)

    def test_all_metadata(self):
        feed_url = reverse('bookmarks:feeds.all', args=[self.token.key])
        response = self.client.get(feed_url)
        self.assertEqual(response.status_code, 200)

        self.assertContains(response, '<title>All bookmarks</title>')
        self.assertContains(response, '<description>All bookmarks</description>')
        self.assertContains(response, f'<link>http://testserver{feed_url}</link>')
        self.assertContains(response, f'<atom:link href="http://testserver{feed_url}" rel="self"></atom:link>')

    def test_all_returns_all_unarchived_bookmarks(self):
        bookmarks = [
            self.setup_bookmark(),
            self.setup_bookmark(),
            self.setup_bookmark(unread=True),
        ]
        self.setup_bookmark(is_archived=True)
        self.setup_bookmark(is_archived=True)
        self.setup_bookmark(is_archived=True)

        response = self.client.get(reverse('bookmarks:feeds.all', args=[self.token.key]))
        self.assertEqual(response.status_code, 200)

        self.assertContains(response, '<item>', count=len(bookmarks))

        for bookmark in bookmarks:
            expected_item = '<item>' \
                            f'<title>{bookmark.resolved_title}</title>' \
                            f'<link>{bookmark.url}</link>' \
                            f'<description>{bookmark.resolved_description}</description>' \
                            f'<pubDate>{rfc2822_date(bookmark.date_added)}</pubDate>' \
                            f'<guid>{bookmark.url}</guid>' \
                            '</item>'
            self.assertContains(response, expected_item, count=1)

    def test_all_with_query(self):
        tag1 = self.setup_tag()
        bookmark1 = self.setup_bookmark()
        bookmark2 = self.setup_bookmark(tags=[tag1])
        bookmark3 = self.setup_bookmark(tags=[tag1])

        self.setup_bookmark()
        self.setup_bookmark()
        self.setup_bookmark()

        feed_url = reverse('bookmarks:feeds.all', args=[self.token.key])

        url = feed_url + f'?q={bookmark1.title}'
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<item>', count=1)
        self.assertContains(response, f'<guid>{bookmark1.url}</guid>', count=1)

        url = feed_url + '?q=' + urllib.parse.quote('#' + tag1.name)
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<item>', count=2)
        self.assertContains(response, f'<guid>{bookmark2.url}</guid>', count=1)
        self.assertContains(response, f'<guid>{bookmark3.url}</guid>', count=1)

        url = feed_url + '?q=' + urllib.parse.quote(f'#{tag1.name} {bookmark2.title}')
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<item>', count=1)
        self.assertContains(response, f'<guid>{bookmark2.url}</guid>', count=1)

    def test_all_returns_only_user_owned_bookmarks(self):
        other_user = User.objects.create_user('otheruser', 'otheruser@example.com', 'password123')
        self.setup_bookmark(unread=True, user=other_user)
        self.setup_bookmark(unread=True, user=other_user)
        self.setup_bookmark(unread=True, user=other_user)

        response = self.client.get(reverse('bookmarks:feeds.all', args=[self.token.key]))
        self.assertEqual(response.status_code, 200)

        self.assertContains(response, '<item>', count=0)

    def test_unread_returns_404_for_unknown_feed_token(self):
        response = self.client.get(reverse('bookmarks:feeds.unread', args=['foo']))

        self.assertEqual(response.status_code, 404)

    def test_unread_metadata(self):
        feed_url = reverse('bookmarks:feeds.unread', args=[self.token.key])
        response = self.client.get(feed_url)
        self.assertEqual(response.status_code, 200)

        self.assertContains(response, '<title>Unread bookmarks</title>')
        self.assertContains(response, '<description>All unread bookmarks</description>')
        self.assertContains(response, f'<link>http://testserver{feed_url}</link>')
        self.assertContains(response, f'<atom:link href="http://testserver{feed_url}" rel="self"></atom:link>')

    def test_unread_returns_unread_and_unarchived_bookmarks(self):
        self.setup_bookmark(unread=False)
        self.setup_bookmark(unread=False)
        self.setup_bookmark(unread=False)
        self.setup_bookmark(unread=True, is_archived=True)
        self.setup_bookmark(unread=True, is_archived=True)
        self.setup_bookmark(unread=False, is_archived=True)

        unread_bookmarks = [
            self.setup_bookmark(unread=True),
            self.setup_bookmark(unread=True),
            self.setup_bookmark(unread=True),
        ]

        response = self.client.get(reverse('bookmarks:feeds.unread', args=[self.token.key]))
        self.assertEqual(response.status_code, 200)

        self.assertContains(response, '<item>', count=len(unread_bookmarks))

        for bookmark in unread_bookmarks:
            expected_item = '<item>' \
                            f'<title>{bookmark.resolved_title}</title>' \
                            f'<link>{bookmark.url}</link>' \
                            f'<description>{bookmark.resolved_description}</description>' \
                            f'<pubDate>{rfc2822_date(bookmark.date_added)}</pubDate>' \
                            f'<guid>{bookmark.url}</guid>' \
                            '</item>'
            self.assertContains(response, expected_item, count=1)

    def test_unread_with_query(self):
        tag1 = self.setup_tag()
        bookmark1 = self.setup_bookmark(unread=True)
        bookmark2 = self.setup_bookmark(unread=True, tags=[tag1])
        bookmark3 = self.setup_bookmark(unread=True, tags=[tag1])

        self.setup_bookmark(unread=True)
        self.setup_bookmark(unread=True)
        self.setup_bookmark(unread=True)

        feed_url = reverse('bookmarks:feeds.all', args=[self.token.key])

        url = feed_url + f'?q={bookmark1.title}'
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<item>', count=1)
        self.assertContains(response, f'<guid>{bookmark1.url}</guid>', count=1)

        url = feed_url + '?q=' + urllib.parse.quote('#' + tag1.name)
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<item>', count=2)
        self.assertContains(response, f'<guid>{bookmark2.url}</guid>', count=1)
        self.assertContains(response, f'<guid>{bookmark3.url}</guid>', count=1)

        url = feed_url + '?q=' + urllib.parse.quote(f'#{tag1.name} {bookmark2.title}')
        response = self.client.get(url)
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<item>', count=1)
        self.assertContains(response, f'<guid>{bookmark2.url}</guid>', count=1)

    def test_unread_returns_only_user_owned_bookmarks(self):
        other_user = User.objects.create_user('otheruser', 'otheruser@example.com', 'password123')
        self.setup_bookmark(unread=True, user=other_user)
        self.setup_bookmark(unread=True, user=other_user)
        self.setup_bookmark(unread=True, user=other_user)

        response = self.client.get(reverse('bookmarks:feeds.unread', args=[self.token.key]))
        self.assertEqual(response.status_code, 200)

        self.assertContains(response, '<item>', count=0)