from django.conf import settings
from django.contrib.sites.managers import CurrentSiteManager
from django.contrib.sites.models import Site
from django.core import checks
from django.db import models
from django.test import SimpleTestCase, TestCase
from django.test.utils import isolate_apps

from .models import CustomArticle, ExclusiveArticle, SyndicatedArticle


class SitesFrameworkTestCase(TestCase):
    @classmethod
    def setUpTestData(cls):
        Site.objects.get_or_create(
            id=settings.SITE_ID, domain="example.com", name="example.com"
        )
        Site.objects.create(
            id=settings.SITE_ID + 1, domain="example2.com", name="example2.com"
        )

    def test_site_fk(self):
        article = ExclusiveArticle.objects.create(
            title="Breaking News!", site_id=settings.SITE_ID
        )
        self.assertEqual(ExclusiveArticle.on_site.get(), article)

    def test_sites_m2m(self):
        article = SyndicatedArticle.objects.create(title="Fresh News!")
        article.sites.add(Site.objects.get(id=settings.SITE_ID))
        article.sites.add(Site.objects.get(id=settings.SITE_ID + 1))
        article2 = SyndicatedArticle.objects.create(title="More News!")
        article2.sites.add(Site.objects.get(id=settings.SITE_ID + 1))
        self.assertEqual(SyndicatedArticle.on_site.get(), article)

    def test_custom_named_field(self):
        article = CustomArticle.objects.create(
            title="Tantalizing News!",
            places_this_article_should_appear_id=settings.SITE_ID,
        )
        self.assertEqual(CustomArticle.on_site.get(), article)


@isolate_apps("sites_framework")
class CurrentSiteManagerChecksTests(SimpleTestCase):
    def test_invalid_name(self):
        class InvalidArticle(models.Model):
            on_site = CurrentSiteManager("places_this_article_should_appear")

        errors = InvalidArticle.check()
        expected = [
            checks.Error(
                "CurrentSiteManager could not find a field named "
                "'places_this_article_should_appear'.",
                obj=InvalidArticle.on_site,
                id="sites.E001",
            )
        ]
        self.assertEqual(errors, expected)

    def test_invalid_field_type(self):
        class ConfusedArticle(models.Model):
            site = models.IntegerField()
            on_site = CurrentSiteManager()

        errors = ConfusedArticle.check()
        expected = [
            checks.Error(
                "CurrentSiteManager cannot use 'ConfusedArticle.site' as it is "
                "not a foreign key or a many-to-many field.",
                obj=ConfusedArticle.on_site,
                id="sites.E002",
            )
        ]
        self.assertEqual(errors, expected)