from unittest import mock

from django.contrib import admin
from django.contrib.auth.models import User
from django.test import TestCase, override_settings
from django.urls import path, reverse

from .models import Book


class Router:
    target_db = None

    def db_for_read(self, model, **hints):
        return self.target_db

    db_for_write = db_for_read

    def allow_relation(self, obj1, obj2, **hints):
        return True


site = admin.AdminSite(name="test_adminsite")
site.register(Book)

urlpatterns = [
    path("admin/", site.urls),
]


@override_settings(ROOT_URLCONF=__name__, DATABASE_ROUTERS=["%s.Router" % __name__])
class MultiDatabaseTests(TestCase):
    databases = {"default", "other"}

    @classmethod
    def setUpTestData(cls):
        cls.superusers = {}
        cls.test_book_ids = {}
        for db in cls.databases:
            Router.target_db = db
            cls.superusers[db] = User.objects.create_superuser(
                username="admin",
                password="something",
                email="test@test.org",
            )
            b = Book(name="Test Book")
            b.save(using=db)
            cls.test_book_ids[db] = b.id

    @mock.patch("django.contrib.admin.options.transaction")
    def test_add_view(self, mock):
        for db in self.databases:
            with self.subTest(db=db):
                Router.target_db = db
                self.client.force_login(self.superusers[db])
                self.client.post(
                    reverse("test_adminsite:admin_views_book_add"),
                    {"name": "Foobar: 5th edition"},
                )
                mock.atomic.assert_called_with(using=db)

    @mock.patch("django.contrib.admin.options.transaction")
    def test_change_view(self, mock):
        for db in self.databases:
            with self.subTest(db=db):
                Router.target_db = db
                self.client.force_login(self.superusers[db])
                self.client.post(
                    reverse(
                        "test_adminsite:admin_views_book_change",
                        args=[self.test_book_ids[db]],
                    ),
                    {"name": "Test Book 2: Test more"},
                )
                mock.atomic.assert_called_with(using=db)

    @mock.patch("django.contrib.admin.options.transaction")
    def test_delete_view(self, mock):
        for db in self.databases:
            with self.subTest(db=db):
                Router.target_db = db
                self.client.force_login(self.superusers[db])
                self.client.post(
                    reverse(
                        "test_adminsite:admin_views_book_delete",
                        args=[self.test_book_ids[db]],
                    ),
                    {"post": "yes"},
                )
                mock.atomic.assert_called_with(using=db)