"""Creating a user in the admin pages: the password reaches the database only
hashed, and the configured password validators apply as on the change forms."""

from django.contrib.auth.models import Group, Permission, User
from django.db import connection
from django.test import TestCase, override_settings
from django.urls import reverse

from accounts.models import UserInstance
from computes.models import Compute
from instances.models import Instance

RAW = "Raw-Passw0rd-in-the-form"
LIMITS = {"role": "user", "max_instances": 1, "max_cpus": 1, "max_memory": 1, "max_disk_size": 4}


class UserCreateTests(TestCase):
    def setUp(self):
        self.client.force_login(User.objects.create_superuser("uc-admin", "uc@example.com", "pw"))
        self.change_password = Permission.objects.get(content_type__app_label="accounts", codename="change_password")

    def create(self, **data):
        return self.client.post(reverse("admin:user_create"), {"username": "newbie", "password": RAW, **LIMITS, **data})

    def test_the_raw_password_is_never_written(self):
        written = []

        def record(execute, sql, params, many, context):
            if RAW in repr(params):
                written.append(sql)
            return execute(sql, params, many, context)

        with connection.execute_wrapper(record):
            response = self.create()
        self.assertRedirects(response, reverse("admin:user_list"))
        self.assertEqual(written, [])
        self.assertTrue(User.objects.get(username="newbie").check_password(RAW))

    def test_groups_and_permissions_are_saved(self):
        group = Group.objects.create(name="uc-group")
        self.create(groups=[group.pk], user_permissions=[self.change_password.pk])
        user = User.objects.get(username="newbie")
        self.assertEqual(list(user.groups.all()), [group])
        self.assertEqual(list(user.user_permissions.all()), [self.change_password])

    def test_an_unticked_permission_stays_off(self):
        self.create()
        self.assertFalse(User.objects.get(username="newbie").user_permissions.exists())

    @override_settings(
        AUTH_PASSWORD_VALIDATORS=[
            {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator", "OPTIONS": {"min_length": 30}}
        ]
    )
    def test_configured_password_validators_apply(self):
        response = self.create()
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "at least 30 characters")
        self.assertFalse(User.objects.filter(username="newbie").exists())

    @override_settings(
        AUTH_PASSWORD_VALIDATORS=[{"NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator"}]
    )
    def test_the_password_is_checked_against_the_new_username(self):
        response = self.client.post(
            reverse("admin:user_create"), {"username": "rumpelstiltskin", "password": "rumpelstiltskin1", **LIMITS}
        )
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "too similar to the username")


class DefaultInstancesTests(TestCase):
    """NEW_USER_DEFAULT_INSTANCES names VMs, and a name may repeat across hosts."""

    def setUp(self):
        self.client.force_login(User.objects.create_superuser("uc-admin", "uc@example.com", "pw"))
        one, two = (Compute.objects.create(name=name, hostname="localhost", login="", password="", details="", type=4)
                    for name in ("uc-one", "uc-two"))
        self.web = Instance.objects.create(compute=one, name="web", uuid="00000000-0000-0000-0000-000000000001")
        for compute, uuid in ((one, "00000000-0000-0000-0000-000000000002"), (two, "00000000-0000-0000-0000-000000000003")):
            Instance.objects.create(compute=compute, name="db", uuid=uuid)

    def create(self):
        return self.client.post(reverse("admin:user_create"), {"username": "newbie", "password": RAW, **LIMITS})

    @override_settings(NEW_USER_DEFAULT_INSTANCES=["web"])
    def test_the_new_user_owns_the_named_vm(self):
        self.assertRedirects(self.create(), reverse("admin:user_list"))
        self.assertEqual([o.instance for o in UserInstance.objects.filter(user__username="newbie")], [self.web])

    def test_a_name_that_is_not_one_vm_is_refused_on_the_form(self):
        for name in ("no-such-vm", "db"):
            with self.subTest(name), override_settings(NEW_USER_DEFAULT_INSTANCES=["web", name]):
                response = self.create()
                self.assertContains(response, f"NEW_USER_DEFAULT_INSTANCES: {name} is not exactly one VM")
                self.assertFalse(User.objects.filter(username="newbie").exists())