import re
from io import StringIO

from django.core import management
from django.contrib.auth.models import User
from django.template import TemplateDoesNotExist
from django.test import TestCase
from django.test.client import Client
from django.test.utils import override_settings

from maintenancemode import utils

@override_settings(ROOT_URLCONF="maintenancemode.tests.urls", MAINTENANCE_MODE=False)
class MaintenanceModeMiddlewareTestCase(TestCase):

    def setUp(self):
        utils.deactivate()  # make sure maintenance mode is off

        self.user = User.objects.create_user(
            username="maintenance", email="maintenance@example.org", password="password"
        )

    def tearDown(self):
        self.user.delete()

    def test_default_middleware(self):
        # Middleware should default to being disabled
        response = self.client.get("/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_disabled_middleware(self):
        # Explicitly disabling the ``MAINTENANCE_MODE`` should work
        with self.settings(MAINTENANCE_MODE=False):
            response = self.client.get("/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_enabled_middleware_without_template(self):
        # Enabling the middleware without a proper 503 template should
        # raise a template error
        with self.settings(MAINTENANCE_MODE=True, TEMPLATES=[]):
            self.assertRaises(TemplateDoesNotExist, self.client.get, "/")

    def test_enabled_middleware_with_template(self):
        # Enabling the middleware having a ``503.html`` in any of the
        # template locations should return the rendered template"
        with self.settings(MAINTENANCE_MODE=True):
            response = self.client.get("/")
        self.assertContains(response, text="Temporary unavailable", count=1, status_code=503)
        self.assertContains(response, text="You requested: /", count=1, status_code=503)

    def test_middleware_with_non_staff_user(self):
        # A logged in user that is not a staff user should see the 503 message
        self.client.login(username="maintenance", password="password")

        with self.settings(MAINTENANCE_MODE=True):
            response = self.client.get("/")
        self.assertContains(response, text="Temporary unavailable", count=1, status_code=503)

    def test_middleware_with_staff_user(self):
        # A logged in user that _is_ a staff user should be able to
        # use the site normally
        User.objects.filter(pk=self.user.pk).update(is_staff=True)

        self.client.login(username="maintenance", password="password")

        with self.settings(MAINTENANCE_MODE=True):
            response = self.client.get("/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_middleware_with_staff_user_denied(self):
        # A logged in user that _is_ a staff user should be able to
        # use the site normally
        User.objects.filter(pk=self.user.pk).update(is_staff=True)

        self.client.login(username="maintenance", password="password")

        with self.settings(MAINTENANCE_MODE=True, MAINTENANCE_ALLOW_STAFF=False):
            response = self.client.get("/")
        self.assertContains(response, text="Temporary unavailable", count=1, status_code=503)

    def test_middleware_with_superuser_user_denied(self):
        # A logged in user that _is_ a staff user should be able to
        # use the site normally
        User.objects.filter(pk=self.user.pk).update(is_superuser=True)

        self.client.login(username="maintenance", password="password")

        with self.settings(MAINTENANCE_MODE=True, MAINTENANCE_ALLOW_SUPERUSER=False):
            response = self.client.get("/")
        self.assertContains(response, text="Temporary unavailable", count=1, status_code=503)

    def test_middleware_with_superuser_user_allowed(self):
        # A logged in user that _is_ a staff user should be able to
        # use the site normally
        User.objects.filter(pk=self.user.pk).update(is_superuser=True)

        self.client.login(username="maintenance", password="password")

        with self.settings(MAINTENANCE_MODE=True, MAINTENANCE_ALLOW_STAFF=False):
            response = self.client.get("/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_middleware_with_internal_ips(self):
        # A user that visits the site from an IP in ``INTERNAL_IPS``
        # should be able to use the site normally

        # Use a new Client instance to be able to set the REMOTE_ADDR used by INTERNAL_IPS
        client = Client(REMOTE_ADDR="127.0.0.1")

        with self.settings(MAINTENANCE_MODE=True, INTERNAL_IPS=("127.0.0.1",)):
            response = client.get("/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_middleware_with_internal_ips_range(self):
        client = Client(REMOTE_ADDR="10.10.10.1")

        with self.settings(MAINTENANCE_MODE=True, INTERNAL_IPS=("10.10.10.0/24",)):
            response = client.get("/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_ignored_path(self):
        # A path is ignored when applying the maintanance mode and
        # should be reachable normally
        with self.settings(MAINTENANCE_MODE=True):
            # Note that we cannot override the settings here, since they are
            # ONLY used when the middleware starts up.
            # For this reason, MAINTENANCE_IGNORE_URLS is set in the base
            # settings file.
            response = self.client.get("/ignored/")
        self.assertContains(response, text="Rendered response page", count=1, status_code=200)

    def test_management_command(self):
        out = StringIO()
        # Explicitly disabling the ``MAINTENANCE_MODE``
        with self.settings(MAINTENANCE_MODE=False):
            management.call_command("maintenance", "on", stdout=out)
            self.assertContains(self.client.get("/"), text="Temporary unavailable", count=1, status_code=503)

            management.call_command("maintenance", "off", stdout=out)
            self.assertContains(self.client.get("/"), text="Rendered response page", count=1, status_code=200)