# Copyright 2012 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Copyright 2012 OpenStack Foundation
# Copyright 2012 Nebula, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

from importlib import import_module

import six
from six import moves

from django.conf import settings
from django.contrib.auth.models import User
from django.core.exceptions import ImproperlyConfigured
from django import urls

import horizon
from horizon import base
from horizon import conf
from horizon.test import helpers as test
from horizon.test.test_dashboards.cats.dashboard import Cats
from horizon.test.test_dashboards.cats.kittens.panel import Kittens
from horizon.test.test_dashboards.cats.tigers.panel import Tigers
from horizon.test.test_dashboards.dogs.dashboard import Dogs
from horizon.test.test_dashboards.dogs.puppies.panel import Puppies


class MyDash(horizon.Dashboard):
    name = "My Dashboard"
    slug = "mydash"
    default_panel = "myslug"


class MyPanel(horizon.Panel):
    name = "My Panel"
    slug = "myslug"
    urls = 'horizon.test.test_dashboards.cats.kittens.urls'


class AdminPanel(horizon.Panel):
    name = "Admin Panel"
    slug = "admin_panel"
    permissions = ("horizon.test",)
    urls = 'horizon.test.test_dashboards.cats.kittens.urls'


class RbacNoAccessPanel(horizon.Panel):
    name = "RBAC Panel No"
    slug = "rbac_panel_no"

    def allowed(self, context):
        return False


class RbacYesAccessPanel(horizon.Panel):
    name = "RBAC Panel Yes"
    slug = "rbac_panel_yes"


class BaseHorizonTests(test.TestCase):

    def setUp(self):
        super(BaseHorizonTests, self).setUp()
        # Adjust our horizon config and register our custom dashboards/panels.
        self.old_default_dash = settings.HORIZON_CONFIG['default_dashboard']
        settings.HORIZON_CONFIG['default_dashboard'] = 'cats'
        self.old_dashboards = settings.HORIZON_CONFIG['dashboards']
        settings.HORIZON_CONFIG['dashboards'] = ('cats', 'dogs')
        base.Horizon.register(Cats)
        base.Horizon.register(Dogs)
        Cats.register(Kittens)
        Cats.register(Tigers)
        Dogs.register(Puppies)
        # Trigger discovery, registration, and URLconf generation if it
        # hasn't happened yet.
        base.Horizon._urls()
        # Store our original dashboards
        self._discovered_dashboards = list(base.Horizon._registry)
        # Gather up and store our original panels for each dashboard
        self._discovered_panels = {}
        for dash in self._discovered_dashboards:
            panels = list(base.Horizon._registry[dash]._registry)
            self._discovered_panels[dash] = panels

    def tearDown(self):
        super(BaseHorizonTests, self).tearDown()
        # Restore our settings
        settings.HORIZON_CONFIG['default_dashboard'] = self.old_default_dash
        settings.HORIZON_CONFIG['dashboards'] = self.old_dashboards
        # Destroy our singleton and re-create it.
        base.HorizonSite._instance = None
        del base.Horizon
        base.Horizon = base.HorizonSite()
        # Reload the convenience references to Horizon stored in __init__
        moves.reload_module(import_module("horizon"))
        # Re-register our original dashboards and panels.
        # This is necessary because autodiscovery only works on the first
        # import, and calling reload introduces innumerable additional
        # problems. Manual re-registration is the only good way for testing.
        self._discovered_dashboards.remove(Cats)
        self._discovered_dashboards.remove(Dogs)
        for dash in self._discovered_dashboards:
            base.Horizon.register(dash)
            for panel in self._discovered_panels[dash]:
                dash.register(panel)

    def _reload_urls(self):
        """Clears out the URL caches, and reloads the root urls module.

        It re-triggers the autodiscovery mechanism for Horizon.
        Allows URLs to be re-calculated after registering new dashboards.
        Useful only for testing and should never be used on a live site.
        """
        urls.clear_url_caches()
        moves.reload_module(import_module(settings.ROOT_URLCONF))
        base.Horizon._urls()


class HorizonTests(BaseHorizonTests):

    def test_registry(self):
        """Verify registration and autodiscovery work correctly.

        Please note that this implicitly tests that autodiscovery works
        by virtue of the fact that the dashboards listed in
        ``settings.INSTALLED_APPS`` are loaded from the start.
        """
        # Registration
        self.assertEqual(2, len(base.Horizon._registry))
        horizon.register(MyDash)
        self.assertEqual(3, len(base.Horizon._registry))
        with self.assertRaises(ValueError):
            horizon.register(MyPanel)
        with self.assertRaises(ValueError):
            horizon.register("MyPanel")

        # Retrieval
        my_dash_instance_by_name = horizon.get_dashboard("mydash")
        self.assertIsInstance(my_dash_instance_by_name, MyDash)
        my_dash_instance_by_class = horizon.get_dashboard(MyDash)
        self.assertEqual(my_dash_instance_by_name, my_dash_instance_by_class)
        with self.assertRaises(base.NotRegistered):
            horizon.get_dashboard("fake")
        self.assertQuerysetEqual(horizon.get_dashboards(),
                                 ['<Dashboard: cats>',
                                  '<Dashboard: dogs>',
                                  '<Dashboard: mydash>'])

        # Removal
        self.assertEqual(3, len(base.Horizon._registry))
        horizon.unregister(MyDash)
        self.assertEqual(2, len(base.Horizon._registry))
        with self.assertRaises(base.NotRegistered):
            horizon.get_dashboard(MyDash)

    def test_site(self):
        self.assertEqual("Horizon", six.text_type(base.Horizon))
        self.assertEqual("<Site: horizon>", repr(base.Horizon))
        dash = base.Horizon.get_dashboard('cats')
        self.assertEqual(dash, base.Horizon.get_default_dashboard())
        test_user = User()
        self.assertEqual(dash.get_absolute_url(),
                         base.Horizon.get_user_home(test_user))

    def test_dashboard(self):
        cats = horizon.get_dashboard("cats")
        self.assertEqual(base.Horizon, cats._registered_with)
        self.assertQuerysetEqual(cats.get_panels(),
                                 ['<Panel: kittens>',
                                  '<Panel: tigers>'])
        self.assertEqual("/cats/", cats.get_absolute_url())
        self.assertEqual("Cats", cats.name)

        # Test registering a module with a dashboard that defines panels
        # as a panel group.
        cats.register(MyPanel)
        self.assertQuerysetEqual(cats.get_panel_groups()['other'],
                                 ['<Panel: myslug>'])

        # Test that panels defined as a tuple still return a PanelGroup
        dogs = horizon.get_dashboard("dogs")
        self.assertQuerysetEqual(dogs.get_panel_groups().values(),
                                 ['<PanelGroup: default>'])

        # Test registering a module with a dashboard that defines panels
        # as a tuple.
        dogs = horizon.get_dashboard("dogs")
        dogs.register(MyPanel)
        self.assertQuerysetEqual(dogs.get_panels(),
                                 ['<Panel: puppies>',
                                  '<Panel: myslug>'])

    def test_panels(self):
        cats = horizon.get_dashboard("cats")
        tigers = cats.get_panel("tigers")
        self.assertEqual(cats, tigers._registered_with)
        self.assertEqual("/cats/tigers/", tigers.get_absolute_url())

    def test_panel_without_slug_fails(self):
        class InvalidPanel(horizon.Panel):
            name = 'Invalid'

        self.assertRaises(ImproperlyConfigured, InvalidPanel)

    def test_registry_without_registerable_class_attr_fails(self):
        class InvalidRegistry(base.Registry):
            pass

        self.assertRaises(ImproperlyConfigured, InvalidRegistry)

    def test_index_url_name(self):
        cats = horizon.get_dashboard("cats")
        tigers = cats.get_panel("tigers")
        tigers.index_url_name = "does_not_exist"
        with self.assertRaises(urls.NoReverseMatch):
            tigers.get_absolute_url()
        tigers.index_url_name = "index"
        self.assertEqual("/cats/tigers/", tigers.get_absolute_url())

    def test_lazy_urls(self):
        urlpatterns = horizon.urls[0]
        self.assertIsInstance(urlpatterns, base.LazyURLPattern)
        # The following two methods simply should not raise any exceptions
        iter(urlpatterns)
        reversed(urlpatterns)

    def test_horizon_test_isolation_1(self):
        """Isolation Test Part 1: sets a value."""
        cats = horizon.get_dashboard("cats")
        cats.evil = True

    def test_horizon_test_isolation_2(self):
        """Isolation Test Part 2: The value set in part 1 should be gone."""
        cats = horizon.get_dashboard("cats")
        self.assertFalse(hasattr(cats, "evil"))

    def test_public(self):
        dogs = horizon.get_dashboard("dogs")
        # Known to have no restrictions on it other than being logged in.
        puppies = dogs.get_panel("puppies")
        url = puppies.get_absolute_url()

        # Get a clean, logged out client instance.
        self.client.logout()

        resp = self.client.get(url)
        redirect_url = "?".join(['http://testserver' + settings.LOGIN_URL,
                                 "next=%s" % url])
        self.assertRedirects(resp, redirect_url)

        # Simulate ajax call
        resp = self.client.get(url, HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        # Response should be HTTP 401 with redirect header
        self.assertEqual(401, resp.status_code)
        self.assertEqual(redirect_url,
                         resp["X-Horizon-Location"])

    def test_required_permissions(self):
        dash = horizon.get_dashboard("cats")
        panel = dash.get_panel('tigers')

        # Non-admin user
        self.assertQuerysetEqual(self.user.get_all_permissions(), [])

        resp = self.client.get(panel.get_absolute_url())
        self.assertEqual(403, resp.status_code)

        resp = self.client.get(panel.get_absolute_url(),
                               follow=False,
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        self.assertEqual(403, resp.status_code)

        # Test insufficient permissions for logged-in user
        resp = self.client.get(panel.get_absolute_url(), follow=True)
        self.assertEqual(403, resp.status_code)
        self.assertTemplateUsed(resp, "not_authorized.html")

        # Set roles for admin user
        self.set_permissions(permissions=['test'])

        resp = self.client.get(panel.get_absolute_url())
        self.assertEqual(200, resp.status_code)

        # Test modal form
        resp = self.client.get(panel.get_absolute_url(),
                               follow=False,
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        self.assertEqual(200, resp.status_code)

    def test_ssl_redirect_by_proxy(self):
        dogs = horizon.get_dashboard("dogs")
        puppies = dogs.get_panel("puppies")
        url = puppies.get_absolute_url()
        redirect_url = "?".join([settings.LOGIN_URL,
                                 "next=%s" % url])

        self.client.logout()
        resp = self.client.get(url)
        self.assertRedirects(resp, settings.TESTSERVER + redirect_url)

        # Set SSL settings for test server
        settings.SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTOCOL',
                                            'https')

        resp = self.client.get(url, HTTP_X_FORWARDED_PROTOCOL="https")
        self.assertEqual(302, resp.status_code)
        self.assertEqual('https://testserver:80%s' % redirect_url,
                         resp['location'])

        # Restore settings
        settings.SECURE_PROXY_SSL_HEADER = None


class GetUserHomeTests(BaseHorizonTests):
    """Test get_user_home parameters."""

    def setUp(self):
        self.orig_user_home = settings.HORIZON_CONFIG['user_home']
        super(BaseHorizonTests, self).setUp()
        self.original_username = "testname"
        self.test_user = User()
        self.test_user.username = self.original_username

    def tearDown(self):
        settings.HORIZON_CONFIG['user_home'] = self.orig_user_home
        conf.HORIZON_CONFIG._setup()

    def test_using_callable(self):
        def themable_user_fnc(user):
            return user.username.upper()

        settings.HORIZON_CONFIG['user_home'] = themable_user_fnc
        conf.HORIZON_CONFIG._setup()

        self.assertEqual(self.test_user.username.upper(),
                         base.Horizon.get_user_home(self.test_user))

    def test_using_module_function(self):
        module_func = 'django.utils.encoding.force_text'
        settings.HORIZON_CONFIG['user_home'] = module_func
        conf.HORIZON_CONFIG._setup()

        self.test_user.username = 'testname'
        self.assertEqual(self.original_username,
                         base.Horizon.get_user_home(self.test_user))

    def test_using_url(self):
        fixed_url = "/url"
        settings.HORIZON_CONFIG['user_home'] = fixed_url
        conf.HORIZON_CONFIG._setup()

        self.assertEqual(fixed_url,
                         base.Horizon.get_user_home(self.test_user))


class CustomPanelTests(BaseHorizonTests):

    """Test customization of dashboards and panels.

    This tests customization using 'customization_module' to HORIZON_CONFIG.
    """

    def setUp(self):
        super(CustomPanelTests, self).setUp()
        settings.HORIZON_CONFIG['customization_module'] = \
            'horizon.test.customization.cust_test1'
        # refresh config
        conf.HORIZON_CONFIG._setup()
        self._reload_urls()

    def tearDown(self):
        # Restore dash
        cats = horizon.get_dashboard("cats")
        cats.name = "Cats"
        horizon.register(Dogs)
        self._discovered_dashboards.append(Dogs)
        Dogs.register(Puppies)
        Cats.register(Tigers)
        super(CustomPanelTests, self).tearDown()
        settings.HORIZON_CONFIG.pop('customization_module')
        # refresh config
        conf.HORIZON_CONFIG._setup()

    def test_customize_dashboard(self):
        cats = horizon.get_dashboard("cats")
        self.assertEqual("WildCats", cats.name)
        self.assertQuerysetEqual(cats.get_panels(),
                                 ['<Panel: kittens>'])
        with self.assertRaises(base.NotRegistered):
            horizon.get_dashboard("dogs")


class CustomPermissionsTests(BaseHorizonTests):

    """Test customization of permissions on panels.

    This tests customization using 'customization_module' to HORIZON_CONFIG.
    """

    def setUp(self):
        settings.HORIZON_CONFIG['customization_module'] = \
            'horizon.test.customization.cust_test2'
        # refresh config
        conf.HORIZON_CONFIG._setup()
        super(CustomPermissionsTests, self).setUp()

    def tearDown(self):
        # Restore permissions
        dogs = horizon.get_dashboard("dogs")
        puppies = dogs.get_panel("puppies")
        puppies.permissions = tuple([])
        super(CustomPermissionsTests, self).tearDown()
        settings.HORIZON_CONFIG.pop('customization_module')
        # refresh config
        conf.HORIZON_CONFIG._setup()

    def test_customized_permissions(self):
        dogs = horizon.get_dashboard("dogs")
        panel = dogs.get_panel('puppies')

        # Non-admin user
        self.assertQuerysetEqual(self.user.get_all_permissions(), [])

        resp = self.client.get(panel.get_absolute_url())
        self.assertEqual(403, resp.status_code)

        resp = self.client.get(panel.get_absolute_url(),
                               follow=False,
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        self.assertEqual(403, resp.status_code)

        # Test customized permissions for logged-in user
        resp = self.client.get(panel.get_absolute_url(), follow=True)
        self.assertEqual(403, resp.status_code)
        self.assertTemplateUsed(resp, "not_authorized.html")

        # Set roles for admin user
        self.set_permissions(permissions=['test'])

        resp = self.client.get(panel.get_absolute_url())
        self.assertEqual(200, resp.status_code)

        # Test modal form
        resp = self.client.get(panel.get_absolute_url(),
                               follow=False,
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        self.assertEqual(resp.status_code, 200)


class RbacHorizonTests(test.TestCase):

    def setUp(self):
        super(RbacHorizonTests, self).setUp()
        # Adjust our horizon config and register our custom dashboards/panels.
        self.old_default_dash = settings.HORIZON_CONFIG['default_dashboard']
        settings.HORIZON_CONFIG['default_dashboard'] = 'cats'
        self.old_dashboards = settings.HORIZON_CONFIG['dashboards']
        settings.HORIZON_CONFIG['dashboards'] = ('cats', 'dogs')
        base.Horizon.register(Cats)
        base.Horizon.register(Dogs)
        Cats.register(RbacNoAccessPanel)
        Cats.default_panel = 'rbac_panel_no'
        Dogs.register(RbacYesAccessPanel)
        Dogs.default_panel = 'rbac_panel_yes'
        # Trigger discovery, registration, and URLconf generation if it
        # hasn't happened yet.
        base.Horizon._urls()
        # Store our original dashboards
        self._discovered_dashboards = list(base.Horizon._registry)
        # Gather up and store our original panels for each dashboard
        self._discovered_panels = {}
        for dash in self._discovered_dashboards:
            panels = list(base.Horizon._registry[dash]._registry)
            self._discovered_panels[dash] = panels

    def tearDown(self):
        super(RbacHorizonTests, self).tearDown()
        # Restore our settings
        settings.HORIZON_CONFIG['default_dashboard'] = self.old_default_dash
        settings.HORIZON_CONFIG['dashboards'] = self.old_dashboards
        # Destroy our singleton and re-create it.
        base.HorizonSite._instance = None
        del base.Horizon
        base.Horizon = base.HorizonSite()
        # Reload the convenience references to Horizon stored in __init__
        moves.reload_module(import_module("horizon"))

        # Reset Cats and Dogs default_panel to default values
        Cats.default_panel = 'kittens'
        Dogs.default_panel = 'puppies'

        # Re-register our original dashboards and panels.
        # This is necessary because autodiscovery only works on the first
        # import, and calling reload introduces innumerable additional
        # problems. Manual re-registration is the only good way for testing.
        self._discovered_dashboards.remove(Cats)
        self._discovered_dashboards.remove(Dogs)
        for dash in self._discovered_dashboards:
            base.Horizon.register(dash)
            for panel in self._discovered_panels[dash]:
                dash.register(panel)

    def test_rbac_panels(self):
        context = {'request': self.request}
        cats = horizon.get_dashboard("cats")
        self.assertEqual(cats._registered_with, base.Horizon)
        self.assertQuerysetEqual(cats.get_panels(),
                                 ['<Panel: rbac_panel_no>'])
        self.assertFalse(cats.can_access(context))

        dogs = horizon.get_dashboard("dogs")
        self.assertEqual(dogs._registered_with, base.Horizon)
        self.assertQuerysetEqual(dogs.get_panels(),
                                 ['<Panel: rbac_panel_yes>'])

        self.assertTrue(dogs.can_access(context))
