import json

from django.contrib.admin.helpers import ACTION_CHECKBOX_NAME
from django.contrib.admin.views.main import IS_POPUP_VAR
from django.contrib.auth.models import Permission, User
from django.core import mail
from django.template.loader import render_to_string
from django.template.response import TemplateResponse
from django.test import TestCase, override_settings
from django.urls import reverse

from .admin import SubscriberAdmin
from .forms import MediaActionForm
from .models import (
    Actor, Answer, ExternalSubscriber, Question, Subscriber, UnchangeableObject,
)


@override_settings(ROOT_URLCONF='admin_views.urls')
class AdminActionsTest(TestCase):

    @classmethod
    def setUpTestData(cls):
        cls.superuser = User.objects.create_superuser(username='super', password='secret', email='super@example.com')
        cls.s1 = ExternalSubscriber.objects.create(name='John Doe', email='john@example.org')
        cls.s2 = Subscriber.objects.create(name='Max Mustermann', email='max@example.org')

    def setUp(self):
        self.client.force_login(self.superuser)

    def test_model_admin_custom_action(self):
        """A custom action defined in a ModelAdmin method."""
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'mail_admin',
            'index': 0,
        }
        self.client.post(reverse('admin:admin_views_subscriber_changelist'), action_data)
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual(mail.outbox[0].subject, 'Greetings from a ModelAdmin action')

    def test_model_admin_default_delete_action(self):
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk, self.s2.pk],
            'action': 'delete_selected',
            'index': 0,
        }
        delete_confirmation_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk, self.s2.pk],
            'action': 'delete_selected',
            'post': 'yes',
        }
        confirmation = self.client.post(reverse('admin:admin_views_subscriber_changelist'), action_data)
        self.assertIsInstance(confirmation, TemplateResponse)
        self.assertContains(confirmation, 'Are you sure you want to delete the selected subscribers?')
        self.assertContains(confirmation, '<h2>Summary</h2>')
        self.assertContains(confirmation, '<li>Subscribers: 2</li>')
        self.assertContains(confirmation, '<li>External subscribers: 1</li>')
        self.assertContains(confirmation, ACTION_CHECKBOX_NAME, count=2)
        self.client.post(reverse('admin:admin_views_subscriber_changelist'), delete_confirmation_data)
        self.assertEqual(Subscriber.objects.count(), 0)

    @override_settings(USE_THOUSAND_SEPARATOR=True, USE_L10N=True)
    def test_non_localized_pk(self):
        """
        If USE_THOUSAND_SEPARATOR is set, the ids for the objects selected for
        deletion are rendered without separators.
        """
        s = ExternalSubscriber.objects.create(id=9999)
        action_data = {
            ACTION_CHECKBOX_NAME: [s.pk, self.s2.pk],
            'action': 'delete_selected',
            'index': 0,
        }
        response = self.client.post(reverse('admin:admin_views_subscriber_changelist'), action_data)
        self.assertTemplateUsed(response, 'admin/delete_selected_confirmation.html')
        self.assertContains(response, 'value="9999"')  # Instead of 9,999
        self.assertContains(response, 'value="%s"' % self.s2.pk)

    def test_model_admin_default_delete_action_protected(self):
        """
        The default delete action where some related objects are protected
        from deletion.
        """
        q1 = Question.objects.create(question='Why?')
        a1 = Answer.objects.create(question=q1, answer='Because.')
        a2 = Answer.objects.create(question=q1, answer='Yes.')
        q2 = Question.objects.create(question='Wherefore?')
        action_data = {
            ACTION_CHECKBOX_NAME: [q1.pk, q2.pk],
            'action': 'delete_selected',
            'index': 0,
        }
        delete_confirmation_data = action_data.copy()
        delete_confirmation_data['post'] = 'yes'
        response = self.client.post(reverse('admin:admin_views_question_changelist'), action_data)
        self.assertContains(response, 'would require deleting the following protected related objects')
        self.assertContains(
            response,
            '<li>Answer: <a href="%s">Because.</a></li>' % reverse('admin:admin_views_answer_change', args=(a1.pk,)),
            html=True
        )
        self.assertContains(
            response,
            '<li>Answer: <a href="%s">Yes.</a></li>' % reverse('admin:admin_views_answer_change', args=(a2.pk,)),
            html=True
        )
        # A POST request to delete protected objects displays the page which
        # says the deletion is prohibited.
        response = self.client.post(reverse('admin:admin_views_question_changelist'), delete_confirmation_data)
        self.assertContains(response, 'would require deleting the following protected related objects')
        self.assertEqual(Question.objects.count(), 2)

    def test_model_admin_default_delete_action_no_change_url(self):
        """
        The default delete action doesn't break if a ModelAdmin removes the
        change_view URL (#20640).
        """
        obj = UnchangeableObject.objects.create()
        action_data = {
            ACTION_CHECKBOX_NAME: obj.pk,
            'action': 'delete_selected',
            'index': '0',
        }
        response = self.client.post(reverse('admin:admin_views_unchangeableobject_changelist'), action_data)
        # No 500 caused by NoReverseMatch
        self.assertEqual(response.status_code, 200)
        # The page doesn't display a link to the nonexistent change page.
        self.assertContains(response, '<li>Unchangeable object: %s</li>' % obj, 1, html=True)

    def test_delete_queryset_hook(self):
        delete_confirmation_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk, self.s2.pk],
            'action': 'delete_selected',
            'post': 'yes',
            'index': 0,
        }
        SubscriberAdmin.overridden = False
        self.client.post(reverse('admin:admin_views_subscriber_changelist'), delete_confirmation_data)
        # SubscriberAdmin.delete_queryset() sets overridden to True.
        self.assertIs(SubscriberAdmin.overridden, True)
        self.assertEqual(Subscriber.objects.all().count(), 0)

    def test_custom_function_mail_action(self):
        """A custom action may be defined in a function."""
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'external_mail',
            'index': 0,
        }
        self.client.post(reverse('admin:admin_views_externalsubscriber_changelist'), action_data)
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual(mail.outbox[0].subject, 'Greetings from a function action')

    def test_custom_function_action_with_redirect(self):
        """Another custom action defined in a function."""
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'redirect_to',
            'index': 0,
        }
        response = self.client.post(reverse('admin:admin_views_externalsubscriber_changelist'), action_data)
        self.assertEqual(response.status_code, 302)

    def test_default_redirect(self):
        """
        Actions which don't return an HttpResponse are redirected to the same
        page, retaining the querystring (which may contain changelist info).
        """
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'external_mail',
            'index': 0,
        }
        url = reverse('admin:admin_views_externalsubscriber_changelist') + '?o=1'
        response = self.client.post(url, action_data)
        self.assertRedirects(response, url)

    def test_custom_function_action_streaming_response(self):
        """A custom action may return a StreamingHttpResponse."""
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'download',
            'index': 0,
        }
        response = self.client.post(reverse('admin:admin_views_externalsubscriber_changelist'), action_data)
        content = b''.join(response.streaming_content)
        self.assertEqual(content, b'This is the content of the file')
        self.assertEqual(response.status_code, 200)

    def test_custom_function_action_no_perm_response(self):
        """A custom action may returns an HttpResponse with a 403 code."""
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'no_perm',
            'index': 0,
        }
        response = self.client.post(reverse('admin:admin_views_externalsubscriber_changelist'), action_data)
        self.assertEqual(response.status_code, 403)
        self.assertEqual(response.content, b'No permission to perform this action')

    def test_actions_ordering(self):
        """Actions are ordered as expected."""
        response = self.client.get(reverse('admin:admin_views_externalsubscriber_changelist'))
        self.assertContains(response, '''<label>Action: <select name="action" required>
<option value="" selected>---------</option>
<option value="delete_selected">Delete selected external
subscribers</option>
<option value="redirect_to">Redirect to (Awesome action)</option>
<option value="external_mail">External mail (Another awesome
action)</option>
<option value="download">Download subscription</option>
<option value="no_perm">No permission to run</option>
</select>''', html=True)

    def test_model_without_action(self):
        """A ModelAdmin might not have any actions."""
        response = self.client.get(reverse('admin:admin_views_oldsubscriber_changelist'))
        self.assertIsNone(response.context['action_form'])
        self.assertNotContains(
            response, '<input type="checkbox" class="action-select"',
            msg_prefix='Found an unexpected action toggle checkboxbox in response'
        )
        self.assertNotContains(response, '<input type="checkbox" class="action-select"')

    def test_model_without_action_still_has_jquery(self):
        """
        A ModelAdmin without any actions still has jQuery included on the page.
        """
        response = self.client.get(reverse('admin:admin_views_oldsubscriber_changelist'))
        self.assertIsNone(response.context['action_form'])
        self.assertContains(
            response, 'jquery.min.js',
            msg_prefix='jQuery missing from admin pages for model with no admin actions'
        )

    def test_action_column_class(self):
        """The checkbox column class is present in the response."""
        response = self.client.get(reverse('admin:admin_views_subscriber_changelist'))
        self.assertIsNotNone(response.context['action_form'])
        self.assertContains(response, 'action-checkbox-column')

    def test_multiple_actions_form(self):
        """
        Actions come from the form whose submit button was pressed (#10618).
        """
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            # Two different actions selected on the two forms...
            'action': ['external_mail', 'delete_selected'],
            # ...but "go" was clicked on the top form.
            'index': 0
        }
        self.client.post(reverse('admin:admin_views_externalsubscriber_changelist'), action_data)
        # The action sends mail rather than deletes.
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual(mail.outbox[0].subject, 'Greetings from a function action')

    def test_media_from_actions_form(self):
        """
        The action form's media is included in the changelist view's media.
        """
        response = self.client.get(reverse('admin:admin_views_subscriber_changelist'))
        media_path = MediaActionForm.Media.js[0]
        self.assertIsInstance(response.context['action_form'], MediaActionForm)
        self.assertIn('media', response.context)
        self.assertIn(media_path, response.context['media']._js)
        self.assertContains(response, media_path)

    def test_user_message_on_none_selected(self):
        """
        User sees a warning when 'Go' is pressed and no items are selected.
        """
        action_data = {
            ACTION_CHECKBOX_NAME: [],
            'action': 'delete_selected',
            'index': 0,
        }
        url = reverse('admin:admin_views_subscriber_changelist')
        response = self.client.post(url, action_data)
        self.assertRedirects(response, url, fetch_redirect_response=False)
        response = self.client.get(response.url)
        msg = 'Items must be selected in order to perform actions on them. No items have been changed.'
        self.assertContains(response, msg)
        self.assertEqual(Subscriber.objects.count(), 2)

    def test_user_message_on_no_action(self):
        """
        User sees a warning when 'Go' is pressed and no action is selected.
        """
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk, self.s2.pk],
            'action': '',
            'index': 0,
        }
        url = reverse('admin:admin_views_subscriber_changelist')
        response = self.client.post(url, action_data)
        self.assertRedirects(response, url, fetch_redirect_response=False)
        response = self.client.get(response.url)
        self.assertContains(response, 'No action selected.')
        self.assertEqual(Subscriber.objects.count(), 2)

    def test_selection_counter(self):
        """The selection counter is there."""
        response = self.client.get(reverse('admin:admin_views_subscriber_changelist'))
        self.assertContains(response, '0 of 2 selected')

    def test_popup_actions(self):
        """ Actions aren't shown in popups."""
        changelist_url = reverse('admin:admin_views_subscriber_changelist')
        response = self.client.get(changelist_url)
        self.assertIsNotNone(response.context['action_form'])
        response = self.client.get(changelist_url + '?%s' % IS_POPUP_VAR)
        self.assertIsNone(response.context['action_form'])

    def test_popup_template_response_on_add(self):
        """
        Success on popups shall be rendered from template in order to allow
        easy customization.
        """
        response = self.client.post(
            reverse('admin:admin_views_actor_add') + '?%s=1' % IS_POPUP_VAR,
            {'name': 'Troy McClure', 'age': '55', IS_POPUP_VAR: '1'}
        )
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.template_name, [
            'admin/admin_views/actor/popup_response.html',
            'admin/admin_views/popup_response.html',
            'admin/popup_response.html',
        ])
        self.assertTemplateUsed(response, 'admin/popup_response.html')

    def test_popup_template_response_on_change(self):
        instance = Actor.objects.create(name='David Tennant', age=45)
        response = self.client.post(
            reverse('admin:admin_views_actor_change', args=(instance.pk,)) + '?%s=1' % IS_POPUP_VAR,
            {'name': 'David Tennant', 'age': '46', IS_POPUP_VAR: '1'}
        )
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.template_name, [
            'admin/admin_views/actor/popup_response.html',
            'admin/admin_views/popup_response.html',
            'admin/popup_response.html',
        ])
        self.assertTemplateUsed(response, 'admin/popup_response.html')

    def test_popup_template_response_on_delete(self):
        instance = Actor.objects.create(name='David Tennant', age=45)
        response = self.client.post(
            reverse('admin:admin_views_actor_delete', args=(instance.pk,)) + '?%s=1' % IS_POPUP_VAR,
            {IS_POPUP_VAR: '1'}
        )
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.template_name, [
            'admin/admin_views/actor/popup_response.html',
            'admin/admin_views/popup_response.html',
            'admin/popup_response.html',
        ])
        self.assertTemplateUsed(response, 'admin/popup_response.html')

    def test_popup_template_escaping(self):
        popup_response_data = json.dumps({
            'new_value': 'new_value\\',
            'obj': 'obj\\',
            'value': 'value\\',
        })
        context = {
            'popup_response_data': popup_response_data,
        }
        output = render_to_string('admin/popup_response.html', context)
        self.assertIn(
            r'&quot;value\\&quot;', output
        )
        self.assertIn(
            r'&quot;new_value\\&quot;', output
        )
        self.assertIn(
            r'&quot;obj\\&quot;', output
        )


@override_settings(ROOT_URLCONF='admin_views.urls')
class AdminActionsPermissionTests(TestCase):

    @classmethod
    def setUpTestData(cls):
        cls.s1 = ExternalSubscriber.objects.create(name='John Doe', email='john@example.org')
        cls.s2 = Subscriber.objects.create(name='Max Mustermann', email='max@example.org')

    def setUp(self):
        self.user = User.objects.create_user(
            username='user', password='secret', email='user@example.com',
            is_staff=True,
        )
        self.client.force_login(self.user)
        permission = Permission.objects.get(codename='change_subscriber')
        self.user.user_permissions.add(permission)

    def test_model_admin_no_delete_permission(self):
        """
        Permission is denied if the user doesn't have delete permission for the
        model (Subscriber).
        """
        action_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk],
            'action': 'delete_selected',
        }
        response = self.client.post(reverse('admin:admin_views_subscriber_changelist'), action_data)
        self.assertEqual(response.status_code, 403)

    def test_model_admin_no_delete_permission_externalsubscriber(self):
        """
        Permission is denied if the user doesn't have delete permission for a
        related model (ExternalSubscriber).
        """
        permission = Permission.objects.get(codename='delete_subscriber')
        self.user.user_permissions.add(permission)
        delete_confirmation_data = {
            ACTION_CHECKBOX_NAME: [self.s1.pk, self.s2.pk],
            'action': 'delete_selected',
            'post': 'yes',
        }
        response = self.client.post(reverse('admin:admin_views_subscriber_changelist'), delete_confirmation_data)
        self.assertEqual(response.status_code, 403)