import mock
import datetime
from contextlib import contextmanager
import uuid

from django.test import TestCase
from django.utils.unittest import skipUnless
from django.test.client import RequestFactory
from django.test.utils import override_settings
from django import forms
from django.conf import settings
from django.core.exceptions import PermissionDenied
from django.utils import timezone
from django.core import urlresolvers
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType
from django.contrib import admin
from django.db.models.signals import post_save
from django.conf.urls import url, include

from mezzanine.core.models import (CONTENT_STATUS_PUBLISHED,
                                   CONTENT_STATUS_DRAFT)

from widgy.site import WidgySite
from widgy.utils import get_user_model
from widgy.contrib.widgy_mezzanine import get_widgypage_model
from widgy.contrib.widgy_mezzanine.views import ClonePageView, UnpublishView
from widgy.db.fields import get_site

from widgy.contrib.widgy_mezzanine.admin import WidgyPageAdmin

User = get_user_model()
widgy_site = WidgySite()
WidgyPage = get_widgypage_model()

urlpatterns = __import__(settings.ROOT_URLCONF).urlpatterns + [url('^widgy_site/', include(widgy_site.urls))]

FORM_BUILDER_INSTALLED = 'widgy.contrib.form_builder' in settings.INSTALLED_APPS

if FORM_BUILDER_INSTALLED:
    from widgy.contrib.form_builder.models import Form, FormInput
    from widgy.contrib.widgy_mezzanine.views import handle_form

PAGE_BUILDER_INSTALLED = 'widgy.contrib.page_builder' in settings.INSTALLED_APPS

if PAGE_BUILDER_INSTALLED:
    from widgy.contrib.page_builder.models import Button, DefaultLayout
    from widgy.contrib.widgy_mezzanine.views import PreviewView

REVIEW_QUEUE_INSTALLED = 'widgy.contrib.review_queue' in settings.INSTALLED_APPS

if REVIEW_QUEUE_INSTALLED:
    from widgy.contrib.review_queue.site import ReviewedWidgySite
    reviewed_widgy_site = ReviewedWidgySite()
    urlpatterns += [url('^reviewed_widgy_site/', include(reviewed_widgy_site.urls))]


def make_reviewed(fn):
    """
    Just setting the WIDGY_MEZZANINE_SITE is not enough during tests, because
    WidgyPage.root_node has been set to point to VersionTracker.  We have to
    manually point it to ReviewedVersionTracker.  We do this only in tests
    because on a normal run, you are never going to be changing what models a
    ForeignKey points to (I would hope).
    """
    from widgy.contrib.widgy_mezzanine.admin import publish_page_on_approve

    site = reviewed_widgy_site
    rel = WidgyPage._meta.get_field('root_node').rel
    old_to = rel.to
    dispatch_uid = str(uuid.uuid4())

    fn = override_settings(WIDGY_MEZZANINE_SITE=site)(fn)
    fn = skipUnless(REVIEW_QUEUE_INSTALLED, 'review_queue is not installed')(fn)

    def up():
        rel.to = site.get_version_tracker_model()
        post_save.connect(publish_page_on_approve,
                          sender=site.get_version_tracker_model().commit_model,
                          dispatch_uid=dispatch_uid)

    def down():
        rel.to = old_to
        post_save.disconnect(dispatch_uid=dispatch_uid)

    if isinstance(fn, type):
        old_pre_setup = fn._pre_setup
        old_post_teardown = fn._post_teardown

        def _pre_setup(self):
            up()
            old_pre_setup(self)

        def _post_teardown(self):
            old_post_teardown(self)
            down()

        fn._pre_setup = _pre_setup
        fn._post_teardown = _post_teardown

        return fn
    else:
        def change_foreign_key(*args, **kwargs):
            up()
            try:
                return fn(*args, **kwargs)
            finally:
                down()
        return change_foreign_key


@skipUnless(FORM_BUILDER_INSTALLED, 'form_builder not installed')
class TestFormHandler(TestCase):
    def setUp(self):
        self.factory = RequestFactory()
        self.form = Form.add_root(widgy_site)

    def test_get(self):
        req = self.factory.get('/?from=/foo/')
        resp = handle_form(req, form_node_pk=self.form.node.pk)

        self.assertEqual(resp['Location'], '/foo/')

    def test_post(self):
        req = self.factory.post('/?from=/foo/')

        with mock.patch.object(Form, 'execute') as form_execute:
            form_execute.return_value = object()
            resp = handle_form(req, form_node_pk=self.form.node.pk)

        args, kwargs = form_execute.call_args
        self.assertIs(args[0], req)
        self.assertIsInstance(args[1], forms.BaseForm)

        # should use the form's response
        self.assertIs(resp, form_execute.return_value)

    def test_post_rerender(self):
        self.form.children['fields'].add_child(widgy_site, FormInput,
                                               label='foo',
                                               required=True,
                                               type='text',
                                               )

        req = self.factory.post('/?from=/foo/')
        req.user = User(is_superuser=True)

        with mock.patch.object(Form, 'execute') as form_execute:
            with mock.patch('widgy.contrib.widgy_mezzanine.views.page_view') as page_view:
                page_view.return_value = object()
                resp = handle_form(req, form_node_pk=self.form.node.pk)

        form_execute.assert_not_called()

        self.assertIs(resp, page_view.return_value)

        args, kwargs = page_view.call_args
        self.assertIs(args[0], req)
        extra_context = kwargs['extra_context']

        self.assertEqual(extra_context['root_node_override'], self.form.node)

        django_form = extra_context[self.form.context_var]
        self.assertIsInstance(django_form, forms.BaseForm)
        self.assertTrue(django_form.errors)

    @override_settings(MIDDLEWARE_CLASSES=settings.MIDDLEWARE_CLASSES + (
        'mezzanine.pages.middleware.PageMiddleware',
    ))
    def test_post_no_404(self):
        """
        Mezzanine==3.1.2 introduced a change that caused calls to page view
        (such as in the form_invalid of the handle_form view to 404.  This test
        ensures that there is no 404.
        """
        from widgy.contrib.widgy_mezzanine.models import WidgyPage
        page = WidgyPage.objects.create(title='Test')

        self.form.children['fields'].add_child(widgy_site, FormInput,
                                               label='foo',
                                               required=True,
                                               type='text',
                                               )

        req = self.factory.post('/?from=/foo/')
        req.user = User(is_superuser=True)

        resp = handle_form(req, form_node_pk=self.form.node.pk, slug=page.slug)

        self.assertEqual(resp.status_code, 200)


class UserSetup(object):
    def setUp(self):
        super(UserSetup, self).setUp()
        self.superuser = User.objects.create_superuser('superuser', 'test@example.com', 'password')
        self.staffuser = User.objects.create_user('staffuser', 'test@example.com', 'password')
        self.staffuser.is_staff = True
        self.staffuser.save()
        self.staffuser.user_permissions = Permission.objects.filter(
            content_type__app_label__in=['pages', 'widgy_mezzanine', 'review_queue']
        ).exclude(codename='change_reviewedversioncommit')

    @contextmanager
    def as_user(self, username):
        self.client.login(username=username, password='password')
        yield
        self.client.logout()


@skipUnless(PAGE_BUILDER_INSTALLED, 'page_builder is not installed')
@override_settings(MIDDLEWARE_CLASSES=settings.MIDDLEWARE_CLASSES + (
    'mezzanine.pages.middleware.PageMiddleware',
))
class TestPreviewView(UserSetup, TestCase):
    def setUp(self):
        super(TestPreviewView, self).setUp()
        self.factory = RequestFactory()
        self.preview_view = PreviewView.as_view(site=widgy_site)
        self.request = self.factory.get('/')
        self.request.user = User(is_superuser=True)

    def test_preview(self):
        page = WidgyPage.objects.create(title='Test')
        root_node1 = Button.add_root(widgy_site, text='Test 1')
        root_node2 = Button.add_root(widgy_site, text='Test 2')

        resp1 = self.preview_view(self.request, node_pk=root_node1.node.pk, page_pk=page.pk)

        self.assertEqual(resp1.status_code, 200)
        self.assertIn('Test 1', resp1.rendered_content)
        self.assertEqual(resp1.context_data['page'].get_content_model(), page)

        resp2 = self.preview_view(self.request, node_pk=root_node2.node.pk, page_pk=page.pk)

        self.assertEqual(resp2.status_code, 200)
        self.assertIn('Test 2', resp2.rendered_content)

    def test_preview_without_page(self):
        button = Button.add_root(widgy_site, text='Button text')

        resp = self.preview_view(self.request, node_pk=button.node.pk)
        self.assertIn(button.text, resp.rendered_content)

    def test_legacy_url(self):
        page = WidgyPage.objects.create(title='Foo')
        root_node = Button.add_root(widgy_site, text='Foo').node
        with self.as_user('superuser'):
            r = self.client.get(urlresolvers.reverse(
                'widgy.contrib.widgy_mezzanine.views.preview',
                kwargs={'slug': page.slug, 'node_pk': root_node.pk}
            ))
            self.assertRedirects(
                response=r,
                expected_url= urlresolvers.reverse(
                    'widgy.contrib.widgy_mezzanine.views.preview',
                    kwargs={'page_pk': page.pk, 'node_pk': root_node.pk}
                ),
                status_code=301,
            )


@skipUnless(PAGE_BUILDER_INSTALLED, 'page_builder is not installed')
class PageSetup(object):
    def setUp(self):
        super(PageSetup, self).setUp()
        self.factory = RequestFactory()

        site = get_site(getattr(settings, 'WIDGY_MEZZANINE_SITE', widgy_site))

        self.page = WidgyPage.objects.create(
            root_node=site.get_version_tracker_model().objects.create(
                working_copy=Button.add_root(site, text='buttontext').node,
            ),
            title='titleabc',
            slug='slugabc',
        )


class AdminView(PageSetup):
    def as_view(self, **kwargs):
        kwargs.setdefault('has_permission', lambda req: True)
        kwargs.setdefault('model', WidgyPage)
        return self.view_cls.as_view(**kwargs)

    def test_permissions(self):
        with self.assertRaises(PermissionDenied):
            forbid_everything = lambda req: False
            req = self.factory.get('/')
            self.as_view(has_permission=forbid_everything)(req, str(self.page.pk))


class TestClonePage(AdminView, TestCase):
    view_cls = ClonePageView

    def test_get(self):
        view = self.as_view(model=WidgyPage)

        resp = view(self.factory.get('/'), str(self.page.pk))
        self.assertEqual(resp.status_code, 200)
        self.assertIn(self.page.title, resp.rendered_content)
        self.assertNotIn(self.page.slug, resp.rendered_content)

    def test_post(self):
        view = self.as_view(model=WidgyPage)
        with mock.patch('django.contrib.messages.success') as success_mock:
            req = self.factory.post('/', {'title': 'new title'})

            view(req, str(self.page.pk))

        new_page = WidgyPage.objects.exclude(pk=self.page.pk).get()

        success_mock.assert_called_with(req, mock.ANY)
        success_message = success_mock.call_args[0][1]
        self.assertIn(self.page.title, success_message)
        self.assertIn(new_page.title, success_message)

        self.assertNotEqual(new_page.slug, self.page.slug)
        self.assertEqual(new_page.title, 'new title')

        self.assertEqual(new_page.root_node.working_copy.content.text, 'buttontext')


class TestUnpublish(AdminView, TestCase):
    view_cls = UnpublishView

    def test_unpublish(self):
        self.assertEqual(self.page.status, CONTENT_STATUS_PUBLISHED)

        view = self.as_view(model=WidgyPage)
        resp = view(self.factory.get('/'), str(self.page.pk))
        self.assertEqual(resp.status_code, 200)
        self.assertIn(self.page.title, resp.rendered_content)

        with mock.patch('django.contrib.messages.success') as success_mock:
            req = self.factory.post('/')
            resp = view(req, str(self.page.pk))
        self.assertEqual(resp.status_code, 302)
        success_mock.assert_called_with(req, mock.ANY)

        self.page = WidgyPage.objects.get(pk=self.page.pk)
        self.assertEqual(self.page.status, CONTENT_STATUS_DRAFT)


class TestAdminButtonsBase(PageSetup, UserSetup):
    urls = 'widgy.contrib.widgy_mezzanine.tests'

    def setUp(self):
        super(TestAdminButtonsBase, self).setUp()
        self.model_admin = WidgyPageAdmin(WidgyPage, admin.site)

    def test_save_and_commit_without_changes(self):
        req = self.factory.post('/')
        req.user = self.superuser

        self.model_admin._save_and_commit(req, self.page)
        self.assertEqual(self.page.root_node.commits.count(), 1)
        # save and commit again should not commit again when there are no
        # changes to commit
        self.model_admin._save_and_commit(req, self.page)
        self.assertEqual(self.page.root_node.commits.count(), 1)


@skipUnless(PAGE_BUILDER_INSTALLED, 'page_builder is not installed')
@override_settings(WIDGY_MEZZANINE_SITE=widgy_site)
class TestAdminButtons(TestAdminButtonsBase, TestCase):
    def setUp(self):
        super(TestAdminButtons, self).setUp()
        self.client.login(username='superuser', password='password')

    def test_status_embryo(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_add')
        response = self.client.get(url)
        self.assertIn('Save', response.content)

    def test_status_embryo_save(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_add')
        response = self.client.get(url)
        data = {
            '_continue': '',
            'title': 'Title',
            'slug': 'test_status_embryo_save',
            'root_node': ContentType.objects.get_for_model(DefaultLayout).pk,
        }
        response = self.client.post(url, data)
        self.assertEqual(response.status_code, 302)
        page = WidgyPage.objects.get(slug='test_status_embryo_save')
        self.assertEqual(page.status, CONTENT_STATUS_DRAFT)

    def test_save_and_commit(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()
        req = self.factory.post('/')
        req.user = self.superuser
        self.model_admin._save_and_commit(req, self.page)
        self.assertEqual(self.page.status, CONTENT_STATUS_PUBLISHED)

    def test_save_and_commit_without_permission(self):
        self.model_admin = WidgyPageAdmin(WidgyPage, admin.site)
        req = self.factory.post('/')
        req.user = self.staffuser

        self.staffuser.user_permissions.filter(codename='add_versioncommit').delete()

        with mock.patch('django.contrib.messages.error') as error_mock:
            self.model_admin._save_and_commit(req, self.page)
        error_mock.assert_called_with(req, mock.ANY)
        self.assertEqual(self.page.root_node.commits.count(), 0)

    def test_status_draft(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        response = self.client.get(url)
        self.assertIn('Save as Draft', response.content)
        self.assertIn('Publish', response.content)

    def test_status_published(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        response = self.client.get(url)
        self.assertIn('Publish Changes', response.content)

    def test_delete_button(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_add')
        response = self.client.get(url)
        self.assertNotIn('Delete', response.content)
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        response = self.client.get(url)
        self.assertIn('Delete', response.content)


@make_reviewed
class TestAdminButtonsWhenReviewed(TestAdminButtonsBase, TestCase):
    def test_save_and_commit(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()
        req = self.factory.post('/')
        req.user = self.staffuser
        self.model_admin._save_and_commit(req, self.page)
        self.assertEqual(self.page.status, CONTENT_STATUS_DRAFT)
        self.assertEqual(self.page.root_node.commits.count(), 1)
        commit = self.page.root_node.commits.get()
        self.assertFalse(commit.reviewedversioncommit.is_approved)

    def test_save_and_approve(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()
        req = self.factory.post('/')
        req.user = self.superuser
        self.model_admin._save_and_approve(req, self.page)
        self.assertEqual(self.page.status, CONTENT_STATUS_PUBLISHED)
        self.assertEqual(self.page.root_node.commits.count(), 1)
        self.assertTrue(self.page.root_node.head.reviewedversioncommit.is_approved)

    def test_save_and_approve_without_permission(self):
        req = self.factory.post('/')
        req.user = self.staffuser
        with mock.patch('django.contrib.messages.error') as error_mock:
            self.model_admin._save_and_approve(req, self.page)
        error_mock.assert_called_with(req, mock.ANY)
        self.assertEqual(self.page.root_node.commits.count(), 0)

    def test_save_and_approve_without_commit(self):
        commit = self.page.root_node.commit()
        req = self.factory.post('/')
        req.user = self.superuser
        self.model_admin._save_and_approve(req, self.page)
        self.assertTrue(refetch(commit).reviewedversioncommit.is_approved)
        self.assertEqual(self.page.root_node.commits.count(), 1)

    def test_save_and_commit_without_changes(self):
        with mock.patch('django.contrib.messages.warning') as warning_mock:
            super(TestAdminButtonsWhenReviewed, self).test_save_and_commit_without_changes()
        warning_mock.assert_called_with(mock.ANY, mock.ANY)

    def test_status_embryo(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_add')
        # same for staff or superuser
        with self.as_user('staffuser'):
            response = self.client.get(url)
            self.assertIn('Save', response.content)

    def test_status_draft(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        with self.as_user('staffuser'):
            response = self.client.get(url)
            self.assertIn('Save as Draft', response.content)
            self.assertIn('Submit for Review', response.content)
            self.assertNotIn('_save_and_approve', response.content)
        with self.as_user('superuser'):
            response = self.client.get(url)
            self.assertIn('Save as Draft', response.content)
            self.assertIn('Submit for Review', response.content)
            self.assertIn('_save_and_approve', response.content)

    def test_status_published(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        with self.as_user('staffuser'):
            response = self.client.get(url)
            self.assertNotIn('Save as Draft', response.content)
            self.assertIn('Submit for Review', response.content)
            self.assertNotIn('_save_and_approve', response.content)
        with self.as_user('superuser'):
            response = self.client.get(url)
            self.assertNotIn('Save as Draft', response.content)
            self.assertIn('Submit for Review', response.content)


class TestAdminMessages(PageSetup, TestCase):
    urls = 'widgy.contrib.widgy_mezzanine.tests'

    def setUp(self):
        super(TestAdminMessages, self).setUp()
        self.user = User.objects.create_superuser('test', 'test@example.com', 'password')
        self.client.login(username='test', password='password')

    def test_future_schedule_message(self):
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        self.page.root_node.commit(publish_at=timezone.now() + datetime.timedelta(days=1))
        response = self.client.get(url)
        self.assertIn('one future-scheduled commit', response.content)
        # make the future commit uninteresting
        self.page.root_node.commit()
        response = self.client.get(url)
        self.assertNotIn('future-scheduled commit', response.content)

    @make_reviewed
    def test_unapproved_commit_message(self):
        self.page = refetch(self.page)
        url = urlresolvers.reverse('admin:widgy_mezzanine_widgypage_change', args=(self.page.pk,))
        self.page.root_node.commit()
        response = self.client.get(url)
        self.assertIn('one unreviewed commit', response.content)
        # make the unreviewed commit uninteresting
        new_commit = self.page.root_node.commit()
        new_commit.approve(user=self.user)
        response = self.client.get(url)
        self.assertNotIn('unreviewed commit', response.content)


def refetch(obj):
    return obj.__class__.objects.get(pk=obj.pk)


@make_reviewed
class TestPublicationCommitHandling(PageSetup, TestCase):
    def setUp(self):
        super(TestPublicationCommitHandling, self).setUp()
        self.user = User.objects.create_superuser(
            username='asfd', password='asdfasdf', email='asdf@example.com',
        )

        self.vt = self.page.root_node

    def test_publish_on_commit(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()

        commit = self.vt.commit()
        commit.publish_at = timezone.now() + datetime.timedelta(days=1)

        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_DRAFT)

        commit.approve(self.user)
        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_PUBLISHED)
        self.assertEqual(refetch(self.page).publish_date, refetch(commit).publish_at)

    def test_committing_again_does_nothing(self):
        self.page.status = CONTENT_STATUS_DRAFT
        self.page.save()

        commit = self.vt.commit()
        commit.approve(self.user)
        original_publish_date = refetch(self.page).publish_date

        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_PUBLISHED)
        self.vt.commit(publish_at=timezone.now() + datetime.timedelta(days=1))

        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_PUBLISHED)
        self.assertEqual(refetch(self.page).publish_date, original_publish_date)

    def test_publish_commit_moves_publish_date_up(self):
        self.page.publish_date = timezone.now() + datetime.timedelta(days=1)
        self.page.save()

        commit = self.vt.commit()
        commit.approve(self.user)
        self.assertEqual(refetch(self.page).publish_date, refetch(commit).publish_at)

    def test_unapprove_commit_unpublishes_page_when_there_are_no_other_published_commits(self):
        commit = self.vt.commit()
        commit.approve(self.user)
        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_PUBLISHED)

        commit.unapprove(self.user)

        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_DRAFT)

    def test_unapprove_commit_corrects_publish_date_there_is_another_commit(self):
        c1 = self.vt.commit()
        c1.approve(self.user)

        c2 = self.vt.commit(publish_at=timezone.now() + datetime.timedelta(days=1))
        c2.approve(self.user)
        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_PUBLISHED)

        c1.unapprove(self.user)

        self.assertEqual(refetch(self.page).status, CONTENT_STATUS_PUBLISHED)
        self.assertEqual(refetch(self.page).publish_date, refetch(c2).publish_at)
