def edit(request, redirect_id):
    theredirect = get_object_or_404(models.Redirect, id=redirect_id)

    if not permission_policy.user_has_permission_for_instance(
        request.user, 'change', theredirect
    ):
        return permission_denied(request)

    if request.method == 'POST':
        form = RedirectForm(request.POST, request.FILES, instance=theredirect)
        if form.is_valid():
            form.save()
            messages.success(request, _("Redirect '{0}' updated.").format(theredirect.title), buttons=[
                messages.button(reverse('wagtailredirects:edit', args=(theredirect.id,)), _('Edit'))
            ])
            return redirect('wagtailredirects:index')
        else:
            messages.error(request, _("The redirect could not be saved due to errors."))
    else:
        form = RedirectForm(instance=theredirect)

    return render(request, "wagtailredirects/edit.html", {
        'redirect': theredirect,
        'form': form,
        'user_can_delete': permission_policy.user_has_permission(request.user, 'delete'),
    })

def delete(request, content_type_app_name, content_type_model_name, id):
    content_type = get_content_type_from_url_params(content_type_app_name, content_type_model_name)
    if not user_can_edit_snippet_type(request.user, content_type):
        raise PermissionDenied

    model = content_type.model_class()
    snippet_type_name = get_snippet_type_name(content_type)[0]

    instance = get_object_or_404(model, id=id)

    if request.POST:
        instance.delete()
        messages.success(
            request,
            _("{snippet_type} '{instance}' deleted.").format(
                snippet_type=capfirst(snippet_type_name),
                instance=instance
            )
        )
        return redirect('wagtailsnippets_list', content_type.app_label, content_type.model)

    return render(request, 'wagtailsnippets/snippets/confirm_delete.html', {
        'content_type': content_type,
        'snippet_type_name': snippet_type_name,
        'instance': instance,
    })

def add(request):
    EmbedVideoModel = get_embed_video_model()
    EmbedVideoForm = get_embed_video_form(EmbedVideoModel)

    if request.method == 'POST':
        embed_video = EmbedVideoModel(uploaded_by_user=request.user)
        form = EmbedVideoForm(request.POST, request.FILES, instance=embed_video, user=request.user)
        if form.is_valid():
            form.save()

            # Reindex the embed video to make sure all tags are indexed
            search_index.insert_or_update_object(embed_video)

            messages.success(
                request,
                _("Video '{0}' added.").format(embed_video.title),
                buttons=[
                    messages.button(
                        reverse(
                            'wagtail_embed_videos:edit',
                            args=(embed_video.id,)
                        ),
                        _('Edit')
                    )
                ]
            )
            return redirect('wagtail_embed_videos:index')
        else:
            messages.error(request, _("The video could not be created due to errors."))
    else:
        form = EmbedVideoForm(user=request.user)

    return render(request, "wagtail_embed_videos/embed_videos/add.html", {
        'form': form,
    })

def delete_submissions(request, page_id):
    if not get_forms_for_user(request.user).filter(id=page_id).exists():
        raise PermissionDenied

    page = get_object_or_404(Page, id=page_id).specific

    # Get submissions
    submission_ids = request.GET.getlist('selected-submissions')
    submissions = page.get_submission_class()._default_manager.filter(id__in=submission_ids)

    if request.method == 'POST':
        count = submissions.count()
        submissions.delete()

        messages.success(
            request,
            ungettext(
                "One submission has been deleted.",
                "%(count)d submissions have been deleted.",
                count
            ) % {
                'count': count,
            }
        )

        return redirect('wagtailforms:list_submissions', page_id)

    return render(request, 'wagtailforms/confirm_delete.html', {
        'page': page,
        'submissions': submissions,
    })

def add(request):
    Document = get_document_model()
    DocumentForm = get_document_form(Document)

    if request.POST:
        doc = Document(uploaded_by_user=request.user)
        form = DocumentForm(request.POST, request.FILES, instance=doc, user=request.user)
        if form.is_valid():
            form.save()

            # Reindex the document to make sure all tags are indexed
            for backend in get_search_backends():
                backend.add(doc)

            messages.success(request, _("Document '{0}' added.").format(doc.title), buttons=[
                messages.button(reverse('wagtaildocs:edit', args=(doc.id,)), _('Edit'))
            ])
            return redirect('wagtaildocs:index')
        else:
            messages.error(request, _("The document could not be saved due to errors."))
    else:
        form = DocumentForm(user=request.user)

    return render(request, "wagtaildocs/documents/add.html", {
        'form': form,
    })

def add(request):
    if request.POST:
        # Get query
        query_form = search_forms.QueryForm(request.POST)
        if query_form.is_valid():
            query = Query.get(query_form['query_string'].value())

            # Save search picks
            searchpicks_formset = forms.SearchPromotionsFormSet(request.POST, instance=query)
            if save_searchpicks(query, query, searchpicks_formset):
                messages.success(request, _("Editor's picks for '{0}' created.").format(query), buttons=[
                    messages.button(reverse('wagtailsearchpromotions:edit', args=(query.id,)), _('Edit'))
                ])
                return redirect('wagtailsearchpromotions:index')
            else:
                if len(searchpicks_formset.non_form_errors()):
                    # formset level error (e.g. no forms submitted)
                    messages.error(request, " ".join(error for error in searchpicks_formset.non_form_errors()))
                else:
                    # specific errors will be displayed within form fields
                    messages.error(request, _("Recommendations have not been created due to errors"))
        else:
            searchpicks_formset = forms.SearchPromotionsFormSet()
    else:
        query_form = search_forms.QueryForm()
        searchpicks_formset = forms.SearchPromotionsFormSet()

    return render(request, 'wagtailsearchpromotions/add.html', {
        'query_form': query_form,
        'searchpicks_formset': searchpicks_formset,
    })

    def post(self, request, *args, **kwargs):
        try:
            msg = _("{model} '{instance}' deleted.").format(
                model=self.verbose_name, instance=self.instance)
            self.delete_instance()
            messages.success(request, msg)
            return redirect(self.index_url)
        except models.ProtectedError:
            linked_objects = []
            fields = self.model._meta.fields_map.values()
            fields = (obj for obj in fields if not isinstance(
                obj.field, ManyToManyField))
            for rel in fields:
                if rel.on_delete == models.PROTECT:
                    qs = getattr(self.instance, rel.get_accessor_name())
                    for obj in qs.all():
                        linked_objects.append(obj)

            context = {
                'view': self,
                'instance': self.instance,
                'protected_error': True,
                'linked_objects': linked_objects,
            }
            return self.render_to_response(context)

    def post(self, request, *args, **kwargs):
        if request.POST:
            try:
                self.delete_instance()
                messages.success(
                    request,
                    _("{model} '{instance}' deleted.").format(
                        model=self.model_name, instance=self.instance))
                return redirect(self.get_index_url)
            except models.ProtectedError:
                messages.error(
                    request, _(
                        "{model} '{instance}' could not be deleted."
                    ).format(model=self.model_name, instance=self.instance))

                linked_objects = []
                for rel in self.model._meta.get_all_related_objects():
                    if rel.on_delete == models.PROTECT:
                        qs = getattr(self.instance, rel.get_accessor_name())
                        for obj in qs.all():
                            linked_objects.append(obj)

                context = {
                    'view': self,
                    'instance': self.instance,
                    'error_protected': True,
                    'linked_objects': linked_objects,
                }
        return self.render_to_response(context)

def index(request):

    form = SearchForm(placeholder=_("Search something"))

    example_form = ExampleForm()

    messages.success(request, _("Success message"), buttons=[
        messages.button('', _('View live')),
        messages.button('', _('Edit'))
    ])
    messages.warning(request, _("Warning message"), buttons=[
        messages.button('', _('View live')),
        messages.button('', _('Edit'))
    ])
    messages.error(request, _("Error message"), buttons=[
        messages.button('', _('View live')),
        messages.button('', _('Edit'))
    ])

    fake_pagination = {
        'number': 1,
        'previous_page_number': 1,
        'next_page_number': 2,
        'has_previous': True,
        'has_next': True,
        'paginator': {
            'num_pages': 10,
        },
    }

    return render(request, 'wagtailstyleguide/base.html', {
        'search_form': form,
        'example_form': example_form,
        'fake_pagination': fake_pagination,
    })

def index(request):

    form = SearchForm(placeholder=_("Search something"))

    example_form = ExampleForm()

    messages.success(
        request, _("Success message"), buttons=[messages.button("", _("View live")), messages.button("", _("Edit"))]
    )
    messages.warning(
        request, _("Warning message"), buttons=[messages.button("", _("View live")), messages.button("", _("Edit"))]
    )
    messages.error(
        request, _("Error message"), buttons=[messages.button("", _("View live")), messages.button("", _("Edit"))]
    )

    fake_pagination = {
        "number": 1,
        "previous_page_number": 1,
        "next_page_number": 2,
        "has_previous": True,
        "has_next": True,
        "paginator": {"num_pages": 10},
    }

    return render(
        request,
        "wagtailstyleguide/base.html",
        {"search_form": form, "example_form": example_form, "fake_pagination": fake_pagination},
    )

    def form_valid(self, form):
        """
        Processes a valid form submittal.

        :param form: the form instance.
        :rtype: django.http.HttpResponse.
        """
        #noinspection PyAttributeOutsideInit
        self.object = form.save()
        meta        = getattr(self.object, '_meta')

        # Index the object.
        for backend in get_search_backends():
            backend.add(object)

        #noinspection PyUnresolvedReferences
        messages.success(
            self.request,
            _(u'{0} "{1}" saved.').format(
                meta.verbose_name,
                str(self.object)
            ),
            buttons=[messages.button(
                reverse(
                    '{0}:edit'.format(self.url_namespace),
                    args=(self.object.id,)
                ),
                _(u'Edit')
            )]
        )

        return redirect(self.get_success_url())

def create(request):
    GroupPagePermissionFormSet = inlineformset_factory(
        Group,
        GroupPagePermission,
        formset=BaseGroupPagePermissionFormSet,
        extra=0
    )
    if request.POST:
        form = GroupForm(request.POST)
        formset = GroupPagePermissionFormSet(request.POST)
        if form.is_valid() and formset.is_valid():
            group = form.save()
            formset.instance = group
            formset.save()
            messages.success(request, _("Group '{0}' created.").format(group), buttons = [
                messages.button(reverse('wagtailusers_groups_edit', args=(group.id,)), _('Edit'))
            ])
            return redirect('wagtailusers_groups_index')
        else:
            messages.error(request, _("The group could not be created due to errors."))
    else:
        form = GroupForm()
        formset = GroupPagePermissionFormSet()

    return render(request, 'wagtailusers/groups/create.html', {
        'form': form,
        'formset': formset,
    })

def edit(request, group_id):
    group = get_object_or_404(Group, id=group_id)
    GroupPagePermissionFormSet = inlineformset_factory(
        Group,
        GroupPagePermission,
        formset=BaseGroupPagePermissionFormSet,
        extra=0
    )
    if request.POST:
        form = GroupForm(request.POST, instance=group)
        formset = GroupPagePermissionFormSet(request.POST, instance=group)
        if form.is_valid() and formset.is_valid():
            group = form.save()
            formset.save()
            messages.success(request, _("Group '{0}' updated.").format(group), buttons = [
                messages.button(reverse('wagtailusers_groups_edit', args=(group.id,)), _('Edit'))
            ])
            return redirect('wagtailusers_groups_index')
        else:
            messages.error(request, _("The group could not be saved due to errors."))
    else:
        form = GroupForm(instance=group)
        formset = GroupPagePermissionFormSet(instance=group)

    return render(request, 'wagtailusers/groups/edit.html', {
        'group': group,
        'form': form,
        'formset': formset,
    })

def edit(request, image_id):
    Image = get_image_model()
    ImageForm = get_image_form(Image)

    image = get_object_or_404(Image, id=image_id)

    if not image.is_editable_by_user(request.user):
        raise PermissionDenied

    if request.POST:
        original_file = image.file
        form = ImageForm(request.POST, request.FILES, instance=image)
        if form.is_valid():
            if 'file' in form.changed_data:
                # if providing a new image file, delete the old one and all renditions.
                # NB Doing this via original_file.delete() clears the file field,
                # which definitely isn't what we want...
                original_file.storage.delete(original_file.name)
                image.renditions.all().delete()

                # Set new image file size
                image.file_size = image.file.size

            form.save()

            # Reindex the image to make sure all tags are indexed
            for backend in get_search_backends():
                backend.add(image)

            messages.success(request, _("Image '{0}' updated.").format(image.title), buttons=[
                messages.button(reverse('wagtailimages:edit', args=(image.id,)), _('Edit again'))
            ])
            return redirect('wagtailimages:index')
        else:
            messages.error(request, _("The image could not be saved due to errors."))
    else:
        form = ImageForm(instance=image)

    # Check if we should enable the frontend url generator
    try:
        reverse('wagtailimages_serve', args=('foo', '1', 'bar'))
        url_generator_enabled = True
    except NoReverseMatch:
        url_generator_enabled = False

    if image.is_stored_locally():
        # Give error if image file doesn't exist
        if not os.path.isfile(image.file.path):
            messages.error(request, _(
                "The source image file could not be found. Please change the source or delete the image."
            ).format(image.title), buttons=[
                messages.button(reverse('wagtailimages:delete', args=(image.id,)), _('Delete'))
            ])

    return render(request, "wagtailimages/images/edit.html", {
        'image': image,
        'form': form,
        'url_generator_enabled': url_generator_enabled,
        'filesize': image.get_file_size(),
    })

def add(request):
    theredirect = models.Redirect()

    form_class = REDIRECT_EDIT_HANDLER.get_form_class(models.Redirect)
    if request.POST:
        form = form_class(request.POST, request.FILES)
        if form.is_valid():
            theredirect = form.save(commit=False)
            theredirect.site = request.site
            theredirect.save()

            messages.success(request, _("Redirect '{0}' added.").format(theredirect.title), buttons=[
                messages.button(reverse('wagtailredirects_edit_redirect', args=(theredirect.id,)), _('Edit'))
            ])
            return redirect('wagtailredirects_index')
        else:
            messages.error(request, _("The redirect could not be created due to errors."))
            edit_handler = REDIRECT_EDIT_HANDLER(instance=theredirect, form=form)
    else:
        form = form_class()
        edit_handler = REDIRECT_EDIT_HANDLER(instance=theredirect, form=form)

    return render(request, "wagtailredirects/add.html", {
        'edit_handler': edit_handler,
    })

def edit(request, group_id):
    group = get_object_or_404(Group, id=group_id)
    if request.method == 'POST':
        form = GroupForm(request.POST, instance=group)
        permission_panels = [
            cls(request.POST, instance=group)
            for cls in get_permission_panel_classes()
        ]
        if form.is_valid() and all(panel.is_valid() for panel in permission_panels):
            form.save()

            for panel in permission_panels:
                panel.save()

            messages.success(request, _("Group '{0}' updated.").format(group), buttons=[
                messages.button(reverse('wagtailusers_groups:edit', args=(group.id,)), _('Edit'))
            ])
            return redirect('wagtailusers_groups:index')
        else:
            messages.error(request, _("The group could not be saved due to errors."))
    else:
        form = GroupForm(instance=group)
        permission_panels = [
            cls(instance=group)
            for cls in get_permission_panel_classes()
        ]

    return render(request, 'wagtailusers/groups/edit.html', {
        'group': group,
        'form': form,
        'permission_panels': permission_panels,
    })

def edit(request, query_id):
    query = get_object_or_404(Query, id=query_id)

    if request.POST:
        # Get query
        query_form = search_forms.QueryForm(request.POST)
        # and the recommendations
        searchpicks_formset = forms.SearchPromotionsFormSet(request.POST, instance=query)

        if query_form.is_valid():
            new_query = Query.get(query_form['query_string'].value())

            # Save search picks
            if save_searchpicks(query, new_query, searchpicks_formset):
                messages.success(request, _("Editor's picks for '{0}' updated.").format(new_query), buttons=[
                    messages.button(reverse('wagtailsearchpromotions:edit', args=(query.id,)), _('Edit'))
                ])
                return redirect('wagtailsearchpromotions:index')
            else:
                if len(searchpicks_formset.non_form_errors()):
                    messages.error(request, " ".join(error for error in searchpicks_formset.non_form_errors()))
                    # formset level error (e.g. no forms submitted)
                else:
                    messages.error(request, _("Recommendations have not been saved due to errors"))
                    # specific errors will be displayed within form fields

    else:
        query_form = search_forms.QueryForm(initial=dict(query_string=query.query_string))
        searchpicks_formset = forms.SearchPromotionsFormSet(instance=query)

    return render(request, 'wagtailsearchpromotions/edit.html', {
        'query_form': query_form,
        'searchpicks_formset': searchpicks_formset,
        'query': query,
    })

def delete(request, page_id):
    page = get_object_or_404(Page, id=page_id)
    if not page.permissions_for_user(request.user).can_delete():
        raise PermissionDenied

    for fn in hooks.get_hooks("before_delete_page"):
        result = fn(request, page)
        if hasattr(result, "status_code"):
            return result

    next_url = get_valid_next_url_from_request(request)

    if request.method == "POST":
        parent_id = page.get_parent().id
        page.delete()

        messages.success(request, _("Page '{0}' deleted.").format(page.get_admin_display_title()))

        for fn in hooks.get_hooks("after_delete_page"):
            result = fn(request, page)
            if hasattr(result, "status_code"):
                return result

        if next_url:
            return redirect(next_url)
        return redirect("wagtailadmin_explore", parent_id)

    return render(
        request,
        "wagtailadmin/pages/confirm_delete.html",
        {"page": page, "descendant_count": page.get_descendant_count(), "next": next_url},
    )

 def form_valid(self, form):
     instance = form.save()
     messages.success(
         self.request, self.get_success_message(instance),
         buttons=self.get_success_message_buttons(instance)
     )
     return redirect(self.get_success_url())

def unpublish(request, page_id):
    page = get_object_or_404(Page, id=page_id).specific

    user_perms = UserPagePermissionsProxy(request.user)
    if not user_perms.for_page(page).can_unpublish():
        raise PermissionDenied

    next_url = get_valid_next_url_from_request(request)

    if request.method == "POST":
        include_descendants = request.POST.get("include_descendants", False)

        page.unpublish()

        if include_descendants:
            live_descendant_pages = page.get_descendants().live().specific()
            for live_descendant_page in live_descendant_pages:
                if user_perms.for_page(live_descendant_page).can_unpublish():
                    live_descendant_page.unpublish()

        messages.success(
            request,
            _("Page '{0}' unpublished.").format(page.get_admin_display_title()),
            buttons=[messages.button(reverse("wagtailadmin_pages:edit", args=(page.id,)), _("Edit"))],
        )

        if next_url:
            return redirect(next_url)
        return redirect("wagtailadmin_explore", page.get_parent().id)

    return render(
        request,
        "wagtailadmin/pages/confirm_unpublish.html",
        {"page": page, "next": next_url, "live_descendant_count": page.get_descendants().live().count()},
    )