Add announcements (#12662)

* Add announcements

Fix #11006

* Add reactions to announcements

* Add admin UI for announcements

* Add unit tests

* Fix issues

- Add `with_dismissed` param to announcements API
- Fix end date not being formatted when time range is given
- Fix announcement delete causing reactions to send streaming updates
- Fix announcements container growing too wide and mascot too small
- Fix `all_day` being settable when no time range is given
- Change text "Update" to "Announcement"

* Fix scheduler unpublishing announcements before they are due

* Fix filter params not being passed to announcements filter

app/views/admin/announcements/_announcement.html.haml

@@ -0,0 +1,14 @@
+%tr
+  %td
+    = truncate(announcement.text)
+  %td
+    = time_range(announcement) if announcement.time_range?
+  %td
+    - if announcement.scheduled_at.present?
+      = fa_icon('clock-o') if announcement.scheduled_at > Time.now.utc
+      = l(announcement.scheduled_at)
+    - else
+      = l(announcement.created_at)
+  %td
+    = table_link_to 'pencil', t('generic.edit'), edit_admin_announcement_path(announcement) if can?(:update, announcement)
+    = table_link_to 'trash', t('generic.delete'), admin_announcement_path(announcement), method: :delete, data: { confirm: t('admin.accounts.are_you_sure') } if can?(:destroy, announcement)

app/views/admin/announcements/edit.html.haml

@@ -0,0 +1,22 @@
+- content_for :page_title do
+  = t('.title')
+
+= simple_form_for @announcement, url: admin_announcement_path(@announcement) do |f|
+  = render 'shared/error_messages', object: @announcement
+
+  .fields-group
+    = f.input :starts_at, include_blank: true, wrapper: :with_block_label
+    = f.input :ends_at, include_blank: true, wrapper: :with_block_label
+
+  .fields-group
+    = f.input :all_day, as: :boolean, wrapper: :with_label
+
+  .fields-group
+    = f.input :text, wrapper: :with_block_label
+
+  - if @announcement.scheduled_at.present? && !@announcement.published?
+    .fields-group
+      = f.input :scheduled_at, include_blank: true, wrapper: :with_block_label
+
+  .actions
+    = f.button :button, t('generic.save_changes'), type: :submit

app/views/admin/announcements/index.html.haml

@@ -0,0 +1,30 @@
+- content_for :page_title do
+  = t('admin.announcements.title')
+
+- content_for :heading_actions do
+  = link_to t('admin.announcements.new.title'), new_admin_announcement_path, class: 'button'
+
+.filters
+  .filter-subset
+    %strong= t('admin.relays.status')
+    %ul
+      %li= filter_link_to t('generic.all'), published: nil, unpublished: nil
+      %li= filter_link_to safe_join([t('admin.announcements.live'), "(#{number_with_delimiter(Announcement.published.count)})"], ' '), published: '1', unpublished: nil
+
+- if @announcements.empty?
+  %div.muted-hint.center-text
+    = t 'admin.announcements.empty'
+- else
+  .table-wrapper
+    %table.table
+      %thead
+        %tr
+          %th= t('simple_form.labels.announcement.text')
+          %th= t('admin.announcements.time_range')
+          %th= t('admin.announcements.published')
+          %th
+      %tbody
+        = render partial: 'announcement', collection: @announcements
+
+= paginate @announcements
+

app/views/admin/announcements/new.html.haml

@@ -0,0 +1,21 @@
+- content_for :page_title do
+  = t('.title')
+
+= simple_form_for @announcement, url: admin_announcements_path do |f|
+  = render 'shared/error_messages', object: @announcement
+
+  .fields-group
+    = f.input :starts_at, include_blank: true, wrapper: :with_block_label
+    = f.input :ends_at, include_blank: true, wrapper: :with_block_label
+
+  .fields-group
+    = f.input :all_day, as: :boolean, wrapper: :with_label
+
+  .fields-group
+    = f.input :text, wrapper: :with_block_label
+
+  .fields-group
+    = f.input :scheduled_at, include_blank: true, wrapper: :with_block_label
+
+  .actions
+    = f.button :button, t('.create'), type: :submit