Add trending links (#16917)

* Add trending links

* Add overriding specific links trendability

* Add link type to preview cards and only trend articles

Change trends review notifications from being sent every 5 minutes to being sent every 2 hours

Change threshold from 5 unique accounts to 15 unique accounts

* Fix tests

2 files changed, 62 insertions, 0 deletions

diff --git a/app/views/admin/trends/tags/_tag.html.haml b/app/views/admin/trends/tags/_tag.html.haml
new file mode 100644
index 000000000..c4af77b00
--- /dev/null
+++ b/app/views/admin/trends/tags/_tag.html.haml
@@ -0,0 +1,24 @@
+.batch-table__row{ class: [tag.requires_review? && 'batch-table__row--attention', !tag.requires_review? && !tag.trendable? && 'batch-table__row--muted'] }
+  %label.batch-table__row__select.batch-table__row__select--aligned.batch-checkbox
+    = f.check_box :tag_ids, { multiple: true, include_hidden: false }, tag.id
+
+  .batch-table__row__content.pending-account
+    .pending-account__header
+      = link_to admin_tag_path(tag.id) do
+        = fa_icon 'hashtag'
+        = tag.name
+
+      %br/
+
+      = t('admin.trends.tags.used_by_over_week', count: tag.history.reduce(0) { |sum, day| sum + day.accounts })
+
+      - if tag.trendable? && (rank = Trends.tags.rank(tag.id))
+        •
+        %abbr{ title: t('admin.trends.tags.current_score', score: Trends.tags.score(tag.id)) }= t('admin.trends.tags.trending_rank', rank: rank + 1)
+
+        - if tag.max_score_at && tag.max_score_at >= Trends::Tags::MAX_SCORE_COOLDOWN.ago && tag.max_score_at < 1.day.ago
+          •
+          = t('admin.trends.tags.peaked_on_and_decaying', date: l(tag.max_score_at.to_date, format: :short))
+      - elsif tag.requires_review?
+        •
+        = t('admin.trends.pending_review')
diff --git a/app/views/admin/trends/tags/index.html.haml b/app/views/admin/trends/tags/index.html.haml
new file mode 100644
index 000000000..8df0a9920
--- /dev/null
+++ b/app/views/admin/trends/tags/index.html.haml
@@ -0,0 +1,38 @@
+- content_for :page_title do
+  = t('admin.trends.tags.title')
+
+- content_for :header_tags do
+  = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
+
+.filters
+  .filter-subset
+    %strong= t('admin.tags.review')
+    %ul
+      %li= filter_link_to t('generic.all'), status: nil
+      %li= filter_link_to t('admin.trends.approved'), status: 'approved'
+      %li= filter_link_to t('admin.trends.rejected'), status: 'rejected'
+      %li= filter_link_to safe_join([t('admin.accounts.moderation.pending'), "(#{Tag.pending_review.count})"], ' '), status: 'pending_review'
+
+%hr.spacer/
+
+= form_for(@form, url: batch_admin_trends_tags_path) do |f|
+  = hidden_field_tag :page, params[:page] || 1
+
+  - TagFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
+  .batch-table.optional
+    .batch-table__toolbar
+      %label.batch-table__toolbar__select.batch-checkbox-all
+        = check_box_tag :batch_checkbox_all, nil, false
+      .batch-table__toolbar__actions
+        = f.button safe_join([fa_icon('check'), t('admin.trends.allow')]), name: :approve, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.disallow')]), name: :reject, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+
+    .batch-table__body
+      - if @tags.empty?
+        = nothing_here 'nothing-here--under-tabs'
+      - else
+        = render partial: 'tag', collection: @tags, locals: { f: f }
+
+= paginate @tags