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

3 files changed, 32 insertions, 5 deletions

diff --git a/app/views/admin_mailer/new_trending_links.text.erb b/app/views/admin_mailer/new_trending_links.text.erb
new file mode 100644
index 000000000..51789aca5
--- /dev/null
+++ b/app/views/admin_mailer/new_trending_links.text.erb
@@ -0,0 +1,16 @@
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
+
+<%= raw t('admin_mailer.new_trending_links.body') %>
+
+<% @links.each do |link| %>
+- <%= link.title %> • <%= link.url %>
+  <%= t('admin.trends.links.usage_comparison', today: link.history.get(Time.now.utc).accounts, yesterday: link.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.links.score(link.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_link %>
+<%= t('admin_mailer.new_trending_links.requirements', lowest_link_title: @lowest_trending_link.title, lowest_link_score: Trends.links.score(@lowest_trending_link.id).round(2)) %>
+<% else %>
+<%= t('admin_mailer.new_trending_links.no_approved_links') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_links_url %>
diff --git a/app/views/admin_mailer/new_trending_tag.text.erb b/app/views/admin_mailer/new_trending_tag.text.erb
deleted file mode 100644
index e4bfdc591..000000000
--- a/app/views/admin_mailer/new_trending_tag.text.erb
+++ /dev/null
@@ -1,5 +0,0 @@
-<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
-
-<%= raw t('admin_mailer.new_trending_tag.body', name: @tag.name) %>
-
-<%= raw t('application_mailer.view')%> <%= admin_tags_url(pending_review: '1') %>
diff --git a/app/views/admin_mailer/new_trending_tags.text.erb b/app/views/admin_mailer/new_trending_tags.text.erb
new file mode 100644
index 000000000..5051e8a96
--- /dev/null
+++ b/app/views/admin_mailer/new_trending_tags.text.erb
@@ -0,0 +1,16 @@
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
+
+<%= raw t('admin_mailer.new_trending_tags.body') %>
+
+<% @tags.each do |tag| %>
+- #<%= tag.name %>
+  <%= t('admin.trends.tags.usage_comparison', today: tag.history.get(Time.now.utc).accounts, yesterday: tag.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.tags.score(tag.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_tag %>
+<%= t('admin_mailer.new_trending_tags.requirements', lowest_tag_name: @lowest_trending_tag.name, lowest_tag_score: Trends.tags.score(@lowest_trending_tag.id).round(2)) %>
+<% else %>
+<%= t('admin_mailer.new_trending_tags.no_approved_tags') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_tags_url(pending_review: '1') %>