From 930513d64b3aa81cbb09336d3f7349a914a2b8f9 Mon Sep 17 00:00:00 2001
From: Catalina Ilie <catalina.ilie@digital.cabinet-office.gov.uk>
Date: Tue, 15 Aug 2023 15:33:45 +0100
Subject: [PATCH] Enable taxonomy email signup for document collection Allow
 users to sign up to a mapped taxonomy topic email subscription from some
 document collection pages if taxonomy_topic_email_override is present.

---
 app/presenters/document_collection_presenter.rb |  4 ++++
 .../content_items/document_collection.html.erb  |  6 +++++-
 app/views/shared/_taxon_signup_link.html.erb    | 17 +++++++++++++++++
 test/integration/document_collection_test.rb    |  6 ++++++
 test/test_helper.rb                             | 10 ++++++++++
 5 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 app/views/shared/_taxon_signup_link.html.erb

diff --git a/app/presenters/document_collection_presenter.rb b/app/presenters/document_collection_presenter.rb
index ac977202c..def96cd3d 100644
--- a/app/presenters/document_collection_presenter.rb
+++ b/app/presenters/document_collection_presenter.rb
@@ -63,6 +63,10 @@ def group_heading(group)
     )
   end
 
+  def taxonomy_topic_email_override_base_path
+    content_item.dig("links", "taxonomy_topic_email_override", 0, "base_path")
+  end
+
 private
 
   def group_documents(group)
diff --git a/app/views/content_items/document_collection.html.erb b/app/views/content_items/document_collection.html.erb
index 7f3e398e2..5c1a80072 100644
--- a/app/views/content_items/document_collection.html.erb
+++ b/app/views/content_items/document_collection.html.erb
@@ -22,7 +22,11 @@
 </div>
 
 <%= render 'shared/publisher_metadata_with_logo' %>
-<%= render 'shared/single_page_notification_button', content_item: @content_item, skip_account: "true" %>
+<% if @content_item.taxonomy_topic_email_override_base_path.present? %>
+  <%= render 'shared/taxon_signup_link', base_path: @content_item.taxonomy_topic_email_override_base_path %>
+<% else %>
+  <%= render 'shared/single_page_notification_button', content_item: @content_item %>
+<% end %>
 
 <div class="govuk-grid-row">
   <div class="govuk-grid-column-two-thirds">
diff --git a/app/views/shared/_taxon_signup_link.html.erb b/app/views/shared/_taxon_signup_link.html.erb
new file mode 100644
index 000000000..d7770b048
--- /dev/null
+++ b/app/views/shared/_taxon_signup_link.html.erb
@@ -0,0 +1,17 @@
+<div
+  data-module="ga4-link-tracker"
+  data-ga4-link='{ "event_name": "navigation", "type": "subscribe", "index": { "index_link": 1 }, "index_total": 1, "section": "Top" }'
+  data-ga4-track-links-only
+>
+  <%= render "govuk_publishing_components/components/signup_link", {
+    link_text: "Get emails about this topic",
+    link_href: "/email-signup/?link=#{base_path}",
+    data: {
+      "module": "gem-track-click",
+      "track-category": "emailAlertLinkClicked",
+      "track-action": base_path,
+      "track-label": ""
+    },
+    margin_bottom: 6
+  } %>
+</div>
diff --git a/test/integration/document_collection_test.rb b/test/integration/document_collection_test.rb
index fdacbab3c..b77e93023 100644
--- a/test/integration/document_collection_test.rb
+++ b/test/integration/document_collection_test.rb
@@ -158,4 +158,10 @@ class DocumentCollectionTest < ActionDispatch::IntegrationTest
     setup_and_visit_content_item("document_collection")
     assert page.has_css?(".gem-c-single-page-notification-button")
   end
+
+  test "renders with the taxonomy subscription button" do
+    setup_and_visit_content_item_with_taxonomy_topic_email_override("document_collection")
+    assert page.has_css?(".gem-c-signup-link")
+    assert_not page.has_css?(".gem-c-single-page-notification-button")
+  end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index e4e6f9b1c..aba36990a 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -195,6 +195,16 @@ def setup_and_visit_content_item_with_taxons(name, taxons)
     end
   end
 
+  def setup_and_visit_content_item_with_taxonomy_topic_email_override(name)
+    @content_item = get_content_example(name).tap do |item|
+      item["links"]["taxonomy_topic_email_override"] = [{
+        "base_path": "test",
+      }]
+      stub_content_store_has_item(item["base_path"], item.to_json)
+      visit_with_cachebust(item["base_path"])
+    end
+  end
+
   def setup_and_visit_notification_exempt_page(name)
     @content_item = get_content_example(name).tap do |item|
       item["content_id"] = ContentItem::SinglePageNotificationButton::EXEMPTION_LIST[0]