Display protection_type logo

This is a departmental request that came through
[Zendesk](https://govuk.zendesk.com/agent/tickets/4197468) and will
conditionally display logos for specialist documents of the newly added
type `protected_food_drink_name`.

Context on why and how `protected_food_drink_name` was added can be
found in these PRs:
- alphagov/specialist-publisher#1720
- alphagov/govuk-content-schemas#1013
- alphagov/search-api#2186
- #1867

The logos added are placeholders while we wait for higher resolution and
properly cropped ones.

The test added in
`test/presenters/specialist_document_presenter_test.rb:21`
depends on the the schema example added in
alphagov/govuk-content-schemas#1020

Trello card: https://trello.com/c/NKJYyZep/2157-3-update-protected-food-names-frontend-template

app/assets/stylesheets/views/_specialist-document.scss

@@ -1,3 +1,10 @@
 .specialist-document {
   @include sidebar-with-body;
 }
+
+.protected-food-drink-name-logo {
+  float: right;
+  width: 150px;
+  padding-left: 2em;
+  padding-bottom: 2em;
+}

app/presenters/specialist_document_presenter.rb

@@ -52,6 +52,31 @@ def finder_link
     end
   end
 
+  def protected_food_drink_name?
+    content_item["document_type"] == "protected_food_drink_name"
+  end
+
+  def protection_type
+    content_item.dig("details", "metadata", "protection_type")
+  end
+
+  def images
+    {
+      "protected-designation-of-origin-pdo" => {
+        "url" => view_context.image_url("protected-food-drink-names/protected-designation-of-origin-pdo.png"),
+        "alt_text" => "The scheme logo is a black stamp with the words Designated Origin UK Protected",
+      },
+      "protected-geographical-indication-pgi" => {
+        "url" => view_context.image_url("protected-food-drink-names/protected-geographical-indication-pgi.png"),
+        "alt_text" => "The scheme logo is a black stamp with the words Geographic Origin UK Protected",
+      },
+      "traditional-speciality-guaranteed-tsg" => {
+        "url" => view_context.image_url("protected-food-drink-names/traditional-speciality-guaranteed-tsg.png"),
+        "alt_text" => "The scheme logo is a black stamp with the words Traditional Speciality UK Protected",
+      },
+    }
+  end
+
 private
 
   def nested_headers

app/views/content_items/specialist_document.html.erb

@@ -24,6 +24,15 @@
         items: @content_item.important_metadata %>
 
     <%= render "components/contents-list-with-body", contents: @content_item.contents do %>
+
+      <% if @content_item.protected_food_drink_name? %>
+        <img
+          class="app-c-figure__image protected-food-drink-name-logo"
+          src="<%= @content_item.images.dig(@content_item.protection_type, "url") %>"
+          alt="<%= @content_item.images.dig(@content_item.protection_type, "alt_text") %>"
+        >
+      <% end %>
+
       <div class="responsive-bottom-margin">
         <%= render 'govuk_publishing_components/components/govspeak', @content_item.govspeak_body %>
         <% if @content_item.continuation_link %>

test/presenters/specialist_document_presenter_test.rb

@@ -18,6 +18,18 @@ class PresentedSpecialistDocument < SpecialistDocumentTestCase
       assert_equal expected_body, presented_item("aaib-reports").body
     end
 
+    test "presents the protection_type when specialist document's schema is 'protected-food-drink-names'" do
+      protection_type = "protected-designation-of-origin-pdo"
+
+      assert_equal protection_type, presented_item("protected-food-drink-names").protection_type
+      assert_equal protection_type, schema_item("protected-food-drink-names")["details"]["metadata"]["protection_type"]
+    end
+
+    test "does not present the protection_type when specialist document's schema is not 'protected-food-drink-names'" do
+      assert_nil schema_item("aaib-reports")["details"]["metadata"]["protection_type"]
+      assert_nil presented_item("aaib-reports").protection_type
+    end
+
     test "has metadata" do
       assert presented_item("aaib-reports").is_a?(ContentItem::Metadata)
     end