Refactor guidance links into a helper (#2551)

* Refactor guidance links into a helper

* Refactor discounted ownership guidance

app/helpers/guidance_helper.rb

@@ -0,0 +1,11 @@
+module GuidanceHelper
+  include GovukLinkHelper
+  include GovukVisuallyHiddenHelper
+
+  def question_link(question_id, log, user)
+    question = log.form.get_question(question_id, log)
+    return "" unless question.page.routed_to?(log, user)
+
+    "(#{govuk_link_to "Q#{question.question_number}", send("#{log.class.name.underscore}_#{question.page.id}_path", log)})".html_safe
+  end
+end

app/views/form/guidance/_financial_calculations_discounted_ownership.html.erb

@@ -1,14 +1,10 @@
-<% grant_page = log.form.get_question("grant", log).page %>
-<% mortgage_page = log.form.get_question("mortgage", log).page %>
-<% discount_page = log.form.get_question("discount", log).page %>
-<% deposit_page = log.form.get_question("deposit", log).page %>
 <%= govuk_details(summary_text: "How the financial values are calculated") do %>
   <p class="govuk-body">
-  The mortgage amount <%= "(#{govuk_link_to 'Q105', send("#{log.class.name.underscore}_#{mortgage_page.id}_path", log)})".html_safe if mortgage_page.routed_to?(log, current_user) %>
-   cash deposit <%= "(#{govuk_link_to 'Q109', send("#{log.class.name.underscore}_#{deposit_page.id}_path", log)})".html_safe if deposit_page.routed_to?(log, current_user) %>
-   and grant <%= "(#{govuk_link_to 'Q102', send("#{log.class.name.underscore}_#{grant_page.id}_path", log)})".html_safe if grant_page.routed_to?(log, current_user) %>
+  The mortgage amount <%= question_link("mortgage", log, current_user) %>
+   cash deposit <%= question_link("deposit", log, current_user) %>
+   and grant <%= question_link("grant", log, current_user) %>
    added together must equal
-   the purchase price (<%= govuk_link_to "Q101", send("#{log.class.name.underscore}_#{log.form.get_question('value', log).page.id}_path", log) %>)
-   multiplied by the discount stake <%= "(#{govuk_link_to '103', send("#{log.class.name.underscore}_#{discount_page.id}_path", log)})".html_safe if discount_page.routed_to?(log, current_user) %>
+   the purchase price <%= question_link("value", log, current_user) %>
+   multiplied by the discount stake <%= question_link("discount", log, current_user) %>
    </p>
 <% end %>

app/views/form/guidance/_financial_calculations_shared_ownership.html.erb

@@ -1,10 +1,16 @@
 <%= govuk_details(summary_text: "How the financial values are calculated") do %>
   <p class="govuk-body">
-  The mortgage amount (<%= govuk_link_to "Q92", send("#{log.class.name.underscore}_#{log.form.get_question('mortgage', log).page.id}_path", log) %>),
-   cash deposit (<%= govuk_link_to "Q95", send("#{log.class.name.underscore}_#{log.form.get_question('deposit', log).page.id}_path", log) %>)
-   and cash discount (<%= govuk_link_to "Q97", send("#{log.class.name.underscore}_#{log.form.get_question('cashdis', log).page.id}_path", log) %>)
+  The mortgage amount <%= question_link("mortgage", log, current_user) %>,
+   cash deposit <%= question_link("deposit", log, current_user) %>,
+   and cash discount <%= question_link("cashdis", log, current_user) %>
    added together must equal
-   the purchase price (<%= govuk_link_to "Q88", send("#{log.class.name.underscore}_#{log.form.get_question('value', log).page.id}_path", log) %>)
-   multiplied by the percentage equity stake (<%= govuk_link_to "Q89", send("#{log.class.name.underscore}_#{log.form.get_question('equity', log).page.id}_path", log) %>)
+   the purchase price <%= question_link("value", log, current_user) %>
+   <% stairbought_page = log.form.get_question("stairbought", log).page %>
+   <% equity_page = log.form.get_question("equity", log).page %>
+   <% if stairbought_page.routed_to?(log, current_user) %>
+      multiplied by the percentage bought <%= question_link("stairbought", log, current_user) %>
+    <% else %>
+      multiplied by the percentage equity stake <%= question_link("equity", log, current_user) %>
+    <% end %>
    </p>
 <% end %>

spec/helpers/guidance_helper_spec.rb

@@ -0,0 +1,21 @@
+require "rails_helper"
+
+RSpec.describe GuidanceHelper do
+  describe "#question_link" do
+    context "when question page is routed to" do
+      let(:log) { create(:sales_log, :shared_ownership_setup_complete, mortgageused: 2) }
+
+      it "returns an empty string if question is not routed to" do
+        expect(question_link("mortgage", log, log.assigned_to)).to eq("")
+      end
+    end
+
+    context "when question page is not routed to" do
+      let(:log) { create(:sales_log, :shared_ownership_setup_complete, mortgageused: 1) }
+
+      it "returns a link to the question with correct question number in brakets" do
+        expect(question_link("mortgage", log, log.assigned_to)).to eq("(<a class=\"govuk-link\" href=\"/sales-logs/#{log.id}/mortgage-amount-shared-ownership\">Q92</a>)")
+      end
+    end
+  end
+end