Refactor minutes UI methods

Some of the logic in `Ci::Minutes::Quota` is only used to determine
whether or not to show CI minutes information in the UI. This commit
refactors and renames that logic to make it more clear that it is being
used only for UI purposes.

ee/app/models/ci/minutes/quota.rb

@@ -16,9 +16,7 @@ module Ci
       end
 
       def enabled?
-        strong_memoize(:enabled) do
-          namespace_eligible? && total_minutes.nonzero?
-        end
+        namespace_root? && total_minutes.nonzero?
       end
 
       # Status of the monthly allowance being used.
@@ -50,28 +48,34 @@ module Ci
         enabled? && total_minutes_used >= total_minutes
       end
 
-      def total_minutes
-        @total_minutes ||= monthly_minutes + purchased_minutes
+      def percent_total_minutes_remaining
+        return 0 if total_minutes == 0
+
+        100 * total_minutes_remaining.to_i / total_minutes
       end
 
-      def total_minutes_used
-        @total_minutes_used ||= namespace.shared_runners_seconds.to_i / 60
+      def current_balance
+        total_minutes.to_i - total_minutes_used
       end
 
-      def percent_total_minutes_remaining
-        return 0 if total_minutes == 0
+      def display_shared_runners_data?
+        namespace_root? && any_project_enabled?
+      end
 
-        100 * total_minutes_remaining.to_i / total_minutes
+      def display_minutes_available_data?
+        display_shared_runners_data? && total_minutes.nonzero?
       end
 
-      def namespace_eligible?
-        strong_memoize(:namespace_eligible) do
-          namespace.root?
+      def total_minutes
+        strong_memoize(:total_minutes) do
+          monthly_minutes + purchased_minutes
         end
       end
 
-      def current_balance
-        total_minutes.to_i - total_minutes_used
+      def total_minutes_used
+        strong_memoize(:total_minutes_used) do
+          namespace.shared_runners_seconds.to_i / 60
+        end
       end
 
       def any_project_enabled?
@@ -82,13 +86,15 @@ module Ci
 
       private
 
+      attr_reader :namespace
+
       def minutes_limit
-        return monthly_minutes if enabled? && any_project_enabled?
+        return _('Not supported') unless display_shared_runners_data?
 
-        if namespace_eligible? && any_project_enabled?
-          _('Unlimited')
+        if display_minutes_available_data?
+          monthly_minutes
         else
-          _('Not supported')
+          _('Unlimited')
         end
       end
 
@@ -137,14 +143,22 @@ module Ci
       end
 
       def monthly_minutes
-        @monthly_minutes ||= (namespace.shared_runners_minutes_limit || ::Gitlab::CurrentSettings.shared_runners_minutes).to_i
+        strong_memoize(:monthly_minutes) do
+          (namespace.shared_runners_minutes_limit || ::Gitlab::CurrentSettings.shared_runners_minutes).to_i
+        end
       end
 
       def purchased_minutes
-        @purchased_minutes ||= namespace.extra_shared_runners_minutes_limit.to_i
+        strong_memoize(:purchased_minutes) do
+          namespace.extra_shared_runners_minutes_limit.to_i
+        end
       end
 
-      attr_reader :namespace
+      def namespace_root?
+        strong_memoize(:namespace_root) do
+          namespace.root?
+        end
+      end
     end
   end
 end

ee/app/views/namespaces/_additional_minutes_status.html.haml

@@ -5,7 +5,7 @@
 - return unless minutes_quota.enabled?
 
 
-- if minutes_quota.namespace_eligible? && minutes_quota.any_project_enabled?
+- if minutes_quota.display_shared_runners_data?
   %li
     %span.light= _('Additional minutes:')
     %strong

ee/app/views/namespaces/_shared_runner_status.html.haml

 - namespace = local_assigns.fetch(:namespace)
 - minutes_quota = namespace.ci_minutes_quota
 
-- if minutes_quota.namespace_eligible? && minutes_quota.any_project_enabled?
+- if minutes_quota.display_shared_runners_data?
   %li
     %span.light= _('Pipeline minutes quota:')
     %strong

ee/app/views/namespaces/pipelines_quota/_extra_shared_runners_minutes_quota.html.haml

 - return unless Gitlab.com?
 
 - minutes_quota = namespace.ci_minutes_quota
-- return unless minutes_quota.enabled? && minutes_quota.purchased_minutes_report.limit > 0 && minutes_quota.any_project_enabled?
+- return unless minutes_quota.display_minutes_available_data? && minutes_quota.purchased_minutes_report.limit > 0
 
 .row
   .col-sm-6

ee/app/views/namespaces/pipelines_quota/_list.haml

@@ -26,7 +26,7 @@
         = link_to sprite_icon('question-o'), help_page_path('user/admin_area/settings/continuous_integration', anchor: 'shared-runners-pipeline-minutes-quota'), target: '_blank', 'aria-label': _('Shared runners help link')
 
     .col-sm-6.right
-      - if minutes_quota.enabled? && minutes_quota.any_project_enabled?
+      - if minutes_quota.display_minutes_available_data?
         #{minutes_quota.monthly_percent_used}% used
       - elsif !minutes_quota.any_project_enabled?
         0% used

ee/spec/models/ci/minutes/quota_spec.rb

@@ -5,7 +5,7 @@ RSpec.describe Ci::Minutes::Quota do
   using RSpec::Parameterized::TableSyntax
 
   let_it_be_with_reload(:namespace) do
-    create(:namespace, namespace_statistics: create(:namespace_statistics))
+    create(:group, namespace_statistics: create(:namespace_statistics))
   end
 
   let(:quota) { described_class.new(namespace) }
@@ -67,7 +67,7 @@ RSpec.describe Ci::Minutes::Quota do
     context 'when the quota is not enabled' do
       before do
         allow(quota).to receive(:enabled?).and_return(false)
-        allow(quota).to receive(:namespace_eligible?).and_return(namespace_eligible)
+        allow(namespace).to receive(:root?).and_return(namespace_eligible)
         allow(namespace).to receive(:any_project_with_shared_runners_enabled?).and_return(true)
       end
 
@@ -394,36 +394,6 @@ RSpec.describe Ci::Minutes::Quota do
     end
   end
 
-  describe '#namespace_eligible?' do
-    subject { quota.namespace_eligible? }
-
-    context 'when namespace is a subgroup' do
-      it 'is false' do
-        allow(namespace).to receive(:root?).and_return(false)
-
-        expect(subject).to be_falsey
-      end
-    end
-
-    context 'when namespace is root' do
-      it 'is true' do
-        expect(subject).to be_truthy
-      end
-    end
-
-    it 'does not trigger additional queries when called multiple times' do
-      # memoizes the result
-      quota.namespace_eligible?
-
-      # count
-      actual = ActiveRecord::QueryRecorder.new do
-        quota.namespace_eligible?
-      end
-
-      expect(actual.count).to eq(0)
-    end
-  end
-
   describe '#any_project_enabled?' do
     let_it_be(:project) { create(:project, namespace: namespace) }
 
@@ -459,4 +429,66 @@ RSpec.describe Ci::Minutes::Quota do
       expect(actual.count).to eq(0)
     end
   end
+
+  describe '#display_shared_runners_data?' do
+    let_it_be(:project) { create(:project, namespace: namespace, shared_runners_enabled: true) }
+
+    subject { quota.display_shared_runners_data? }
+
+    context 'when the namespace is root and it has a project with shared runners enabled' do
+      it { is_expected.to be_truthy }
+    end
+
+    context 'when the namespace is not root' do
+      let(:namespace) { create(:group, :nested) }
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when the namespaces has no project with shared runners enabled' do
+      before do
+        project.update!(shared_runners_enabled: false)
+      end
+
+      it { is_expected.to be_falsey }
+    end
+  end
+
+  describe '#display_minutes_available_data?' do
+    let_it_be(:project) { create(:project, namespace: namespace, shared_runners_enabled: true) }
+
+    subject { quota.display_minutes_available_data? }
+
+    context 'when the namespace is root and it has a project with shared runners enabled' do
+      context 'when there is a minutes limit' do
+        before do
+          namespace.update!(shared_runners_minutes_limit: 200)
+        end
+
+        it { is_expected.to be_truthy }
+      end
+
+      context 'when there is no minutes limit' do
+        before do
+          namespace.update!(shared_runners_minutes_limit: 0)
+        end
+
+        it { is_expected.to be_falsey }
+      end
+    end
+
+    context 'when the namespace is not root' do
+      let(:namespace) { create(:group, :nested) }
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when the namespaces has no project with shared runners enabled' do
+      before do
+        project.update!(shared_runners_enabled: false)
+      end
+
+      it { is_expected.to be_falsey }
+    end
+  end
 end