feat: add activity message for priority change (#6933)

* feat: add priority const

* feat: add toggle priority method

* feat: update controller route and specs

* refactor: status change method

* refactor: abstract label change and mute activity

* feat: add priority change_activity

* fix: interpolation for previous_changes

* refactor: reduce cognitive complexity of priority_change_activity

* refactor: move priority activity message handler to a separate module

* refactor: move typing logic to a service

* refactor: tests to reduce complexity

* fix: typo

* fix: constants

* fix: priority conditions

* fix: add a response

* fix: argument destructuring in I18n.t

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

spec/controllers/api/v1/accounts/conversations_controller_spec.rb

@@ -434,6 +434,52 @@ RSpec.describe 'Conversations API', type: :request do
     end
   end
 
+  describe 'POST /api/v1/accounts/{account.id}/conversations/:id/toggle_priority' do
+    let(:conversation) { create(:conversation, account: account) }
+
+    context 'when it is an unauthenticated user' do
+      it 'returns unauthorized' do
+        post "/api/v1/accounts/#{account.id}/conversations/#{conversation.display_id}/toggle_priority"
+
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+
+    context 'when it is an authenticated user' do
+      let(:agent) { create(:user, account: account, role: :agent) }
+      let(:administrator) { create(:user, account: account, role: :administrator) }
+
+      before do
+        create(:inbox_member, user: agent, inbox: conversation.inbox)
+      end
+
+      it 'toggles the conversation priority to nil if no value is passed' do
+        expect(conversation.priority).to be_nil
+
+        post "/api/v1/accounts/#{account.id}/conversations/#{conversation.display_id}/toggle_priority",
+             headers: agent.create_new_auth_token,
+             params: { priority: 'low' },
+             as: :json
+
+        expect(response).to have_http_status(:success)
+        expect(conversation.reload.priority).to eq('low')
+      end
+
+      it 'toggles the conversation priority' do
+        conversation.priority = 'low'
+        conversation.save!
+        expect(conversation.reload.priority).to eq('low')
+
+        post "/api/v1/accounts/#{account.id}/conversations/#{conversation.display_id}/toggle_priority",
+             headers: agent.create_new_auth_token,
+             as: :json
+
+        expect(response).to have_http_status(:success)
+        expect(conversation.reload.priority).to be_nil
+      end
+    end
+  end
+
   describe 'POST /api/v1/accounts/{account.id}/conversations/:id/toggle_typing_status' do
     let(:conversation) { create(:conversation, account: account) }