refactor(profile): generalize profile from referrer or for user

app/controllers/concerns/nav_bar_profile_concern.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+module NavBarProfileConcern
+  extend ActiveSupport::Concern
+
+  included do
+    # Override this method on controller basis for more precise context or custom logic
+    def nav_bar_profile
+    end
+
+    def fallback_nav_bar_profile
+      return :guest if current_user.blank?
+
+      nav_bar_profile_from_referrer || default_nav_bar_profile_for_user
+    end
+
+    private
+
+    # Shared controllers (search, errors, release notes…) don't have specific context
+    # Simple attempt to try to re-use the profile from the previous page
+    # so user does'not feel lost.
+    def nav_bar_profile_from_referrer
+      # detect context from referer, simple (no detection when refreshing the page)
+      params = Rails.application.routes.recognize_path(request&.referer)
+
+      controller_class = "#{params[:controller].camelize}Controller".safe_constantize
+      return if controller_class.nil?
+
+      controller_instance = controller_class.new
+      controller_instance.try(:nav_bar_profile)
+    end
+
+    # Fallback for shared controllers from user account
+    # to the more relevant profile.
+    def default_nav_bar_profile_for_user
+      return :gestionnaire if current_user.gestionnaire?
+      return :administrateur if current_user.administrateur?
+      return :instructeur if current_user.instructeur?
+      return :expert if current_user.expert?
+
+      :user
+    end
+  end
+end