From aa42751c7ef0e2a245efdc562934df3b6216ec3e Mon Sep 17 00:00:00 2001
From: "Dave St.Germain" <dstgermain@edx.org>
Date: Fri, 7 Feb 2020 12:42:18 -0500
Subject: [PATCH] Add button to switch to courseware MFE

---
 lms/djangoapps/courseware/views/index.py |  2 +-
 lms/templates/preview_menu.html          | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/lms/djangoapps/courseware/views/index.py b/lms/djangoapps/courseware/views/index.py
index 938c7d1dc8..4a0fcdd719 100644
--- a/lms/djangoapps/courseware/views/index.py
+++ b/lms/djangoapps/courseware/views/index.py
@@ -482,7 +482,7 @@ class CoursewareIndex(View):
                 table_of_contents['previous_of_active_section'],
                 table_of_contents['next_of_active_section'],
             )
-
+            courseware_context['unit'] = section_context.get('activate_block_id', '')
             courseware_context['fragment'] = self.section.render(self.view, section_context)
 
             if self.section.position and self.section.has_children:
diff --git a/lms/templates/preview_menu.html b/lms/templates/preview_menu.html
index 7b239d78d8..44e0d546a9 100644
--- a/lms/templates/preview_menu.html
+++ b/lms/templates/preview_menu.html
@@ -19,6 +19,16 @@ show_preview_menu = course and can_masquerade and supports_preview_menu
     def selected(is_selected):
       return "selected" if is_selected else ""
 
+    def get_mfe_link():
+      if section:
+          mfe_link = '{}course/{}/{}'.format(settings.LEARNING_MICROFRONTEND_URL, course.id, section.location)
+          if unit:
+            mfe_link += '/' + unit
+      else:
+        mfe_link = None
+      return mfe_link
+
+    mfe_link = get_mfe_link()
     course_partitions = get_all_partitions_for_course(course)
     masquerade_user_name = masquerade.user_name if masquerade else None
     masquerade_group_id = masquerade.group_id if masquerade else None
@@ -66,6 +76,12 @@ show_preview_menu = course and can_masquerade and supports_preview_menu
                     </p>
                 </div>
             % endif
+            % if user.is_staff and mfe_link:
+            <div style="text-align: right;float:right;padding-bottom:5px">
+                <p style="color: white; display: inline-block; margin-right: 10px;">We're working on a new learning sequence experience</p>
+                <a class="btn btn-primary" style="border: solid 1px white;" href="${mfe_link}">View this unit in the new experience</a>
+            </div>
+            % endif
         </div>
     </nav>