From e64d588833cf1262a6bcd2b32157eba917bd801b Mon Sep 17 00:00:00 2001
From: Sergey Yarkov <serzh.yarkov@gmail.com>
Date: Mon, 6 Jun 2022 22:50:25 +0300
Subject: [PATCH] fix: do not change lesson order on deleting last lesson in
 course

---
 src/pages/course/course.tsx                                 | 6 +++---
 src/pages/courses/edit/components/LessonList/LessonList.tsx | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/pages/course/course.tsx b/src/pages/course/course.tsx
index c4d72ac..8b86d16 100644
--- a/src/pages/course/course.tsx
+++ b/src/pages/course/course.tsx
@@ -46,7 +46,7 @@ const CoursePage: React.FC<IPageProps> = () => {
   const isEmptyLessons = course.lessons.length === 0;
   const isEmptyStudents = course.students.length === 0;
 
-  const handleWatchCourse = () => history.push(`/lesson/${course.lessons[0].id}`);
+  const handleWatchCourse = () => course.lessons[0] && history.push(`/lesson/${course.lessons[0].id}`);
 
   const handleEditCourse = () => history.push(`/courses/edit/${course.id}`);
 
@@ -74,7 +74,7 @@ const CoursePage: React.FC<IPageProps> = () => {
                 <Box>
                   {(me.isAdmin || me.isTeacher) && <EditButton onClick={handleEditCourse} mr='2' />}
                   <Button
-                    isDisabled={!isCourseAvailable}
+                    isDisabled={!isCourseAvailable || course.lessons[0] === undefined}
                     onClick={handleWatchCourse}
                     leftIcon={<MdPlayCircleOutline />}
                     size='sm'
@@ -133,7 +133,7 @@ const CoursePage: React.FC<IPageProps> = () => {
               <Text fontSize={'2xl'} fontWeight={'medium'}>
                 What you&apos;ll learn.
               </Text>
-              <Text fontSize={'sm'} mt='2'>
+              <Text fontSize={'sm'} mt='2' textAlign={'justify'}>
                 {course.education_description}
               </Text>
             </Box>
diff --git a/src/pages/courses/edit/components/LessonList/LessonList.tsx b/src/pages/courses/edit/components/LessonList/LessonList.tsx
index d5f8197..59d60b9 100644
--- a/src/pages/courses/edit/components/LessonList/LessonList.tsx
+++ b/src/pages/courses/edit/components/LessonList/LessonList.tsx
@@ -69,6 +69,7 @@ const LessonList: React.FC<LessonListPropsType> = ({ course }) => {
 
   const handleChangeOrder = async (ids: string[]) => {
     try {
+      if (ids.length <= 0) return;
       const data = await LessonServiceInstance.saveOrder(ids);
       return data;
     } catch (error) {