From e01bda8c40774bc321dc1a450e680d0e322afd41 Mon Sep 17 00:00:00 2001
From: Emanuele Coricciati <emanuelecoricciati@libero.it>
Date: Fri, 11 Oct 2024 18:24:10 +0200
Subject: [PATCH] fix(courses): switch course with no id to a previous edition

---
 src/core/queries/courseHooks.ts               | 54 ++++++++++++-------
 .../courses/components/CourseListItem.tsx     | 10 ++--
 src/features/courses/utils/courses.ts         | 28 ++++++++++
 3 files changed, 69 insertions(+), 23 deletions(-)
 create mode 100644 src/features/courses/utils/courses.ts

diff --git a/src/core/queries/courseHooks.ts b/src/core/queries/courseHooks.ts
index e9a64126..bf675b21 100644
--- a/src/core/queries/courseHooks.ts
+++ b/src/core/queries/courseHooks.ts
@@ -21,6 +21,7 @@ import {
 } from '@tanstack/react-query';
 
 import { CourseLectureSection } from '../../features/courses/types/CourseLectureSections';
+import { isCourseDetailed } from '../../features/courses/utils/courses';
 import { notNullish } from '../../utils/predicates';
 import { pluckData } from '../../utils/queries';
 import { courseColors } from '../constants';
@@ -56,10 +57,10 @@ const setupCourses = (
 
   courses?.forEach(c => {
     const newC = c as CourseOverview;
-
+    const hasDetails = isCourseDetailed(newC);
     newC.uniqueShortcode = c.shortcode + c.moduleNumber;
 
-    if (c.id && !(newC.uniqueShortcode in coursePreferences)) {
+    if (hasDetails && !(newC.uniqueShortcode in coursePreferences)) {
       const usedColors = Object.values(coursePreferences)
         .map(cp => cp.color)
         .filter(notNullish);
@@ -158,24 +159,39 @@ export const useGetCourseEditions = (courseId: number) => {
           c.id === courseId || c.previousEditions.some(e => e.id === courseId),
       );
       const editions: MenuAction[] = [];
-
       if (!course || !course.previousEditions.length) return editions;
-
-      editions.push(
-        {
-          id: `${course.id}`,
-          title: course.year,
-          state: courseId === course?.id ? 'on' : undefined,
-        },
-        ...course.previousEditions.map(
-          e =>
-            ({
-              id: `${e.id}`,
-              title: e.year,
-              state: courseId === e.id ? 'on' : undefined,
-            } as MenuAction),
-        ),
-      );
+      if (course.id) {
+        editions.push(
+          {
+            id: `${course.id}`,
+            title: course.year,
+            state: courseId === course?.id ? 'on' : undefined,
+          },
+          ...course.previousEditions.map(
+            e =>
+              ({
+                id: `${e.id}`,
+                title: e.year,
+                state: courseId === e.id ? 'on' : undefined,
+              } as MenuAction),
+          ),
+        );
+      } else {
+        const prevEditions = course.previousEditions
+          .filter(e => e.id !== null)
+          .sort((a, b) => +b.year - +a.year)
+          .slice(1);
+        editions.push(
+          ...prevEditions.map(
+            e =>
+              ({
+                id: `${e.id}`,
+                title: e.year,
+                state: courseId === e.id ? 'on' : undefined,
+              } as MenuAction),
+          ),
+        );
+      }
 
       return editions;
     },
diff --git a/src/features/courses/components/CourseListItem.tsx b/src/features/courses/components/CourseListItem.tsx
index 080cd902..f26e683f 100644
--- a/src/features/courses/components/CourseListItem.tsx
+++ b/src/features/courses/components/CourseListItem.tsx
@@ -17,6 +17,7 @@ import { getCourseKey } from '../../../core/queries/courseHooks';
 import { CourseOverview } from '../../../core/types/api';
 import { AGENDA_QUERY_PREFIX } from '../../agenda/queries/agendaHooks';
 import { LECTURES_QUERY_PREFIX } from '../../agenda/queries/lectureHooks';
+import { getLatestCourseInfo, isCourseDetailed } from '../utils/courses';
 import { CourseIndicator } from './CourseIndicator';
 
 interface Props {
@@ -79,7 +80,8 @@ export const CourseListItem = ({
   const { colors, spacing, fontSizes } = useTheme();
   const { t } = useTranslation();
 
-  const hasDetails = course.id != null;
+  const hasDetails = isCourseDetailed(course);
+  const courseInfo = getLatestCourseInfo(course);
   const queryClient = useQueryClient();
 
   const isDataMissing = useCallback(
@@ -116,9 +118,9 @@ export const CourseListItem = ({
           ? {
               screen: 'Course',
               params: {
-                id: course.id,
-                courseName: course.name,
-                uniqueShortcode: course.uniqueShortcode,
+                id: courseInfo?.id,
+                courseName: courseInfo?.name,
+                uniqueShortcode: courseInfo?.uniqueShortcode,
               },
             }
           : undefined
diff --git a/src/features/courses/utils/courses.ts b/src/features/courses/utils/courses.ts
new file mode 100644
index 00000000..90d3d527
--- /dev/null
+++ b/src/features/courses/utils/courses.ts
@@ -0,0 +1,28 @@
+import { CourseOverview } from '../../../core/types/api';
+
+export const isCourseDetailed = (course: CourseOverview) => {
+  if (course.id !== null) return true;
+  if (course.previousEditions.some(edition => edition.id !== null)) return true;
+  return false;
+};
+
+export const getLatestCourseInfo = (course: CourseOverview) => {
+  if (course.id !== null) {
+    return {
+      id: course.id,
+      name: course.name,
+      uniqueShortcode: course.uniqueShortcode,
+    };
+  }
+  const latestEdition = course.previousEditions
+    .filter(edition => edition.id !== null)
+    .sort((a, b) => +b.year - +a.year)[0];
+  if (latestEdition) {
+    return {
+      id: latestEdition.id,
+      name: course.name,
+      uniqueShortcode: course.uniqueShortcode,
+    };
+  }
+  return null;
+};