add previous and next buttons (lectures are separate from assignments/quizzes/pages)

src/app/course/[courseName]/hooks/navigationLogic.ts

@@ -0,0 +1,83 @@
+import { CalendarItemsInterface } from "../context/calendarItemsContext";
+import { getLectureUrl, getModuleItemUrl } from "@/services/urlUtils";
+
+export type CourseItemType = "assignment" | "quiz" | "page" | "lecture";
+
+export interface OrderedCourseItem {
+  type: CourseItemType;
+  name: string;
+  moduleName?: string;
+  date: string;
+  url: string;
+}
+
+export function getOrderedItems(
+  courseName: string,
+  ...calendars: CalendarItemsInterface[]
+): OrderedCourseItem[] {
+  const itemTypes = [
+    { key: "assignments" as const, type: "assignment" as const },
+    { key: "quizzes" as const, type: "quiz" as const },
+    { key: "pages" as const, type: "page" as const },
+  ];
+
+  return calendars
+    .flatMap((calendar) =>
+      Object.entries(calendar).flatMap(([date, modules]) =>
+        Object.entries(modules).flatMap(([moduleName, moduleData]) =>
+          itemTypes.flatMap(({ key, type }) =>
+            (moduleData[key] || []).map((item) => ({
+              type,
+              name: item.name,
+              moduleName,
+              date,
+              url: getModuleItemUrl(courseName, moduleName, type, item.name),
+            }))
+          )
+        )
+      )
+    )
+    .sort((a, b) => {
+      const dateCompare = a.date.localeCompare(b.date);
+      if (dateCompare !== 0) return dateCompare;
+      return a.name.localeCompare(b.name);
+    });
+}
+
+export function getOrderedLectures(
+  weeks: { lectures: { date: string }[] }[],
+  courseName: string
+): OrderedCourseItem[] {
+  return weeks
+    .flatMap((week) => week.lectures)
+    .map((lecture) => ({
+      type: "lecture",
+      name: lecture.date,
+      date: lecture.date,
+      url: getLectureUrl(courseName, lecture.date),
+    }));
+}
+
+export function getNavigationLinks(
+  list: OrderedCourseItem[],
+  type: CourseItemType,
+  name: string,
+  moduleName?: string
+) {
+  const index = list.findIndex((item) => {
+    if (type === "lecture") return item.date === name;
+    return (
+      item.name === name && item.type === type && item.moduleName === moduleName
+    );
+  });
+
+  if (index === -1) return { previousUrl: null, nextUrl: null };
+
+  const previousIndex = (index - 1 + list.length) % list.length;
+  const nextIndex = (index + 1) % list.length;
+
+  return {
+    previousUrl: list[previousIndex].url,
+    nextUrl: list[nextIndex].url,
+  };
+}