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

src/app/course/[courseName]/components/ItemNavigationButtons.tsx

@@ -0,0 +1,24 @@
+import Link from "next/link";
+
+export default function ItemNavigationButtons({
+  previousUrl,
+  nextUrl,
+}: {
+  previousUrl: string | null;
+  nextUrl: string | null;
+}) {
+  return (
+    <>
+      {previousUrl && (
+        <Link className="btn" href={previousUrl} shallow={true}>
+          Previous
+        </Link>
+      )}
+      {nextUrl && (
+        <Link className="btn" href={nextUrl} shallow={true}>
+          Next
+        </Link>
+      )}
+    </>
+  );
+}

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

@@ -0,0 +1,70 @@
+import { describe, it, expect } from "vitest";
+import {
+  getOrderedItems,
+  getOrderedLectures,
+  getNavigationLinks,
+  OrderedCourseItem,
+} from "./navigationLogic";
+import { CalendarItemsInterface } from "../context/calendarItemsContext";
+
+describe("navigationLogic", () => {
+  const courseName = "testCourse";
+
+  it("getOrderedItems should order items by date, then alphabetically by name", () => {
+    const createMock = (
+      date: string,
+      name: string,
+      key: "assignments" | "quizzes" | "pages"
+    ) =>
+      ({
+        [date]: { "Module 1": { [key]: [{ name }] } },
+      } as unknown as CalendarItemsInterface);
+
+    const orderedItems = getOrderedItems(
+      courseName,
+      createMock("2023-01-01", "Z Assignment", "assignments"),
+      createMock("2023-01-01", "A Quiz", "quizzes"),
+      createMock("2023-01-02", "B Assignment", "assignments"),
+      createMock("2023-01-02", "A Page", "pages")
+    );
+
+    expect(orderedItems.map((i) => `${i.date} ${i.name}`)).toEqual([
+      "2023-01-01 A Quiz",
+      "2023-01-01 Z Assignment",
+      "2023-01-02 A Page",
+      "2023-01-02 B Assignment",
+    ]);
+  });
+
+  it("getNavigationLinks should handle wrapping and normal navigation", () => {
+    const items: OrderedCourseItem[] = [
+      { type: "assignment", name: "1", moduleName: "M", date: "D", url: "u1" },
+      { type: "quiz", name: "2", moduleName: "M", date: "D", url: "u2" },
+      { type: "page", name: "3", moduleName: "M", date: "D", url: "u3" },
+    ];
+
+    // Forward wrap (last -> first)
+    expect(getNavigationLinks(items, "page", "3", "M").nextUrl).toBe("u1");
+
+    // Backward wrap (first -> last)
+    expect(getNavigationLinks(items, "assignment", "1", "M").previousUrl).toBe(
+      "u3"
+    );
+
+    // Normal navigation (middle)
+    const middle = getNavigationLinks(items, "quiz", "2", "M");
+    expect(middle.previousUrl).toBe("u1");
+    expect(middle.nextUrl).toBe("u3");
+  });
+
+  it("getOrderedLectures should flatten weeks and generate correct URLs", () => {
+    const weeks = [
+      { lectures: [{ date: "01/01/2023" }] },
+      { lectures: [{ date: "01/02/2023" }, { date: "01/03/2023" }] },
+    ];
+    const lectures = getOrderedLectures(weeks as any, courseName);
+    expect(lectures).toHaveLength(3);
+    expect(lectures[0].url).toContain(encodeURIComponent("01/01/2023"));
+    expect(lectures[0].type).toBe("lecture");
+  });
+});

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,
+  };
+}

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

@@ -0,0 +1,14 @@
+import { useOrderedCourseItems } from "./useOrderedCourseItems";
+import { getNavigationLinks, CourseItemType } from "./navigationLogic";
+
+export function useItemNavigation(
+  type: CourseItemType,
+  name: string,
+  moduleName?: string
+) {
+  const { orderedItems, orderedLectures } = useOrderedCourseItems();
+
+  const list = type === "lecture" ? orderedLectures : orderedItems;
+
+  return getNavigationLinks(list, type, name, moduleName);
+}

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

@@ -0,0 +1,24 @@
+import {
+  useCourseAssignmentsByModuleByDateQuery,
+  useCoursePagesByModuleByDateQuery,
+  useCourseQuizzesByModuleByDateQuery,
+} from "@/features/local/modules/localCourseModuleHooks";
+import { useLecturesSuspenseQuery } from "@/features/local/lectures/lectureHooks";
+import { useCourseContext } from "../context/courseContext";
+import { getOrderedItems, getOrderedLectures } from "./navigationLogic";
+
+export function useOrderedCourseItems() {
+  const { courseName } = useCourseContext();
+  const { data: weeks } = useLecturesSuspenseQuery();
+
+  const orderedItems = getOrderedItems(
+    courseName,
+    useCourseAssignmentsByModuleByDateQuery(),
+    useCourseQuizzesByModuleByDateQuery(),
+    useCoursePagesByModuleByDateQuery()
+  );
+
+  const orderedLectures = getOrderedLectures(weeks, courseName);
+
+  return { orderedItems, orderedLectures };
+}

src/app/course/[courseName]/lecture/[lectureDay]/LectureButtons.tsx

@@ -9,6 +9,8 @@ import { useCourseContext } from "../../context/courseContext";
 import { useLocalCourseSettingsQuery } from "@/features/local/course/localCoursesHooks";
 import { useDeleteLectureMutation } from "@/features/local/lectures/lectureHooks";
 import Link from "next/link";
+import { useItemNavigation } from "../../hooks/useItemNavigation";
+import ItemNavigationButtons from "../../components/ItemNavigationButtons";
 
 export default function LectureButtons({ lectureDay }: { lectureDay: string }) {
   const { courseName } = useCourseContext();
@@ -17,6 +19,7 @@ export default function LectureButtons({ lectureDay }: { lectureDay: string }) {
   const [isLoading, setIsLoading] = useState(false);
   const modal = useModal();
   const deleteLecture = useDeleteLectureMutation();
+  const { previousUrl, nextUrl } = useItemNavigation("lecture", lectureDay);
 
   return (
     <div className="p-5 flex flex-row justify-end gap-3">
@@ -61,6 +64,7 @@ export default function LectureButtons({ lectureDay }: { lectureDay: string }) {
       <Link className="btn" href={getCourseUrl(courseName)} shallow={true}>
         Go Back
       </Link>
+      <ItemNavigationButtons previousUrl={previousUrl} nextUrl={nextUrl} />
       {isLoading && <Spinner />}
     </div>
   );

src/app/course/[courseName]/modules/[moduleName]/assignment/[assignmentName]/AssignmentFooterButtons.tsx

@@ -17,6 +17,8 @@ import { getCourseUrl } from "@/services/urlUtils";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import { useState } from "react";
+import { useItemNavigation } from "../../../../hooks/useItemNavigation";
+import ItemNavigationButtons from "../../../../components/ItemNavigationButtons";
 
 export function AssignmentFooterButtons({
   moduleName,
@@ -42,6 +44,11 @@ export function AssignmentFooterButtons({
   const deleteLocal = useDeleteAssignmentMutation();
   const [isLoading, setIsLoading] = useState(false);
   const modal = useModal();
+  const { previousUrl, nextUrl } = useItemNavigation(
+    "assignment",
+    assignmentName,
+    moduleName
+  );
 
   const assignmentInCanvas = canvasAssignments?.find(
     (a) => a.name === assignmentName
@@ -155,6 +162,7 @@ export function AssignmentFooterButtons({
         <Link className="btn" href={getCourseUrl(courseName)} shallow={true}>
           Go Back
         </Link>
+        <ItemNavigationButtons previousUrl={previousUrl} nextUrl={nextUrl} />
       </div>
     </div>
   );

src/app/course/[courseName]/modules/[moduleName]/page/[pageName]/EditPageButtons.tsx

@@ -17,6 +17,8 @@ import { getCourseUrl } from "@/services/urlUtils";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import React, { useState } from "react";
+import { useItemNavigation } from "../../../../hooks/useItemNavigation";
+import ItemNavigationButtons from "../../../../components/ItemNavigationButtons";
 
 export default function EditPageButtons({
   moduleName,
@@ -36,6 +38,11 @@ export default function EditPageButtons({
   const deletePageLocal = useDeletePageMutation();
   const modal = useModal();
   const [loading, setLoading] = useState(false);
+  const { previousUrl, nextUrl } = useItemNavigation(
+    "page",
+    pageName,
+    moduleName
+  );
 
   const pageInCanvas = canvasPages?.find((p) => p.title === pageName);
 
@@ -125,6 +132,7 @@ export default function EditPageButtons({
       <Link className="btn" href={getCourseUrl(courseName)} shallow={true}>
         Go Back
       </Link>
+      <ItemNavigationButtons previousUrl={previousUrl} nextUrl={nextUrl} />
     </div>
   );
 }

src/app/course/[courseName]/modules/[moduleName]/quiz/[quizName]/QuizButton.tsx

@@ -15,6 +15,8 @@ import {
 import { getCourseUrl } from "@/services/urlUtils";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
+import { useItemNavigation } from "../../../../hooks/useItemNavigation";
+import ItemNavigationButtons from "../../../../components/ItemNavigationButtons";
 
 export function QuizButtons({
   moduleName,
@@ -35,6 +37,11 @@ export function QuizButtons({
   const deleteFromCanvas = useDeleteQuizFromCanvasMutation();
   const deleteLocal = useDeleteQuizMutation();
   const modal = useModal();
+  const { previousUrl, nextUrl } = useItemNavigation(
+    "quiz",
+    quizName,
+    moduleName
+  );
 
   const quizInCanvas = canvasQuizzes?.find((c) => c.title === quizName);
 
@@ -111,6 +118,7 @@ export function QuizButtons({
         <Link className="btn" href={getCourseUrl(courseName)} shallow={true}>
           Go Back
         </Link>
+        <ItemNavigationButtons previousUrl={previousUrl} nextUrl={nextUrl} />
       </div>
     </div>
   );