First commit

lib/progress/localProgress.ts

@@ -0,0 +1,86 @@
+export type CourseProgress = {
+  lastLessonId: string | null;
+  completedLessonIds: string[];
+};
+
+const STORAGE_KEY = "acve.local-progress.v1";
+const PROGRESS_UPDATED_EVENT = "acve:progress-updated";
+
+type ProgressStore = Record<string, Record<string, CourseProgress>>;
+
+const defaultProgress: CourseProgress = {
+  lastLessonId: null,
+  completedLessonIds: [],
+};
+
+const isBrowser = () => typeof window !== "undefined";
+
+const readStore = (): ProgressStore => {
+  if (!isBrowser()) return {};
+
+  const raw = window.localStorage.getItem(STORAGE_KEY);
+  if (!raw) return {};
+
+  try {
+    return JSON.parse(raw) as ProgressStore;
+  } catch {
+    return {};
+  }
+};
+
+const writeStore = (store: ProgressStore) => {
+  if (!isBrowser()) return;
+  window.localStorage.setItem(STORAGE_KEY, JSON.stringify(store));
+  window.dispatchEvent(new Event(PROGRESS_UPDATED_EVENT));
+};
+
+const getOrCreateProgress = (store: ProgressStore, userId: string, courseSlug: string) => {
+  if (!store[userId]) {
+    store[userId] = {};
+  }
+  if (!store[userId][courseSlug]) {
+    store[userId][courseSlug] = { ...defaultProgress };
+  }
+  return store[userId][courseSlug];
+};
+
+export const getCourseProgress = (userId: string, courseSlug: string): CourseProgress => {
+  const store = readStore();
+  return store[userId]?.[courseSlug] ?? { ...defaultProgress };
+};
+
+export const getCourseProgressPercent = (
+  userId: string,
+  courseSlug: string,
+  totalLessons: number,
+): number => {
+  if (totalLessons <= 0) return 0;
+  const progress = getCourseProgress(userId, courseSlug);
+  return Math.round((progress.completedLessonIds.length / totalLessons) * 100);
+};
+
+export const setLastLesson = (userId: string, courseSlug: string, lessonId: string) => {
+  const store = readStore();
+  const progress = getOrCreateProgress(store, userId, courseSlug);
+  progress.lastLessonId = lessonId;
+  writeStore(store);
+};
+
+export const markLessonComplete = (userId: string, courseSlug: string, lessonId: string) => {
+  const store = readStore();
+  const progress = getOrCreateProgress(store, userId, courseSlug);
+  if (!progress.completedLessonIds.includes(lessonId)) {
+    progress.completedLessonIds = [...progress.completedLessonIds, lessonId];
+  }
+  progress.lastLessonId = lessonId;
+  writeStore(store);
+};
+
+export const clearCourseProgress = (userId: string, courseSlug: string) => {
+  const store = readStore();
+  if (!store[userId]) return;
+  delete store[userId][courseSlug];
+  writeStore(store);
+};
+
+export const progressUpdatedEventName = PROGRESS_UPDATED_EVENT;