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src/services/classroom.js

@@ -493,6 +493,28 @@ export async function getUser(userId) {
  * Removes a user from the classroom (Kick)
  * @param {string} userId 
  */
+/**
+ * Subscribes to a single user's progress for real-time updates
+ * @param {string} userId 
+ * @param {Function} callback (progressMap) => void
+ * @returns {Function} unsubscribe
+ */
+export function subscribeToUserProgress(userId, callback) {
+    const q = query(
+        collection(db, PROGRESS_COLLECTION),
+        where("userId", "==", userId)
+    );
+
+    return onSnapshot(q, (snapshot) => {
+        const progressMap = {};
+        snapshot.forEach(doc => {
+            const data = doc.data();
+            progressMap[data.challengeId] = data;
+        });
+        callback(progressMap);
+    });
+}
+
 export async function removeUser(userId) {
     if (!userId) return;
     await deleteDoc(doc(db, USERS_COLLECTION, userId));