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src/services/classroom.js

@@ -342,6 +342,7 @@ export async function getPeerPrompts(roomCode, challengeId) {
  * @param {string} challengeId 
  */
 export async function resetProgress(userId, roomCode, challengeId) {
+    console.log(`[resetProgress] Attempting reset for User: ${userId}, Challenge: ${challengeId}, Room: ${roomCode}`);
     const progressRef = collection(db, PROGRESS_COLLECTION);
     const q = query(
         progressRef,
@@ -350,12 +351,19 @@ export async function resetProgress(userId, roomCode, challengeId) {
     );
     const snapshot = await getDocs(q);
 
+    console.log(`[resetProgress] Found ${snapshot.size} documents.`);
+
     if (!snapshot.empty) {
         // Reset status to 'started' so they can submit again
         await updateDoc(snapshot.docs[0].ref, {
             status: 'started',
             timestamp: serverTimestamp()
         });
+        console.log(`[resetProgress] Document updated successfully.`);
+        return true;
+    } else {
+        console.warn(`[resetProgress] No progress document found to reset!`);
+        return false;
     }
 }
 

src/views/InstructorView.js

@@ -605,16 +605,24 @@ export function setupInstructorEvents() {
             const challengeId = modal.dataset.challengeId;
             const roomCode = localStorage.getItem('vibecoding_room_code');
 
-            console.log('Reject attempt:', { userId, challengeId, roomCode });
+            console.log('Reject attempt - Click details:', { dataset: modal.dataset, userId, challengeId, roomCode });
 
-            if (!userId || !challengeId) return;
+            if (!userId || !challengeId) {
+                console.error('Missing userId or challengeId');
+                return;
+            }
 
             if (confirm('確定要退回此學員的進度嗎？學員將需要重新作答。')) {
                 try {
                     const { resetProgress } = await import("../services/classroom.js");
-                    await resetProgress(userId, roomCode, challengeId);
-                    alert('已成功退回，學員將需要重新作答。');
-                    window.closeBroadcastModal();
+                    const success = await resetProgress(userId, roomCode, challengeId);
+
+                    if (success) {
+                        alert('已成功退回，學員將需要重新作答。');
+                        window.closeBroadcastModal();
+                    } else {
+                        alert('找不到該學員的進度紀錄，無法退回 (Document Not Found)。');
+                    }
                 } catch (e) {
                     console.error("Reject failed:", e);
                     alert('退回失敗: ' + e.message);