Update app.py

app.py

@@ -1,14 +1,12 @@
 import streamlit as st
 import requests
 import json
-from datetime import datetime
 
 # ==========================
 # Firebase Realtime Database
 # ==========================
-FIREBASE_URL = "https://smartedu-3d5bf-default-rtdb.asia-southeast1.firebasedatabase.app"  # adjust if needed
+FIREBASE_URL = "https://smartedu-3d5bf-default-rtdb.asia-southeast1.firebasedatabase.app"
 
-# --------------------------
 def write_student_info(student_id, name, classroom):
     url = f"{FIREBASE_URL}/{student_id}.json"
     data = {
@@ -17,12 +15,10 @@ def write_student_info(student_id, name, classroom):
     }
     requests.patch(url, json=data)
 
-
 def write_quiz_score(student_id, quiz_name, score):
     url = f"{FIREBASE_URL}/{student_id}/{quiz_name}.json"
     requests.put(url, json=score)
 
-
 def get_student_data(student_id):
     url = f"{FIREBASE_URL}/{student_id}.json"
     res = requests.get(url)
@@ -55,7 +51,6 @@ if role == "Master":
             correct_answer = st.text_input("Đáp án đúng")
 
             if st.button("Lưu Quiz"):
-                # Store quiz definitions in firebase
                 url = f"{FIREBASE_URL}/quiz_definitions/{quiz_name}.json"
                 requests.put(url, json={
                     "question": question,
@@ -81,19 +76,16 @@ if role == "Học sinh":
         else:
             st.error("Vui lòng nhập đầy đủ thông tin!")
 
-    # Load quiz definitions
     st.subheader("Làm Quiz")
     res = requests.get(f"{FIREBASE_URL}/quiz_definitions.json")
     quizzes = res.json() if res.status_code == 200 else {}
 
-    if student_id:
-        student_data = get_student_data(student_id)
+    student_data = get_student_data(student_id) if student_id else {}
 
     if quizzes:
         for quiz_name, content in quizzes.items():
             st.markdown(f"### {quiz_name}")
 
-            # Check if student already completed
             if student_data and quiz_name in student_data:
                 st.info(f"Bạn đã làm Quiz này rồi. Điểm: {student_data[quiz_name]}")
                 continue
@@ -106,6 +98,7 @@ if role == "Học sinh":
                     score = "10/10"
                 else:
                     score = "0/10"
+
                 write_quiz_score(student_id, quiz_name, score)
                 st.success(f"Đã nộp! Điểm: {score}")
     else: