// 1. This file should contain backend API documentation
// TODO: Import Flask and PyMongo (line 1-2)
from flask import Flask, session, redirect, url_for, request, jsonify
from flask_pymongo import PyMongo

// TODO: Connect to MongoDB database (line 4-6)
app = Flask(__name__)
app.config['MONGO_URI'] = 'mongodb://localhost:27017/student_db'
mongo = PyMongo(app)

// TODO: Define API endpoint for getting questions (line 8-10)
@app.route('/get_question')
def get_question():
    question_num = session.get('current_question', 0)
    question = mongo.db.questions.find_one({"question_number": question_num})
    
    if question:
        return jsonify({
            "question": question['question'],
            "options": question['options'],
            "question_number": question_num,
            "current_prize": calculate_prize(question_num)
        })
    else:
        return jsonify({"game_over": True, "final_score": calculate_final_score()})

// TODO: Define API endpoint for submitting answers (line 12-14)
@app.route('/answer', methods=['POST'])
def answer_question():
    user_answer = request.json.get('answer')
    question_num = session.get('current_question', 0)
    current_question = mongo.db.questions.find_one({"question_number": question_num})
    
    is_correct = current_question['options'][current_question['correct_answer']] == user_answer
    
    if is_correct:
        session['current_question'] = question_num + 1
        return jsonify({
            "correct": True,
            "correct_answer": current_question['correct_answer'],
            "game_over": question_num + 1 >= TOTAL_QUESTIONS
        })
    else:
        return jsonify({
            "correct": False,
            "correct_answer": current_question['correct_answer'],
            "game_over": True
        })

// TODO: Add error handling for database connection (line 16-18)
try:
    mongo.db.command("ping")
    print("Successfully connected to MongoDB!")
except Exception as e:
    print(f"MongoDB connection error: {e}")