import streamlit as st

# Title of the game
st.title("SUBR Game: Stack Underflow Bug Riddle")

# Introduction
st.write("""
Welcome to the SUBR Game! Your goal is to find the stack underflow bug in the given code snippet.
Solve the riddle and submit your answer to see if you're correct!
""")

# Code snippet with a hidden bug
code_snippet = """
def calculate_sum(numbers):
    total = 0
    for i in range(len(numbers) - 1, -1, -1):
        total += numbers[i]
    return total

numbers = [1, 2, 3, 4, 5]
result = calculate_sum(numbers)
print("The sum is:", result)
"""

st.code(code_snippet, language='python')

# User input for the answer
user_answer = st.text_input("What is the stack underflow bug in the code above?", "")

# Correct answer (hidden)
correct_answer = "The bug is in the loop range; it should be `range(len(numbers) - 1, -1, -1)` to avoid underflow."

# Check the user's answer
if st.button("Submit"):
    if user_answer.strip().lower() == correct_answer.lower():
        st.success("Congratulations! You found the bug!")
    else:
        st.error("Sorry, that's not correct. Try again!")

# Footer
st.write("""
This is a simple example of a SUBR game. You can expand it with more complex code snippets and riddles.
""")