import streamlit as st
import pandas as pd
import os
import datetime

LEADERBOARD_FILE = "leaderboard.csv"

st.title("🏆 Hackathon Leaderboard")

# Upload form
uploaded_file = st.file_uploader("Upload your solution (.py)", type=["py"])

if uploaded_file:
    if st.button("Submit"):
        # Generate unique filename based on timestamp
        timestamp = datetime.datetime.now().isoformat()
        submission_filename = f"{timestamp.replace(':', '_')}_{uploaded_file.name}"
        submission_path = os.path.join("submissions", submission_filename)

        # Ensure submissions folder exists
        os.makedirs("submissions", exist_ok=True)

        # Save uploaded file
        with open(submission_path, "wb") as f:
            f.write(uploaded_file.read())

        # TODO: Add actual evaluation logic here
        score = 42  # Dummy score

        # Create leaderboard entry
        entry = {
            "timestamp": timestamp,
            "score": score,
            "file": submission_filename,
        }

        # Append to leaderboard.csv
        if os.path.exists(LEADERBOARD_FILE):
            df = pd.read_csv(LEADERBOARD_FILE)
            df = pd.concat([df, pd.DataFrame([entry])], ignore_index=True)
        else:
            df = pd.DataFrame([entry])

        df.to_csv(LEADERBOARD_FILE, index=False)
        st.success(f"Submission received! Score: {score}")

# Show leaderboard
if os.path.exists(LEADERBOARD_FILE):
    df = pd.read_csv(LEADERBOARD_FILE)
    df_sorted = df.sort_values(by="score", ascending=False)
    st.subheader("Leaderboard")
    st.dataframe(df_sorted)