src/streamlit_app.py

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

from google_sheet import *

st.title("🏆 Hackathon Leaderboard")

# ========================
# Submission Form
# ========================

uploaded_file = st.file_uploader("Upload your model/class (.pkl)", type=["pkl"])

def is_valid_model(obj):
    """
    Check if the object is a class instance with a 'predict' method.
    """
    return hasattr(obj, 'get_team') and inspect.ismethod(getattr(obj, 'get_team', None)) or callable(getattr(obj, 'get_team', None))

if uploaded_file and st.button("Submit"):
    timestamp = datetime.datetime.now().isoformat()
    submission_filename = f"{timestamp.replace(':', '_')}_{uploaded_file.name}"
    submission_path = os.path.join("submissions", submission_filename)
    os.makedirs("submissions", exist_ok=True)

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

    team = "fail"

    # Load and evaluate model
    try:
        with open(submission_path, "rb") as f:
            model = pickle.load(f)

        if is_valid_model(model):
            team = model.get_team()
            score = 100  # Example valid score
            st.success("Valid model uploaded. ✅")
        else:
            team = "fail"
            score = 0
            st.error("Uploaded object does not implement a `predict` method. ❌")

    except Exception as e:
        score = 0
        st.error(f"Failed to load or validate pickle file: {e}")

    # Append result to leaderboard
    append_score(timestamp, score, submission_filename)
    st.success(f"Submission received! Score: {score}; Team {team}")

# ========================
# Always Show Leaderboard
# ========================
st.subheader("Leaderboard")

try:
    df = fetch_leaderboard()
    if not df.empty:
        df_sorted = df.sort_values(by="score", ascending=False)
        st.dataframe(df_sorted)
    else:
        st.info("No submissions yet.")
except Exception as e:
    st.warning(f"Could not load leaderboard: {e}")