app.py

import streamlit as st
import pandas as pd
from huggingface_hub import HfApi, hf_hub_download

# Constants
HF_REPO = "giobin/MAIA_human_assessment_annotations"
CSV_FILENAME = "user_selections.csv"

# Function to assign samples to users
def assign_samples(csv_path):
    df = pd.read_csv(csv_path)
    group_1 = df[(df["pool_pos"] == 1) & (~df["question_category"].str.endswith("_B"))].head(5)
    group_2 = df[(df["pool_pos"] == 2) & (~df["question_category"].str.endswith("_B"))].head(5)
    group_3 = df[(df["pool_pos"] == 3) & (~df["question_category"].str.endswith("_B"))].head(5)
    return {
        "Bernardo": group_1,
        "Alessandro": group_1,
        "Alessio": group_1,
        "Lenci": group_2,
        "Lucia": group_2,
        "Davide": group_2,
        "Giovanni": group_3,
        "Raffaella": group_3,
    }

# Function to load existing annotations from Hugging Face Hub
def load_existing_annotations():
    try:
        file_path = hf_hub_download(HF_REPO, CSV_FILENAME, repo_type="dataset", token=st.secrets["HF_TOKEN"])
        return pd.read_csv(file_path)
    except Exception:
        return pd.DataFrame(columns=["username", "id"])

# Load datasets
csv_file = "static/mc.csv"
assignments = assign_samples(csv_file)
existing_annotations = load_existing_annotations()

# Valid users
valid_users = list(assignments.keys())

# Initialize session state variables
if "username" not in st.session_state:
    st.session_state.username = None
if "index" not in st.session_state:
    st.session_state.index = 0
if "results" not in st.session_state:
    st.session_state.results = []

# User selectiontion
def update_name():
    """Set username and reset index."""
    st.session_state.username = st.session_state.selected_user
    st.session_state.index = 0  # Reset progress

if st.session_state.username is None:
    with st.form("user_form"):
        st.write("### Seleziona il tuo nome")
        selected_user = st.selectbox("Nome:", valid_users, key="selected_user")
        submit_button = st.form_submit_button("Inizia il task", on_click=update_name)
    st.stop()

# Retrieve assigned dataset and filter out already labeled samples
full_dataset = assignments[st.session_state.username].reset_index(drop=True)
user_labeled_ids = existing_annotations[existing_annotations["username"] == st.session_state.username]["id"].tolist()
dataset = full_dataset[~full_dataset["id"].isin(user_labeled_ids)].reset_index(drop=True)

# Check if all samples are labeled
if st.session_state.index >= len(dataset):
    st.write("### Ottimo. Hai completato il tuo task! 🎉")
    st.stop()

# Function to push updated annotations to Hugging Face Hub
def push_to_hf_hub(csv_path):
    api = HfApi()
    try:
        api.create_repo(HF_REPO, repo_type="dataset", exist_ok=True, token=st.secrets["HF_TOKEN"])
        api.upload_file(path_or_fileobj=csv_path, path_in_repo=CSV_FILENAME, repo_id=HF_REPO, repo_type="dataset", token=st.secrets["HF_TOKEN"])
        print(f"Dataset updated: https://huggingface.co/datasets/{HF_REPO}")
    except Exception as e:
        print(f"Error pushing to HF: {e}")

# Function to save user choice
def save_choice():
    sample = dataset.iloc[st.session_state.index]
    selected_answer = st.session_state.get("selected_answer", None)
    not_enough_info = st.session_state.get("not_enough_info", False)
    
    if selected_answer is not None:
        st.session_state.results.append({
            "username": st.session_state.username,
            "id": sample["id"],
            "video_id": sample["video_id"],
            "answer1": sample["answer1"],
            "answer2": sample["answer2"],
            "selected_answer": selected_answer,
            "target": sample["target"],
            "not_enough_info": not_enough_info
        })
        st.session_state.index += 1

    # Save results and push to Hugging Face Hub if all samples are labeled
    if st.session_state.index >= len(dataset):
        st.write("### Ottimo. Hai completato il tuo task! 🎉")
        result_df = pd.DataFrame(st.session_state.results)
        csv_path = "user_selections.csv"
        if not existing_annotations.empty:
            result_df = pd.concat([existing_annotations, result_df]).drop_duplicates(subset=["username", "id"], keep="last")
        result_df.to_csv(csv_path, index=False)
        push_to_hf_hub(csv_path)
        st.stop()

# Display current sample
sample = dataset.iloc[st.session_state.index]

# Page title and user information
st.markdown("<h1 style='text-align: center; font-size: 50px;'>MAIA Sample</h1>", unsafe_allow_html=True)
st.markdown(f"<h3 style='text-align: center;'>User: {st.session_state.username}</h3>", unsafe_allow_html=True)
st.write("\n\n")

# Instructions
st.markdown("""
### Istruzioni:
- Osserva attentamente il frame del video (senza premere play) e cerca di capire il contesto della scena
- Valuta le opzioni (A e B) e seleziona quella che ritieni più attinente al video.
- Se il frame non contiene tutte le informazioni necessarie per decidere con certezza l’alternativa, seleziona il checkbox sottostante. 
- Clicca 'Continua' per procedere.
""")
st.write("---")

# Display video thumbnail
st.video(sample["video_url"])

# Form for user input
with st.form("annotation_form"):
    # Exclusive choice between A and B
    selected_answer = st.radio(
        "Choose the correct description:",
        options=[0, 1],
        index=None,
        format_func=lambda x: f"A: {sample['answer1']}" if x == 0 else f"B: {sample['answer2']}",
        key="selected_answer"
    )

    # Independent checkbox for insufficient information
    not_enough_info = st.checkbox("Il frame non contiene abbastanza informazioni per scegliere con sicurezza", key="not_enough_info")

    # Submit button
    submit_button = st.form_submit_button("Continua", on_click=save_choice)