data/loader.py

import json
from typing import Optional, Dict, Any, List, Tuple


def load_simulation_data(file) -> Tuple[Optional[List[Dict[str, Any]]], Optional[List[str]]]:
    if file is None:
        return None, None

    try:
        json_data = json.load(open(file.name))
        simulations = json_data['simulations']

        descriptions = [
            f"Simulation {i}: {len(sim['subjects'])} subjects, {len(sim['instructions'])} instructions"
            for i, sim in enumerate(simulations)
        ]

        return simulations, descriptions
    except Exception as e:
        print(f"Error loading simulation data: {str(e)}")
        return None, None