import json
import os

LEADERBOARD_FILE = "leaderboard.json"

def load_leaderboard():
    if not os.path.exists(LEADERBOARD_FILE):
        return []
    with open(LEADERBOARD_FILE, "r", encoding="utf-8") as f:
        return json.load(f)

def save_leaderboard(data):
    with open(LEADERBOARD_FILE, "w", encoding="utf-8") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)

def update_leaderboard(model_name, score):
    leaderboard = load_leaderboard()
    leaderboard = [entry for entry in leaderboard if entry["model"] != model_name]
    leaderboard.append({"model": model_name, "score": score})
    leaderboard.sort(key=lambda x: x["score"], reverse=True)
    save_leaderboard(leaderboard)