import requests
import json
import os

def run_cf_sync():
    # 1. Fetch data from Codeforces
    c_resp = requests.get("https://codeforces.com/api/contest.list?gym=false")
    contests = [c for c in c_resp.json()['result'] if c.get('phase') == "FINISHED"]
    
    # 2. Logic to group/process (Simplified for example)
    output_filename = "cf_contests.json"
    with open(output_filename, "w") as f:
        json.dump(contests[:50], f) # Limit for speed
    
    # 3. Return the absolute path so Gradio can find the file
    return os.path.abspath(output_filename)