from pathlib import Path
import json,datetime,os

def assert_tuning_open():
 if Path('reports/frozen_selection.json').exists():
  raise RuntimeError('Model selection is frozen and test labels may be open. Use independent new data for further tuning.')
 p=Path(os.environ.get('SETU_BUDGET_FILE','experiments/run_budget.json'))
 if p.exists() and datetime.datetime.now(datetime.timezone.utc)>=datetime.datetime.fromisoformat(json.load(open(p))['deadline_utc']):
  raise RuntimeError('Active research budget has expired. No further training started.')