import sqlite3
from datetime import datetime, timedelta
from pathlib import Path
from app.shared.config import Settings


def purge_old_clips(today: str, settings: Settings, db: sqlite3.Connection) -> None:
    cutoff = datetime.strptime(today, "%Y-%m-%d") - timedelta(days=settings.clip_retention_days)
    clips_root = Path(settings.clips_dir)
    if not clips_root.exists():
        return
    for date_dir in clips_root.iterdir():
        if not date_dir.is_dir():
            continue
        try:
            dir_date = datetime.strptime(date_dir.name, "%Y-%m-%d")
        except ValueError:
            continue
        if dir_date < cutoff:
            for wav in date_dir.glob("*.wav"):
                wav.unlink()
            try:
                date_dir.rmdir()
            except OSError:
                pass
    cutoff_str = cutoff.strftime("%Y-%m-%d")
    db.execute(
        "UPDATE utterances SET audio_clip_path=NULL WHERE date(start_time) < ?",
        (cutoff_str,),
    )
    db.commit()