# engine/utils/time_utils.py

from datetime import datetime, timezone, timedelta
import pytz

LOCAL_TZ = pytz.timezone("America/Toronto")

def utc_ts_to_local_datetime(ts: float):
    """Timestamp UNIX (UTC réel) → datetime locale America/Toronto."""
    return datetime.fromtimestamp(ts, timezone.utc).astimezone(LOCAL_TZ)

def utc_ts_to_utc_datetime(ts: float):
    """Timestamp UNIX (UTC réel) → datetime UTC."""
    return datetime.fromtimestamp(ts, timezone.utc)

def local_datetime_to_utc(dt):
    """Datetime locale → UTC."""
    if dt is None:
        return None
    return dt.astimezone(timezone.utc)