"""Email alerts via Gmail SMTP + app password — the same pattern already
used by lunch-notifier on this box, reused here rather than adding a new
notification service. Silently a no-op if GMAIL_USER/GMAIL_APP_PASSWORD
aren't set, so the alert feature is opt-in.
"""
import logging
import os
import smtplib
from email.mime.text import MIMEText

logger = logging.getLogger("massprice.notify")

GMAIL_USER = os.environ.get("GMAIL_USER")
GMAIL_APP_PASSWORD = os.environ.get("GMAIL_APP_PASSWORD")
ALERT_EMAIL = os.environ.get("ALERT_EMAIL") or GMAIL_USER


def send_alert(subject, body):
    """Best-effort: logs and returns False on any failure rather than
    raising, since a broken alert channel shouldn't break automation."""
    if not GMAIL_USER or not GMAIL_APP_PASSWORD or not ALERT_EMAIL:
        return False
    msg = MIMEText(body)
    msg["Subject"] = subject
    msg["From"] = GMAIL_USER
    msg["To"] = ALERT_EMAIL
    try:
        with smtplib.SMTP_SSL("smtp.gmail.com", 465) as server:
            server.login(GMAIL_USER, GMAIL_APP_PASSWORD)
            server.sendmail(GMAIL_USER, [ALERT_EMAIL], msg.as_string())
        return True
    except Exception:
        logger.exception("Failed to send alert email")
        return False