"""
Minimal SMTP sender for the rates app.

Reuses the stack's shared SMTP integration (managed once in the Settings
app, same as the tasks app's mailer) via central_settings — no per-app mail
secrets. Fire-and-forget: a mail failure must never break the scheduler.
"""
import logging
import os
import smtplib
from email.message import EmailMessage

from services.central_settings import get_integration_sync

logger = logging.getLogger(__name__)

HOTEL_NAME = os.getenv("VITE_HOTEL_NAME", "Hotel")


def send_mail(to: str, subject: str, body: str) -> bool:
    """Send a plain-text email through the central SMTP integration.
    Returns True on success. Never raises — logs and returns False instead."""
    if not to:
        return False
    cfg = get_integration_sync("smtp")
    if not cfg or not cfg.get("host"):
        logger.warning("SMTP not configured in central settings — email skipped")
        return False

    try:
        msg = EmailMessage()
        msg["From"] = cfg.get("from") or f"{HOTEL_NAME} Rates <noreply@localhost>"
        msg["To"] = to
        msg["Subject"] = subject
        if cfg.get("reply_to"):
            msg["Reply-To"] = cfg["reply_to"]
        msg.set_content(body)

        port = int(cfg.get("port") or 587)
        with smtplib.SMTP(cfg["host"], port, timeout=15) as s:
            if port != 465:
                try:
                    s.starttls()
                except smtplib.SMTPException:
                    pass  # server without STARTTLS (e.g. local relay)
            if cfg.get("user"):
                s.login(cfg["user"], cfg.get("pass") or "")
            s.send_message(msg)
        return True
    except Exception as e:
        logger.error(f"Email send failed: {e}")
        return False