"""Mail delivery via a configured SMTP relay (host/port/credentials in config.json)."""
import smtplib
from email.mime.text import MIMEText


def send_mail(to_addr: str, subject: str, body: str, from_addr: str, smtp_cfg: dict):
    host = smtp_cfg.get("host")
    if not host:
        raise RuntimeError("Aucun serveur SMTP configuré (smtp.host manquant dans config.json).")
    port = int(smtp_cfg.get("port", 587))
    user = smtp_cfg.get("user")
    password = smtp_cfg.get("password")
    use_tls = smtp_cfg.get("use_tls", True)

    msg = MIMEText(body)
    msg["Subject"] = subject
    msg["From"] = from_addr
    msg["To"] = to_addr

    with smtplib.SMTP(host, port, timeout=10) as smtp:
        if use_tls:
            smtp.starttls()
        if user:
            smtp.login(user, password)
        smtp.send_message(msg)