# api/notify.py
import os, smtplib
from email.mime.text import MIMEText
from email.utils import formataddr
from dotenv import load_dotenv

# Load .env before reading anything
load_dotenv(os.getenv("ENV_FILE", ".env"))

_TRUES = {"1", "true", "yes", "on"}

def _b(s: str | None, default=False) -> bool:
    if s is None:
        return default
    return str(s).strip().lower() in _TRUES

def _first(*names: str, default: str | None = None) -> str | None:
    for n in names:
        v = os.getenv(n)
        if v is not None and str(v).strip() != "":
            return v
    return default

def _cfg():
    """Merge MAIL_* and SMTP_* envs; MAIL_* wins if both present."""
    enabled = _b(_first("MAIL_ENABLED"), default=False)
    host    = _first("MAIL_HOST", "SMTP_HOST")
    port    = int(_first("MAIL_PORT", "SMTP_PORT", default="0") or "0")
    user    = _first("MAIL_USER", "SMTP_USER")
    pwd     = _first("MAIL_PASSWORD", "SMTP_PASS")
    mail_from = _first("MAIL_FROM", default=user)
    mail_to   = _first("MAIL_TO_DEFAULT", "MAIL_TO")
    tls     = _b(_first("MAIL_TLS"), default=False)
    return {
        "enabled": enabled,
        "host": host, "port": port, "user": user, "pwd": pwd,
        "from": mail_from, "to": mail_to, "tls": tls
    }

def send_email(subject: str, body_text: str, to_addr: str | None = None):
    cfg = _cfg()
    if not cfg["enabled"]:
        print("[notify] MAIL_ENABLED is not true; skipping email")
        return

    host, port, user, pwd = cfg["host"], cfg["port"], cfg["user"], cfg["pwd"]
    mail_from = cfg["from"]
    mail_to   = to_addr or cfg["to"]

    if not (host and port and user and pwd and mail_to):
        print("[notify] missing SMTP config; skipping email")
        return

    msg = MIMEText(body_text, "plain", "utf-8")
    msg["Subject"] = subject
    msg["From"] = formataddr(("Intesa Logs Agent", mail_from))
    msg["To"] = mail_to

    with smtplib.SMTP(host, port, timeout=20) as s:
        if cfg["tls"]:
            try:
                s.starttls()
            except smtplib.SMTPException:
                pass
        s.login(user, pwd)
        s.send_message(msg)
    print(f"[notify] sent email to {mail_to}")