"""Operational mail for account links. No dialogue content, no model egress."""
from __future__ import annotations

import logging
import os
import smtplib
from email.message import EmailMessage

from env_loader import env_flag, runtime_env

log = logging.getLogger("kansho.mail")

OUTBOX: list[dict] = []


class MailNotConfigured(RuntimeError):
    """SMTP is required and neither configured nor in the development log path."""


def clear_outbox() -> None:
    OUTBOX.clear()


def smtp_configured() -> bool:
    return bool((os.environ.get("SMTP_HOST") or "").strip() and (os.environ.get("SMTP_FROM") or "").strip())


def send_mail(recipients: list[str], subject: str, body: str) -> None:
    cleaned: list[str] = []
    for item in recipients:
        address = (item or "").strip().lower()
        if address and address not in cleaned:
            cleaned.append(address)
    if not cleaned:
        raise MailNotConfigured("Mailversand ist nicht konfiguriert")
    if env_flag("KANSHO_FAKE_MAIL"):
        OUTBOX.append({"to": cleaned, "subject": subject, "body": body})
        return
    host = (os.environ.get("SMTP_HOST") or "").strip()
    sender = (os.environ.get("SMTP_FROM") or "").strip()
    if not host or not sender:
        if runtime_env() == "development":
            log.warning("Kansho mail (development, SMTP fehlt): %s", body)
            return
        raise MailNotConfigured("Mailversand ist nicht konfiguriert")
    port = int((os.environ.get("SMTP_PORT") or "587").strip() or "587")
    user = (os.environ.get("SMTP_USER") or "").strip()
    password = os.environ.get("SMTP_PASSWORD") or ""
    message = EmailMessage()
    message["Subject"] = subject
    message["From"] = sender
    message["To"] = ", ".join(cleaned)
    message.set_content(body)
    if port == 465:
        with smtplib.SMTP_SSL(host, port, timeout=20) as smtp:
            if user:
                smtp.login(user, password)
            smtp.send_message(message)
        return
    with smtplib.SMTP(host, port, timeout=20) as smtp:
        smtp.starttls()
        if user:
            smtp.login(user, password)
        smtp.send_message(message)