"""Async E-Mail-Versand via SMTP."""
import logging
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

import aiosmtplib

from config import (
    SMTP_HOST,
    SMTP_PORT,
    SMTP_USER,
    SMTP_PASSWORD,
    SMTP_FROM_EMAIL,
    SMTP_FROM_NAME,
    SMTP_USE_TLS,
)

logger = logging.getLogger("verwaltung.email")


async def send_email(to_email: str, subject: str, html_body: str) -> bool:
    """Sendet eine HTML-E-Mail.

    Returns:
        True bei Erfolg, False bei Fehler.
    """
    if not SMTP_HOST:
        logger.warning(f"SMTP nicht konfiguriert - E-Mail an {to_email} nicht gesendet: {subject}")
        return False

    msg = MIMEMultipart("alternative")
    msg["From"] = f"{SMTP_FROM_NAME} <{SMTP_FROM_EMAIL}>"
    msg["To"] = to_email
    msg["Subject"] = subject

    text_content = f"Betreff: {subject}\n\nBitte oeffnen Sie diese E-Mail in einem HTML-faehigen E-Mail-Client."
    msg.attach(MIMEText(text_content, "plain", "utf-8"))
    msg.attach(MIMEText(html_body, "html", "utf-8"))

    try:
        await aiosmtplib.send(
            msg,
            hostname=SMTP_HOST,
            port=SMTP_PORT,
            username=SMTP_USER if SMTP_USER else None,
            password=SMTP_PASSWORD if SMTP_PASSWORD else None,
            start_tls=SMTP_USE_TLS,
        )
        logger.info(f"E-Mail gesendet an {to_email}: {subject}")
        return True
    except Exception as e:
        logger.error(f"E-Mail-Versand fehlgeschlagen an {to_email}: {e}")
        return False