## Copyright © 2026 Olaf Kolkman
## SPDX-License-Identifier: GPL-3.0-or-later

from email.message import EmailMessage
from smtplib import SMTP

from backend.app.core.config import settings


def smtp_configured() -> bool:
    return bool(settings.smtp_host and settings.smtp_from)


def send_verification_email(email: str, username: str, verification_url: str) -> None:
    if not smtp_configured():
        raise RuntimeError('SMTP is not configured; set LINKLOG_SMTP_HOST and LINKLOG_SMTP_FROM')

    message = EmailMessage()
    message['Subject'] = 'Verify your LinkLog email address'
    message['From'] = settings.smtp_from
    message['To'] = email
    message.set_content(
        f'Hello {username},\n\n'
        f'Verify your LinkLog email address by opening this link:\n{verification_url}\n\n'
        f'This link expires in {settings.email_verification_expiry_hours} hours.\n'
    )

    with SMTP(settings.smtp_host, settings.smtp_port, timeout=10) as smtp:
        if settings.smtp_use_tls:
            smtp.starttls()
        if settings.smtp_username:
            smtp.login(settings.smtp_username, settings.smtp_password)
        smtp.send_message(message)