import logging
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

from app.config import settings

logger = logging.getLogger(__name__)


def _send_smtp(to_email: str, subject: str, body: str) -> None:
    if not settings.smtp_host:
        logger.warning(
            "SMTP not configured. Email to %s — subject: %s\n%s",
            to_email,
            subject,
            body,
        )
        return

    msg = MIMEMultipart("alternative")
    msg["Subject"] = subject
    msg["From"] = settings.smtp_from or settings.smtp_user
    msg["To"] = to_email
    msg.attach(MIMEText(body, "plain", "utf-8"))

    with smtplib.SMTP(settings.smtp_host, settings.smtp_port) as server:
        if settings.smtp_use_tls:
            server.starttls()
        if settings.smtp_user and settings.smtp_password:
            server.login(settings.smtp_user, settings.smtp_password)
        server.sendmail(msg["From"], [to_email], msg.as_string())


def send_activation_email(to_email: str, username: str, code: str) -> None:
    activate_url = f"{settings.frontend_url.rstrip('/')}/activate"
    body = (
        f"Hello {username},\n\n"
        f"Thank you for registering at Document Template Editor.\n\n"
        f"Your activation code: {code}\n\n"
        f"Enter this code at: {activate_url}\n\n"
        f"The code expires in {settings.activation_code_expire_hours} hours.\n"
    )
    _send_smtp(to_email, "Activate your account", body)


def send_password_reset_email(to_email: str, username: str, code: str) -> None:
    reset_url = f"{settings.frontend_url.rstrip('/')}/reset-password"
    body = (
        f"Hello {username},\n\n"
        f"You requested a password reset.\n\n"
        f"Your reset code: {code}\n\n"
        f"Enter this code at: {reset_url}\n\n"
        f"The code expires in {settings.password_reset_code_expire_hours} hours.\n\n"
        f"If you did not request this, ignore this email.\n"
    )
    _send_smtp(to_email, "Password reset code", body)