"""Email notification provider."""

from __future__ import annotations

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

from notifications.base import LoggingNotificationService

logger = logging.getLogger(__name__)


class EmailNotificationService(LoggingNotificationService):
    """
    Email notification service.

    Uses SMTP credentials from environment variables when configured.
    Falls back to logging when SMTP is not set up.
    """

    def __init__(self) -> None:
        self.smtp_host = os.environ.get("SMTP_HOST", "")
        self.smtp_port = int(os.environ.get("SMTP_PORT", "587"))
        self.smtp_user = os.environ.get("SMTP_USER", "")
        self.smtp_password = os.environ.get("SMTP_PASSWORD", "")
        self.email_from = os.environ.get("EMAIL_FROM", "")
        self.email_to = os.environ.get("EMAIL_TO", "")
        self.use_tls = os.environ.get("SMTP_USE_TLS", "true").lower() == "true"

    def _smtp_configured(self) -> bool:
        return all([self.smtp_host, self.smtp_user, self.smtp_password, self.email_from, self.email_to])

    def send_email(self, subject: str, body: str) -> bool:
        if not self._smtp_configured():
            return super().send_email(subject, body)

        try:
            msg = MIMEMultipart()
            msg["From"] = self.email_from
            msg["To"] = self.email_to
            msg["Subject"] = subject
            msg.attach(MIMEText(body, "plain"))

            with smtplib.SMTP(self.smtp_host, self.smtp_port, timeout=30) as server:
                if self.use_tls:
                    server.starttls()
                server.login(self.smtp_user, self.smtp_password)
                server.sendmail(self.email_from, [self.email_to], msg.as_string())

            logger.info("Email sent to %s", self.email_to)
            return True
        except Exception as exc:
            logger.error("Failed to send email: %s", exc)
            return False