"""SMTP mailer using the standard library, run off the event loop. Configured
entirely from settings (host/port/credentials/from)."""

import asyncio
import smtplib
from email.message import EmailMessage

from app.core.config import Settings
from app.integrations.mailer.base import Mailer


class SMTPMailer(Mailer):
    def __init__(self, settings: Settings) -> None:
        self.settings = settings

    def _send(self, *, to: str, subject: str, body: str) -> None:
        msg = EmailMessage()
        msg["From"] = self.settings.smtp_from
        msg["To"] = to
        msg["Subject"] = subject
        msg.set_content(body)
        with smtplib.SMTP(self.settings.smtp_host, self.settings.smtp_port) as smtp:
            smtp.starttls()
            if self.settings.smtp_username and self.settings.smtp_password:
                smtp.login(self.settings.smtp_username, self.settings.smtp_password)
            smtp.send_message(msg)

    async def _send_async(self, *, to: str, subject: str, body: str) -> None:
        await asyncio.to_thread(self._send, to=to, subject=subject, body=body)

    async def send_email_verification(self, *, to: str, link: str) -> None:
        await self._send_async(
            to=to,
            subject="Verify your Provenance email",
            body=f"Confirm your email address:\n\n{link}\n",
        )

    async def send_password_reset(self, *, to: str, link: str) -> None:
        await self._send_async(
            to=to,
            subject="Reset your Provenance password",
            body=f"Reset your password:\n\n{link}\n",
        )