from __future__ import annotations

import os
from email.message import EmailMessage

import aiosmtplib


class SmtpWelcomeEmailSender:
    def __init__(self) -> None:
        self._host = os.getenv("SMTP_HOST", "localhost")
        self._port = int(os.getenv("SMTP_PORT", "1025"))
        self._username = os.getenv("SMTP_USERNAME")
        self._password = os.getenv("SMTP_PASSWORD")
        self._from_email = os.getenv("SMTP_FROM_EMAIL", "noreply@example.com")
        self._use_tls = os.getenv("SMTP_USE_TLS", "false").lower() == "true"

    async def send_welcome(self, *, to_email: str, full_name: str) -> None:
        msg = EmailMessage()
        msg["From"] = self._from_email
        msg["To"] = to_email
        msg["Subject"] = "Welcome!"
        msg.set_content(f"Hi, {full_name}! Welcome to our service.")

        await aiosmtplib.send(
            msg,
            hostname=self._host,
            port=self._port,
            username=self._username,
            password=self._password,
            start_tls=self._use_tls,
        )