"""Email client for sending files via Gmail SMTP."""

from __future__ import annotations

import logging
import smtplib
from email import encoders
from email.mime.base import MIMEBase
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from pathlib import Path

log = logging.getLogger(__name__)


class EmailClient:
    """Send emails with attachments via SMTP_SSL (Gmail app-password friendly)."""

    def __init__(self, smtp_host: str, smtp_port: int, username: str, password: str):
        self.smtp_host = smtp_host
        self.smtp_port = smtp_port
        self.username = username
        self.password = password

    def send(
        self,
        to: str,
        subject: str,
        body: str,
        attachments: list[Path] | None = None,
    ) -> None:
        """Send an email, optionally with file attachments.

        Raises smtplib.SMTPException on failure.
        """
        msg = MIMEMultipart()
        msg["From"] = self.username
        msg["To"] = to
        msg["Subject"] = subject
        msg.attach(MIMEText(body, "plain"))

        for file_path in attachments or []:
            part = MIMEBase("application", "octet-stream")
            part.set_payload(file_path.read_bytes())
            encoders.encode_base64(part)
            part.add_header(
                "Content-Disposition",
                f"attachment; filename={file_path.name}",
            )
            msg.attach(part)

        log.info("Sending email to %s — subject: %s", to, subject)
        with smtplib.SMTP_SSL(self.smtp_host, self.smtp_port) as server:
            server.login(self.username, self.password)
            server.send_message(msg)
        log.info("Email sent successfully to %s", to)