import config from "../config.js";
import * as nodemailer from "nodemailer";

import type SMTPTransport from "nodemailer/lib/smtp-transport";

export interface EmailMessage {
  to: string | string[];
  subject: string;
  text?: string;
  html?: string;
}

async function createTransporter() {
  const transporter = nodemailer.createTransport({
    host: config.emergency.mail.host,
    port: config.emergency.mail.port,
    secure: config.emergency.mail.secure,
    auth: {
      user: config.emergency.mail.user,
      pass: config.emergency.mail.password,
    },
  } as SMTPTransport.Options);

  // 接続テスト
  try {
    await transporter.verify();
    console.log("SMTPサーバーに接続できました");
  } catch (error) {
    console.error("SMTP接続テストに失敗:", error);
    throw error;
  }

  return transporter;
}

export default async function sendMail(message: EmailMessage): Promise<void> {
  try {
    const transporter = await createTransporter();

    await transporter.sendMail({
      from: config.emergency.mail.user,
      to: Array.isArray(message.to) ? message.to.join(",") : message.to,
      subject: message.subject,
      text: message.text,
      html: message.html,
    });
    console.log("メール送信成功");
  } catch (error) {
    console.error("メール送信に失敗しました:", error);
    throw error;
  }
}