const nodemailer = require('nodemailer');

function createTransport() {
  return nodemailer.createTransport({
    host: process.env.MAIL_RELAY_HOST,
    port: Number(process.env.MAIL_RELAY_PORT || 587),
    secure: false,
    // mail-infra(postfix-relay)はプライベートIP直結・STARTTLS無効構成
    // (apps/xwiki構築時と同じ設定、project_xwiki_oidc_lineworks_sso参照)
    ignoreTLS: true,
  });
}

async function sendAlert({ subject, text }) {
  const to = (process.env.NOTIFY_EMAILS || '')
    .split(',')
    .map((s) => s.trim())
    .filter(Boolean);

  if (to.length === 0) {
    console.warn('NOTIFY_EMAILS未設定のため通知をスキップしました:', subject);
    return;
  }

  const transport = createTransport();
  await transport.sendMail({
    from: process.env.MAIL_FROM || 'keycloak-monitor@next-hd.co.jp',
    to,
    subject,
    text,
  });
}

module.exports = { sendAlert };