#!/usr/bin/env node
'use strict';
// alert.js — send one alert email, reusing the server's own SMTP settings.
//
// Exists because backup-to-drive.sh used to report failure only into
// ~/Library/Logs/checklist-drive-backup.log, where nobody was ever going to look. That is
// how the Drive copies went ten weeks stale in July 2026, and then — despite the script
// written to prevent exactly that — another nine days in September 2026.
//
// Usage:  node scripts/alert.js "<subject>" "<body>"
// Exit 0 if the mail went out, 1 otherwise. Callers should NOT fail on a failed alert:
// the thing being reported matters more than the reporting of it.

const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
const ENV_FILE = path.join(ROOT, 'server', '.env');

// Minimal .env reader — the server uses dotenv, but this script has to run from a plain
// LaunchAgent with no cwd guarantees and no node_modules of its own.
function readEnv(file) {
  const out = {};
  let text;
  try { text = fs.readFileSync(file, 'utf8'); }
  catch { return out; }
  for (const raw of text.split('\n')) {
    const line = raw.trim();
    if (!line || line.startsWith('#')) continue;
    const eq = line.indexOf('=');
    if (eq < 0) continue;
    let v = line.slice(eq + 1).trim();
    if ((v.startsWith('"') && v.endsWith('"')) || (v.startsWith("'") && v.endsWith("'"))) v = v.slice(1, -1);
    out[line.slice(0, eq).trim()] = v;
  }
  return out;
}

async function main() {
  const subject = process.argv[2];
  const body = process.argv[3] || '';
  if (!subject) { console.error('alert.js: no subject given'); process.exit(1); }

  const env = readEnv(ENV_FILE);
  const to = env.REPORT_EMAIL;
  if (!to) { console.error(`alert.js: no REPORT_EMAIL in ${ENV_FILE}`); process.exit(1); }
  if (!env.SMTP_HOST || !env.SMTP_USER || !env.SMTP_PASS) {
    console.error(`alert.js: SMTP is not configured in ${ENV_FILE}`); process.exit(1);
  }

  // nodemailer lives in server/node_modules; this script has none of its own.
  let nodemailer;
  try { nodemailer = require(path.join(ROOT, 'server', 'node_modules', 'nodemailer')); }
  catch { console.error('alert.js: nodemailer not installed — run `npm install` in server/'); process.exit(1); }

  const transport = nodemailer.createTransport({
    host: env.SMTP_HOST,
    port: Number(env.SMTP_PORT || 587),
    secure: String(env.SMTP_SECURE || 'false') === 'true',
    auth: { user: env.SMTP_USER, pass: env.SMTP_PASS },
  });

  await transport.sendMail({
    from: env.SMTP_FROM || env.SMTP_USER,
    to,
    subject,
    text: `${body}\n\n-- \nSent by scripts/alert.js on ${require('os').hostname()} at ${new Date().toISOString()}\n`,
  });
  console.log(`alert.js: sent "${subject}" to ${to}`);
}

main().catch(err => { console.error('alert.js:', err && err.message ? err.message : err); process.exit(1); });