'use strict';

/**
 * Process entry for the standalone automail server.
 *
 * Division of labour (same split genEngine used):
 *   server.js  → env + Mongo connection + HTTP server + dashboard   (THIS FILE)
 *   index.js   → the automail module: mounts routes, seeds scenarios,
 *                starts the poller. Owns NO connection by design.
 *
 * So all we do here is: connect Mongo, build the app, then hand it to
 * automail.register() — which must run AFTER the connection is live.
 */

require('dotenv').config();

const path = require('path');
const express = require('express');
const cors = require('cors');
const mongoose = require('mongoose');

const automail = require('./index');   // <-- your existing module (register/startPoller/stopPoller)

const PORT = process.env.PORT || 1000;
const MONGO_URI = process.env.MONGO_URI;

async function start() {
  if (!MONGO_URI) {
    console.error('[server] MONGO_URI missing in .env — cannot start.');
    process.exit(1);
  }

  // 1. Connection first — the module assumes it already exists.
  await mongoose.connect(MONGO_URI);
  console.log('[server] Mongo connected');

  // 2. Build the host app + middleware the module relies on.
  const app = express();
  app.use(cors());                                          // client's own app calls cross-origin
  app.use(express.json());                                  // routes read req.body (approve/edit/settings)
  app.use(express.static(path.join(__dirname, 'public')));  // dashboard at /
  app.get('/health', (_req, res) => res.json({ ok: true, uptime: process.uptime() }));

  // 3. Hand the app to automail — mounts /automail, seeds scenarios, starts poller.
  await automail.register(app);   // basePath defaults to /automail; poller starts unless startPoller:false

  // 4. Now that all routes are mounted, listen.
  app.listen(PORT, () => {
    console.log(`[server] server    http://localhost:${PORT}`);
    console.log(`[server] dashboard http://localhost:${PORT}/`);
    console.log(`[server] api       http://localhost:${PORT}/automail`);
  });
}

// Clean poller shutdown on Ctrl+C.
process.on('SIGINT', () => {
  try { automail.stopPoller && automail.stopPoller(); } catch {}
  mongoose.connection.close().finally(() => process.exit(0));
});

start().catch((err) => {
  console.error('[server] failed to start —', err);
  process.exit(1);
});