// ── มิตซูชัยพร — Astro + Express (static) ─────────────────────────
// Serves the Astro static build (dist/) on the configured port.
// Mirrors the moreminimore-astroreal deployment pattern that works on EasyPanel.
//
// Injects env vars into HTML at serve time (replaces ${PLACEHOLDER}s):
//   GA_ID       — Google Analytics / GTM measurement id (empty = analytics removed)
//   FORM_EMAIL  — FormSubmit recipient for RFQ/contact forms
//   GMAP_EMBED  — full Google Maps embed URL (no-API-key style)
//   PORT        — listen port (default 4321)

import express from 'express';
import { existsSync, readFileSync, statSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const PORT = parseInt(process.env.PORT || '4321', 10);
const DIST = join(__dirname, 'dist');

// Build the Google Map embed (type A — free, no API key)
const GMAP_LAT = process.env.GMAP_LAT || '13.557229094780995';
const GMAP_LNG = process.env.GMAP_LNG || '100.28916297408983';
const GMAP_EMBED =
  process.env.GMAP_EMBED ||
  `https://maps.google.com/maps?q=${GMAP_LAT},${GMAP_LNG}&z=${process.env.GMAP_ZOOM || 16}&output=embed`;
const FORM_EMAIL = process.env.FORM_EMAIL || 'mail@mitsuchaiyaporn.com';
const GA_ID = process.env.GA_ID || '';

const app = express();
app.disable('x-powered-by');

// Inject env placeholders into an HTML string; also remove GA snippet if disabled.
function injectEnv(html) {
  let out = html
    .replaceAll('${GMAP_EMBED}', GMAP_EMBED)
    .replaceAll('${FORM_EMAIL}', FORM_EMAIL);
  if (GA_ID) {
    out = out
      .replaceAll('${GA_ID}', GA_ID);
  } else {
    // GA disabled: strip the gtag snippet + config lines
    out = out
      .replace(/<script[^>]*googletagmanager\.com\/gtag\/js[^>]*><\/script>/g, '')
      .replace(/<script[\s\S]*?window\.dataLayer[\s\S]*?<\/script>/g, '');
  }
  return out;
}

// Serve .html with env injection; everything else statically.
app.use((req, res, next) => {
  let pathname;
  try {
    pathname = decodeURIComponent(req.path);
  } catch {
    return next();
  }
  if (pathname.endsWith('.html') || pathname === '/' || !/\.[a-z0-9]+$/i.test(pathname)) {
    let file = pathname === '/' ? 'index.html' : pathname;
    let abs = join(DIST, file);
    // if it's a directory, serve its index.html
    if (existsSync(abs) && statSync(abs).isDirectory()) {
      abs = join(abs, 'index.html');
    }
    // clean-URL support: /about-us/ => about-us/index.html
    if (!existsSync(abs)) {
      abs = join(DIST, file, 'index.html');
    }
    if (existsSync(abs) && statSync(abs).isFile()) {
      const html = readFileSync(abs, 'utf-8');
      res.setHeader('Content-Type', 'text/html; charset=utf-8');
      return res.send(injectEnv(html));
    }
  }
  next();
});

// Static Astro build (css, js, images) with long cache
app.use(
  express.static(DIST, { maxAge: '1y', etag: true })
);

// 404 fallback
app.use((req, res) => {
  res.status(404).sendFile(join(DIST, '404.html'), (err) => {
    if (err) res.status(404).send('Not found');
  });
});

app.listen(PORT, '0.0.0.0', () => {
  console.log(`[mitsu] Listening on http://0.0.0.0:${PORT}`);
  console.log(`[mitsu] Static: ${existsSync(DIST) ? 'dist/ ✓' : 'dist/ NOT found'}`);
});