/**
 * ============================================================
 * SVGarden — https://www.svgarden.dev
 * Author : Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 * File   : server.mjs
 * Desc   : Tiny Express static server for dist/ on 127.0.0.1:4321 (+ /healthz)
 * ============================================================
 */
import { readFileSync, existsSync } from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import express from 'express';
import compression from 'compression';

const ROOT = path.dirname(fileURLToPath(import.meta.url));
const DIST = path.join(ROOT, 'dist');
const PORT = Number(process.env.PORT ?? 4321);
const HOST = process.env.HOST ?? '127.0.0.1';

if (!existsSync(DIST)) {
  console.error('server.mjs: dist/ not found — run `npm run build` first.');
  process.exit(1);
}

const buildInfoPath = path.join(DIST, 'build-info.json');
const buildInfo = existsSync(buildInfoPath)
  ? JSON.parse(readFileSync(buildInfoPath, 'utf8'))
  : { built: null, snippets: null };

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

app.get('/healthz', (_req, res) => {
  res.set('Cache-Control', 'no-store');
  res.json({ status: 'ok', built: buildInfo.built, snippets: buildInfo.snippets });
});

app.use(
  express.static(DIST, {
    extensions: ['html'],
    setHeaders(res, filePath) {
      if (/\.(?:js|css|woff2?|svg|png|jpe?g|webp|avif)$/.test(filePath) && /_astro[\\/]/.test(filePath)) {
        // Astro emits content-hashed filenames under _astro/ — safe to cache forever
        res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');
      } else if (filePath.endsWith('.html') || filePath.endsWith('.json')) {
        res.setHeader('Cache-Control', 'no-cache');
      } else {
        res.setHeader('Cache-Control', 'public, max-age=3600');
      }
    },
  })
);

app.use((_req, res) => {
  res.status(404);
  const notFound = path.join(DIST, '404.html');
  if (existsSync(notFound)) res.sendFile(notFound);
  else res.type('text').send('404 — not found');
});

app.listen(PORT, HOST, () => {
  console.log(`SVGarden serving ${DIST} on http://${HOST}:${PORT} (${buildInfo.snippets ?? '?'} snippets, built ${buildInfo.built ?? '?'})`);
});