import http from 'node:http';
import { readFile } from 'node:fs/promises';
import { fileURLToPath } from 'node:url';
import { resolve } from 'node:path';
import { telemetry, profiles } from './telemetry.mjs';

const assets = new Map([
  ['/', ['index.html', 'text/html']], ['/index.html', ['index.html', 'text/html']],
  ['/app.js', ['app.js', 'text/javascript']], ['/styles.css', ['styles.css', 'text/css']]
]);
export function createServer() {
  return http.createServer(async (req, res) => {
    res.setHeader('X-Content-Type-Options', 'nosniff');
    res.setHeader('Cache-Control', 'no-store');
    const send = (status, value) => {
      res.writeHead(status, { 'Content-Type': 'application/json; charset=utf-8' });
      res.end(JSON.stringify(value));
    };
    if (req.method !== 'GET' && req.method !== 'HEAD') return send(405, { error: 'Lecture seule' });
    const url = new URL(req.url, 'http://localhost');
    if (url.pathname === '/api/health') return send(200, { status: 'ok', source: 'demo' });
    if (url.pathname === '/api/telemetry') {
      const profile = url.searchParams.get('profile') || 'route';
      return profiles.includes(profile) ? send(200, telemetry(profile)) : send(400, { error: 'Profil inconnu' });
    }
    const asset = assets.get(url.pathname);
    if (!asset) return send(404, { error: 'Introuvable' });
    try {
      const content = await readFile(new URL(`../ui/${asset[0]}`, import.meta.url));
      res.writeHead(200, { 'Content-Type': `${asset[1]}; charset=utf-8` });
      res.end(req.method === 'HEAD' ? undefined : content);
    } catch { send(500, { error: 'Interface indisponible' }); }
  });
}
if (process.argv[1] && fileURLToPath(import.meta.url) === resolve(process.argv[1])) {
  const port = Number(process.env.PORT || 8080);
  createServer().listen(port, process.env.HOST || '0.0.0.0', () => console.log(`CARIA : http://localhost:${port}`));
}