/**
 * Run the server and the web dev server together, with one Ctrl+C to stop both.
 *
 * A tiny spawner instead of a dependency like concurrently: two fewer packages to
 * install, and it behaves predictably on Windows, which is where this demo runs.
 */

import { spawn } from 'node:child_process';
import { fileURLToPath } from 'node:url';
import path from 'node:path';

const root = path.dirname(path.dirname(fileURLToPath(import.meta.url)));
const npm = process.platform === 'win32' ? 'npm.cmd' : 'npm';

const targets = [
  { name: 'server', args: ['run', 'dev', '-w', 'server'], color: '\x1b[36m' },
  { name: 'web', args: ['run', 'dev', '-w', 'web'], color: '\x1b[35m' },
];

const children = [];
let shuttingDown = false;

for (const t of targets) {
  const child = spawn(npm, t.args, { cwd: root, shell: true, stdio: ['ignore', 'pipe', 'pipe'] });
  children.push(child);

  const prefix = `${t.color}[${t.name}]\x1b[0m `;
  const pipe = (stream) => {
    let buf = '';
    stream.on('data', (chunk) => {
      buf += chunk.toString();
      let i;
      while ((i = buf.indexOf('\n')) >= 0) {
        const line = buf.slice(0, i);
        buf = buf.slice(i + 1);
        if (line.trim()) process.stdout.write(prefix + line + '\n');
      }
    });
  };
  pipe(child.stdout);
  pipe(child.stderr);

  child.on('exit', (code) => {
    if (shuttingDown) return;
    console.log(`${prefix}exited with code ${code}. Shutting down.`);
    shutdown();
  });
}

function shutdown() {
  if (shuttingDown) return;
  shuttingDown = true;
  for (const c of children) {
    if (!c.killed) c.kill();
  }
  setTimeout(() => process.exit(0), 300);
}

process.on('SIGINT', shutdown);
process.on('SIGTERM', shutdown);

console.log('\n  Digital twin demo starting…');
console.log('  Dashboard: \x1b[1mhttp://localhost:5173\x1b[0m');
console.log('  API:       http://localhost:8787\n');