const { spawn, execSync } = require('child_process');
const http = require('http');
const fs = require('fs');
const path = require('path');

const BACKEND_PORT = 4400;
const MAX_WAIT = 60000;

const distMainPath = path.join(__dirname, '..', 'backend', 'dist', 'main.js');
if (!fs.existsSync(distMainPath)) {
  console.log('[start-dev] Compiling backend dist/main.js before launch...');
  execSync('npm run build', { cwd: path.join(__dirname, '..', 'backend'), stdio: 'inherit' });
}

function waitForBackend(port, timeout) {
  return new Promise((resolve, reject) => {
    const start = Date.now();
    function check() {
      const req = http.get(`http://127.0.0.1:${port}/api/docs`, (res) => {
        resolve();
      });
      req.on('error', () => {
        if (Date.now() - start > timeout) {
          reject(new Error(`Backend did not start within ${timeout/1000}s`));
        } else {
          setTimeout(check, 1000);
        }
      });
      req.setTimeout(3000, () => { req.destroy(); });
    }
    setTimeout(check, 3000);
  });
}

const backend = spawn('npm', ['run', 'dev:backend'], { stdio: 'inherit', shell: true });

waitForBackend(BACKEND_PORT, MAX_WAIT).then(() => {
  const store = spawn('npm', ['run', 'dev:frontend'], { stdio: 'inherit', shell: true });
  const admin = spawn('npm', ['run', 'dev:admin'], { stdio: 'inherit', shell: true });

  const openBrowsers = spawn('node', ['scripts/open-browsers.js'], { stdio: 'inherit', shell: true });

  process.on('SIGINT', () => {
    backend.kill(); store.kill(); admin.kill(); openBrowsers.kill();
    process.exit();
  });
}).catch((err) => {
  console.error(err.message);
  backend.kill();
  process.exit(1);
});