import path from 'path';
import fs from 'fs';

export default function handler(req: any, res: any) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');

  if (req.method === 'OPTIONS') {
    // Handle preflight
    res.status(200).end();
    return;
  }

  const buildId = fs.readFileSync(path.join(process.cwd(), '.next', 'BUILD_ID'), 'utf8').trim();
  res.setHeader('Cache-Control', 's-maxage=31536000, stale-while-revalidate');
  res.status(200).json({ buildId });
}