import { cp, mkdir, rm } from 'node:fs/promises';
import { existsSync } from 'node:fs';
import path from 'node:path';

const root = process.cwd();
const standalone = path.join(root, '.next', 'standalone');

if (!existsSync(standalone)) {
  throw new Error('Missing .next/standalone. Run next build before preparing the server.');
}

const copies = [
  [path.join(root, '.next', 'static'), path.join(standalone, '.next', 'static')],
  [path.join(root, 'public'), path.join(standalone, 'public')],
];

for (const [source, destination] of copies) {
  if (!existsSync(source)) continue;
  await rm(destination, { recursive: true, force: true });
  await mkdir(path.dirname(destination), { recursive: true });
  await cp(source, destination, { recursive: true });
}

console.log('Prepared standalone server assets.');