// Copies the frontend's build output, dist/ (from npm run build), to
// ../internal/frontend/dist/, which the backend embeds, so the next Go build
// of job-search serves this frontend:
//
//   npm run build && npm run sync
//
// The old copy is replaced entirely, so files from an earlier build don't
// linger. Its .gitkeep, the only file there that's committed, is put back:
// Go can't embed a directory that doesn't exist.
import { cpSync, existsSync, rmSync, writeFileSync } from 'node:fs';

const source = 'dist';
const target = '../internal/frontend/dist';

if (!existsSync(`${source}/index.html`)) {
  console.error(`${source}/index.html not found: run npm run build first`);
  process.exit(1);
}

rmSync(target, { recursive: true, force: true });
cpSync(source, target, { recursive: true });
writeFileSync(`${target}/.gitkeep`, '');

console.log(`Copied ${source}/ to ${target}/`);