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

const projectRoot = path.resolve('.');
const standaloneRoot = path.join(projectRoot, '.next', 'standalone');

// Instrumentation traces can bypass Next's route-level exclusions. Runtime
// state belongs to the mounted volume, never to a distributable build.
async function removeRuntimeState(directory) {
  for (const entry of await readdir(directory, { withFileTypes: true })) {
    const target = path.resolve(directory, entry.name);
    if (!target.startsWith(`${standaloneRoot}${path.sep}`)) throw new Error('Invalid package path');
    if (entry.name === 'node_modules') continue;
    if (entry.name === 'data' || entry.name === 'backups' || entry.name === 'auth-secret' || /\.sqlite(?:-|$)/.test(entry.name) || /^\.env(?:\.|$)/.test(entry.name)) {
      await rm(target, { recursive: entry.isDirectory(), force: true });
    } else if (entry.isDirectory()) {
      await removeRuntimeState(target);
    }
  }
}
await removeRuntimeState(standaloneRoot);

await cp(path.join(projectRoot, 'public'), path.join(standaloneRoot, 'public'), { recursive: true });
await cp(path.join(projectRoot, 'migrations'), path.join(standaloneRoot, 'migrations'), { recursive: true });
await cp(
  path.join(projectRoot, '.next', 'static'),
  path.join(standaloneRoot, '.next', 'static'),
  { recursive: true },
);