import { mkdir, readdir, rm, copyFile, stat } from 'node:fs/promises'
import { join, resolve } from 'node:path'

async function copyDir(srcDir, dstDir) {
  await mkdir(dstDir, { recursive: true })
  const entries = await readdir(srcDir, { withFileTypes: true })
  for (const entry of entries) {
    const src = join(srcDir, entry.name)
    const dst = join(dstDir, entry.name)
    if (entry.isDirectory()) {
      await copyDir(src, dst)
      continue
    }
    if (entry.isFile()) {
      await copyFile(src, dst)
    }
  }
}

async function main() {
  const repoRoot = resolve(process.cwd(), '..')
  const fromDir = join(repoRoot, 'dist')
  const toDir = resolve(process.cwd(), 'www')

  const st = await stat(fromDir).catch(() => null)
  if (!st || !st.isDirectory()) {
    throw new Error(`Missing dist/ at ${fromDir}. Run: pnpm -C .. run build:vite`)
  }

  await rm(toDir, { recursive: true, force: true })
  await copyDir(fromDir, toDir)
}

main().catch((err) => {
  console.error(err)
  process.exit(1)
})