// Copies the freshly built SPA (frontend/web/dist) into internal/webui/dist so
// the Go package can //go:embed it into the single Cyrene binary. It runs as the
// last step of `npm run build`. The source dist is the canonical build output,
// so it also serves as the external deploy-override directory.
//
// The destination is wiped first so assets from an older build cannot linger in
// the binary. internal/webui/dist/.gitkeep is committed because //go:embed
// all:dist fails to compile when the directory holds no files at all — that is
// what makes `go build ./...` work in a clean checkout. The wipe may clear build
// output but never the placeholder, so it is restored on every run, including a
// failed copy: a bare placeholder still compiles, a missing one breaks the build.
import { cp, mkdir, rm, writeFile } from "node:fs/promises";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";

const here = dirname(fileURLToPath(import.meta.url));
const src = resolve(here, "dist");
const dest = resolve(here, "..", "..", "internal", "webui", "dist");
const placeholder = ".gitkeep";

await rm(dest, { recursive: true, force: true });
try {
  await cp(src, dest, { recursive: true });
} finally {
  await mkdir(dest, { recursive: true });
  await writeFile(join(dest, placeholder), "");
}
console.log(`webui: copied ${src} -> ${dest}`);