#!/usr/bin/env node
// E2E fake `next` for the export app's build (release 18 S4). A site's and the
// hub's build stage run compose for real, then `<EXPORT_NEXT_BIN> build` in
// export/ in place of `pnpm exec next build` (common/publish/build.ts) — which
// in the editor's e2e would rebuild the export app beside its running dev
// server, for a minute, to prove nothing about publishing.
//
// What a real `next build` of a static export leaves that the publish stages
// read is `export/out`: the composed `public/` copied in (site.json and
// corpus.json name the site — builtBundleProblem; the hub's tombstones —
// builtHubProblem) and the rendered pages. This writes exactly that: the
// composed public dir (EXPORT_PUBLIC_DIR, which the build step sets) copied to
// ./out, and an index.html. Nothing is rendered.
import { cpSync, existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
import path from "node:path";
import { installFixtureWatchdog } from "./_watchdog.mjs";

installFixtureWatchdog();

const argv = process.argv.slice(2);
if (argv[0] === "--version" || argv[0] === "-v") {
  process.stdout.write("Next.js v16.0.0 (fake)\n");
  process.exit(0);
}
if (argv[0] !== "build") {
  process.stderr.write(`[fake-next] unsupported invocation: ${argv.join(" ")}\n`);
  process.exit(2);
}

const publicDir = process.env.EXPORT_PUBLIC_DIR?.trim() || path.resolve("public");
if (!existsSync(publicDir)) {
  process.stderr.write(`[fake-next] no public dir at ${publicDir}\n`);
  process.exit(1);
}
const out = path.resolve("out");
rmSync(out, { recursive: true, force: true });
mkdirSync(out, { recursive: true });
cpSync(publicDir, out, { recursive: true, dereference: true });
const mode = process.env.INSTANCE_MODE === "hub" ? "hub" : "site";
writeFileSync(
  path.join(out, "index.html"),
  `<!doctype html><html><head><title>fake ${mode} build</title></head><body>${mode}</body></html>\n`,
);
process.stdout.write("   ▲ Next.js 16 (fake)\n");
process.stdout.write(` ✓ Exported ${mode} from ${publicDir} to ${out}\n`);