import { currentSite } from "./site";
import { shipsPwa as contractShipsPwa } from "yt-dlp-transcript-common/lib/archive/contract";

// The export app renders one of two shells, selected at build time:
//   site (default): a single-site archive, exactly as before.
//   hub:            the federated Archilyzer hub, reading many sites at runtime.
//
// The single-site path is never touched unless INSTANCE_MODE is explicitly
// "hub", so a plain `next build` stays a site build.
export type InstanceMode = "site" | "hub";

export function instanceMode(): InstanceMode {
  return process.env.INSTANCE_MODE === "hub" ? "hub" : "site";
}

// Whether this build ships an installable PWA — the "dangerous permissions"
// surface: a service worker, a web manifest, and installability. See
// lib/archive/contract.ts shipsPwa() for what the axis means; this wrapper only
// supplies the site, which the export app resolves at build/render time.
//
// Was a second copy of the predicate with a "keep in sync" comment pointing at
// compose-site.ts's copy. Both are gone; there is one.
//
// Hub mode needs no branch of its own any more: currentSite() already returns
// hubSite(), which sets `pwa: true` (export/app/lib/site.ts), and the contract
// predicate reads INSTANCE_MODE itself — so the old
// `if (instanceMode() === "hub") return true` short-circuit was true twice over.
//
// SERVER-ONLY, deliberately: the contract predicate reads
// `process.env.INSTANCE_MODE`, which is not a `NEXT_PUBLIC_` var and is not in a
// next.config `env:` block, so Next does NOT inline it into a client bundle.
// The only caller is export/app/layout.tsx, a server component — and
// currentSite() is server-only regardless, since it reads the sites dir.
// Calling this from a client component would read `undefined` and silently turn
// hub mode off; that would need a guard there, not an assumption here.
export function shipsPwa(): boolean {
  return contractShipsPwa(currentSite());
}