import fs from "node:fs";
import path from "node:path";
import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import type { ArchiveManifest } from "yt-dlp-transcript-common/lib/archiveOptions";

// The archive manifest compose-site.ts writes into public/archives at build
// time. Absent when the build didn't generate archives (dev, or opted out), so
// the Downloads page and its Header/Footer links all key off this presence.
// Read synchronously — this is a static export, evaluated once per build.
export function readArchiveManifest(): ArchiveManifest | null {
  try {
    const file = path.join(
      getPaths().exportPublicDir,
      "archives",
      "manifest.json",
    );
    const parsed = JSON.parse(fs.readFileSync(file, "utf8")) as ArchiveManifest;
    if (!parsed || !Array.isArray(parsed.entries)) return null;
    return parsed;
  } catch {
    return null;
  }
}

// Whether this site has at least one downloadable archive to link to — either
// served locally (not oversize) or uploaded to overflow storage (has a `url`).
// Drives showing the Downloads nav/footer entry.
export function hasArchives(): boolean {
  const manifest = readArchiveManifest();
  return !!manifest && manifest.entries.some((e) => !e.oversize || e.url);
}