import fs from "node:fs";
import path from "node:path";
import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import {
  DUPLICATES_FILENAME,
  type DuplicateReport,
} from "yt-dlp-transcript-common/lib/duplicates";

// Whether this site has a duplicate-shorts report to show. compose-site.ts writes
// public/<DUPLICATES_FILENAME> only when the per-site `duplicates` toggle is on
// AND there's at least one in-scope cluster, so its mere presence is the signal:
// no file → the Duplicates nav link hides and the page shows its empty state.
// Read synchronously — this is a static export, evaluated once per build.
export function hasDuplicates(): boolean {
  try {
    const file = path.join(getPaths().exportPublicDir, DUPLICATES_FILENAME);
    const parsed = JSON.parse(fs.readFileSync(file, "utf8")) as DuplicateReport;
    return Array.isArray(parsed?.clusters) && parsed.clusters.length > 0;
  } catch {
    return false;
  }
}