import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import {
  getSite,
  defaultSiteId,
  listSiteIds,
  parseSite,
  type Site,
} from "yt-dlp-transcript-common/lib/site";
import {
  getHomepageConfig,
  resolveHomepageSocialLinks,
} from "yt-dlp-transcript-common/lib/homepage";
import { PROJECT_WORDMARK_LEAD } from "yt-dlp-transcript-common/lib/project";

// The export app builds ONE site at a time, selected by the SITE_ID env var
// (set by the build:site script). At dev time SITE_ID may be unset; we then
// fall back to the lone configured site so `next dev` just works for a
// single-site install. Branding, social links, tagline and the charts/search
// data all derive from this site.
//
// When nothing is selected and no (or multiple) sites exist, we synthesize a
// neutral default rather than throwing — otherwise `next dev` would crash on
// boot before any site is configured (and the e2e harness couldn't start the
// server). A real build always passes SITE_ID, so production is unaffected.
// In hub mode the app has no single Site — its branding is the instance-level
// HomepageConfig ("Archilyzer"). Synthesize a Site from it so layout/manifest/
// Header/Footer keep working unchanged (no channels/groups; the hub ships a PWA
// by default; its wordmark splits as the project's own). Read INSTANCE_MODE
// directly here rather than importing mode.ts, which imports currentSite()
// (would be a cycle).
function hubSite(): Site {
  const cfg = getHomepageConfig();
  return parseSite("hub", {
    siteTitle: cfg.siteTitle,
    siteDescription: cfg.siteDescription,
    headerTitle: cfg.headerTitle,
    // "Archi" + "lyzer". Dropped by the parse (whole title heavy) if the
    // operator's homepage.json retitles the header to something it does not
    // start.
    wordmarkLead: PROJECT_WORDMARK_LEAD,
    homeTagline: cfg.homeTagline,
    ...(cfg.siteUrl ? { siteUrl: cfg.siteUrl } : {}),
    socialLinks: resolveHomepageSocialLinks(cfg),
    pwa: true,
    // homepage.json's opt-out, so the hub's modal follows the same switch.
    ...(cfg.transcriptDownloads === false ? { transcriptDownloads: false } : {}),
  });
}

export function currentSite(): Site {
  if (process.env.INSTANCE_MODE === "hub") return hubSite();
  const paths = getPaths();
  const explicit = process.env.SITE_ID;
  if (explicit) return getSite(explicit, paths);
  const fallback = defaultSiteId(paths);
  if (fallback) return getSite(fallback, paths);
  const first = listSiteIds(paths)[0];
  if (first) return getSite(first, paths);
  return parseSite("default", {});
}