import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import {
  isValidChannelSlug,
  readChannelConfig,
  readChannelSnapshot,
} from "yt-dlp-transcript-common/controller/channels";
import { loadCleanupRow } from "../../../../cleanup/lib/loadCleanup";
import { opsFail } from "../../_lib";
import { readRoute } from "../../_read";

export const dynamic = "force-dynamic";

// GET /api/ops/cleanup/<slug>
//
// One channel's row of the /cleanup ledger (`loadCleanupRow`), off its report:
// what each sweep would reclaim — `transcribedBytes` (audio of videos that have
// a transcript: "Clean audio"), `extraFormatsBytes`, `foreignBytes` (audio not
// in the target format) — which OVERLAP and are never summed; what holds the
// rest (`heldBytes`/`heldCounts`: no transcript, keep-latest, do-not-clean,
// awaiting diarization); whether the channel is in the ledger's total
// (`included`); and the failed-transcriptions list's length. `measured: false`
// means the report predates the accounting: its zeros are unknowns.
//
// The sweeps themselves are `POST /api/ops/cleanup`.
export async function GET(
  request: Request,
  { params }: { params: Promise<{ slug: string }> },
) {
  const { slug } = await params;
  return readRoute(request, [], async () => {
    if (!isValidChannelSlug(slug)) {
      return opsFail(`"${slug}" is not a valid channel slug`);
    }
    const paths = getPaths();
    const config = await readChannelConfig(paths, slug);
    if (!config) return opsFail(`Channel "${slug}" not found`, 404);
    const snapshot = await readChannelSnapshot(paths, slug);
    const row = await loadCleanupRow(paths, { slug, config, snapshot });
    if (!row) return opsFail(`Channel "${slug}" not found`, 404);
    const { channel: _c, snapshot: _s, transcribeIds, autoSubsIds, ...rest } = row;
    void _c;
    void _s;
    return {
      slug,
      reportedAt: snapshot?.generatedAt ?? null,
      ...rest,
      // Counts, not the id lists: a bucket can hold thousands of ids.
      downloadedNoTranscript: transcribeIds.length,
      downloadedAutoSubsOnly: autoSubsIds.length,
    };
  });
}