import { NextResponse } from "next/server";
import { getPaths } from "yt-dlp-transcript-common/lib/paths";
import { isValidChannelSlug } from "yt-dlp-transcript-common/controller/channels";
import { readVideoCues } from "yt-dlp-transcript-common/controller/videoCues";
import { readRoute } from "../_read";
import { opsFail } from "../_lib";

export const dynamic = "force-dynamic";

// GET ?id=<videoId>[&slug=<channel>]
//   -> { ok, slug, id, source: "cues.json" | "built" | "vtt",
//        cuesJson: "fresh" | "stale" | "missing", title?, channel?,
//        uploadDate?, duration?, webpageUrl?, platform?, description?, file?,
//        cues: [{ start, end, text }] }
//
// One video's cues off disk, with no index (controller/videoCues.ts): a fresh
// transcript.cues.json, else what normalize would write, else the English VTT
// alone. Nothing is written. Without `slug` the channel holding data/<id>/ is
// found (two holders → 409, name it). The MCP's get_transcript asks this when
// the archive it reads has no such video.
export async function GET(request: Request) {
  return readRoute(request, ["id", "slug"], async (q) => {
    const id = q.get("id")?.trim() ?? "";
    if (!id) return opsFail('"id" is required');
    const slug = q.get("slug")?.trim() || undefined;
    if (slug !== undefined && !isValidChannelSlug(slug)) {
      return opsFail(`"${slug}" is not a valid channel slug`);
    }
    const read = await readVideoCues(getPaths(), { id, ...(slug ? { slug } : {}) });
    if ("error" in read) return opsFail(read.error, read.status);
    return NextResponse.json({ ok: true, ...read });
  });
}