import { isEpisode, parsePhraseQuery, searchPhrases, MAX_TERMS } from "@/lib/phrases";

export const dynamic = "force-dynamic";

// The MECHANISM surface. /browse/find calls searchPhrases() directly and never
// touches this route -- a page that fetched its own API would serialise a
// render behind a round trip to itself for nothing.
//
// This exists so the e2e suite and a script can ask the same question the page
// asks, and get the same answer from the same parser. If the two ever drifted,
// the suite would be testing a second implementation instead of the one that
// ships; parsePhraseQuery is shared precisely so they cannot.

export async function GET(request: Request) {
  const url = new URL(request.url);
  const { query, errors } = parsePhraseQuery(url.searchParams);

  if (!query.q.trim()) {
    return Response.json({ error: "q is required" }, { status: 400 });
  }
  if (errors.length) {
    return Response.json({ error: errors[0].message, errors, maxTerms: MAX_TERMS }, { status: 400 });
  }
  if (query.video && !(await isEpisode(query.video))) {
    return Response.json({ error: `no episode called ${query.video}` }, { status: 404 });
  }

  return Response.json(await searchPhrases(query), {
    headers: { "cache-control": "no-store" },
  });
}