import { withUser, json, ApiError } from "@/lib/api";
import { LIMITS } from "@/lib/rate-limit";
import { listFiles, saveFile, deleteFile, LIBRARY_MAX_BYTES } from "@/lib/library/service";

export const dynamic = "force-dynamic";

/** GET /api/library/files?projectId=<id|none>&q=&kind= → { files } (metadata only). */
export const GET = withUser(async ({ req, user }) => {
  const p = new URL(req.url).searchParams;
  const files = await listFiles(user.id, {
    projectId: p.get("projectId") ?? undefined,
    q: p.get("q") ?? undefined,
    kind: p.get("kind") ?? undefined,
    limit: p.get("limit") ? Number(p.get("limit")) : undefined,
  });
  return json({ files });
});

/** POST /api/library/files — multipart: file, projectId?, description? → 201 { file } */
export const POST = withUser(
  async ({ req, user }) => {
    const len = Number(req.headers.get("content-length") ?? 0);
    if (len > LIBRARY_MAX_BYTES + 8192) throw new ApiError(413, "File too large (max 10 MB)", "PAYLOAD_TOO_LARGE");
    const form = await req.formData().catch(() => null);
    const file = form?.get("file");
    if (!(file instanceof File)) throw new ApiError(400, "Missing file", "BAD_REQUEST");
    const projectId = form?.get("projectId");
    const description = form?.get("description");
    const saved = await saveFile(user.id, {
      file,
      projectId: typeof projectId === "string" && projectId && projectId !== "none" ? projectId.slice(0, 64) : null,
      description: typeof description === "string" ? description : null,
    });
    return json({ file: saved }, { status: 201 });
  },
  { limit: { ...LIMITS.upload, key: "library-upload" } },
);

/** DELETE /api/library/files?id= */
export const DELETE = withUser(async ({ req, user }) => {
  const id = new URL(req.url).searchParams.get("id");
  if (!id) throw new ApiError(400, "Missing id");
  await deleteFile(user.id, id);
  return json({ ok: true });
});