import { listOrphanCandidatesForUser } from "#server/service/media";

type OrphanFilter = "all" | "deletable" | "cooling";

function parseFilter(raw: string | undefined): OrphanFilter {
  const v = raw === undefined || raw === "" ? "all" : raw;
  if (v === "all" || v === "deletable" || v === "cooling") {
    return v;
  }
  throw createError({ statusCode: 400, statusMessage: "filter 须为 all、deletable 或 cooling" });
}

function parsePositiveInt(raw: string | undefined, fallback: number, label: string): number {
  if (raw === undefined || raw === "") {
    return fallback;
  }
  const n = Number(raw);
  if (!Number.isInteger(n) || n < 1) {
    throw createError({ statusCode: 400, statusMessage: `${label} 须为正整数` });
  }
  return n;
}

export default defineWrappedResponseHandler(async (event) => {
  const user = await event.context.auth.requireUser();
  const q = getQuery(event);
  const filter = parseFilter(typeof q.filter === "string" ? q.filter : undefined);
  const page = parsePositiveInt(typeof q.page === "string" ? q.page : undefined, 1, "page");
  const pageSizeRaw = parsePositiveInt(
    typeof q.pageSize === "string" ? q.pageSize : undefined,
    20,
    "pageSize",
  );
  const pageSize = Math.min(pageSizeRaw, 100);

  const { items, total } = await listOrphanCandidatesForUser(user.id, filter, page, pageSize);
  return R.success({ items, total });
});