import { withUser, json, ApiError } from "@/lib/api";
import { getArenaScoreboard } from "@/lib/arena/service";
import { CRITERION_RE, isTaskCategory } from "@/lib/arena/scoring";

export const dynamic = "force-dynamic";

/**
 * GET /api/arena/scoreboard?category=coding|research|writing|reasoning|general&criterion=best|value|…
 * → { rows: ScoreboardRow[], sessions, votes }
 */
export const GET = withUser(async ({ req, user }) => {
  const url = new URL(req.url);
  const category = url.searchParams.get("category") || null;
  const criterion = url.searchParams.get("criterion") || null;
  if (category && !isTaskCategory(category)) throw new ApiError(400, "Unknown category", "VALIDATION_ERROR");
  if (criterion && !CRITERION_RE.test(criterion)) throw new ApiError(400, "Unknown criterion", "VALIDATION_ERROR");
  return json(await getArenaScoreboard(user.id, { category: category && isTaskCategory(category) ? category : null, criterion }));
});