/**
 * llmindex.io — GET /api/v1/leaderboard/:domain (per-domain ranking + sub-metrics)
 * Author:  Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 * License: Proprietary — © Simon-Pierre Boucher, all rights reserved
 */
import { type NextRequest } from 'next/server';
import { isDomain } from '@llmindex/scoring';
import { getLeaderboard } from '@/lib/data';
import { apiError, apiJson } from '@/lib/api';
import { rateLimit } from '@/lib/rate-limit';

export const dynamic = 'force-dynamic';

export async function GET(req: NextRequest, { params }: { params: { domain: string } }) {
  const limited = await rateLimit(req);
  if (limited) return limited;
  if (!isDomain(params.domain)) return apiError(404, 'unknown_domain');
  const search = req.nextUrl.searchParams;
  const limit = Math.min(200, Math.max(1, Number(search.get('limit') ?? 50)));
  const offset = Math.max(0, Number(search.get('offset') ?? 0));
  const data = await getLeaderboard(params.domain, limit, offset);
  if (!data) return apiError(503, 'no_score_run_available');
  return apiJson(
    {
      index_version: data.run.indexVersion,
      domain: params.domain,
      run: {
        id: data.run.id,
        kind: data.run.kind,
        status: data.run.status,
        created_at: data.run.createdAt,
        notes: data.run.notes,
      },
      pagination: { limit, offset, count: data.entries.length },
      entries: data.entries.map((e) => ({
        rank: e.rank,
        model: e.slug,
        name: e.name,
        provider: e.provider,
        score: e.score,
        score_low: e.scoreLow,
        score_high: e.scoreHigh,
        sub_metrics: e.subMetrics,
      })),
    },
    { cacheSeconds: 3600 },
  );
}