import { NextRequest, NextResponse } from 'next/server';

export const dynamic = 'force-dynamic';

const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:3000';

/**
 * Stat leaders proxy (Session 42). Forwards GET /api/stats/leaders to Express,
 * preserving ?sport=&stat=&limit=. Powers the Terminal / Stats Explorer.
 */
export async function GET(req: NextRequest) {
  const qs = req.nextUrl.search;
  try {
    const upstream = await fetch(`${BACKEND_URL}/api/stats/leaders${qs}`, {
      method: 'GET',
      headers: { Accept: 'application/json' },
    });
    const data = await upstream.json().catch(() => ({}));
    return NextResponse.json(data, { status: upstream.ok ? 200 : upstream.status });
  } catch {
    return NextResponse.json({ error: 'Stats service is unreachable. Try again in a moment.' }, { status: 502 });
  }
}