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

export const dynamic = 'force-dynamic';

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

/**
 * Book-comparison proxy (Session 28). Forwards /api/books/* to Express
 * (best lines + per-prop book grid). Read-only, zero-credit.
 */
export async function GET(req: NextRequest, { params }: { params: Promise<{ path: string[] }> }) {
  const { path } = await params;
  const segments = (path || []).map(encodeURIComponent).join('/');
  const qs = req.nextUrl.search;
  try {
    const upstream = await fetch(`${BACKEND_URL}/api/books/${segments}${qs}`, {
      method: 'GET',
      headers: { Accept: 'application/json' },
    });
    const data = await upstream.json().catch(() => ({}));
    return NextResponse.json(data, { status: upstream.status });
  } catch {
    return NextResponse.json({ bestLines: [], books: [] }, { status: 200 });
  }
}
