import fs from "node:fs/promises";
import path from "node:path";
import { guarded, json } from "@/lib/api";
import { env } from "@/lib/env";

/** Serves the Phase Zero benchmark deliverables to the model laboratory. */
export const GET = guarded(async (req) => {
  const file = req.nextUrl.searchParams.get("file") ?? "capability-matrix.json";
  const allowed = ["capability-matrix.json", "benchmark-report.md", "routing-recommendations.md", "routing-recommendations.json", "model-discovery.json", "openai-results.json", "anthropic-results.json", "modality-results.json", "pricing.json"];
  if (!allowed.includes(file)) return json({ error: "fichier inconnu" }, { status: 400 });
  try {
    const data = await fs.readFile(path.join(env.BENCHMARKS_DIR, file), "utf8");
    return new Response(data, { headers: { "content-type": file.endsWith(".md") ? "text/markdown; charset=utf-8" : "application/json" } });
  } catch { return json({ error: "benchmark introuvable" }, { status: 404 }); }
});