import type { APIRoute } from "astro";

const apiBase = process.env.API_INTERNAL_URL || import.meta.env.API_INTERNAL_URL || "http://localhost:8000";

export const GET: APIRoute = async ({ params }) => {
  const digest = params.digest ?? "";
  if (!/^[a-f0-9]{64}$/.test(digest)) return new Response("Not found", { status: 404 });

  try {
    const upstream = await fetch(`${apiBase}/api/v1/media/assets/${digest}`);
    if (!upstream.ok || !upstream.body) return new Response("Not found", { status: upstream.status === 404 ? 404 : 502 });
    const headers = new Headers();
    for (const name of ["content-type", "content-length", "cache-control", "etag"]) {
      const value = upstream.headers.get(name);
      if (value) headers.set(name, value);
    }
    return new Response(upstream.body, { status: 200, headers });
  } catch {
    return new Response("Media service unavailable", { status: 502 });
  }
};