import {
  normalizeTargetUrl,
  stripRelayHeaders,
  buildRelayRequest,
  createRelayResponse,
} from "./relay-utils";

export const config = { runtime: "edge" };

export default async function handler(req: Request): Promise<Response> {
  const target = req.headers.get("x-relay-target");
  const relayPath = req.headers.get("x-relay-path") || "/";

  const targetUrl = normalizeTargetUrl(target, relayPath);
  if (!targetUrl) {
    return new Response(JSON.stringify({ error: "Missing x-relay-target header" }), {
      status: 400,
      headers: { "content-type": "application/json" },
    });
  }

  const headers = stripRelayHeaders(new Headers(req.headers));
  const fetchOptions = buildRelayRequest(req, targetUrl, headers);

  const response = await fetch(targetUrl, fetchOptions);
  return createRelayResponse(response);
}