const INTERNAL_API_BASE_URL = (process.env.INTERNAL_API_BASE_URL || "http://127.0.0.1:8000").replace(
  /\/$/,
  "",
);

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

type RouteContext = {
  params: Promise<{
    path?: string[];
  }>;
};

async function proxy(request: Request, context: RouteContext) {
  const { path = [] } = await context.params;
  const sourceUrl = new URL(request.url);
  const targetUrl = new URL(`/api/${path.join("/")}${sourceUrl.search}`, INTERNAL_API_BASE_URL);

  const headers = new Headers(request.headers);
  headers.delete("host");
  headers.delete("connection");
  headers.delete("content-length");

  const body =
    request.method === "GET" || request.method === "HEAD" ? undefined : await request.arrayBuffer();

  const response = await fetch(targetUrl, {
    method: request.method,
    headers,
    body,
    redirect: "manual",
  });

  const responseHeaders = new Headers(response.headers);
  responseHeaders.delete("content-encoding");
  responseHeaders.delete("content-length");

  return new Response(response.body, {
    status: response.status,
    statusText: response.statusText,
    headers: responseHeaders,
  });
}

export function GET(request: Request, context: RouteContext) {
  return proxy(request, context);
}

export function POST(request: Request, context: RouteContext) {
  return proxy(request, context);
}

export function PUT(request: Request, context: RouteContext) {
  return proxy(request, context);
}

export function PATCH(request: Request, context: RouteContext) {
  return proxy(request, context);
}

export function DELETE(request: Request, context: RouteContext) {
  return proxy(request, context);
}

export function HEAD(request: Request, context: RouteContext) {
  return proxy(request, context);
}