import { createServer } from "node:http";
import { Buffer } from "node:buffer";

const PORT = Number(process.env.PORT || 7860);
const encoded = process.env.APP_CODE_B64;

function sendSetupPage(response) {
  response.writeHead(503, {
    "Content-Type": "application/json; charset=utf-8",
    "Access-Control-Allow-Origin": "*"
  });
  response.end(JSON.stringify({
    error: "APP_CODE_B64 secret is not set.",
    hint: "Set APP_CODE_B64 in the Hugging Face Space secrets, then restart the Space."
  }, null, 2));
}

if (!encoded) {
  createServer((_request, response) => sendSetupPage(response)).listen(PORT, "0.0.0.0", () => {
    console.log(`Secret loader waiting on 0.0.0.0:${PORT}`);
  });
} else {
  try {
    const source = Buffer.from(encoded, "base64").toString("utf8");
    const moduleUrl = `data:text/javascript;base64,${Buffer.from(source, "utf8").toString("base64")}`;
    const mod = await import(moduleUrl);
    if (typeof mod.start !== "function") {
      throw new Error("Private module must export start(options).");
    }
    await mod.start({ port: PORT });
  } catch (error) {
    console.error("Failed to start private proxy:", error?.message || error);
    createServer((_request, response) => {
      response.writeHead(500, { "Content-Type": "application/json; charset=utf-8" });
      response.end(JSON.stringify({ error: "Failed to start private proxy." }));
    }).listen(PORT, "0.0.0.0");
  }
}