server.ts

import express from "express";
import path from "path";
import dns from "dns";
import { promisify } from "util";
import { validateEmailFull } from "./src/lib/validator";

const resolveMx = promisify(dns.resolveMx);

const app = express();
const PORT = 3000;

import batchHandler from './api/validate-batch';

export async function createServer() {
  app.use(express.json());

  // API Routes
  app.get("/api/health", (req, res) => {
    res.json({ 
      status: "ok", 
      node: process.version,
      env: process.env.NODE_ENV,
    });
  });

  // Local Development Route - Mount the native Vercel handler in Express
  app.post("/api/validate-batch", batchHandler);

  // Vite middleware for development
  if (process.env.NODE_ENV !== "production") {
    const { createServer: createViteServer } = await import("vite");
    const vite = await createViteServer({
      server: { middlewareMode: true },
      appType: "spa",
    });
    app.use(vite.middlewares);
  } else {
    const distPath = path.join(process.cwd(), 'dist');
    app.use(express.static(distPath));
    app.get('*', (req, res) => {
      res.sendFile(path.join(distPath, 'index.html'));
    });
  }

  return app;
}

if (process.env.NODE_ENV !== "test") {
  createServer().then((app) => {
    app.listen(PORT, "0.0.0.0", () => {
      console.log(`Server running on http://localhost:${PORT}`);
    });
  });
}

export default app;