import { NextResponse } from "next/server";
import subdomains from "./subdomains.json";

export const config = {
matcher: ["/((?!api/|_next/|_static/|_vercel|[\w-]+\.\w+).*)"],
};

export default async function middleware(req) {
const url = new URL(req.url);
const hostname = req.headers.get("host") || "";

// Define list of allowed domains
// (including localhost and your deployed domain)
const allowedDomains = [
"localhost:3000",
"localhost:3002",
"example.com"
];

// Check if the current hostname is in the list of allowed domains
const isAllowedDomain = allowedDomains.some((domain) =>
hostname.includes(domain)
);

// Extract the potential subdomain from the URL
const subdomain = hostname.split(".")[0];

// If user is on an allowed domain and it's not a subdomain, allow the request
if (isAllowedDomain && !subdomains.some((d) => d.subdomain === subdomain)) {
return NextResponse.next();
}

const subdomainData = subdomains.find((d) => d.subdomain === subdomain);

if (subdomainData) {
// Rewrite the URL to a dynamic path based on the subdomain
const response = NextResponse.rewrite(
new URL(/${subdomain}${url.pathname}, req.url)
);
// Set a custom header to pass tenant information
response.cookies.set("tenant", subdomainData.subdomain, { path: "/" });
return response;
}

return new Response(null, { status: 404 });
}