middleware.ts

import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

const PUBLIC_ROUTES = ["/signin", "/signup"];
const DEFAULT_AUTH_REDIRECT = "/dashboard";
const DEFAULT_GUEST_REDIRECT = "/signin";

export function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;
  const token = request.cookies.get("access_token");

  const isPublic = PUBLIC_ROUTES.some((route) => pathname.startsWith(route));

  const isProtected =
    pathname.startsWith("/dashboard") ||
    pathname.startsWith("/profile") ||
    pathname.startsWith("/logout");

  if (!token && isProtected) {
    return NextResponse.redirect(new URL(DEFAULT_GUEST_REDIRECT, request.url));
  }

  if (token && isPublic) {
    return NextResponse.redirect(new URL(DEFAULT_AUTH_REDIRECT, request.url));
  }

  if (pathname === "/") {
    return NextResponse.redirect(
      new URL(
        token ? DEFAULT_AUTH_REDIRECT : DEFAULT_GUEST_REDIRECT,
        request.url,
      ),
    );
  }

  return NextResponse.next();
}

export const config = {
  matcher: ["/:path*"],
};