middleware.ts

import { betterFetch } from "@better-fetch/fetch";
import type { auth } from "@/lib/auth";
import { NextResponse, type NextRequest } from "next/server";

type Session = typeof auth.$Infer.Session;

export async function middleware(request: NextRequest) {
  const { data: session } = await betterFetch<Session>("/api/auth/get-session", {
    baseURL: request.nextUrl.origin,
    headers: {
      cookie: request.headers.get("cookie") || "",
    },
  });

  const isAuthPage =
    request.nextUrl.pathname === "/signin" ||
    request.nextUrl.pathname === "/signup";
  const isDashboardPage = request.nextUrl.pathname.startsWith("/dashboard");

  if (!session) {
    if (isDashboardPage) {
      return NextResponse.redirect(new URL("/signin", request.url));
    }

    return NextResponse.next();
  }

  if (isAuthPage) {
    return NextResponse.redirect(new URL("/dashboard", request.url));
  }

  return NextResponse.next();
}

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