middleware.ts

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

export function middleware(request: NextRequest) {
  // Check if user is authenticated by looking for token in cookies or headers
  const token =
    request.cookies.get("token")?.value ??
    request.headers.get("authorization")?.replace("Bearer ", "");

  const isAuthPage =
    request.nextUrl.pathname.startsWith("/login") ||
    request.nextUrl.pathname.startsWith("/register");

  const isPublicPage = isAuthPage;

  // If user is not authenticated and trying to access protected route
  if (!token && !isPublicPage) {
    return NextResponse.redirect(new URL("/login", request.url));
  }

  // If user is authenticated and trying to access auth pages, redirect to home
  if (token && isAuthPage) {
    return NextResponse.redirect(new URL("/", request.url));
  }

  return NextResponse.next();
}

export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - api (API routes)
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     */
    "/((?!api|_next/static|_next/image|favicon.ico).*)",
  ],
};