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

export function middleware(request: NextRequest) {
  const token = request.cookies.get('auth_token')?.value;
  const isLoginPage = request.nextUrl.pathname === '/login';

  // If no token exists and user is trying to access a protected route
  // Kick them to the login page immediately at the edge.
  if (!token && !isLoginPage) {
    const loginUrl = new URL('/login', request.url);
    return NextResponse.redirect(loginUrl);
  }

  // If token exists and they are hitting the login page, redirect to dashboard
  if (token && isLoginPage) {
    const dashboardUrl = new URL('/', request.url);
    return NextResponse.redirect(dashboardUrl);
  }

  return NextResponse.next();
}

// See "Matching Paths" below to learn more
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)
     * - images/ (public assets)
     * - banner.png (public assets)
     */
    '/((?!api|_next/static|_next/image|favicon.ico|images|banner).*)',
  ],
};