middleware.ts

import { createServerClient } from "@supabase/ssr";
import { NextResponse, type NextRequest } from "next/server";

export async function middleware(request: NextRequest) {
  let supabaseResponse = NextResponse.next({
    request,
  });

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll();
        },
        setAll(cookiesToSet) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value)
          );
          supabaseResponse = NextResponse.next({
            request,
          });
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          );
        },
      },
    }
  );

  // Refresh session if expired
  const {
    data: { user },
  } = await supabase.auth.getUser();

  // Define public routes that don't require authentication
  const publicRoutes = ["/login", "/auth/callback"];
  const isPublicRoute = publicRoutes.some((route) =>
    request.nextUrl.pathname.startsWith(route)
  );

  // Redirect to login if not authenticated and trying to access protected route
  if (!user && !isPublicRoute) {
    const url = request.nextUrl.clone();
    url.pathname = "/login";
    return NextResponse.redirect(url);
  }

  // Redirect to home if authenticated and trying to access login
  if (user && request.nextUrl.pathname === "/login") {
    const url = request.nextUrl.clone();
    url.pathname = "/";
    return NextResponse.redirect(url);
  }

  return supabaseResponse;
}

export const config = {
  matcher: [
    /*
     * Match all request paths except for:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public folder
     * - api routes (they handle their own auth)
     */
    "/((?!_next/static|_next/image|_next/webpack|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp|css)$|api).*)",
  ],
};