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

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

  if (!process.env.NEXT_PUBLIC_SUPABASE_URL || !process.env.NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY) {
    return supabaseResponse;
  }

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL,
    process.env.NEXT_PUBLIC_SUPABASE_PUBLISHABLE_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));
        },
      },
    }
  );

  // MUST await — otherwise auth check is useless
  const { data: { user } } = await supabase.auth.getUser();

  const pathname = request.nextUrl.pathname;
  const isAuthPage = pathname.startsWith("/auth/") && !pathname.includes("callback");
  const isDashboard = pathname.startsWith("/dashboard-pages") || pathname.startsWith("/admin");

  // Logged-in user on auth pages → redirect to dashboard
  if (user && isAuthPage) {
    return NextResponse.redirect(new URL("/dashboard-pages/dashboard", request.url));
  }

  // Not logged in on protected pages → redirect to login
  if (!user && isDashboard) {
    const url = request.nextUrl.clone();
    url.pathname = "/auth/login";
    url.searchParams.set("next", pathname);
    return NextResponse.redirect(url);
  }

  return supabaseResponse;
}

export const config = {
  // FIX v4.3: Match ALL routes so auth cookies are refreshed on every page load.
  // Without this, navigating to / or other non-dashboard pages doesn't refresh
  // the Supabase session cookie, causing auth to break on page reload.
  matcher: [
    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp|ico)$).*)",
  ],
};