proxy.ts

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

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

  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)
          );
          response = NextResponse.next({
            request,
          });
          cookiesToSet.forEach(({ name, value, options }) =>
            response.cookies.set(name, value, options)
          );
        },
      },
    }
  );

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

  const pathname = request.nextUrl.pathname;

  // Protected routes that require authentication
  const protectedRoutes = ["/dashboard", "/onboarding", "/settings"];
  const isProtectedRoute = protectedRoutes.some((route) =>
    pathname.startsWith(route)
  );

  // Auth routes (login, signup) that should redirect to dashboard if already logged in
  const authRoutes = ["/login", "/signup"];
  const isAuthRoute = authRoutes.some((route) => pathname.startsWith(route));

  // If user is not authenticated and trying to access protected route
  if (!user && isProtectedRoute) {
    const redirectUrl = new URL("/login", request.url);
    redirectUrl.searchParams.set("redirectTo", pathname);
    return NextResponse.redirect(redirectUrl);
  }

  // If user is authenticated and trying to access auth routes
  if (user && isAuthRoute) {
    // Check if user has a profile by querying the database
    const { data: profile } = await supabase
      .from("profiles")
      .select("username")
      .eq("id", user.id)
      .single();

    // Redirect to onboarding if no profile, otherwise to dashboard
    if (!profile) {
      return NextResponse.redirect(new URL("/onboarding", request.url));
    }
    return NextResponse.redirect(new URL("/dashboard", request.url));
  }

  // If user is authenticated and trying to access dashboard without profile
  if (user && pathname.startsWith("/dashboard")) {
    const { data: profile } = await supabase
      .from("profiles")
      .select("username")
      .eq("id", user.id)
      .single();

    // Redirect to onboarding if no profile exists
    if (!profile) {
      return NextResponse.redirect(new URL("/onboarding", request.url));
    }
  }

  // If user is authenticated, has profile, and trying to access onboarding
  if (user && pathname.startsWith("/onboarding")) {
    const { data: profile } = await supabase
      .from("profiles")
      .select("username")
      .eq("id", user.id)
      .single();

    // Redirect to dashboard if profile already exists
    if (profile) {
      return NextResponse.redirect(new URL("/dashboard", request.url));
    }
  }

  return response;
}

export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public files (public folder)
     */
    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
  ],
};