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

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

  const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
  const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY;

  if (!supabaseUrl || !supabaseAnonKey) {
    return response;
  }

  const supabase = createServerClient(supabaseUrl, supabaseAnonKey, {
    cookies: {
      getAll() {
        return request.cookies.getAll();
      },
      setAll(
        cookiesToSet: Array<{ name: string; value: string; options: CookieOptions }>,
      ) {
        cookiesToSet.forEach(({ name, value }) => request.cookies.set(name, value));
        response = NextResponse.next({ request });
        cookiesToSet.forEach(({ name, value, options }) =>
          response.cookies.set(name, value, options),
        );
      },
    },
  });

  const {
    data: { user },
  } = await supabase.auth.getUser();

  const { pathname } = request.nextUrl;

  // Authenticated user on landing page -> redirect to home
  if (user && pathname === "/") {
    const url = request.nextUrl.clone();
    url.pathname = "/home";
    return NextResponse.redirect(url);
  }

  // Unauthenticated user accessing app routes -> redirect to landing
  if (!user && (pathname.startsWith("/list") || pathname.startsWith("/home"))) {
    const url = request.nextUrl.clone();
    url.pathname = "/";
    return NextResponse.redirect(url);
  }

  return response;
}

export const config = {
  matcher: [
    /*
     * Match all request paths except:
     * - _next/static (static files)
     * - _next/image (image optimization)
     * - favicon.ico (favicon)
     * - /api/* (API routes)
     * - /admin/* (admin routes - has its own auth)
     */
    "/((?!_next/static|_next/image|favicon\\.ico|api/|admin).*)",
  ],
};