import { createClient } from '@supabase/supabase-js';

let _client: ReturnType<typeof createClient> | null = null;

export function getSupabase() {
  if (!_client) {
    const url = process.env.NEXT_PUBLIC_SUPABASE_URL;
    const key = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY;
    if (!url || !key) {
      throw new Error('Missing NEXT_PUBLIC_SUPABASE_URL or NEXT_PUBLIC_SUPABASE_ANON_KEY');
    }
    _client = createClient(url, key, {
      auth: { flowType: 'pkce', persistSession: true, autoRefreshToken: true, detectSessionInUrl: false },
    });
  }
  return _client;
}