supabaseClient.ts

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

let client: SupabaseClient | null = null;

export function getSupabaseClient(): SupabaseClient | null {
  const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
  const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY;

  if (!supabaseUrl || !supabaseAnonKey) {
    console.warn('Supabase client not configured. Set NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY.');
    return null;
  }

  if (supabaseUrl.includes('/rest/v1')) {
    console.warn('NEXT_PUBLIC_SUPABASE_URL should be the base project URL (https://<ref>.supabase.co) without /rest/v1.');
  }

  if (!client) {
    client = createClient(supabaseUrl, supabaseAnonKey, {
      auth: { persistSession: false },
    });
  }

  return client;
}