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

const url = process.env.NEXT_PUBLIC_SUPABASE_URL;
const anonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY;

let browserClient: SupabaseClient | null = null;

export function getBrowserSupabase(): SupabaseClient | null {
  if (typeof window === 'undefined') return null;
  if (!url || !anonKey) return null;
  if (browserClient) return browserClient;
  browserClient = createClient(url, anonKey, {
    auth: {
      persistSession: true,
      autoRefreshToken: true,
      detectSessionInUrl: true,
    },
  });
  return browserClient;
}

export function getServerSupabase(authHeader?: string | null): SupabaseClient | null {
  if (!url || !anonKey) return null;
  return createClient(url, anonKey, {
    auth: { persistSession: false, autoRefreshToken: false },
    global: authHeader ? { headers: { Authorization: authHeader } } : undefined,
  });
}

export function getServiceRoleSupabase(): SupabaseClient | null {
  const serviceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;
  if (!url || !serviceKey) return null;
  return createClient(url, serviceKey, {
    auth: { persistSession: false, autoRefreshToken: false },
  });
}