import { DbClient } from '../prisma/db-client';

/** LISTEN/NOTIFY channels the worker loops wait on, one per outbox. */
export const WAKE_CHANNELS = {
  domainEvents: 'domain_event',
  calendarSync: 'calendar_sync',
  webhookDeliveries: 'webhook_delivery',
  notificationDeliveries: 'notification_delivery',
  voiceExtraction: 'voice_extraction',
} as const;

export type WakeChannel = (typeof WAKE_CHANNELS)[keyof typeof WAKE_CHANNELS];

/**
 * Wakes the worker loop behind `channel` before its next poll. The payload
 * is always empty: the loop reads its work from the table, so nothing can
 * leak through the channel or be slipped in as work. On a transaction
 * client Postgres sends the notification only on commit - a rolled-back
 * write wakes nobody. A lost notification only delays work until the poll.
 */
export async function notifyWorker(
  db: DbClient,
  channel: WakeChannel,
): Promise<void> {
  await db.$executeRaw`SELECT pg_notify(${channel}, '')`;
}