import { sql } from "drizzle-orm";
import { db } from "../db.js";
import { logger } from "../logger.js";

export type WebEvent =
  // QR PNG bytes live in `whatsapp_accounts.last_qr_png` so this NOTIFY
  // payload stays under Postgres' 8000-byte limit. Web fetches the PNG
  // from /api/qr/[accountId] when it sees this event.
  | { type: "session.qr"; accountId: string; ts: number }
  | { type: "session.connected"; accountId: string; phoneNumber: string | null }
  | { type: "session.disconnected"; accountId: string }
  | { type: "session.timeout"; accountId: string }
  | { type: "groups.synced"; accountId: string; count: number }
  | { type: "reminder.fired"; reminderId: string; runId: string; status: string }
  | { type: "reminder.failed"; reminderId: string; error: string }
  // The web action enqueues a send_test via pg_notify and shows
  // "Sending…" optimistically. This event closes the loop.
  | {
      type: "send_test.done";
      groupId: string;
      ok: boolean;
      error: string | null;
    };

export async function pgNotifyWeb(event: WebEvent): Promise<void> {
  const json = JSON.stringify(event);
  // pg_notify takes a literal channel name as 1st arg.
  await db.execute(sql`SELECT pg_notify('web.event', ${json})`);
  logger.debug({ event: event.type }, "ipc: web.event published");
}