import type { DatabaseSync } from 'node:sqlite';
import type { Alert } from '../AlertEngine.ts';
import type { AlertProducer, ProducerFrequency } from './types.ts';

export type { AlertProducer, ProducerFrequency } from './types.ts';

const producers: AlertProducer[] = [];

/** Register a producer (called once at startup). */
export function registerProducer(p: AlertProducer): void {
  producers.push(p);
}

/** Run all producers for a given frequency tier. */
export async function runProducers(
  db: DatabaseSync,
  frequency: ProducerFrequency,
): Promise<Alert[]> {
  const results: Alert[] = [];
  const tier = producers.filter((p) => p.frequency === frequency);

  for (const producer of tier) {
    try {
      const alerts = await producer.check(db);
      results.push(...alerts);
    } catch (err) {
      console.error(`[alert:${producer.alertType}] check failed:`, err);
    }
  }

  return results;
}

/** Get all registered producer types. */
export function registeredAlertTypes(): string[] {
  return producers.map((p) => p.alertType);
}