/**
 * 派发器的消费者表 —— 三级消费的两个下游(ADR-008 #2;语义出处 OS 6.3)。
 *
 * 「任务监听(推进旧单)与触发器(起单规则,开新单)**相互独立判定**
 *  —— 同一事件可既推进旧单又起新单。」
 */
import type { Delivery } from '@modules/event';
import type { TaskId } from '@contracts';
import type { Consumer } from './dispatcher.ts';

/** ① 任务监听:投递到任务,环续跑 */
const taskConsumer: Consumer = async (delivery, container) => {
  const envelope = await container.event.getEvent(delivery.eventId);
  if (envelope === undefined) return;
  const taskId = delivery.target.id as TaskId;
  const kind = envelope.type === 'control' ? 'control' : envelope.type === 'time' ? 'time' : envelope.type === 'human' ? 'human' : 'data';
  await container.task.deliver(taskId, {
    kind,
    ref: envelope.correlation.cause.ref,
    payload: envelope.payload.data,
  });
};

/** ② 触发器:开新单;同一事件对同一触发器至多起一单 */
const triggerConsumer: Consumer = async (delivery, container) => {
  const envelope = await container.event.getEvent(delivery.eventId);
  if (envelope === undefined) return;
  await container.trigger.fireByEvent(String(delivery.target.id), envelope.id, {
    type: envelope.type,
    keys: envelope.correlation.keys,
    payload: envelope.payload.data,
    source: envelope.source.kind,
    occurredAt: envelope.occurredAt,
  });
};

export function createConsumers(): ReadonlyMap<Delivery['target']['kind'], Consumer> {
  return new Map<Delivery['target']['kind'], Consumer>([
    ['task', taskConsumer],
    ['trigger', triggerConsumer],
  ]);
}