/**
 * module: event —— 本模块要外界提供的能力(编码规范 §10.1 / §5.3)。
 *
 * 注意层级:event 是 L1,而任务(L6)、触发器(L7)、消息(L2)都在其上 —— 三级消费的
 * 三个下游一律以**端口**声明、由 app 装配注入,event 不反向依赖上层(§4 / §5.2)。
 */
import type { Delivery, Envelope, EventId, RegisteredListener, TaskId } from '@contracts';
import type { OutboundRef } from './internal/domain/ownership.ts';
import type { ConditionEvaluator } from './internal/domain/listener-match.ts';

export type Clock = { now(): Date };
export type IdGenerator = { next(): string };
export type { ConditionEvaluator };

/** 事件存储 —— 「先持久后投递」的底座 */
export type EventStore = {
  /** 信封落库与入队同一事务 */
  persistAndEnqueue(envelope: Envelope, targets: readonly Delivery[]): Promise<void>;
  get(id: EventId): Promise<Envelope | undefined>;
  listByTask(taskId: TaskId, limit: number): Promise<Envelope[]>;

  listenersOf(taskId: TaskId): Promise<RegisteredListener[]>;
  /** 全部 armed 监听 —— 事件到达时的匹配面 */
  armedListeners(): Promise<RegisteredListener[]>;
  saveListener(listener: RegisteredListener): Promise<void>;
  setListenerState(id: string, state: RegisteredListener['state']): Promise<void>;
  expiredListeners(now: Date): Promise<RegisteredListener[]>;

  saveOutbound(ref: OutboundRef): Promise<void>;
  recentOutbound(sinceMs: number, now: Date): Promise<OutboundRef[]>;

  /** 消费幂等表:唯一约束成功返回 true,冲突返回 false */
  claimConsumption(eventId: EventId, consumer: string): Promise<boolean>;

  getDelivery(id: string): Promise<Delivery | undefined>;
  updateDelivery(delivery: Delivery): Promise<void>;
  scheduleRetry(deliveryId: string, delayMs: number): Promise<void>;
};

/** 触发器判定 —— app 注入 `trigger`(L7)的只读用例;返回命中的触发器 ID */
export type TriggerMatcher = { match(envelope: Envelope): Promise<string[]> };

/** 死信与无主兜底 —— app 注入 `message`(L2) */
export type MessageFallback = {
  deadLetter(envelope: Envelope, error: string): Promise<void>;
  unowned(envelope: Envelope, fallbackPosition: string | undefined): Promise<void>;
};