/**
 * module: task —— 对外类型(编码规范 §10.1;语义出处 OS 04,AM 01/10)。
 *
 * 任务运行时:生命周期与**终态五名裁定**、Harness 预算执行器 / 停滞熔断、
 * 控制三语义、改派、断点续跑。范式(loop / flow)在此汇流 —— 对流程层与交互层不可区分。
 */
import type { BudgetCaps, ControlSemantic, StaffId, TaskId, TaskRuntimeState, TerminalState } from '@contracts';
import type { BudgetBreach, Consumption, HarnessVerdict } from './internal/domain/harness.ts';
import type { ControlOutcome, ResumeReadiness, TaskSnapshot, TerminalCause } from './internal/domain/lifecycle.ts';

export type {
  BudgetBreach,
  BudgetCaps,
  Consumption,
  ControlOutcome,
  ControlSemantic,
  HarnessVerdict,
  ResumeReadiness,
  TaskRuntimeState,
  TaskSnapshot,
  TerminalCause,
  TerminalState,
};

export class TaskNotFoundError extends Error {
  constructor(readonly taskId: TaskId) {
    super(`任务不存在:${taskId}`);
    this.name = 'TaskNotFoundError';
  }
}

export class TaskAlreadyTerminalError extends Error {
  constructor(
    readonly taskId: TaskId,
    readonly terminal: TerminalState,
  ) {
    super(`任务已终结(${terminal}),不得再推进:${taskId} —— 流级重做一律重开新实例`);
    this.name = 'TaskAlreadyTerminalError';
  }
}

/** 一单任务 —— 活动的运行时实例;**恰有一名负责人** */
/** 落地事实的两种读法:铺平(标量取值)与逐行(数组取值)—— 输出口载荷由此装配 */
export type LandedFacts = {
  readonly flat: Record<string, unknown>;
  readonly rows: ReadonlyArray<{ key: Record<string, unknown>; values: Record<string, unknown> }>;
};

export type Task = {
  readonly id: TaskId;
  readonly activityId: string;
  /** 起单来源:工作流节点;登记触发的直起单为 undefined */
  readonly workflowId?: string;
  readonly nodeId?: string;
  /** `testbed` = 设计台试跑 —— 认得出才拔得掉(仿真不该在别人工作台上过夜) */
  readonly origin?: string;
  readonly ownerId: StaffId;
  readonly title: string;
  readonly runtime: TaskRuntimeState;
  readonly terminal?: TerminalState;
  readonly reason?: string;
  /** 装载信封:包版本 + 各资产生效版 —— 行为可归因 */
  readonly envelope: Readonly<Record<string, unknown>>;
  /** 起单入参:契约的 data —— 引擎求值的作用域底料 */
  readonly data: Readonly<Record<string, unknown>>;
  readonly caps: BudgetCaps;
  readonly used: Consumption;
  readonly startedAt: string;
  readonly finishedAt?: string;
};

export type StartTaskInput = {
  readonly activityId: string;
  readonly ownerId: StaffId;
  readonly title: string;
  readonly workflowId?: string;
  readonly nodeId?: string;
  readonly origin?: string;
  /** 输入:data(按 schema 校验,缺项不得启动)+ message(委托消息,可为空) */
  readonly data: Record<string, unknown>;
  readonly message?: string;
};

export type TickOutcome = {
  readonly task: Task;
  readonly verdict: HarnessVerdict;
  readonly progressed: boolean;
};

export type TaskService = {
  /** 起单:装载 → 校验输入 → 建任务记忆 → 首个回合 */
  start(input: StartTaskInput): Promise<Task>;
  get(taskId: TaskId): Promise<Task>;
  listByOwner(ownerId: StaffId, openOnly?: boolean): Promise<Task[]>;
  /** org 停用前置检查要问的「在途任务」 */
  openTasksOf(ownerId: StaffId): Promise<Array<{ taskId: string; title: string }>>;

  /** 推进一拍:**预算在环外先扣先判**,再交范式引擎 */
  tick(taskId: TaskId): Promise<TickOutcome>;
  /** 事件驱动续跑 —— 挂起期间事件不丢,恢复即补投 */
  deliver(taskId: TaskId, event: { kind: 'data' | 'time' | 'human' | 'control'; ref: string; payload: Record<string, unknown> }): Promise<TickOutcome>;

  /** 控制三语义:暂停 / 叫停 / 终止 */
  control(taskId: TaskId, semantic: ControlSemantic, by: StaffId, reason?: string): Promise<ControlOutcome>;
  resume(taskId: TaskId, by: StaffId): Promise<Task>;
  /**
   * **人答复落库那一刻就把「在办事」写进投影**(2026-08-25):不等派发器投递、推进器
   * 抢到租约再翻 —— 那几秒里对话区(卡状态已落)与工作区(读 runtime)说两句相反的话。
   * 只在挂起等人 / 等外部时翻;已终结、暂停(suspended)、已在跑的原样不动。
   * 返回翻没翻 —— 调用方据此决定要不要广播。
   */
  wake(taskId: TaskId): Promise<boolean>;
  /** 改派:在途任务的负责人变更,**留痕并通知双方** */
  reassign(taskId: TaskId, to: StaffId, by: StaffId): Promise<Task>;

  /** 终态裁定 —— 完成由框架裁定,终态由系统命名 */
  /** `facts` = 落地收敛的事实(仅放行路径有);作为输出口载荷上报流程层 */
  finish(taskId: TaskId, cause: TerminalCause, facts?: LandedFacts): Promise<Task>;
  /** 断点续跑的三份持久状态是否齐备 */
  resumeReadiness(taskId: TaskId): Promise<ResumeReadiness>;
};