/**
 * 执行记录（架构设计 4.2：执行模块）。
 *
 * 平台侧的权威记录：executionId、能力、参数摘要、状态、回执、幂等键。
 * A3.7 落库前的内存实现；幂等索引与参数摘要的语义不随存储变化。
 */
import { createHash } from 'node:crypto';

import type { ExecutionReceipt } from '@aps/contracts';

export interface ExecutionRecord {
  executionId: string;
  capabilityId: string;
  providerId: string;
  sessionId: string;
  projectId: string | null;
  subjectUserId: string;
  /** 参数摘要：只存摘要不存明文（架构设计 4.1「凭据不进日志」同理） */
  paramsDigest: string;
  idempotencyKey?: string;
  status: ExecutionReceipt['status'];
  receipt: ExecutionReceipt;
  createdAt: number;
  updatedAt: number;
}

export function digestParams(params: unknown): string {
  const canonical = JSON.stringify(params ?? null, Object.keys((params ?? {}) as Record<string, unknown>).sort());
  return `sha256:${createHash('sha256').update(canonical).digest('hex').slice(0, 16)}`;
}

export class ExecutionStore {
  private readonly records = new Map<string, ExecutionRecord>();
  private readonly byIdempotencyKey = new Map<string, string>();

  create(input: Omit<ExecutionRecord, 'status' | 'receipt' | 'createdAt' | 'updatedAt'> & { receipt: ExecutionReceipt }): ExecutionRecord {
    const now = Date.now();
    const record: ExecutionRecord = {
      ...input,
      status: input.receipt.status,
      createdAt: now,
      updatedAt: now,
    };
    this.records.set(record.executionId, record);
    if (record.idempotencyKey) this.byIdempotencyKey.set(record.idempotencyKey, record.executionId);
    return record;
  }

  complete(executionId: string, receipt: ExecutionReceipt): ExecutionRecord | undefined {
    const record = this.records.get(executionId);
    if (!record) return undefined;
    record.receipt = receipt;
    record.status = receipt.status;
    record.updatedAt = Date.now();
    return record;
  }

  get(executionId: string): ExecutionRecord | undefined {
    return this.records.get(executionId);
  }

  findByIdempotencyKey(key: string): ExecutionRecord | undefined {
    const executionId = this.byIdempotencyKey.get(key);
    return executionId ? this.records.get(executionId) : undefined;
  }

  /** 某个会话最近的执行记录（上下文摘要里引用工具结果用） */
  listBySession(sessionId: string, limit = 10): ExecutionRecord[] {
    return [...this.records.values()]
      .filter((record) => record.sessionId === sessionId)
      .sort((a, b) => b.createdAt - a.createdAt)
      .slice(0, limit);
  }

  list(limit = 50): ExecutionRecord[] {
    return [...this.records.values()].sort((a, b) => b.createdAt - a.createdAt).slice(0, limit);
  }
}