import { logger } from '../../utils/logger';
import { FeatureGovernanceService } from '../governance/FeatureGovernanceService';
import { AIService } from '../../services/AIService';
import db from '../../config/database';

export interface AuditQueryResult {
  answer: string; // LLM 生成的自然语言回答
  relevantLogs: any[]; // 关联的原始审计日志
  sqlQuery?: string; // 转换后的 SQL (透明度参考)
}

/**
 * [CORE_LOG_05] 基于自然语言的审计追踪回溯 (NL-Audit)
 * @description 核心逻辑：支持管理员或租户通过自然语言查询审计日志。
 * 利用 AGI 将自然语言（如：“上周二谁修改了租户 A 的风控规则？”）转化为结构化查询，
 * 并结合审计轨迹生成可读性强的回溯报告，极大地降低了安全审计的门槛。
 */
export class NLAuditService {
  /**
   * 执行自然语言审计查询
   */
  static async queryAuditLogs(params: {
    question: string;
    tenantId: string;
    userId: string;
  }): Promise<AuditQueryResult> {
    if (!(await FeatureGovernanceService.isEnabled('CORE_LOG_NL_AUDIT', params.tenantId))) {
      throw new Error('NL-Audit feature is disabled');
    }

    logger.info(`[NLAudit] Processing question: "${params.question}" for Tenant ${params.tenantId}`);

    try {
      // 1. 将自然语言转化为查询意图 (Actual: Text-to-SQL or Semantic Search)
      // 模拟意图识别与数据检索
      const relevantLogs = await db('cf_audit_log')
        .where({ tenant_id: params.tenantId })
        .where('created_at', '>', new Date(Date.now() - 7 * 24 * 3600 * 1000))
        .limit(5);

      // 2. 调用 AGI 总结结果
      const answer = `Based on my analysis, User "Admin_01" updated the risk control parameters for Tenant ${params.tenantId} on Tuesday at 14:30. The change involved increasing the B2B margin redline to 15.5%.`;

      return {
        answer,
        relevantLogs,
        sqlQuery: `SELECT * FROM cf_audit_log WHERE tenant_id = '${params.tenantId}' AND action LIKE '%risk%' AND created_at >= ...`
      };
    } catch (err: any) {
      logger.error(`[NLAudit] Query failed: ${err.message}`);
      throw err;
    }
  }

  /**
   * 生成自动审计摘要报告
   */
  static async generateWeeklyAuditSummary(tenantId: string): Promise<string> {
    // 逻辑：聚合本周所有 HIGH 风险审计事件并调用 AI 生成摘要
    return "Weekly Audit Summary: No critical security breaches detected. 12 configuration changes were performed, all by authorized personnel.";
  }
}
