/**
 * 规则引擎服务
 * 管理和执行业务规则
 * 
 * @task_id CORE_RULE_01
 * @description 业务规则管理、规则执行、规则版本控制、规则测试
 * @tech_stack TypeScript + 规则引擎 + 规则编辑器 + 测试框架
 * @acceptance_criteria 规则执行<50ms，支持1000条规则，准确率>99.9%
 */
export class RuleEngineService {
  private rules: Map<string, any> = new Map();

  /**
   * 注册规则
   * @param rule 规则定义
   * @returns 规则ID
   */
  async registerRule(rule: any): Promise<string> {
    const ruleId = `rule_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    this.rules.set(ruleId, rule);
    return ruleId;
  }

  /**
   * 执行规则
   * @param request 业务请求数据
   * @param context 业务上下文
   * @returns 规则执行结果
   */
  async executeRules(request: any, context: any): Promise<any> {
    const startTime = Date.now();
    
    // 简化实现：执行所有规则
    const results = [];
    for (const [ruleId, rule] of this.rules.entries()) {
      try {
        const result = await this.executeRule(rule, request, context);
        results.push({ ruleId, result });
      } catch (error) {
        console.error(`RuleEngineService: Error executing rule ${ruleId}:`, error);
      }
    }

    const processingTime = Date.now() - startTime;
    console.log(`RuleEngineService: Rules executed in ${processingTime}ms`);

    return {
      workflowId: 'default-workflow',
      data: {
        request,
        context,
        ruleResults: results
      }
    };
  }

  /**
   * 执行单个规则
   * @param rule 规则定义
   * @param request 业务请求数据
   * @param context 业务上下文
   * @returns 规则执行结果
   */
  private async executeRule(rule: any, request: any, context: any): Promise<any> {
    // 简化实现：根据规则条件执行
    if (rule.condition) {
      const conditionResult = this.evaluateCondition(rule.condition, request, context);
      if (conditionResult) {
        return rule.action ? rule.action(request, context) : true;
      }
    }
    return false;
  }

  /**
   * 评估规则条件
   * @param condition 条件表达式
   * @param request 业务请求数据
   * @param context 业务上下文
   * @returns 条件评估结果
   */
  private evaluateCondition(condition: any, request: any, context: any): boolean {
    // 简化实现：返回true
    return true;
  }

  /**
   * 获取规则引擎状态
   * @returns 状态信息
   */
  async getStatus(): Promise<any> {
    return {
      status: 'healthy',
      ruleCount: this.rules.size,
      timestamp: new Date().toISOString()
    };
  }
}
