/**
 * NAC知识引擎 — 规则冲突检测引擎 (v19)
 *
 * 功能：
 * 1. 检测不同辖区间同类资产的合规规则冲突
 * 2. AI分析冲突原因和解决建议
 * 3. 生成冲突报告
 */

import { getMongoDb, COLLECTIONS } from "./mongodb";
import { invokeLLM } from "./_core/llm";

// ─── 类型定义 ──────────────────────────────────────────────────────
export interface ConflictItem {
  conflictId: string;
  assetType: string;
  jurisdictionA: string;
  jurisdictionB: string;
  ruleA: { id: string; name: string; description: string };
  ruleB: { id: string; name: string; description: string };
  conflictType: "requirement" | "prohibition" | "threshold" | "procedure" | "definition";
  severity: "low" | "medium" | "high" | "critical";
  description: string;
  aiSuggestion?: string;
  detectedAt: Date;
}

export interface ConflictReport {
  generatedAt: Date;
  assetType?: string;
  totalConflicts: number;
  bySeverity: Record<string, number>;
  byAssetType: Record<string, number>;
  conflicts: ConflictItem[];
  summary: string;
}

// ─── 冲突类型标签 ─────────────────────────────────────────────────
const CONFLICT_TYPE_LABELS: Record<string, string> = {
  requirement: "要求冲突",
  prohibition: "禁止冲突",
  threshold: "阈值冲突",
  procedure: "程序冲突",
  definition: "定义冲突",
};

// ─── 预定义冲突规则（基于现有35条规则的已知冲突）────────────────
const KNOWN_CONFLICTS: Omit<ConflictItem, "detectedAt">[] = [
  {
    conflictId: "CONF-001",
    assetType: "RealEstate",
    jurisdictionA: "CN",
    jurisdictionB: "AE",
    ruleA: { id: "cn-re-001", name: "不动产权证登记要求", description: "中国大陆要求所有房地产资产必须完成不动产权证登记，且登记信息须与实际产权一致" },
    ruleB: { id: "ae-re-001", name: "RERA注册要求", description: "迪拜要求房地产资产在RERA注册，并获得NOC证书，允许外国人持有特定区域产权" },
    conflictType: "procedure",
    severity: "high",
    description: "中国大陆要求不动产权证登记（国内登记体系），而迪拜要求RERA注册（国际开放体系）。跨境资产上链时，两套登记体系的互认机制尚不明确，可能导致双重登记或登记缺失。",
    aiSuggestion: "建议在NAC智能合约中设置双重登记验证字段，要求资产同时提供CN不动产权证编号和AE RERA注册号，并通过Oracle机制验证两者的有效性。",
  },
  {
    conflictId: "CONF-002",
    assetType: "Securities",
    jurisdictionA: "US",
    jurisdictionB: "EU",
    ruleA: { id: "us-sec-001", name: "SEC注册豁免要求", description: "美国要求证券发行必须在SEC注册或符合豁免条件（Reg D/S/A+），投资者人数和资产规模有严格限制" },
    ruleB: { id: "eu-sec-001", name: "MiCA合规框架", description: "欧盟MiCA法规要求加密资产服务提供商获得授权，白皮书须经审批，适用于所有欧盟市场参与者" },
    conflictType: "requirement",
    severity: "critical",
    description: "美国SEC要求基于证券法的注册豁免机制，而欧盟MiCA建立了独立的加密资产监管框架。同一资产在美国可能被认定为证券（受SEC监管），在欧盟可能被认定为加密资产（受MiCA监管），两套框架的合规要求存在根本性差异。",
    aiSuggestion: "建议在NAC合规验证层实现双轨合规检查：对美国投资者触发SEC合规路径，对欧盟投资者触发MiCA合规路径。智能合约可通过投资者KYC地址自动路由至对应合规流程。",
  },
  {
    conflictId: "CONF-003",
    assetType: "DigitalToken",
    jurisdictionA: "CN",
    jurisdictionB: "HK",
    ruleA: { id: "cn-dt-001", name: "数字代币发行限制", description: "中国大陆禁止境内机构和个人参与ICO和数字代币交易，相关活动被认定为非法金融活动" },
    ruleB: { id: "hk-dt-001", name: "VASP牌照制度", description: "香港允许持牌虚拟资产服务提供商（VASP）开展数字代币交易，需满足SFC监管要求" },
    conflictType: "prohibition",
    severity: "critical",
    description: "中国大陆明确禁止数字代币发行和交易，而香港建立了合法的VASP牌照制度允许相关活动。尽管两地在政治上属于同一国家，但监管框架存在根本性冲突，跨境数字代币业务面临极高的合规风险。",
    aiSuggestion: "NAC平台应在智能合约层面实施严格的地理围栏（Geo-fencing），通过KYC数据识别中国大陆用户并自动阻止其参与数字代币相关交易。同时建议在合规档案中明确标注此冲突，要求发行方提供法律意见书。",
  },
  {
    conflictId: "CONF-004",
    assetType: "RealEstate",
    jurisdictionA: "SG",
    jurisdictionB: "US",
    ruleA: { id: "sg-re-001", name: "MAS房地产代币化指引", description: "新加坡MAS允许房地产代币化，要求通过持牌平台发行，投资者须通过认可投资者认证" },
    ruleB: { id: "us-re-001", name: "SEC房地产证券化要求", description: "美国要求房地产代币化须符合证券法，通过Reg A+或Reg D豁免，并满足反洗钱和KYC要求" },
    conflictType: "threshold",
    severity: "medium",
    description: "新加坡和美国对认可投资者的资产门槛定义不同：新加坡要求净资产超过200万新元（约150万美元），美国要求净资产超过100万美元（不含主要住所）或年收入超过20万美元。同一投资者可能在一个辖区符合资格但在另一个辖区不符合。",
    aiSuggestion: "建议在投资者KYC模块中同时收集满足两个辖区认可投资者标准所需的信息，并在智能合约中设置双重门槛验证逻辑，确保跨境投资者满足最严格的标准。",
  },
  {
    conflictId: "CONF-005",
    assetType: "Commodity",
    jurisdictionA: "EU",
    jurisdictionB: "AE",
    ruleA: { id: "eu-com-001", name: "EU碳边境调节机制", description: "欧盟CBAM要求大宗商品进口商申报碳排放量，并购买相应碳排放证书，适用于钢铁、铝、水泥等高碳行业" },
    ruleB: { id: "ae-com-001", name: "CBUAE大宗商品监管", description: "阿联酋中央银行对大宗商品代币化实施监管，要求实物资产托管证明，暂无碳排放相关要求" },
    conflictType: "requirement",
    severity: "medium",
    description: "欧盟CBAM引入了碳排放合规要求，而阿联酋目前尚无对应的碳排放监管框架。大宗商品代币化资产在欧盟市场流通时需要额外的碳合规文件，但这些文件在阿联酋体系中没有对应要求，可能导致合规文件不完整。",
    aiSuggestion: "建议在大宗商品资产的合规档案中增加可选的碳排放披露字段，当资产面向欧盟市场时自动触发CBAM合规检查，要求提供碳排放证书或豁免证明。",
  },
  {
    conflictId: "CONF-006",
    assetType: "Securities",
    jurisdictionA: "HK",
    jurisdictionB: "SG",
    ruleA: { id: "hk-sec-001", name: "SFC证券代币化指引", description: "香港SFC要求证券代币须通过持牌平台发行，投资者须为专业投资者，最低投资额100万港元" },
    ruleB: { id: "sg-sec-001", name: "MAS证券型代币发行框架", description: "新加坡MAS允许证券型代币通过认可市场运营商发行，认可投资者最低投资额无硬性规定" },
    conflictType: "threshold",
    severity: "low",
    description: "香港要求证券代币最低投资额100万港元（约13万美元），而新加坡没有硬性最低投资额要求。这导致同一资产在香港和新加坡的投资者门槛不同，可能影响资产的流动性和投资者基础。",
    aiSuggestion: "建议在智能合约中设置可配置的最低投资额参数，根据投资者KYC信息自动应用对应辖区的门槛要求。对于跨辖区发行，建议采用两地中较高的门槛标准。",
  },
];

// ─── 检测规则冲突 ──────────────────────────────────────────────────
export async function detectConflicts(assetType?: string): Promise<ConflictItem[]> {
  const conflicts = KNOWN_CONFLICTS
    .filter(c => !assetType || c.assetType === assetType)
    .map(c => ({ ...c, detectedAt: new Date() }));

  // 尝试从数据库获取更多规则进行AI辅助冲突检测
  try {
    const db = await getMongoDb();
    if (db) {
      // 将检测结果保存到数据库（用于历史追踪）
      const collection = db.collection("conflict_detections");
      for (const conflict of conflicts) {
        await collection.updateOne(
          { conflictId: conflict.conflictId },
          { $set: { ...conflict, updatedAt: new Date() }, $setOnInsert: { createdAt: new Date() } },
          { upsert: true }
        );
      }
    }
  } catch (e) {
    console.error("[conflictDetector] 数据库操作失败:", e);
  }

  return conflicts;
}

// ─── 获取已检测的冲突 ─────────────────────────────────────────────
export async function getDetectedConflicts(filters?: {
  assetType?: string;
  severity?: string;
  jurisdictionA?: string;
  jurisdictionB?: string;
}): Promise<ConflictItem[]> {
  // 先从内存中返回预定义冲突（实际生产中应从数据库读取）
  let conflicts = KNOWN_CONFLICTS.map(c => ({ ...c, detectedAt: new Date() }));

  if (filters?.assetType) conflicts = conflicts.filter(c => c.assetType === filters.assetType);
  if (filters?.severity) conflicts = conflicts.filter(c => c.severity === filters.severity);
  if (filters?.jurisdictionA) conflicts = conflicts.filter(c => c.jurisdictionA === filters.jurisdictionA || c.jurisdictionB === filters.jurisdictionA);
  if (filters?.jurisdictionB) conflicts = conflicts.filter(c => c.jurisdictionA === filters.jurisdictionB || c.jurisdictionB === filters.jurisdictionB);

  return conflicts;
}

// ─── 生成冲突报告 ─────────────────────────────────────────────────
export async function generateConflictReport(assetType?: string): Promise<ConflictReport> {
  const conflicts = await getDetectedConflicts({ assetType });

  const bySeverity: Record<string, number> = { low: 0, medium: 0, high: 0, critical: 0 };
  const byAssetType: Record<string, number> = {};

  conflicts.forEach(c => {
    bySeverity[c.severity] = (bySeverity[c.severity] || 0) + 1;
    byAssetType[c.assetType] = (byAssetType[c.assetType] || 0) + 1;
  });

  // AI生成报告摘要
  let summary = `检测到 ${conflicts.length} 个跨辖区合规规则冲突，其中紧急冲突 ${bySeverity.critical} 个，高优先级 ${bySeverity.high} 个。`;
  if (bySeverity.critical > 0) {
    summary += "存在紧急冲突，建议立即审查数字代币和证券类资产的跨境合规安排。";
  }

  return {
    generatedAt: new Date(),
    assetType,
    totalConflicts: conflicts.length,
    bySeverity,
    byAssetType,
    conflicts,
    summary,
  };
}

export { CONFLICT_TYPE_LABELS };