import { DomainEventBus } from '../runtime/DomainEventBus';

// 数据分类
export interface DataClassification {
  id: string;
  name: string;
  description: string;
  sensitivity: 'public' | 'internal' | 'confidential' | 'restricted';
  retentionPeriod: number; // 天数
  createdAt: Date;
  lastUpdated: Date;
}

// 数据访问策略
export interface DataAccessPolicy {
  id: string;
  name: string;
  description: string;
  classificationId: string;
  roles: string[];
  permissions: 'read' | 'write' | 'delete' | 'admin';
  conditions?: string; // 访问条件
  createdAt: Date;
  lastUpdated: Date;
}

// 数据审计日志
export interface DataAuditLog {
  id: string;
  userId: string;
  action: 'read' | 'write' | 'delete' | 'access' | 'export';
  dataClassification: string;
  dataEntity: string;
  recordId?: string;
  ipAddress: string;
  timestamp: Date;
  status: 'success' | 'failed';
  errorMessage?: string;
}

// 数据隐私设置
export interface DataPrivacySetting {
  id: string;
  name: string;
  description: string;
  type: 'anonymization' | 'masking' | 'encryption' | 'retention';
  configuration: Record<string, any>;
  enabled: boolean;
  createdAt: Date;
  lastUpdated: Date;
}

// 数据治理
export class DataGovernance {
  private static instance: DataGovernance;
  private dataClassifications: Map<string, DataClassification> = new Map();
  private accessPolicies: Map<string, DataAccessPolicy> = new Map();
  private auditLogs: Map<string, DataAuditLog> = new Map();
  private privacySettings: Map<string, DataPrivacySetting> = new Map();
  private eventBus: DomainEventBus;

  private constructor() {
    this.eventBus = DomainEventBus.getInstance();
  }

  static getInstance(): DataGovernance {
    if (!DataGovernance.instance) {
      DataGovernance.instance = new DataGovernance();
    }
    return DataGovernance.instance;
  }

  // 创建数据分类
  async createDataClassification(classification: Omit<DataClassification, 'id' | 'createdAt' | 'lastUpdated'>): Promise<DataClassification> {
    const id = `class_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    const newClassification: DataClassification = {
      ...classification,
      id,
      createdAt: new Date(),
      lastUpdated: new Date()
    };

    this.dataClassifications.set(id, newClassification);
    this.eventBus.publish('data.classification.created', newClassification);
    return newClassification;
  }

  // 获取数据分类
  getDataClassification(classificationId: string): DataClassification | undefined {
    return this.dataClassifications.get(classificationId);
  }

  // 获取所有数据分类
  getAllDataClassifications(): DataClassification[] {
    return Array.from(this.dataClassifications.values());
  }

  // 更新数据分类
  async updateDataClassification(classificationId: string, updates: Partial<DataClassification>): Promise<DataClassification | null> {
    const classification = this.dataClassifications.get(classificationId);
    if (!classification) {
      return null;
    }

    const updatedClassification = {
      ...classification,
      ...updates,
      lastUpdated: new Date()
    };

    this.dataClassifications.set(classificationId, updatedClassification);
    this.eventBus.publish('data.classification.updated', updatedClassification);
    return updatedClassification;
  }

  // 创建数据访问策略
  async createAccessPolicy(policy: Omit<DataAccessPolicy, 'id' | 'createdAt' | 'lastUpdated'>): Promise<DataAccessPolicy> {
    const id = `policy_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    const newPolicy: DataAccessPolicy = {
      ...policy,
      id,
      createdAt: new Date(),
      lastUpdated: new Date()
    };

    this.accessPolicies.set(id, newPolicy);
    this.eventBus.publish('data.access.policy.created', newPolicy);
    return newPolicy;
  }

  // 获取数据访问策略
  getAccessPolicy(policyId: string): DataAccessPolicy | undefined {
    return this.accessPolicies.get(policyId);
  }

  // 获取所有数据访问策略
  getAllAccessPolicies(filters?: {
    classificationId?: string;
    role?: string;
    permissions?: string;
  }): DataAccessPolicy[] {
    let result = Array.from(this.accessPolicies.values());

    if (filters) {
      if (filters.classificationId) {
        result = result.filter(p => p.classificationId === filters.classificationId);
      }

      if (filters.role) {
        result = result.filter(p => p.roles.includes(filters.role!));
      }

      if (filters.permissions) {
        result = result.filter(p => p.permissions === filters.permissions);
      }
    }

    return result;
  }

  // 更新数据访问策略
  async updateAccessPolicy(policyId: string, updates: Partial<DataAccessPolicy>): Promise<DataAccessPolicy | null> {
    const policy = this.accessPolicies.get(policyId);
    if (!policy) {
      return null;
    }

    const updatedPolicy = {
      ...policy,
      ...updates,
      lastUpdated: new Date()
    };

    this.accessPolicies.set(policyId, updatedPolicy);
    this.eventBus.publish('data.access.policy.updated', updatedPolicy);
    return updatedPolicy;
  }

  // 检查数据访问权限
  async checkAccessPermission(userId: string, role: string, dataClassification: string, action: 'read' | 'write' | 'delete' | 'admin'): Promise<{
    allowed: boolean;
    policyId?: string;
    reason?: string;
  }> {
    // 这里应该有实际的权限检查逻辑
    // 暂时模拟检查
    await new Promise(resolve => setTimeout(resolve, 100));

    const policies = Array.from(this.accessPolicies.values()).filter(
      p => p.classificationId === dataClassification && p.roles.includes(role)
    );

    if (policies.length === 0) {
      return { allowed: false, reason: 'No policy found for this role and classification' };
    }

    const policy = policies.find(p => {
      switch (action) {
        case 'admin':
          return p.permissions === 'admin';
        case 'delete':
          return p.permissions === 'admin' || p.permissions === 'delete';
        case 'write':
          return p.permissions === 'admin' || p.permissions === 'delete' || p.permissions === 'write';
        case 'read':
          return true;
        default:
          return false;
      }
    });

    if (policy) {
      return { allowed: true, policyId: policy.id };
    } else {
      return { allowed: false, reason: 'Insufficient permissions' };
    }
  }

  // 记录数据审计日志
  async logAuditEvent(log: Omit<DataAuditLog, 'id' | 'timestamp'>): Promise<DataAuditLog> {
    const id = `log_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    const newLog: DataAuditLog = {
      ...log,
      id,
      timestamp: new Date()
    };

    this.auditLogs.set(id, newLog);
    this.eventBus.publish('data.audit.log.created', newLog);
    return newLog;
  }

  // 获取审计日志
  getAuditLog(logId: string): DataAuditLog | undefined {
    return this.auditLogs.get(logId);
  }

  // 获取审计日志
  getAuditLogs(filters?: {
    userId?: string;
    action?: string;
    dataClassification?: string;
    startDate?: Date;
    endDate?: Date;
  }): DataAuditLog[] {
    let result = Array.from(this.auditLogs.values());

    if (filters) {
      if (filters.userId) {
        result = result.filter(l => l.userId === filters.userId);
      }

      if (filters.action) {
        result = result.filter(l => l.action === filters.action);
      }

      if (filters.dataClassification) {
        result = result.filter(l => l.dataClassification === filters.dataClassification);
      }

      if (filters.startDate) {
        result = result.filter(l => l.timestamp >= filters.startDate!);
      }

      if (filters.endDate) {
        result = result.filter(l => l.timestamp <= filters.endDate!);
      }
    }

    return result.sort((a, b) => b.timestamp.getTime() - a.timestamp.getTime());
  }

  // 创建数据隐私设置
  async createPrivacySetting(setting: Omit<DataPrivacySetting, 'id' | 'createdAt' | 'lastUpdated'>): Promise<DataPrivacySetting> {
    const id = `privacy_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    const newSetting: DataPrivacySetting = {
      ...setting,
      id,
      createdAt: new Date(),
      lastUpdated: new Date()
    };

    this.privacySettings.set(id, newSetting);
    this.eventBus.publish('data.privacy.setting.created', newSetting);
    return newSetting;
  }

  // 获取数据隐私设置
  getPrivacySetting(settingId: string): DataPrivacySetting | undefined {
    return this.privacySettings.get(settingId);
  }

  // 获取所有数据隐私设置
  getAllPrivacySettings(filters?: {
    type?: string;
    enabled?: boolean;
  }): DataPrivacySetting[] {
    let result = Array.from(this.privacySettings.values());

    if (filters) {
      if (filters.type) {
        result = result.filter(s => s.type === filters.type);
      }

      if (filters.enabled !== undefined) {
        result = result.filter(s => s.enabled === filters.enabled);
      }
    }

    return result;
  }

  // 更新数据隐私设置
  async updatePrivacySetting(settingId: string, updates: Partial<DataPrivacySetting>): Promise<DataPrivacySetting | null> {
    const setting = this.privacySettings.get(settingId);
    if (!setting) {
      return null;
    }

    const updatedSetting = {
      ...setting,
      ...updates,
      lastUpdated: new Date()
    };

    this.privacySettings.set(settingId, updatedSetting);
    this.eventBus.publish('data.privacy.setting.updated', updatedSetting);
    return updatedSetting;
  }

  // 启用/禁用数据隐私设置
  async togglePrivacySetting(settingId: string, enabled: boolean): Promise<boolean> {
    const setting = this.privacySettings.get(settingId);
    if (!setting) {
      return false;
    }

    setting.enabled = enabled;
    setting.lastUpdated = new Date();
    this.privacySettings.set(settingId, setting);
    this.eventBus.publish('data.privacy.setting.toggled', setting);
    return true;
  }

  // 应用数据隐私处理
  async applyPrivacyTreatment(data: any, classificationId: string): Promise<any> {
    // 这里应该有实际的隐私处理逻辑
    // 暂时模拟处理
    await new Promise(resolve => setTimeout(resolve, 500));

    const classification = this.dataClassifications.get(classificationId);
    if (!classification) {
      return data;
    }

    // 根据数据分类应用不同的隐私处理
    switch (classification.sensitivity) {
      case 'restricted':
        // 应用最严格的隐私处理
        return this.maskSensitiveData(data);
      case 'confidential':
        // 应用中等隐私处理
        return this.anonymizeData(data);
      case 'internal':
        // 应用轻度隐私处理
        return this.removePII(data);
      case 'public':
      default:
        // 无需处理
        return data;
    }
  }

  // 掩码敏感数据
  private maskSensitiveData(data: any): any {
    // 这里应该有实际的掩码逻辑
    return { ...data, masked: true };
  }

  // 匿名化数据
  private anonymizeData(data: any): any {
    // 这里应该有实际的匿名化逻辑
    return { ...data, anonymized: true };
  }

  // 移除个人身份信息
  private removePII(data: any): any {
    // 这里应该有实际的PII移除逻辑
    return { ...data, piiRemoved: true };
  }

  // 生成数据治理报告
  async generateGovernanceReport(): Promise<{
    summary: {
      totalClassifications: number;
      totalPolicies: number;
      totalAuditLogs: number;
      totalPrivacySettings: number;
    };
    classifications: DataClassification[];
    policies: DataAccessPolicy[];
    recentAuditLogs: DataAuditLog[];
    privacySettings: DataPrivacySetting[];
  }> {
    const classifications = Array.from(this.dataClassifications.values());
    const policies = Array.from(this.accessPolicies.values());
    const auditLogs = Array.from(this.auditLogs.values()).sort((a, b) => b.timestamp.getTime() - a.timestamp.getTime()).slice(0, 100);
    const privacySettings = Array.from(this.privacySettings.values());

    return {
      summary: {
        totalClassifications: classifications.length,
        totalPolicies: policies.length,
        totalAuditLogs: this.auditLogs.size,
        totalPrivacySettings: privacySettings.length
      },
      classifications,
      policies,
      recentAuditLogs: auditLogs,
      privacySettings
    };
  }

  // 获取数据治理统计信息
  getGovernanceStats(): {
    totalClassifications: number;
    totalPolicies: number;
    totalAuditLogs: number;
    totalPrivacySettings: number;
    enabledPrivacySettings: number;
    auditLogsToday: number;
  } {
    const today = new Date();
    today.setHours(0, 0, 0, 0);

    const auditLogsToday = Array.from(this.auditLogs.values())
      .filter(log => log.timestamp >= today)
      .length;

    const enabledPrivacySettings = Array.from(this.privacySettings.values())
      .filter(setting => setting.enabled)
      .length;

    return {
      totalClassifications: this.dataClassifications.size,
      totalPolicies: this.accessPolicies.size,
      totalAuditLogs: this.auditLogs.size,
      totalPrivacySettings: this.privacySettings.size,
      enabledPrivacySettings,
      auditLogsToday
    };
  }
}
