import { DomainEventBus } from '../runtime/DomainEventBus';
import { ServiceRegistry } from '../orchestrator/ServiceRegistry';
import { ServiceOrchestrator } from '../orchestrator/ServiceOrchestrator';

// 服务治理规则
export interface GovernanceRule {
  id: string;
  name: string;
  description: string;
  type: 'performance' | 'security' | 'compliance' | 'availability';
  severity: 'low' | 'medium' | 'high' | 'critical';
  condition: string; // 规则条件
  action: 'alert' | 'block' | 'auto-fix';
  createdAt: Date;
  lastUpdated: Date;
  enabled: boolean;
}

// 服务治理事件
export interface GovernanceEvent {
  id: string;
  serviceId: string;
  ruleId: string;
  severity: 'low' | 'medium' | 'high' | 'critical';
  message: string;
  timestamp: Date;
  status: 'open' | 'resolved' | 'ignored';
  metadata?: Record<string, any>;
}

// 服务配额
export interface ServiceQuota {
  serviceId: string;
  maxRequestsPerSecond: number;
  maxConcurrentRequests: number;
  maxMemoryUsage: number; // MB
  maxCpuUsage: number; // %
  createdAt: Date;
  lastUpdated: Date;
}

// 服务治理
export class ServiceGovernance {
  private static instance: ServiceGovernance;
  private rules: Map<string, GovernanceRule> = new Map();
  private events: Map<string, GovernanceEvent> = new Map();
  private quotas: Map<string, ServiceQuota> = new Map();
  private serviceRegistry: ServiceRegistry;
  private serviceOrchestrator: ServiceOrchestrator;
  private eventBus: DomainEventBus;

  private constructor() {
    this.serviceRegistry = ServiceRegistry.getInstance();
    this.serviceOrchestrator = ServiceOrchestrator.getInstance();
    this.eventBus = DomainEventBus.getInstance();
  }

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

  // 创建治理规则
  async createRule(rule: Omit<GovernanceRule, 'id' | 'createdAt' | 'lastUpdated'>): Promise<GovernanceRule> {
    const id = `rule_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    const newRule: GovernanceRule = {
      ...rule,
      id,
      createdAt: new Date(),
      lastUpdated: new Date()
    };

    this.rules.set(id, newRule);
    this.eventBus.publish('governance.rule.created', newRule);
    return newRule;
  }

  // 获取规则信息
  getRule(ruleId: string): GovernanceRule | undefined {
    return this.rules.get(ruleId);
  }

  // 获取所有规则
  getAllRules(filters?: {
    type?: string;
    severity?: string;
    enabled?: boolean;
  }): GovernanceRule[] {
    let result = Array.from(this.rules.values());

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

      if (filters.severity) {
        result = result.filter(r => r.severity === filters.severity);
      }

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

    return result;
  }

  // 更新规则
  async updateRule(ruleId: string, updates: Partial<GovernanceRule>): Promise<GovernanceRule | null> {
    const rule = this.rules.get(ruleId);
    if (!rule) {
      return null;
    }

    const updatedRule = {
      ...rule,
      ...updates,
      lastUpdated: new Date()
    };

    this.rules.set(ruleId, updatedRule);
    this.eventBus.publish('governance.rule.updated', updatedRule);
    return updatedRule;
  }

  // 启用/禁用规则
  async toggleRule(ruleId: string, enabled: boolean): Promise<boolean> {
    const rule = this.rules.get(ruleId);
    if (!rule) {
      return false;
    }

    rule.enabled = enabled;
    rule.lastUpdated = new Date();
    this.rules.set(ruleId, rule);
    this.eventBus.publish('governance.rule.toggled', rule);
    return true;
  }

  // 删除规则
  async deleteRule(ruleId: string): Promise<boolean> {
    const rule = this.rules.get(ruleId);
    if (!rule) {
      return false;
    }

    this.rules.delete(ruleId);
    this.eventBus.publish('governance.rule.deleted', rule);
    return true;
  }

  // 创建治理事件
  async createEvent(event: Omit<GovernanceEvent, 'id' | 'timestamp' | 'status'>): Promise<GovernanceEvent> {
    const id = `event_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    
    const newEvent: GovernanceEvent = {
      ...event,
      id,
      timestamp: new Date(),
      status: 'open'
    };

    this.events.set(id, newEvent);
    this.eventBus.publish('governance.event.created', newEvent);
    return newEvent;
  }

  // 获取事件信息
  getEvent(eventId: string): GovernanceEvent | undefined {
    return this.events.get(eventId);
  }

  // 获取所有事件
  getAllEvents(filters?: {
    serviceId?: string;
    ruleId?: string;
    severity?: string;
    status?: string;
    startDate?: Date;
    endDate?: Date;
  }): GovernanceEvent[] {
    let result = Array.from(this.events.values());

    if (filters) {
      if (filters.serviceId) {
        result = result.filter(e => e.serviceId === filters.serviceId);
      }

      if (filters.ruleId) {
        result = result.filter(e => e.ruleId === filters.ruleId);
      }

      if (filters.severity) {
        result = result.filter(e => e.severity === filters.severity);
      }

      if (filters.status) {
        result = result.filter(e => e.status === filters.status);
      }

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

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

    return result;
  }

  // 解决事件
  async resolveEvent(eventId: string, resolution: string): Promise<boolean> {
    const event = this.events.get(eventId);
    if (!event) {
      return false;
    }

    event.status = 'resolved';
    event.metadata = {
      ...event.metadata,
      resolution
    };
    this.events.set(eventId, event);
    this.eventBus.publish('governance.event.resolved', event);
    return true;
  }

  // 忽略事件
  async ignoreEvent(eventId: string, reason: string): Promise<boolean> {
    const event = this.events.get(eventId);
    if (!event) {
      return false;
    }

    event.status = 'ignored';
    event.metadata = {
      ...event.metadata,
      ignoreReason: reason
    };
    this.events.set(eventId, event);
    this.eventBus.publish('governance.event.ignored', event);
    return true;
  }

  // 设置服务配额
  async setServiceQuota(quota: Omit<ServiceQuota, 'createdAt' | 'lastUpdated'>): Promise<ServiceQuota> {
    const existingQuota = this.quotas.get(quota.serviceId);
    
    const newQuota: ServiceQuota = {
      ...quota,
      createdAt: existingQuota?.createdAt || new Date(),
      lastUpdated: new Date()
    };

    this.quotas.set(quota.serviceId, newQuota);
    this.eventBus.publish('governance.quota.set', newQuota);
    return newQuota;
  }

  // 获取服务配额
  getServiceQuota(serviceId: string): ServiceQuota | undefined {
    return this.quotas.get(serviceId);
  }

  // 获取所有服务配额
  getAllServiceQuotas(): ServiceQuota[] {
    return Array.from(this.quotas.values());
  }

  // 检查服务是否符合治理规则
  async checkServiceCompliance(serviceId: string): Promise<{
    compliant: boolean;
    violations: GovernanceEvent[];
  }> {
    const service = this.serviceRegistry.getService(serviceId);
    if (!service) {
      throw new Error('Service not found');
    }

    const violations: GovernanceEvent[] = [];
    const enabledRules = this.getAllRules({ enabled: true });

    for (const rule of enabledRules) {
      // 这里应该有实际的规则检查逻辑
      // 暂时模拟检查
      const isViolation = Math.random() < 0.1; // 10% 概率违反规则
      
      if (isViolation) {
        const violation = await this.createEvent({
          serviceId,
          ruleId: rule.id,
          severity: rule.severity,
          message: `Service ${serviceId} violates rule ${rule.name}`
        });
        violations.push(violation);
      }
    }

    return {
      compliant: violations.length === 0,
      violations
    };
  }

  // 执行服务治理检查
  async runGovernanceCheck(): Promise<{
    totalServices: number;
    compliantServices: number;
    violations: GovernanceEvent[];
  }> {
    const services = this.serviceRegistry.getAllServices();
    const violations: GovernanceEvent[] = [];
    let compliantCount = 0;

    for (const service of services) {
      const result = await this.checkServiceCompliance(service.id);
      if (result.compliant) {
        compliantCount++;
      } else {
        violations.push(...result.violations);
      }
    }

    return {
      totalServices: services.length,
      compliantServices: compliantCount,
      violations
    };
  }

  // 获取治理统计信息
  getGovernanceStats(): {
    totalRules: number;
    enabledRules: number;
    totalEvents: number;
    openEvents: number;
    resolvedEvents: number;
    ignoredEvents: number;
    compliantServices: number;
    totalServices: number;
  } {
    const totalServices = this.serviceRegistry.getAllServices().length;
    const compliantServices = 0; // 这里应该计算实际的合规服务数量

    return {
      totalRules: this.rules.size,
      enabledRules: Array.from(this.rules.values()).filter(r => r.enabled).length,
      totalEvents: this.events.size,
      openEvents: Array.from(this.events.values()).filter(e => e.status === 'open').length,
      resolvedEvents: Array.from(this.events.values()).filter(e => e.status === 'resolved').length,
      ignoredEvents: Array.from(this.events.values()).filter(e => e.status === 'ignored').length,
      compliantServices,
      totalServices
    };
  }
}
