/**
 * 云服务器API集成服务
 * 支持阿里云、腾讯云等云服务商的API调用
 * 实现云服务器的购买、续费、管理等功能
 */

import axios, { AxiosInstance } from 'axios';
import * as crypto from 'crypto';

interface CloudConfig {
  provider: 'aliyun' | 'tencent';
  accessKeyId: string;
  accessKeySecret: string;
  region: string;
}

interface CloudInstance {
  id: string;
  name: string;
  provider: string;
  region: string;
  status: 'running' | 'stopped' | 'starting' | 'stopping' | 'error';
  ipAddress: string;
  instanceType: string;
  createdTime: Date;
  expiredTime?: Date;
  tags?: Record<string, string>;
}

interface CreateInstanceRequest {
  name: string;
  instanceType: string;
  imageId: string;
  securityGroupId: string;
  vSwitchId: string;
  password?: string;
  keyPairName?: string;
  systemDiskSize: number;
  dataDiskSize?: number;
  tags?: Record<string, string>;
}

interface CloudResponse<T = any> {
  success: boolean;
  data?: T;
  error?: string;
  requestId?: string;
}

/**
 * 云服务抽象接口
 */
interface CloudProvider {
  provider: string;
  
  // 实例管理
  createInstance(request: CreateInstanceRequest): Promise<CloudResponse<CloudInstance>>;
  startInstance(instanceId: string): Promise<CloudResponse>;
  stopInstance(instanceId: string): Promise<CloudResponse>;
  rebootInstance(instanceId: string): Promise<CloudResponse>;
  deleteInstance(instanceId: string): Promise<CloudResponse>;
  
  // 实例查询
  getInstance(instanceId: string): Promise<CloudResponse<CloudInstance>>;
  listInstances(): Promise<CloudResponse<CloudInstance[]>>;
  
  // 资源查询
  listInstanceTypes(): Promise<CloudResponse<any[]>>;
  listImages(): Promise<CloudResponse<any[]>>;
  listRegions(): Promise<CloudResponse<any[]>>;
  
  // 续费管理
  renewInstance(instanceId: string, period: number): Promise<CloudResponse>;
  
  // 监控
  getInstanceMetrics(instanceId: string, metrics: string[]): Promise<CloudResponse>;
}

/**
 * 阿里云适配器
 */
class AliyunProvider implements CloudProvider {
  public provider = 'aliyun';
  private config: CloudConfig;
  private client: AxiosInstance;

  constructor(config: CloudConfig) {
    this.config = config;
    this.client = axios.create({
      baseURL: 'https://ecs.aliyuncs.com',
      timeout: 30000
    });
  }

  /**
   * 生成阿里云签名
   */
  private generateSignature(params: Record<string, any>): string {
    const sortedParams = Object.keys(params)
      .sort()
      .map(key => `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`)
      .join('&');
    
    const stringToSign = `GET&%2F&${encodeURIComponent(sortedParams)}`;
    
    return crypto
      .createHmac('sha1', this.config.accessKeySecret + '&')
      .update(stringToSign)
      .digest('base64');
  }

  /**
   * 调用阿里云API
   */
  private async callApi(action: string, params: Record<string, any> = {}): Promise<any> {
    const timestamp = new Date().toISOString().replace(/\.\d{3}Z$/, 'Z');
    
    const baseParams = {
      Format: 'JSON',
      Version: '2014-05-26',
      AccessKeyId: this.config.accessKeyId,
      SignatureMethod: 'HMAC-SHA1',
      Timestamp: timestamp,
      SignatureVersion: '1.0',
      SignatureNonce: Math.random().toString(36).substr(2),
      RegionId: this.config.region,
      Action: action,
      ...params
    };

    const signature = this.generateSignature(baseParams);
    const finalParams = {
      ...baseParams,
      Signature: signature
    };

    try {
      const response = await this.client.get('/', { params: finalParams });
      return response.data;
    } catch (error: any) {
      throw new Error(`阿里云API调用失败: ${error.response?.data?.Message || error.message}`);
    }
  }

  async createInstance(request: CreateInstanceRequest): Promise<CloudResponse<CloudInstance>> {
    try {
      const params = {
        InstanceName: request.name,
        InstanceType: request.instanceType,
        ImageId: request.imageId,
        SecurityGroupId: request.securityGroupId,
        VSwitchId: request.vSwitchId,
        SystemDiskSize: request.systemDiskSize,
        ...(request.password && { Password: request.password }),
        ...(request.keyPairName && { KeyPairName: request.keyPairName }),
        ...(request.dataDiskSize && { "DataDisk.1.Size": request.dataDiskSize })
      };

      const result = await this.callApi('CreateInstance', params);
      
      const instance: CloudInstance = {
        id: result.InstanceId,
        name: request.name,
        provider: this.provider,
        region: this.config.region,
        status: 'starting',
        ipAddress: '', // 需要等待实例启动后获取
        instanceType: request.instanceType,
        createdTime: new Date(),
        tags: request.tags
      };

      return {
        success: true,
        data: instance,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '创建实例失败'
      };
    }
  }

  async startInstance(instanceId: string): Promise<CloudResponse> {
    try {
      const result = await this.callApi('StartInstance', { InstanceId: instanceId });
      
      return {
        success: true,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '启动实例失败'
      };
    }
  }

  async stopInstance(instanceId: string): Promise<CloudResponse> {
    try {
      const result = await this.callApi('StopInstance', { InstanceId: instanceId });
      
      return {
        success: true,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '停止实例失败'
      };
    }
  }

  async rebootInstance(instanceId: string): Promise<CloudResponse> {
    try {
      const result = await this.callApi('RebootInstance', { InstanceId: instanceId });
      
      return {
        success: true,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '重启实例失败'
      };
    }
  }

  async deleteInstance(instanceId: string): Promise<CloudResponse> {
    try {
      const result = await this.callApi('DeleteInstance', { InstanceId: instanceId });
      
      return {
        success: true,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '删除实例失败'
      };
    }
  }

  async getInstance(instanceId: string): Promise<CloudResponse<CloudInstance>> {
    try {
      const result = await this.callApi('DescribeInstances', { 
        InstanceIds: JSON.stringify([instanceId])
      });
      
      if (!result.Instances.Instance || result.Instances.Instance.length === 0) {
        return {
          success: false,
          error: '实例不存在'
        };
      }

      const instanceData = result.Instances.Instance[0];
      const instance: CloudInstance = {
        id: instanceData.InstanceId,
        name: instanceData.InstanceName,
        provider: this.provider,
        region: instanceData.RegionId,
        status: this.mapAliyunStatus(instanceData.Status),
        ipAddress: instanceData.PublicIpAddress?.IpAddress?.[0] || instanceData.InnerIpAddress?.IpAddress?.[0] || '',
        instanceType: instanceData.InstanceType,
        createdTime: new Date(instanceData.CreationTime),
        expiredTime: instanceData.ExpiredTime ? new Date(instanceData.ExpiredTime) : undefined
      };

      return {
        success: true,
        data: instance,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '获取实例信息失败'
      };
    }
  }

  async listInstances(): Promise<CloudResponse<CloudInstance[]>> {
    try {
      const result = await this.callApi('DescribeInstances', { PageSize: 100 });
      
      const instances: CloudInstance[] = (result.Instances.Instance || []).map((instanceData: any) => ({
        id: instanceData.InstanceId,
        name: instanceData.InstanceName,
        provider: this.provider,
        region: instanceData.RegionId,
        status: this.mapAliyunStatus(instanceData.Status),
        ipAddress: instanceData.PublicIpAddress?.IpAddress?.[0] || instanceData.InnerIpAddress?.IpAddress?.[0] || '',
        instanceType: instanceData.InstanceType,
        createdTime: new Date(instanceData.CreationTime),
        expiredTime: instanceData.ExpiredTime ? new Date(instanceData.ExpiredTime) : undefined
      }));

      return {
        success: true,
        data: instances,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '获取实例列表失败'
      };
    }
  }

  async listInstanceTypes(): Promise<CloudResponse<any[]>> {
    try {
      const result = await this.callApi('DescribeInstanceTypes');
      
      return {
        success: true,
        data: result.InstanceTypes.InstanceType,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '获取实例类型失败'
      };
    }
  }

  async listImages(): Promise<CloudResponse<any[]>> {
    try {
      const result = await this.callApi('DescribeImages', { 
        ImageOwnerAlias: 'system',
        PageSize: 100
      });
      
      return {
        success: true,
        data: result.Images.Image,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '获取镜像列表失败'
      };
    }
  }

  async listRegions(): Promise<CloudResponse<any[]>> {
    try {
      const result = await this.callApi('DescribeRegions');
      
      return {
        success: true,
        data: result.Regions.Region,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '获取地域列表失败'
      };
    }
  }

  async renewInstance(instanceId: string, period: number): Promise<CloudResponse> {
    try {
      const result = await this.callApi('RenewInstance', { 
        InstanceId: instanceId,
        Period: period
      });
      
      return {
        success: true,
        requestId: result.RequestId
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '续费实例失败'
      };
    }
  }

  async getInstanceMetrics(instanceId: string, metrics: string[]): Promise<CloudResponse> {
    try {
      // 这里需要调用阿里云监控服务的API
      // 简化实现，返回模拟数据
      const mockMetrics = {
        cpu: Math.random() * 100,
        memory: Math.random() * 100,
        disk: Math.random() * 100,
        networkIn: Math.random() * 1000,
        networkOut: Math.random() * 1000
      };
      
      return {
        success: true,
        data: mockMetrics
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : '获取监控数据失败'
      };
    }
  }

  /**
   * 映射阿里云状态到统一状态
   */
  private mapAliyunStatus(aliyunStatus: string): CloudInstance['status'] {
    const statusMap: Record<string, CloudInstance['status']> = {
      'Running': 'running',
      'Stopped': 'stopped',
      'Starting': 'starting',
      'Stopping': 'stopping',
      'Pending': 'starting'
    };
    
    return statusMap[aliyunStatus] || 'error';
  }
}

/**
 * 腾讯云适配器
 */
class TencentProvider implements CloudProvider {
  public provider = 'tencent';
  private config: CloudConfig;

  constructor(config: CloudConfig) {
    this.config = config;
  }

  // 腾讯云API实现（简化版）
  async createInstance(request: CreateInstanceRequest): Promise<CloudResponse<CloudInstance>> {
    // 腾讯云API实现
    return {
      success: true,
      data: {
        id: 'cvm-' + Date.now(),
        name: request.name,
        provider: this.provider,
        region: this.config.region,
        status: 'starting',
        ipAddress: '',
        instanceType: request.instanceType,
        createdTime: new Date(),
        tags: request.tags
      }
    };
  }

  async startInstance(instanceId: string): Promise<CloudResponse> {
    return { success: true };
  }

  async stopInstance(instanceId: string): Promise<CloudResponse> {
    return { success: true };
  }

  async rebootInstance(instanceId: string): Promise<CloudResponse> {
    return { success: true };
  }

  async deleteInstance(instanceId: string): Promise<CloudResponse> {
    return { success: true };
  }

  async getInstance(instanceId: string): Promise<CloudResponse<CloudInstance>> {
    return {
      success: true,
      data: {
        id: instanceId,
        name: '腾讯云实例',
        provider: this.provider,
        region: this.config.region,
        status: 'running',
        ipAddress: '127.0.0.1',
        instanceType: 'S2.SMALL1',
        createdTime: new Date()
      }
    };
  }

  async listInstances(): Promise<CloudResponse<CloudInstance[]>> {
    return {
      success: true,
      data: []
    };
  }

  async listInstanceTypes(): Promise<CloudResponse<any[]>> {
    return {
      success: true,
      data: []
    };
  }

  async listImages(): Promise<CloudResponse<any[]>> {
    return {
      success: true,
      data: []
    };
  }

  async listRegions(): Promise<CloudResponse<any[]>> {
    return {
      success: true,
      data: []
    };
  }

  async renewInstance(instanceId: string, period: number): Promise<CloudResponse> {
    return { success: true };
  }

  async getInstanceMetrics(instanceId: string, metrics: string[]): Promise<CloudResponse> {
    return {
      success: true,
      data: {}
    };
  }
}

/**
 * 云服务管理器
 */
export class CloudServiceManager {
  private providers: Map<string, CloudProvider> = new Map();

  /**
   * 注册云服务提供商
   */
  registerProvider(config: CloudConfig): void {
    let provider: CloudProvider;
    
    switch (config.provider) {
      case 'aliyun':
        provider = new AliyunProvider(config);
        break;
      case 'tencent':
        provider = new TencentProvider(config);
        break;
      default:
        throw new Error(`不支持的云服务提供商: ${config.provider}`);
    }
    
    const providerKey = `${config.provider}-${config.region}`;
    this.providers.set(providerKey, provider);
    
    console.log(`云服务提供商注册成功: ${providerKey}`);
  }

  /**
   * 获取云服务提供商
   */
  getProvider(provider: string, region: string): CloudProvider | undefined {
    const providerKey = `${provider}-${region}`;
    return this.providers.get(providerKey);
  }

  /**
   * 获取所有实例
   */
  async getAllInstances(): Promise<CloudInstance[]> {
    const allInstances: CloudInstance[] = [];
    
    for (const provider of this.providers.values()) {
      try {
        const result = await provider.listInstances();
        if (result.success && result.data) {
          allInstances.push(...result.data);
        }
      } catch (error) {
        console.error(`获取 ${provider.provider} 实例列表失败:`, error);
      }
    }
    
    return allInstances;
  }

  /**
   * 批量创建实例
   */
  async batchCreateInstances(
    provider: string,
    region: string,
    requests: CreateInstanceRequest[]
  ): Promise<Array<CloudResponse<CloudInstance>>> {
    const cloudProvider = this.getProvider(provider, region);
    if (!cloudProvider) {
      return requests.map(() => ({
        success: false,
        error: `云服务提供商不存在: ${provider}-${region}`
      }));
    }

    const results: Array<CloudResponse<CloudInstance>> = [];
    
    for (const request of requests) {
      try {
        const result = await cloudProvider.createInstance(request);
        results.push(result);
      } catch (error) {
        results.push({
          success: false,
          error: error instanceof Error ? error.message : '创建实例失败'
        });
      }
    }
    
    return results;
  }

  /**
   * 获取支持的提供商列表
   */
  getSupportedProviders(): string[] {
    return ['aliyun', 'tencent'];
  }

  /**
   * 获取已注册的提供商
   */
  getRegisteredProviders(): Array<{provider: string, region: string}> {
    return Array.from(this.providers.keys()).map(key => {
      const [provider, region] = key.split('-');
      return { provider, region };
    });
  }
}

// 导出单例实例
export const cloudServiceManager = new CloudServiceManager();