/**
 * 远程桌面功能 - 作为API模拟的兜底方案
 * 当API模拟失败时，通过远程桌面直接操作电商平台
 */

import { chromium, Browser, Page } from 'playwright';
import { WebSocketServer, WebSocket } from 'ws';
import { createServer } from 'http';
import * as fs from 'fs';
import * as path from 'path';

interface RemoteDesktopConfig {
  port: number;
  headless: boolean;
  proxy?: string;
  screenWidth: number;
  screenHeight: number;
  frameRate: number;
}

interface RemoteSession {
  id: string;
  platform: string;
  page: Page;
  browser: Browser;
  status: 'connected' | 'disconnected' | 'error';
  lastActivity: Date;
  screenStream?: any; // 屏幕流
}

interface RemoteCommand {
  type: 'mouse' | 'keyboard' | 'screenshot' | 'navigate' | 'execute';
  action: string;
  data: any;
}

interface RemoteResponse {
  success: boolean;
  type: string;
  data?: any;
  error?: string;
  timestamp: number;
}

/**
 * 远程桌面服务
 */
export class RemoteDesktopService {
  private config: RemoteDesktopConfig;
  private sessions: Map<string, RemoteSession> = new Map();
  private wss: WebSocketServer;
  private browser: Browser | null = null;

  constructor(config: RemoteDesktopConfig) {
    this.config = config;
    
    // 创建HTTP服务器
    const server = createServer((req, res) => {
      this.handleHttpRequest(req, res);
    });

    // 创建WebSocket服务器
    this.wss = new WebSocketServer({ server });
    server.listen(config.port);

    this.setupWebSocketHandlers();
  }

  /**
   * 设置WebSocket处理器
   */
  private setupWebSocketHandlers(): void {
    this.wss.on('connection', (ws: WebSocket) => {
      console.log('远程桌面客户端连接建立');
      
      ws.on('message', async (data: Buffer) => {
        try {
          const command: RemoteCommand = JSON.parse(data.toString());
          const response = await this.handleRemoteCommand(command, ws);
          ws.send(JSON.stringify(response));
        } catch (error) {
          ws.send(JSON.stringify({
            success: false,
            type: 'error',
            error: error instanceof Error ? error.message : '命令处理失败',
            timestamp: Date.now()
          }));
        }
      });

      ws.on('close', () => {
        console.log('远程桌面客户端连接关闭');
      });
    });
  }

  /**
   * 处理HTTP请求
   */
  private handleHttpRequest(req: any, res: any): void {
    const { url, method } = req;
    
    res.setHeader('Content-Type', 'application/json');
    res.setHeader('Access-Control-Allow-Origin', '*');

    if (url === '/health' && method === 'GET') {
      res.writeHead(200);
      res.end(JSON.stringify({
        status: 'healthy',
        service: 'remote-desktop',
        activeSessions: this.sessions.size,
        timestamp: Date.now()
      }));
    } else if (url === '/sessions' && method === 'GET') {
      res.writeHead(200);
      res.end(JSON.stringify(Array.from(this.sessions.values()).map(session => ({
        id: session.id,
        platform: session.platform,
        status: session.status,
        lastActivity: session.lastActivity
      }))));
    } else {
      res.writeHead(404);
      res.end(JSON.stringify({ error: '接口不存在' }));
    }
  }

  /**
   * 处理远程命令
   */
  private async handleRemoteCommand(command: RemoteCommand, ws: WebSocket): Promise<RemoteResponse> {
    try {
      switch (command.type) {
        case 'navigate':
          return await this.handleNavigateCommand(command);
        case 'mouse':
          return await this.handleMouseCommand(command);
        case 'keyboard':
          return await this.handleKeyboardCommand(command);
        case 'screenshot':
          return await this.handleScreenshotCommand(command);
        case 'execute':
          return await this.handleExecuteCommand(command);
        default:
          return {
            success: false,
            type: 'error',
            error: '未知命令类型',
            timestamp: Date.now()
          };
      }
    } catch (error) {
      return {
        success: false,
        type: 'error',
        error: error instanceof Error ? error.message : '命令执行失败',
        timestamp: Date.now()
      };
    }
  }

  /**
   * 创建远程会话
   */
  async createSession(platform: string): Promise<RemoteSession> {
    if (!this.browser) {
      this.browser = await chromium.launch({
        headless: this.config.headless,
        proxy: this.config.proxy ? { server: this.config.proxy } : undefined,
        args: [
          `--window-size=${this.config.screenWidth},${this.config.screenHeight}`,
          '--disable-web-security',
          '--disable-features=IsolateOrigins,site-per-process'
        ]
      });
    }

    const page = await this.browser.newPage();
    await page.setViewportSize({
      width: this.config.screenWidth,
      height: this.config.screenHeight
    });

    const sessionId = this.generateSessionId();
    const session: RemoteSession = {
      id: sessionId,
      platform,
      page,
      browser: this.browser,
      status: 'connected',
      lastActivity: new Date()
    };

    this.sessions.set(sessionId, session);

    // 设置页面事件监听
    await this.setupPageEventListeners(page, sessionId);

    console.log(`远程会话创建成功: ${sessionId} (${platform})`);
    return session;
  }

  /**
   * 设置页面事件监听器
   */
  private async setupPageEventListeners(page: Page, sessionId: string): Promise<void> {
    // 监听页面导航
    page.on('framenavigated', async (frame) => {
      if (frame === page.mainFrame()) {
        console.log(`会话 ${sessionId} 页面导航: ${frame.url()}`);
      }
    });

    // 监听控制台消息
    page.on('console', (msg) => {
      console.log(`会话 ${sessionId} 控制台:`, msg.text());
    });

    // 监听页面错误
    page.on('pageerror', (error) => {
      console.error(`会话 ${sessionId} 页面错误:`, error);
    });
  }

  /**
   * 处理导航命令
   */
  private async handleNavigateCommand(command: RemoteCommand): Promise<RemoteResponse> {
    const { url, sessionId } = command.data;
    
    const session = this.sessions.get(sessionId);
    if (!session) {
      return {
        success: false,
        type: 'navigate',
        error: '会话不存在',
        timestamp: Date.now()
      };
    }

    try {
      await session.page.goto(url, { waitUntil: 'networkidle' });
      session.lastActivity = new Date();
      
      return {
        success: true,
        type: 'navigate',
        data: {
          message: '页面导航成功',
          url: session.page.url(),
          title: await session.page.title()
        },
        timestamp: Date.now()
      };
    } catch (error) {
      return {
        success: false,
        type: 'navigate',
        error: `页面导航失败: ${error}`,
        timestamp: Date.now()
      };
    }
  }

  /**
   * 处理鼠标命令
   */
  private async handleMouseCommand(command: RemoteCommand): Promise<RemoteResponse> {
    const { sessionId, action, x, y, selector } = command.data;
    
    const session = this.sessions.get(sessionId);
    if (!session) {
      return {
        success: false,
        type: 'mouse',
        error: '会话不存在',
        timestamp: Date.now()
      };
    }

    try {
      switch (action) {
        case 'click':
          if (selector) {
            await session.page.click(selector);
          } else if (x !== undefined && y !== undefined) {
            await session.page.mouse.click(x, y);
          }
          break;
        
        case 'doubleClick':
          if (selector) {
            await session.page.dblclick(selector);
          } else if (x !== undefined && y !== undefined) {
            await session.page.mouse.dblclick(x, y);
          }
          break;
        
        case 'hover':
          if (selector) {
            await session.page.hover(selector);
          } else if (x !== undefined && y !== undefined) {
            await session.page.mouse.move(x, y);
          }
          break;
        
        case 'drag':
          const { startX, startY, endX, endY } = command.data;
          await session.page.mouse.move(startX, startY);
          await session.page.mouse.down();
          await session.page.mouse.move(endX, endY);
          await session.page.mouse.up();
          break;
        
        default:
          return {
            success: false,
            type: 'mouse',
            error: '未知的鼠标操作',
            timestamp: Date.now()
          };
      }
      
      session.lastActivity = new Date();
      
      return {
        success: true,
        type: 'mouse',
        data: { message: '鼠标操作成功' },
        timestamp: Date.now()
      };
    } catch (error) {
      return {
        success: false,
        type: 'mouse',
        error: `鼠标操作失败: ${error}`,
        timestamp: Date.now()
      };
    }
  }

  /**
   * 处理键盘命令
   */
  private async handleKeyboardCommand(command: RemoteCommand): Promise<RemoteResponse> {
    const { sessionId, action, text, selector, key } = command.data;
    
    const session = this.sessions.get(sessionId);
    if (!session) {
      return {
        success: false,
        type: 'keyboard',
        error: '会话不存在',
        timestamp: Date.now()
      };
    }

    try {
      switch (action) {
        case 'type':
          if (selector) {
            await session.page.fill(selector, text);
          } else {
            await session.page.keyboard.type(text);
          }
          break;
        
        case 'press':
          await session.page.keyboard.press(key);
          break;
        
        case 'selectAll':
          await session.page.keyboard.press('Control+A');
          break;
        
        case 'copy':
          await session.page.keyboard.press('Control+C');
          break;
        
        case 'paste':
          await session.page.keyboard.press('Control+V');
          break;
        
        default:
          return {
            success: false,
            type: 'keyboard',
            error: '未知的键盘操作',
            timestamp: Date.now()
          };
      }
      
      session.lastActivity = new Date();
      
      return {
        success: true,
        type: 'keyboard',
        data: { message: '键盘操作成功' },
        timestamp: Date.now()
      };
    } catch (error) {
      return {
        success: false,
        type: 'keyboard',
        error: `键盘操作失败: ${error}`,
        timestamp: Date.now()
      };
    }
  }

  /**
   * 处理截图命令
   */
  private async handleScreenshotCommand(command: RemoteCommand): Promise<RemoteResponse> {
    const { sessionId, fullPage = false } = command.data;
    
    const session = this.sessions.get(sessionId);
    if (!session) {
      return {
        success: false,
        type: 'screenshot',
        error: '会话不存在',
        timestamp: Date.now()
      };
    }

    try {
      const screenshot = await session.page.screenshot({
        fullPage,
        type: 'jpeg',
        quality: 80
      });
      
      session.lastActivity = new Date();
      
      return {
        success: true,
        type: 'screenshot',
        data: {
          message: '截图成功',
          screenshot: screenshot.toString('base64'),
          format: 'base64'
        },
        timestamp: Date.now()
      };
    } catch (error) {
      return {
        success: false,
        type: 'screenshot',
        error: `截图失败: ${error}`,
        timestamp: Date.now()
      };
    }
  }

  /**
   * 处理执行命令
   */
  private async handleExecuteCommand(command: RemoteCommand): Promise<RemoteResponse> {
    const { sessionId, script, args = [] } = command.data;
    
    const session = this.sessions.get(sessionId);
    if (!session) {
      return {
        success: false,
        type: 'execute',
        error: '会话不存在',
        timestamp: Date.now()
      };
    }

    try {
      const result = await session.page.evaluate(({ script, args }) => {
        // 在页面上下文中执行脚本
        return eval(`(${script})`)(...args);
      }, { script, args });
      
      session.lastActivity = new Date();
      
      return {
        success: true,
        type: 'execute',
        data: {
          message: '脚本执行成功',
          result
        },
        timestamp: Date.now()
      };
    } catch (error) {
      return {
        success: false,
        type: 'execute',
        error: `脚本执行失败: ${error}`,
        timestamp: Date.now()
      };
    }
  }

  /**
   * 关闭会话
   */
  async closeSession(sessionId: string): Promise<void> {
    const session = this.sessions.get(sessionId);
    if (session) {
      await session.page.close();
      this.sessions.delete(sessionId);
      console.log(`远程会话已关闭: ${sessionId}`);
    }
  }

  /**
   * 获取会话列表
   */
  getSessions(): RemoteSession[] {
    return Array.from(this.sessions.values());
  }

  /**
   * 启动远程桌面服务
   */
  async start(): Promise<void> {
    console.log(`远程桌面服务启动在端口 ${this.config.port}`);
    console.log(`健康检查: http://localhost:${this.config.port}/health`);
    console.log('等待远程桌面客户端连接...');
  }

  /**
   * 停止远程桌面服务
   */
  async stop(): Promise<void> {
    // 关闭所有会话
    for (const session of this.sessions.values()) {
      await session.page.close();
    }
    this.sessions.clear();
    
    // 关闭浏览器
    if (this.browser) {
      await this.browser.close();
      this.browser = null;
    }
    
    // 关闭WebSocket服务器
    this.wss.close();
    
    console.log('远程桌面服务已停止');
  }

  /**
   * 生成会话ID
   */
  private generateSessionId(): string {
    return `rdp-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
  }
}

// 导出默认配置
export const defaultRemoteDesktopConfig: RemoteDesktopConfig = {
  port: 8081,
  headless: false, // 远程桌面需要显示界面
  screenWidth: 1920,
  screenHeight: 1080,
  frameRate: 30
};

// 导出单例实例
export const remoteDesktopService = new RemoteDesktopService(defaultRemoteDesktopConfig);