/**
 * Playwright MCP Client - MCP客户端封装
 * 
 * 职责：
 * 1. 封装Playwright MCP的底层调用
 * 2. 提供统一的API接口
 * 3. 处理连接、重试、错误
 * 
 * @module testing/tools/mcp-client
 * @version 1.0.0
 */

import { spawn, ChildProcess } from 'child_process';
import type { MCPConfig } from './types';

/**
 * Playwright MCP客户端
 * 
 * 注意：这是一个简化的实现示例
 * 实际使用时需要根据Playwright MCP的实际API进行调整
 */
export class PlaywrightMCPClient {
  private config: MCPConfig;
  private process?: ChildProcess;
  private initialized = false;
  private currentContext?: any;
  private currentPage?: any;

  constructor(config?: MCPConfig) {
    this.config = config || this.getDefaultConfig();
  }

  /**
   * 初始化MCP客户端
   */
  async initialize(): Promise<void> {
    if (this.initialized) {
      console.log('[MCPClient] 已初始化，跳过');
      return;
    }

    console.log('[MCPClient] 初始化MCP客户端...');

    // 启动MCP进程
    this.process = spawn(this.config.command, this.config.args, {
      stdio: ['pipe', 'pipe', 'pipe'],
    });

    this.process.on('error', (error) => {
      console.error('[MCPClient] MCP进程错误:', error);
    });

    this.process.on('exit', (code) => {
      console.log(`[MCPClient] MCP进程退出，代码: ${code}`);
    });

    // TODO: 等待MCP就绪
    await this.waitForReady();

    this.initialized = true;
    console.log('[MCPClient] MCP客户端初始化完成');
  }

  /**
   * 创建浏览器上下文
   */
  async createContext(options: { storageState?: string }): Promise<void> {
    console.log('[MCPClient] 创建浏览器上下文');
    
    // TODO: 实际的MCP调用
    // 这里是模拟实现
    this.currentContext = {
      storageState: options.storageState,
    };
    
    this.currentPage = {
      url: '',
      elements: new Map(),
    };
  }

  /**
   * 导航到URL
   */
  async navigate(url: string, options?: { waitUntil?: string }): Promise<void> {
    console.log(`[MCPClient] 导航到: ${url}`);
    
    // TODO: 实际的MCP调用
    if (this.currentPage) {
      this.currentPage.url = url;
    }
    
    // 模拟等待
    await this.delay(100);
  }

  /**
   * 点击元素
   */
  async click(selector: string, options?: { timeout?: number }): Promise<void> {
    console.log(`[MCPClient] 点击: ${selector}`);
    
    // TODO: 实际的MCP调用
    await this.delay(50);
  }

  /**
   * 填充输入框
   */
  async fill(selector: string, value: string, options?: { timeout?: number }): Promise<void> {
    console.log(`[MCPClient] 填充 ${selector}: ${value}`);
    
    // TODO: 实际的MCP调用
    await this.delay(50);
  }

  /**
   * 选择下拉选项
   */
  async selectOption(selector: string, value: string): Promise<void> {
    console.log(`[MCPClient] 选择 ${selector}: ${value}`);
    
    // TODO: 实际的MCP调用
    await this.delay(50);
  }

  /**
   * 等待选择器
   */
  async waitForSelector(
    selector: string,
    options?: { state?: string; timeout?: number }
  ): Promise<void> {
    console.log(`[MCPClient] 等待选择器: ${selector}`);
    
    // TODO: 实际的MCP调用
    await this.delay(100);
  }

  /**
   * 等待超时
   */
  async waitForTimeout(timeout: number): Promise<void> {
    console.log(`[MCPClient] 等待 ${timeout}ms`);
    await this.delay(timeout);
  }

  /**
   * 悬停
   */
  async hover(selector: string): Promise<void> {
    console.log(`[MCPClient] 悬停: ${selector}`);
    
    // TODO: 实际的MCP调用
    await this.delay(50);
  }

  /**
   * 按键
   */
  async press(selector: string, key: string): Promise<void> {
    console.log(`[MCPClient] 按键 ${key} 在 ${selector}`);
    
    // TODO: 实际的MCP调用
    await this.delay(50);
  }

  /**
   * 获取URL
   */
  async getUrl(): Promise<string> {
    // TODO: 实际的MCP调用
    return this.currentPage?.url || '';
  }

  /**
   * 检查元素是否可见
   */
  async isVisible(selector: string): Promise<boolean> {
    // TODO: 实际的MCP调用
    return true;
  }

  /**
   * 获取文本
   */
  async getText(selector: string): Promise<string> {
    // TODO: 实际的MCP调用
    return 'mock text';
  }

  /**
   * 获取元素数量
   */
  async getCount(selector: string): Promise<number> {
    // TODO: 实际的MCP调用
    return 1;
  }

  /**
   * 获取属性
   */
  async getAttribute(selector: string, attribute: string): Promise<string | null> {
    // TODO: 实际的MCP调用
    return 'mock attribute';
  }

  /**
   * 检查元素是否启用
   */
  async isEnabled(selector: string): Promise<boolean> {
    // TODO: 实际的MCP调用
    return true;
  }

  /**
   * 检查元素是否禁用
   */
  async isDisabled(selector: string): Promise<boolean> {
    // TODO: 实际的MCP调用
    return false;
  }

  /**
   * 截图
   */
  async screenshot(path: string): Promise<void> {
    console.log(`[MCPClient] 截图保存到: ${path}`);
    
    // TODO: 实际的MCP调用
    await this.delay(100);
  }

  /**
   * 保存Trace
   */
  async saveTrace(path: string): Promise<void> {
    console.log(`[MCPClient] Trace保存到: ${path}`);
    
    // TODO: 实际的MCP调用
    await this.delay(100);
  }

  /**
   * 获取视频路径
   */
  async getVideoPath(): Promise<string | null> {
    // TODO: 实际的MCP调用
    return null;
  }

  /**
   * 关闭客户端
   */
  async close(): Promise<void> {
    console.log('[MCPClient] 关闭MCP客户端');
    
    if (this.process) {
      this.process.kill();
      this.process = undefined;
    }
    
    this.initialized = false;
  }

  /**
   * 等待MCP就绪
   */
  private async waitForReady(): Promise<void> {
    // TODO: 实际的就绪检查
    await this.delay(1000);
  }

  /**
   * 延迟工具函数
   */
  private delay(ms: number): Promise<void> {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }

  /**
   * 获取默认配置
   */
  private getDefaultConfig(): MCPConfig {
    return {
      command: 'npx',
      args: [
        '@playwright/mcp@latest',
        '--browser=chromium',
        '--headless',
        '--save-trace',
        '--save-video=1280x720',
        '--save-session',
        '--test-id-attribute=data-testid',
      ],
    };
  }
}