const axios = require('axios');
const logger = require('../../../shared/logger');

/**
 * YesCaptcha API 封装
 * 支持 hCaptcha、reCaptcha、Turnstile 等验证码识别
 */
class YesCaptchaAPI {
  constructor() {
    this.apiKey = process.env.YESCAPTCHA_API_KEY;
    this.apiUrl = 'https://api.yescaptcha.com';
  }

  /**
   * 识别 hCaptcha
   * @param {string} siteKey - 网站的 sitekey
   * @param {string} pageUrl - 网页 URL
   * @param {object} options - 可选参数 {isInvisible, rqdata, userAgent}
   * @returns {Promise<string>} - hCaptcha token
   */
  async solveHCaptcha(siteKey, pageUrl, options = {}) {
    if (!this.apiKey) {
      throw new Error('YesCaptcha API Key 未配置');
    }

    logger.info('YesCaptcha', '开始识别 hCaptcha...');
    logger.info('YesCaptcha', `SiteKey: ${siteKey.substring(0, 20)}...`);
    
    try {
      // 1. 创建任务
      const requestBody = {
        clientKey: this.apiKey,
        task: {
          type: 'HCaptchaTaskProxyless',
          websiteURL: pageUrl,
          websiteKey: siteKey
        }
      };

      // 添加可选参数
      if (options.isInvisible !== undefined) {
        requestBody.task.isInvisible = options.isInvisible;
      }
      if (options.rqdata) {
        requestBody.task.rqdata = options.rqdata;
      }
      if (options.userAgent) {
        requestBody.task.userAgent = options.userAgent;
      }
      
      logger.info('YesCaptcha', `请求 URL: ${pageUrl}`);
      logger.info('YesCaptcha', `API Key: ${this.apiKey.substring(0, 10)}...`);
      
      const createTaskResponse = await axios.post(`${this.apiUrl}/createTask`, requestBody);
      
      if (createTaskResponse.data.errorId !== 0) {
        logger.error('YesCaptcha', `API 返回错误: ${JSON.stringify(createTaskResponse.data)}`);
        throw new Error(`创建任务失败: ${createTaskResponse.data.errorDescription}`);
      }
      
      const taskId = createTaskResponse.data.taskId;
      logger.info('YesCaptcha', `任务已创建，TaskID: ${taskId}`);
      
      // 2. 轮询获取结果（最多等待120秒）
      const maxAttempts = 40; // 120秒 / 3秒
      let attempts = 0;
      
      while (attempts < maxAttempts) {
        attempts++;
        
        // 等待3秒再查询
        await new Promise(resolve => setTimeout(resolve, 3000));
        
        logger.info('YesCaptcha', `查询结果... (${attempts}/${maxAttempts})`);
        
        const getResultResponse = await axios.post(`${this.apiUrl}/getTaskResult`, {
          clientKey: this.apiKey,
          taskId: taskId
        });
        
        if (getResultResponse.data.errorId !== 0) {
          throw new Error(`查询结果失败: ${getResultResponse.data.errorDescription}`);
        }
        
        const status = getResultResponse.data.status;
        
        if (status === 'ready') {
          const token = getResultResponse.data.solution.gRecaptchaResponse;
          logger.success('YesCaptcha', `✓ 识别成功！耗时: ${attempts * 3}秒`);
          
          // 返回 userAgent 如果有的话
          if (getResultResponse.data.solution.userAgent) {
            logger.info('YesCaptcha', `返回的 UserAgent: ${getResultResponse.data.solution.userAgent.substring(0, 50)}...`);
          }
          
          return token;
        } else if (status === 'processing') {
          // 继续等待
          continue;
        } else {
          throw new Error(`未知状态: ${status}`);
        }
      }
      
      throw new Error('识别超时（120秒）');
      
    } catch (error) {
      // 详细的错误日志
      if (error.response) {
        // API 返回了错误响应
        logger.error('YesCaptcha', `HTTP ${error.response.status}: ${error.response.statusText}`);
        logger.error('YesCaptcha', `响应数据: ${JSON.stringify(error.response.data)}`);
        
        if (error.response.status === 400) {
          logger.error('YesCaptcha', '可能原因：');
          logger.error('YesCaptcha', '  1. API Key 无效或已过期');
          logger.error('YesCaptcha', '  2. 余额不足');
          logger.error('YesCaptcha', '  3. siteKey 或 URL 格式错误');
        }
      } else if (error.request) {
        // 请求已发送但没有收到响应
        logger.error('YesCaptcha', '无法连接到 YesCaptcha API');
      } else {
        // 其他错误
        logger.error('YesCaptcha', `识别失败: ${error.message}`);
      }
      throw error;
    }
  }
}

module.exports = YesCaptchaAPI;