/**
 * 飞书 API 封装 v2 - 使用飞书 SDK
 */

const axios = require('axios');
const fs = require('fs');
const path = require('path');
const https = require('https');
const lark = require('@larksuiteoapi/node-sdk');

// 日志函数
function log(...args) {
  const timestamp = new Date().toISOString();
  console.log(`[${timestamp}] [FeishuAPI]`, ...args);
}

class FeishuAPI {
  constructor() {
    this.appId = process.env.FEISHU_APP_ID;
    this.appSecret = process.env.FEISHU_APP_SECRET;
    this.baseURL = 'https://open.feishu.cn/open-apis';
    this.tokenCache = null;
    this.tokenExpiry = 0;
    
    // 创建飞书 SDK 客户端
    this.client = new lark.Client({
      appId: this.appId,
      appSecret: this.appSecret
    });
  }

  // 获取访问令牌
  async getAccessToken() {
    if (this.tokenCache && Date.now() < this.tokenExpiry) {
      return this.tokenCache;
    }

    try {
      const response = await axios.post(
        `${this.baseURL}/auth/v3/tenant_access_token/internal`,
        {
          app_id: this.appId,
          app_secret: this.appSecret
        },
        {
          headers: { 'Content-Type': 'application/json' }
        }
      );

      const { tenant_access_token, expire } = response.data;
      
      if (response.data.code !== 0) {
        throw new Error(`获取 token 失败：${response.data.msg}`);
      }

      this.tokenCache = tenant_access_token;
      this.tokenExpiry = Date.now() + (expire - 300) * 1000; // 提前 5 分钟过期
      
      return tenant_access_token;
    } catch (error) {
      throw new Error(`飞书 API 错误：${error.message}`);
    }
  }

  // 发送文本消息
  async sendMessage(chatId, payload, receiveIdType = 'chat_id') {
    const token = await this.getAccessToken();
    
    try {
      // 判断 receive_id_type：oc_开头的是 chat_id，ou_开头的是 open_id
      let idType = receiveIdType;
      if (chatId.startsWith('oc_')) {
        idType = 'chat_id';
      } else if (chatId.startsWith('ou_')) {
        idType = 'open_id';
      }
      
      log('发送消息到 chatId:', chatId, 'receive_id_type:', idType, 'msg_type:', payload.msg_type);
      
      const response = await axios.post(
        `${this.baseURL}/im/v1/messages?receive_id_type=${idType}`,
        {
          receive_id: chatId,
          msg_type: payload.msg_type,
          content: typeof payload.content === 'string' ? payload.content : JSON.stringify(payload.content)
        },
        {
          headers: {
            'Authorization': `Bearer ${token}`,
            'Content-Type': 'application/json'
          }
        }
      );

      log('消息发送响应:', response.data.code, response.data.msg || 'ok');

      if (response.data.code !== 0) {
        throw new Error(`发送消息失败：${response.data.msg}`);
      }

      return response.data;
    } catch (error) {
      log('消息发送错误:', error.message);
      throw new Error(`飞书消息发送失败：${error.message}`);
    }
  }

  // 发送卡片消息
  async sendCard(chatId, card) {
    // 判断 receive_id_type
    const receiveIdType = chatId.startsWith('oc_') ? 'chat_id' : 'open_id';
    return this.sendMessage(chatId, {
      msg_type: 'interactive',
      content: JSON.stringify(card)
    }, receiveIdType);
  }

  // 下载文件 - 使用飞书 SDK 的 messageResource API（OpenClaw 使用的方式）
  async downloadFile(fileKey, messageId, chatId) {
    const tempDir = path.join(process.cwd(), 'temp');
    
    if (!fs.existsSync(tempDir)) {
      fs.mkdirSync(tempDir, { recursive: true });
    }

    const tempFile = path.join(tempDir, `feishu_${Date.now()}_${path.basename(fileKey)}`);

    log('下载文件:', fileKey, 'messageId:', messageId);
    
    try {
      // 使用 SDK 的 im.messageResource.get 方法
      const result = await this.client.im.messageResource.get({
        path: {
          message_id: messageId,
          file_key: fileKey
        },
        params: {
          type: 'file'
        }
      });
      
      // SDK 返回一个带有 writeFile 方法的对象
      await result.writeFile(tempFile);
      
      log('文件下载完成:', tempFile, fs.statSync(tempFile).size, 'bytes');
      return tempFile;

    } catch (error) {
      log('下载错误:', error.message);
      throw new Error(`飞书文件下载失败：${error.message}`);
    }
  }

  // 回复消息
  async replyMessage(messageId, payload) {
    const token = await this.getAccessToken();
    
    try {
      const response = await axios.post(
        `${this.baseURL}/im/v1/messages`,
        {
          reply_id: messageId,
          msg_type: payload.msg_type,
          content: payload.content
        },
        {
          headers: {
            'Authorization': `Bearer ${token}`,
            'Content-Type': 'application/json'
          }
        }
      );

      return response.data;
    } catch (error) {
      throw new Error(`飞书回复失败：${error.message}`);
    }
  }
}

module.exports = { FeishuAPI };