module.exports = {
  main: async (event) => {
    let { data = {}, userInfo } = event;
    const COZE_TOKEN = 'sat_OiXlI4Da5Q99fxmul6pNfExmA6hR898UbxBDwrvjZ638APxRSlFnXbz6zyFedKNG';
    const BOT_ID = '7689821072762011698';

    let fileId = data.file_id;

    // 模式1：只上传文件（选文件时调用）
    if (data.upload_only && data.file_base64) {
      const fileBuffer = Buffer.from(data.file_base64, 'base64');
      const boundary = '----FormBoundary' + Date.now();
      const header = Buffer.from(
        '--' + boundary + '\r\n' +
        'Content-Disposition: form-data; name="file"; filename="' + (data.file_name || 'file') + '"\r\n' +
        'Content-Type: application/octet-stream\r\n\r\n'
      );
      const footer = Buffer.from('\r\n--' + boundary + '--\r\n');
      const uploadBody = Buffer.concat([header, fileBuffer, footer]);

      try {
        const uploadRes = await uniCloud.httpclient.request('https://api.coze.cn/v1/files/upload', {
          method: 'POST',
          dataType: 'json',
          headers: {
            'Authorization': 'Bearer ' + COZE_TOKEN,
            'Content-Type': 'multipart/form-data; boundary=' + boundary,
            'Content-Length': uploadBody.length.toString()
          },
          content: uploadBody,
          timeout: 60000
        });
        if (uploadRes.data.code !== 0) {
          return { code: -1, msg: '文件上传失败: ' + uploadRes.data.msg };
        }
        fileId = uploadRes.data.data.id;
        return { code: 0, msg: 'ok', data: { file_id: fileId } };
      } catch (e) {
        return { code: -1, msg: '上传异常: ' + e.message };
      }
    }

    // 模式2：发起审查（不等结果，立即返回 chat_id）
    if (!fileId) {
      return { code: -1, msg: '缺少 file_id' };
    }

    const objectString = JSON.stringify([
      { type: 'file', file_id: fileId },
      { type: 'text', text: '请审查这份合同' }
    ]);

    try {
      const chatRes = await uniCloud.httpclient.request('https://api.coze.cn/v3/chat', {
        method: 'POST',
        dataType: 'json',
        contentType: 'json',
        timeout: 30000,
        headers: { 'Authorization': 'Bearer ' + COZE_TOKEN },
        data: {
          bot_id: BOT_ID,
          user_id: (userInfo && userInfo.uid) || 'anonymous',
          stream: false,
          auto_save_history: true,
          additional_messages: [{
            role: 'user',
            content: objectString,
            content_type: 'object_string'
          }]
        }
      });

      const chatData = chatRes.data && chatRes.data.data;
      return {
        code: 0, msg: 'ok',
        data: {
          chat_id: chatData && chatData.id,
          conversation_id: chatData && chatData.conversation_id
        }
      };
    } catch (e) {
      return { code: -1, msg: '审查发起失败: ' + e.message };
    }
  }
};