// 七牛云服务模块 - ESM 格式
import qiniu from "qiniu";

/**
 * 生成七牛云上传凭证
 * @param {Object} qiniuData - 七牛云配置信息
 * @param {string} qiniuData.ak - AccessKey
 * @param {string} qiniuData.sk - SecretKey
 * @param {string} qiniuData.bucket - 存储空间名称
 * @param {string} qiniuData.domain - 访问域名
 * @param {string} qiniuData.zoneUrl - 上传区域地址
 * @param {string} qiniuData.zone - 存储区域（如 z2）
 * @param {number} qiniuData.max_file_size - 最大文件大小（MB）
 * @returns {Promise<Object>} 返回上传凭证信息
 */
export function qiniuUptoken(qiniuData) {
  return new Promise((resolve) => {
    const accessKey = qiniuData.ak;
    const secretKey = qiniuData.sk;
    const max_file_size = qiniuData.max_file_size || 400;

    const options = {
      scope: qiniuData.bucket // scope = <bucket>:<key>,key可省略
    };

    const mac = new qiniu.auth.digest.Mac(accessKey, secretKey);
    const config = new qiniu.conf.Config();

    // 设置空间对应的机房
    if (qiniuData.zone === "z2") {
      config.zone = qiniu.zone.Zone_z2;
    }

    // 参考文档: http://developer.qiniu.com/article/developer/security/put-policy.html
    const putPolicy = new qiniu.rs.PutPolicy(options);
    // putPolicy.expires = "3600" // 默认token一小时内生效
    // putPolicy.mimeLimit = "image/*" // image/*表示只允许上传图片类型

    resolve({
      uptoken: putPolicy.uploadToken(mac),
      domain: qiniuData.domain,
      zoneUrl: qiniuData.zoneUrl,
      max_file_size: max_file_size
    });
  });
}