import { Base64Utils, RandomUtils, StringUtils } from "@imengyu/imengyu-utils";
import { hmacSha1Base64 } from "./hmac";
import type { UploaderAction, UploaderItem } from "@/components/form/Uploader";

const client = {
  region: 'oss-cn-shenzhen',
  accessKeyId: 'LTAI5t5e7wAQ1FvUA4LCsNs5',
  accessKeySecret: 'lhF0SimpatPMHNjmjtIKsWsYwTmJhx',
  bucket: 'minnanwenhua', 
};

function generatePolicyAndSignature(key: string, accessKeySecret: string) {
  try {
    const expiration = new Date(Date.now() + 3600 * 1000).toISOString();
    const policyText = {
      expiration: expiration,
      conditions: [
        ["content-length-range", 0, 10485760 * 256], // 256MB限制
        ["starts-with", "$key", key.substring(0, key.lastIndexOf('/') + 1)]
      ]
    };
    const policyBase64 = Base64Utils.encode(JSON.stringify(policyText));
    const signature = hmacSha1(policyBase64, accessKeySecret);
    return {
      policy: policyBase64,
      signature: signature
    };
  } catch (error) {
    console.error("生成policy和signature失败:", error);
    throw error;
  }
}
function hmacSha1(message: string, key: string) {
  try {
    return hmacSha1Base64(message, key);
  } catch (error) {
    console.error("HMAC-SHA1签名生成失败:", error);
    throw error;
  }
}

function uploadOSS(uploadPath: string, filePath: string, cancelHandler: { cancel: () => void }, onProgress?: (progress: number) => void) {
  return new Promise<string>((resolve, reject) => {

    const key = uploadPath;
    const { policy, signature } = generatePolicyAndSignature(key, client.accessKeySecret);

    const formData = {
      key,
      policy: policy,
      OSSAccessKeyId: client.accessKeyId,
      signature: signature,
      success_action_status: '200'
    };

    const task = uni.uploadFile({
      url: `https://${client.bucket}.${client.region}.aliyuncs.com`,
      filePath,
      name: 'file',
      formData,
      success: res => {
        if (res.statusCode === 200 || res.statusCode === 204) {
          resolve(`https://${client.bucket}.${client.region}.aliyuncs.com/${uploadPath}`)
        } else {
          reject(new Error('上传失败' + res.statusCode))
        }
      },
      fail: reject,
      complete: () => {}
    })
    task.onProgressUpdate(({ progress }) => onProgress?.(progress));

    cancelHandler.cancel = () => {
      task.abort();
    };
  })
}

export function useAliOssUploadCo(
  subPath: string, 
  onFinish?: (res: string, item: UploaderItem) => void
) {
  return (action: UploaderAction) => {
    const name = StringUtils.path.getFileName(action.item.filePath);
    const uploadPath = `${subPath}/${name.split('.')[0]}-${RandomUtils.genNonDuplicateID(6)}.${StringUtils.path.getFileExt(name)}`;  
    const cancelHandler: { cancel: () => void } = {
      cancel: () => {},
    };    
    uploadOSS(uploadPath, action.item.filePath, cancelHandler,(progress) => {
      action.onProgress?.(progress)
    }).then((res) => {  
      action.onFinish?.({
        uploadedUrl: res,
        previewUrl: res,
      }, '上传成功');
      onFinish?.(res, action.item);
    }).catch((err) => {
      action.onError?.(err);
    });
    return () => {
      //取消上传
      cancelHandler.cancel();
    };
  }
}