import axios from 'axios';
import FileSaver from 'file-saver';
import errorCode from '@/utils/errorCode';
import { blobValidate } from '@/utils/common';
import { LoadingInstance } from 'element-plus/es/components/loading/src/loading';
import { globalHeaders } from '@/utils/request';

const baseURL = import.meta.env.VITE_APP_BASE_API;
let downloadLoadingInstance: LoadingInstance;
export default {
    async ossUrl(url: string) {
        downloadLoadingInstance = ElLoading.service({ text: '正在下载数据，请稍候', background: 'rgba(0, 0, 0, 0.7)' });
        try {
            const res = await axios({
                method: 'get',
                url: url,
                responseType: 'blob',
                headers: globalHeaders()
            });
            const isBlob = blobValidate(res.data);
            if (isBlob) {
                const blob = new Blob([res.data], { type: 'application/octet-stream' });
                FileSaver.saveAs(blob, decodeURIComponent(res.headers['download-filename'] as string));
            } else {
                this.printErrMsg(res.data);
            }
            downloadLoadingInstance.close();
        } catch (r) {
            console.error(r);
            ElMessage.error('下载文件出现错误，请联系管理员！');
            downloadLoadingInstance.close();
        }
    },
  async oss(ossId: string | number) {
    const url = baseURL + '/resource/oss/download/' + ossId;
    downloadLoadingInstance = ElLoading.service({ text: '正在下载数据，请稍候', background: 'rgba(0, 0, 0, 0.7)' });
    try {
      const res = await axios({
        method: 'get',
        url: url,
        responseType: 'blob',
        headers: globalHeaders()
      });
      const isBlob = blobValidate(res.data);
      if (isBlob) {
        const blob = new Blob([res.data], { type: 'application/octet-stream' });
        FileSaver.saveAs(blob, decodeURIComponent(res.headers['download-filename'] as string));
      } else {
        this.printErrMsg(res.data);
      }
      downloadLoadingInstance.close();
    } catch (r) {
      console.error(r);
      ElMessage.error('下载文件出现错误，请联系管理员！');
      downloadLoadingInstance.close();
    }
  },
  async zip(url: string, name: string) {
    url = baseURL + url;
    downloadLoadingInstance = ElLoading.service({ text: '正在下载数据，请稍候', background: 'rgba(0, 0, 0, 0.7)' });
    try {
      const res = await axios({
        method: 'get',
        url: url,
        responseType: 'blob',
        headers: globalHeaders()
      });
      const isBlob = blobValidate(res.data);
      if (isBlob) {
        const blob = new Blob([res.data], { type: 'application/zip' });
        FileSaver.saveAs(blob, name);
      } else {
        this.printErrMsg(res.data);
      }
      downloadLoadingInstance.close();
    } catch (r) {
      console.error(r);
      ElMessage.error('下载文件出现错误，请联系管理员！');
      downloadLoadingInstance.close();
    }
  },
  async printErrMsg(data: any) {
    const resText = await data.text();
    const rspObj = JSON.parse(resText);
    const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode['default'];
    ElMessage.error(errMsg);
  },
  async download(type: string, data: any) {
    try{
        let fileName = ''
        let temp = data.headers["content-disposition"]
        var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
        var matches = filenameRegex.exec(temp);
        if(matches != null && matches[1]) {
            fileName = matches[1].replace(/['"]/g, '').trim();
        }
        let a = document.createElement("a");
        a.download = decodeURI(fileName);
        a.style.display = "none";
        let blob = new Blob([data.data], { type: "application/vnd.ms-excel" });
        a.href = URL.createObjectURL(blob);
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        ElMessage.success((type == 'export' ? '导出' : '下载') + '成功')
    }catch{
        ElMessage.error((type == 'export' ? '导出' : '下载') + '失败，请稍后再试')
    }
  }
};
