rahulkapoor90/VITacademics-Enhancement-Suite

var script =
`
    console.log("started");
    jQuery ? console.log("Yes") : console.log("No");
    var res ;
    var count = 0;
    var links = [];
    var dZip = function(){

        var Promise = window.Promise;
        if (!Promise) {        Promise = JSZip.external.Promise;    }

        function urlToPromise(url) {
            return new Promise(function(resolve, reject) {
                JSZipUtils.getBinaryContent(url, function (err, data) {
                    if(err) {
                        reject(err);
                    } else {
                        resolve(data);
                    }
                });
            });
        }

        var zip = new JSZip();

        function fetchFile(url){

            fetch(url, {"credentials" : "include"})
            .then(function (response) {
                if (response.status === 200 || response.status === 0) {
                    res = response;
                    return Promise.resolve({ data : response.arrayBuffer(), name : response.headers.get("Content-Disposition").split(";")[1].split("Filename=")[1] })
                } else {
                    return Promise.reject(new Error(response.statusText))
                }
            })
            .then(function(val){
                zip.file(val.name, val.data);//.async("string");
                count++;
                if(count==links.length){
                    count=0;
                    downloadZIP();
                }
            });

        }

        links.forEach(function(e){
            fetchFile(e);
        })

           // when everything has been downloaded, we can trigger the dl
        function downloadZIP(){

            zip.generateAsync({type:"blob"})
            .then(function callback(blob) {

                // see FileSaver.js
                saveAs(blob, "Material.zip");

                console.log("done !");
            }, function (e) {
                console.error(e);
            });

        }

    }

    var b=\`<tr>
    <td bgcolor="#5A768D" width="22%" height="30"><font color="#FFFFFF">Download All Zip</font></td>
              <td width="75" bgcolor="#EDEADE">  <input class="submit" type="submit" value="Download All Zip"> </td>
    </tr>\`
    b=$(b);
    $('table:nth-of-type(2)').find('tbody').prepend(b);
    $('input[name="downloadSelect"]').each(function(i, val){links.push($(val).attr('value'))});
    $(b).find('input:submit').click(dZip);
`;
function init(){
    var sJSZip = document.createElement('script');
    sJSZip.src = chrome.extension.getURL("scripts/zip/fileSaver.min.js");
    var sJSZipUtils = document.createElement('script');
    sJSZipUtils.src = chrome.extension.getURL("scripts/zip/jszip-utils.min.js");
    var sfileSaver = document.createElement('script');
    sfileSaver.src = chrome.extension.getURL("scripts/zip/jszip.js");
    var sjquery = document.createElement('script');
    sjquery.src = chrome.extension.getURL("scripts/jquery.min.js");
    var sZip = document.createElement('script');
    sZip.textContent = script;

    var s = (document.head||document.documentElement).appendChild(sjquery);
    (document.head||document.documentElement).appendChild(sJSZip);
    (document.head||document.documentElement).appendChild(sJSZipUtils);
    (document.head||document.documentElement).appendChild(sfileSaver);
    s.onload = function() {
        (document.head||document.documentElement).appendChild(sZip);
    }

}

onload = init();