GBT gallery downloader (GBTGD)

Creates a button to downloads all images from gallery in a .zip file.
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// ==UserScript==
// @name         GBT gallery downloader (GBTGD)
// @namespace    _pc
// @version      4.9
// @license      MIT
// @description  Creates a button to downloads all images from gallery in a .zip file.
// @author       verydelight
// @match        *://*.gayboystube.com/galleries/*
// @icon         https://www.gayboystube.com/favicon.ico
// @run-at       document-end
// @grant        GM.xmlHttpRequest
// @grant        GM_download
// @grant        GM_xmlHttpRequest
// @grant        GM.download
// @require      https://update.greasyfork.org/scripts/473358/1237031/JSZip.js
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/FileSaver.min.js
// ==/UserScript==
'use strict';
window.onload = function(){
	var zip = new JSZip();
	let button = document.createElement("button");
    let downloadStatus = document.createElement("div");
	button.append("Download Gallery");
	button.setAttribute("type","button");
	button.addEventListener ("click", fullSize, false);
	document.getElementById('tab_video_info').append(button);
	async function downloadFile(url, filename,iCurr,iMax) {
		try {
			const response = await GM.xmlHttpRequest({
				method: 'GET',
				responseType: 'blob',
				url: url,
				headers: {
					"Content-Type": "image/jpeg", "Accept": "image/jpeg"
				},
			});
            //console.log("GBTGD: Downloaded: ",filename,iCurr)
            //console.log("GBTGD: Response Headers; ",response.headers);
			const blob = new Blob([response.response],{type: 'image/jpeg'});
			zip.file(filename, blob, {binary: true})
            //console.log("GBTGD Zip: ", zip,iCurr,iMax)
		} catch (err) {
			console.error("GBTGD: Error in fetching and downloading file: ",iCurr," " , err);
		}
		if(iCurr==iMax-1){
            downloadStatus.innerHTML = "Now creating zip-file and sending for download...";
			await zip.generateAsync({ type: "blob", compression: "DEFLATE", compressionOptions: { level: 6 } }).then(content => saveAs(content, "GBT_gallery"));
            downloadStatus.innerHTML = "Download complete!";
		}
	}
	async function fullSize(){
        button.style.visibility='hidden';
        document.getElementById('tab_video_info').append(downloadStatus);
		var images = document.getElementById('album_view_album_view').getElementsByTagName('img');
		var iMax = images.length;
        var downloadTime = 0;
        var downloadEstimate = 0;
        var downloadEstimateMins = 0;
        var downloadEstimateSecs = 0;
        var counteri = 0;
        //console.log("GBTGD: Found pix: ",iMax)
		for (var i=0, n=images.length;i<n;i++) {
			var currentSrc = images[i].getAttribute('data-src');
			var pattern1 = /\/thumbs/;
			var pattern2 = /\/main\/\d{1,4}x\d{1,4}/;
			if (currentSrc.match(pattern1)) {
				currentSrc = currentSrc.replace(pattern1, '');
			};
			if (currentSrc.match(pattern2)) {
				currentSrc = currentSrc.replace(pattern2, '/sources');
			};
			var fileName = currentSrc.split('/');
			fileName = fileName[fileName.length-1];
            //console.log("GBTGD: Downloading: ",fileName,i)
            counteri = i+1;
            if (downloadTime==0){
                downloadStatus.innerHTML = "Downloading & zipping image "+ counteri +"/"+ iMax;
            }else{
                if (downloadEstimateMins>0) {
                    downloadStatus.innerHTML = "Downloading & zipping image "+ counteri +"/"+ iMax +" (Estimated remaining time: "+ downloadEstimateMins +":"+ downloadEstimateSecs +" minutes)";
                }else{
                    downloadStatus.innerHTML = "Downloading & zipping image "+ counteri +"/"+ iMax +" (Estimated remaining time: "+ downloadEstimateSecs +" seconds)";
                }
            }
			var downloadStart = Date.now();
            await downloadFile(currentSrc,fileName,i,iMax);
            var downloadEnd = Date.now();
            downloadTime += downloadEnd-downloadStart;
            downloadEstimate = Math.round(((((downloadTime/(i+1))*iMax)-downloadTime)/1000)*1.05);
            downloadEstimateMins = Math.floor(downloadEstimate/60);
            downloadEstimateSecs = Math.round(downloadEstimate-(downloadEstimateMins*60));
            downloadEstimateSecs = String(downloadEstimateSecs).padStart(2,"0");
		};
	}
};