GPT gallery downloader (GPTGD)

Creates a button to download all images from gallery in a single .zip file.
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// ==UserScript==
// @name         GPT gallery downloader (GPTGD)
// @namespace    _pc
// @version      5.37
// @license      MIT
// @description  Creates a button to download all images from gallery in a single .zip file.
// @author       verydelight
// @match        *://*.gayporntube.com/galleries/*
// @connect      gayporntube.com
// @connect      gayboystube.com
// @icon         https://www.gayporntube.com/favicon.ico
// @run-at       document-start
// @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';
document.addEventListener("DOMContentLoaded", function() {
	const zip = new JSZip();
	const button = document.createElement("button");
	const downloadStatus = document.createElement("div");
	const progressElement = document.createElement("progress");
	const zipFileName = document.querySelector('h1.title').innerText
	.replace(/[^a-zA-Z0-9-_ ]/g, '')
	.replace(/\s+/g, ' ')
	.substring(0, 245)
	.replace(/^_+|_+$/g, '')
	.trim();
	const finalZipFileName = `GPT ${zipFileName}`;
	progressElement.id = "progress";
	progressElement.setAttribute("value",0);
	progressElement.setAttribute("max",100);
	progressElement.style.width = "100%";
	button.textContent = "Download Gallery";
	button.type = "button";
	button.classList.add('bttn');
	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"
				},
			});
			const blob = new Blob([response.response],{type: 'image/jpeg'});
			zip.file(filename, blob, {binary: true})
		} catch (err) {
			console.error("GPTGD: Error in fetching and downloading file: ",iCurr," " , err);
		}
		if(iCurr==iMax-1){
			downloadStatus.innerHTML = "Now zipping images, creating zip-file and sending for download. Please wait...";
			const content = await zip.generateAsync({ type: "blob", compression: "DEFLATE", compressionOptions: { level: 6 } });
			saveAs(content, finalZipFileName);
			downloadStatus.innerHTML = "Download complete!";
		}
	}
	async function fullSize() {
		button.style.visibility = 'hidden';
		document.getElementById('tab_video_info').append(downloadStatus);
		document.getElementById('tab_video_info').append(progressElement);
        const images = document.querySelectorAll('#album_view_album_view > #tab5 img')
		const iMax = images.length;
		let downloadTime = 0;
		let downloadEstimate = 0;
		let downloadTimeFull = 0;
		let downloadPercent = 0;
		const pattern1 = /\/thumbs/;
		const pattern2 = /\/main\/\d{1,4}x\d{1,4}/;
		for (let i = 0; i < iMax; i++) {
			const timeRemaining = downloadEstimate > 0 ? formatTime(downloadEstimate) : '';
			downloadStatus.innerHTML = `Downloading image ${i + 1}/${iMax}${timeRemaining ? ` (ca.: ${timeRemaining} remaining)` : ''}`;
			const currentSrc = images[i].getAttribute('data-src').replace(pattern1, '').replace(pattern2, '/sources');
			const fileName = currentSrc.split('/').pop();
			const downloadStart = Date.now();
			await downloadFile(currentSrc, fileName, i, iMax);
			const downloadEnd = Date.now();
			downloadTime += downloadEnd - downloadStart;
			const averageTimePerFile = downloadTime / (i + 1);
			downloadEstimate = Math.round((averageTimePerFile * iMax - downloadTime) / 1000);
			const downloadTimeFull = Math.round(averageTimePerFile * iMax);
			const downloadPercent = Math.round((downloadTime / downloadTimeFull) * 100);
			progressElement.setAttribute("value", downloadPercent);
		}
	}
	function formatTime(seconds) {
		const minutes = Math.floor(seconds / 60);
		const secs = seconds % 60;
		const formattedMinutes = minutes > 0 ? (minutes < 10 ? "0" + minutes : minutes) : "00";
		const formattedSeconds = secs < 10 ? "0" + secs : secs;
		return minutes > 0 ? `${formattedMinutes}:${formattedSeconds} minutes` : `${formattedSeconds} seconds`;
	}
});